Emerson Fisher 627 Series User manual

W4793
!
!
627 Series Pressure Reducing Regulators
WARNING
WARNING
Failure to follow these instructions or to
properly install and maintain this equipment
could result in an explosion and/or fire
causing property damage and personal injury
or death.
Fisher™ regulators must be installed,
operated and maintained in accordance
with federal, state and local codes, rules
and regulations, and Emerson Process
Management Regulator Technologies,
Inc. instructions.
If the regulator vents gas or a leak develops
in the system, service to the unit may be
required. Failure to correct trouble could
result in a hazardous condition.
Call a gas service person to service the
unit. Only a qualified person must install or
service the regulator.
Introduction
Scope of the Manual
This manual provides instructions for the installation,
adjustment, maintenance and parts ordering information
for the 627 Series regulators. These regulators are usually
shipped separate for line installation, although sometimes
they are shipped installed on other equipment. Refer to the
Instruction Manual of the other equipment for installation and
operating instructions.
Description
The 627 Series direct-operated pressure reducing regulators
(Figure 1) are for high and low pressure systems. These
regulators can be used with natural gas, air or a variety of
other gases. Performance characteristics vary according
to construction.
Personal injury, property damage, equipment
damage or leakage due to escaping gas or
bursting of pressure-containing parts may
result if this regulator is overpressured or
is installed where service conditions could
exceed the limits given in the Specifications
section, Tables 1, 2, 3 and 4 or where
conditions exceed any ratings of the adjacent
piping or piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices (as required by the appropriate code,
regulation or standard) to prevent service
conditions from exceeding those limits.
The Type 627R, 627LR or 627MR regulator
with internal relief will provide downstream
overpressure protection within the limits
given in the Specifications section, Tables 1,
2, 3 and 4. If these limits are exceeded,
additional downstream overpressure
protection must be provided by the user.
Additionally, physical damage to the regulator
could cause personal injury or property
damage due to escaping gas. To avoid such
injury or damage, install the regulator in a
safe location.
Figure 1. Typical 627 Direct-Operated
Pressure Reducing Regulator
627 Series
Instruction Manual
D101328X012
March 2020

Specifications
The Specifications section gives some general specifications for the 627 Series regulators. The nameplates give detailed
information for a particular regulator as it comes from the factory.
Available Constructions
Type 627: Direct-operated pressure reducing regulator
equipped with a pitot tube for greater regulated
capacities (Figure 7).
Type 627R: Type 627 with internal relief and with an
open throat (Figure 8).
Type 627LR: Type 627R with light rate relief spring
(Figure 9).
Type 627M: Type 627 with a stem seal between the
body outlet pressure and diaphragm case. Pressure is
measured under the diaphragm through the 1/4 NPT
downstream control line connection (Figure 10).
Type 627MR: Type 627M with internal relief (Figure 11).
Type 627H: Type 627 with a diaphragm limiter to deliver
a higher outlet pressure (Figure 12).
Type 627HM: Type 627H with a stem seal between the
body outlet pressure and diaphragm case. Pressure is
measured under the diaphragm through the 1/4 NPT
downstream control line connection (Figure 13).
Type 627OSX: Type 627 with Type OS2 slam shut
device for overpressure protection. Available with Over
and Under Pressure Trip points. (Figure 14)
Body Sizes and End Connection Styles
Maximum Inlet Pressure(1) (Body Rating)
Flanged Stainless Steel: 1440 psig / 99.3 bar
NPT Stainless Steel: 2000 psig / 138 bar
Flanged Steel: 1500 psig / 103 bar
NPT Steel: 2000 psig / 138 bar
NPT Steel (Type 627OSX):
1500 psig / 138 bar
Ductile Iron: 1000 psig / 69.0 bar
Maximum Valve Disk Inlet Pressure Rating(1)
Nylon (PA) Disk: 2000 psig / 138 bar
Nitrile (NBR) Disk: 1000 psig / 69.0 bar
Fluorocarbon (FKM) Disk: 300 psig / 20.7 bar
Maximum Operating Inlet Pressure, Pressure Differential
and Outlet Pressure Ranges(1)
See Table 1 for pressures by orifice size and
spring range
Maximum Spring and Diaphragm Casing Pressure(1)
See Table 2
Maximum Body Outlet Pressure(1)(2)
Types 627M, 627MR and 627HM only
NPT Steel: 2000 psig / 138 bar
Flanged Steel: 1500 psig / 103 bar
Ductile Iron: 1000 psig / 69.0 bar
Type 627OSX
NPT Steel: 1500 psig / 103 bar
Orifice Sizes
See Table 1
Internal Relief Performance
Type 627R: See Table 3
Type 627LR: See Table 4
Type 627MR: Limited by field-installed control
line piping
Elastomer Temperature Capabilities(1)(3)
Flow Coefficients
See Table 5
IEC Sizing Coefficients
See Table 6
Pressure Registration
Type 627, 627H, 627R, 627LR, 627OSX or 627HOSX:
Internal
Type 627M, 627HM, 627MR, 627MOSX or 627HMOSX:
External through 1/4 NPT control line connection in the
diaphragm casing
BODY SIZE END CONNECTION STYLE CONSTRUCTION
AVAILABLE
NPS DN
3/4 - - - - NPT
All
1 25 NPT, CL150 RF, CL300 RF,
CL600 RF and Long Body
1-1/4 32 NPT
2 50 NPT, CL150 RF, CL300 RF,
CL600 RF and Long Body
MATERIAL DISK/
DIAPHRAGM
TEMPERATURE
°F °C
Nitrile (NBR) Disk -40 to 180 -40 to 82
Diaphragm
Fluorocarbon (FKM) Disk 0 to 180 -18 to 82
Diaphragm
Nylon (PA) Disk -40 to 180 -40 to 82
Neoprene (CR) for
Types 627H and 627HM only Diaphragm -40 to 180 -40 to 82
Nitrile (NBR) for Types 627OSX
and 627MOSX only
Disk -20 to 180 -29 to 82
Diaphragm
Neoprene (CR) for
Types 627HOSX and
627HMOSX only
Diaphragm -20 to 180 -29 to 82
1. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.
2. Types 627, 627H, 627R,627LR and 627OSX are limited by maximum diaphragm casing pressure.
3. Stainless steel body is rated to -40°F / -40°C. Steel and Ductile Iron bodies are rated to -20°F / -29°C.
2
627 Series

Specifications (continued)
De-Icer System
See Figure 3 and Type 627M Regulator De-Icer
System Application section
Relief Indicator
For Types 627R, 627LR and 627MR
(see Figures 8, 9 and 11)
Spring Case Vent Connection
3/4 NPT with removable screened vent assembly
Approximate Weights
627 Series
Ductile Iron, Steel or Stainless steel Casings:
10 lbs / 5 kg
Aluminum Casing: 6.3 lbs / 3 kg
Type 627OSX
NPS 1 / DN 25: 40 lbs / 18 kg
NPS 2 / DN 50: 42 lbs / 19 kg
Principle of Operation
Refer to Figure 2. When downstream demand decreases,
the pressure under the diaphragm increases. This pressure
overcomes the regulator setting (which is set by a spring).
Through the action of the pusher post assembly, lever
and valve stem the valve disk moves closer to the orifice
and reduces gas flow. If demand downstream increases,
pressure under the diaphragm decreases. Spring force
pushes the pusher post assembly downward and the valve
disk moves away from the orifice.
Product Description
Types 627 and 627H Direct-Operated Pressure Reducing
Regulators—The Types 627 and 627H regulators provide
economical pressure reducing control for a variety of
residential, commercial and industrial applications. The
regulator pitot tube located in a high velocity stream provides
dynamic boost that compensates for outlet pressure drop.
Type 627 Long Body—The Type 627 Long Body regulator
can be used as a drop-in replacement for existing Type 630
installations without the need to modify piping.
Internal Relief for Type 627R, 627LR or 627MR
Regulator—The Type 627R internal relief performance
values were obtained by removing the disk assembly
from the regulator. For the Type 627R, 627LR or 627MR
regulator, the internal relief across the diaphragm provides
overpressure protection in many applications. As outlet
pressures build up above the start-to-discharge point, the
diaphragm moves off the relief valve seat allowing the
excess pressure to bleed out through the screened vent.
For extra protection, should failure conditions exist which
would prevent normal operation of the regulator (for
example, disk broken off or disk erosion), the pusher
post contacts the lever retainer causing the relief valve
assembly to open. Since the diaphragm continues to rise
as downstream pressure builds, it opens the relief valve;
thereby, opening the valve. This internal relief may be
adequate for the application.
Downstream Control Line for Type 627M, 627HM, 627MR,
627MOSX or 627HMOSX Regulator—A Type 627M,
627HM, 627MR, 627MOSX or 627HMOSX regulator has a
blocking throat stem seal with O-rings and a 1/4 NPT control
line connection in the diaphragm case. A regulator with a
downstream control line is used for monitoring applications
or other applications where other equipment is installed
between the regulator and the pressure control point. The
stem seal separates the body outlet pressure from the
diaphragm case.
Type 627OSX— The Type 627OSX regulator with integral
slam-shut device can provide either overpressure (OPSO)
or overpressure (OPSO) and underpressure (UPSO)
protection by completely shutting off the flow of gas to the
downstream system.
Installation
Regulator operation within ratings does not preclude
the possibility of damage from debris in the lines or from
external sources. A regulator should be inspected for
damage periodically and after any overpressure condition.
Key numbers referenced in this section are shown in
Figures 7 through 13. Ensure that the operating temperature
capabilities listed in Specifications section are not exceeded.
Note
If the regulator is shipped mounted on
another unit, install that unit according to the
appropriate Instruction Manual.
Perform steps 1 through 6 for all types of regulators:
1. Only personnel qualified through training and
experience should install, operate or maintain
this regulator.
2. For a regulator that is shipped separately, make
sure that there is no damage to or foreign material in
the regulator.
3. Ensure that all tubing and piping have been blown free
of foreign debris.
4. The regulator may be installed in any position as long as
the flow through the body is in the direction indicated by
the arrow cast on the body.
3
627 Series

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
!
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
A6557
Type 627OSX must be installed in a horizontal position
and the mechanism box must be above or below the
body. It is recommended to install vents upstream and
downstream of the regulator between the shutoff valves.
Pipe supports should be used for flanged Type 627OSX
units due to weight.
See Type OS2 Instruction Manual (D102778X012) for
additional information.
5. If continuous operation is required during inspection
or maintenance, install a three-valve bypass around
the regulator.
A regulator may vent some gas to the
atmosphere. In hazardous or flammable gas
service, vented gas may accumulate and
cause personal injury, death or property
damage due to fire or explosion. Vent a
regulator in hazardous gas service to a
remote, safe location away from air intakes
or any hazardous area. The vent line or
stack opening must be protected against
condensation or clogging.
6. Position the body (key 1) and/or diaphragm spring case
(key 29) so it will not collect moisture or debris into the
screened vent. If the regulator requires repositioning,
refer to the Body Area Maintenance Procedures and/or
the Diaphragm and Spring Case Area Maintenance
Procedures in the Maintenance section to reposition the
screened vent for the application.
Perform steps 7 through 9 for Types 627M, 627HM,
627MR, 627MOSX and 627HMOSX regulators only:
7. A Type 627M, 627HM, 627MR, 627MOSX or
627HMOSX regulator requires a downstream control
line. Install the control line before putting the regulator
into operation.
8. Ensure that the downstream control line piping is at
least 3/8 in. / 9.5 mm or larger outside diameter tubing
and connected to a straight section of outlet piping 10
diameters downstream of the regulator.
9. A hand valve should be installed in the control line. This
hand valve can be used to throttle down and dampen
outlet pulsations in control pressure which may cause
instability or cycling of the regulator.
Remote Vent Line Installation
All 627 Series regulators have a vent assembly installed in the
3/4 NPT spring case vent opening. The vent assembly can be
removed to install a remote vent line if necessary. Remote vent
lines must have the largest practical diameter. It should be as
short as possible with minimum number of bends or elbows.
Protect the remote vent opening against entrance of rain,
snow or any other foreign material that may plug the vent
or vent line and prevent proper operation of the regulator.
Periodically check the vent opening to be sure it is not
plugged with foreign debris.
Figure 2. Type 627 Operational Schematic
ADJUSTING SCREW
DIAPHRAGM
PUSHER POST
LEVER ORIFICE
VALVE DISK
STEM
CONTROL SPRING
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
WARNING
4
627 Series

Table 1. Maximum Inlet Pressures and Outlet Pressure Ranges
TYPE
OUTLET PRESSURE
RANGE, SPRING
PART NUMBER AND
COLOR CODE
ORIFICE SIZE MAXIMUM INLET PRESSURE(1)
Nylon (PA) Disk(2) Nitrile (NBR) Disk Fluorocarbon (FKM) Disk
In. mm psig bar psig bar psig bar
627,
627M
and
627OSX(4)
5(3) to 20 psig /
0.34 to 1.4 bar
10B3076X012
Yellow
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
1000
750
500
300
250
138
69.0
51.7
34.5
20.7
17.2
1000
1000
750
500
300
250
69.0
69.0
51.7
34.5
20.7
17.2
300
300
300
300
300
250
20.7
20.7
20.7
20.7
20.7
17.2
15 to 40 psig /
1.0 to 2.8 bar
10B3077X012
Green
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
1500
1000
750
500
300
138
103
69.0
51.7
34.5
20.7
1000
1000
1000
750
500
300
69.0
69.0
69.0
51.7
34.5
20.7
300
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
20.7
35 to 80 psig /
2.4 to 5.5 bar
10B3078X012
Blue
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
2000
1750
1500
1000
750
138
138
121
103
69.0
51.7
1000
1000
1000
1000
1000
750
69.0
69.0
69.0
69.0
69.0
51.7
300
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
20.7
70 to 150 psig /
4.8 to 10.3 bar
10B3079X012
Red
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
2000
2000
1750
1250
750
138
138
138
121
86.2
51.7
1000
1000
1000
1000
1000
750
69.0
69.0
69.0
69.0
69.0
51.7
300
300
300
300
300
300
20.7
20.7
20.7
20.7
20.7
20.7
627R
and
627MR
5(2) to 20 psig /
0.34 to 1.4 bar
10B3076X012
Yellow
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
1000
750
500
300
200
138
69.0
51.7
34.5
20.7
13.8
1000
1000
750
500
300
200
69.0
69.0
51.7
34.5
20.7
13.8
300
300
300
300
300
200
20.7
20.7
20.7
20.7
20.7
13.8
15 to 40 psig /
1.0 to 2.8 bar
10B3077X012
Green
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
1500
1000
750
300
200
138
103
69.0
51.7
20.7
13.8
1000
1000
1000
750
300
200
69.0
69.0
69.0
51.7
20.7
13.8
300
300
300
300
300
200
20.7
20.7
20.7
20.7
20.7
13.8
35 to 80 psig /
2.4 to 5.5 bar
10B3078X012
Blue
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
1750
1000
750
300
200
138
121
69.0
51.7
20.7
13.8
1000
1000
1000
750
300
200
69.0
69.0
69.0
51.7
20.7
13.8
300
300
300
300
300
200
20.7
20.7
20.7
20.7
20.7
13.8
70 to 150 psig /
4.8 to 10.3 bar
10B3079X012
Red
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
1000
500
300
200
200
138
69.0
34.5
20.7
13.8
13.8
1000
1000
500
300
200
200
69.0
69.0
34.5
20.7
13.8
13.8
300
300
300
300
200
200
20.7
20.7
20.7
20.7
13.8
13.8
627LR
15 to 40 psig /
1.0 to 2.8 bar
10B3077X012
Green
3/32
1/8
3/16
1/4
2.4
3.2
4.8
6.4
1000
1000
750
500
69.0
69.0
51.7
34.5
300
300
300
300
20.7
20.7
20.7
20.7
627H,
627HM
and
627HOSX(4)
140 to 250 psig /
9.7 to 17.2 bar
10B3078X012
Blue
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
2000
1750
1500
1000
750
138
138
121
103
69.0
51.7
1000
1000
1000
1000
750
500
69.0
69.0
69.0
69.0
51.7
34.5
240 to 500 psig /
16.5 to 34.5 bar
10B3079X012
Red
3/32
1/8
3/16
1/4
3/8
1/2
2.4
3.2
4.8
6.4
9.5
13
2000
2000
1750
1500
1000
750
138
138
121
103
69.0
51.7
1000
1000
1000
1000
1000
750
69.0
69.0
69.0
69.0
69.0
51.7
- Shaded areas indicate that Fluorocarbon (FKM) and Nylon (PA) disk material are not available.
1. For inlet pressure in excess of 1000 psig / 69.0 bar, refer to the maximum body and disk pressure ratings in the Specications section.
2. Maximum inlet pressure for Type 627OSX is limited to 1500 psi / 103 bar.
3. For pressure settings under 10 psig / 0.69 bar, inlet pressure should be limited to approximately 100 psig / 6.9 bar so the setpoint adjustment can be obtained.
4. The unbalance forces change from the wide-open monitor mode to an active regulator mode such that the Type 627M or 627HM should have a 3/8 in. / 9.5 mm or larger orice.
5
627 Series

!
Table 2. Maximum Spring and Diaphragm Casing Pressure(1)
MAXIMUM PRESSURE DESCRIPTION DIAPHRAGM
CASING MATERIAL
TYPES 627
AND 627OSX
TYPES 627R
AND 627LR
TYPES 627M
AND
627MOSX
TYPE 627MR
TYPES 627H,
627HM,
627HOSX
AND
627HMOSX
psig bar psig bar psig bar psig bar psig bar
Maximum pressure to spring and diaphragm
casings to prevent leak to atmosphere other than
relief action (internal parts damage may occur)
Die cast aluminum
250 17.2 250 17.2
Not Available Not Available Not Available
Ductile iron 250 17.2
Steel or Stainless steel 250 17.2 800 55.2
Maximum pressure to spring and diaphragm
casings to prevent burst of casings during
abnormal operation (leak to atmosphere and
internal parts damage may occur)
Die cast aluminum 375 25.9 375 25.9 Not Available Not Available Not Available
Ductile iron 465 32.1 465 32.1 465 32.1 465 32.1
Steel or Stainless steel 1500 103 1500 103 1500 103 1500 103 1500 103
Maximum diaphragm casing overpressure (above
setpoint) to prevent damage to internal parts All materials 60 4.1 120 8.3 60 4.1 120 8.3 120 8.3
1. If the spring case is pressurized, a metal adjusting screw cap is required. Contact your local Sales O󰀩ce for details.
Type 627M or 627HM Regulator
De-Icer System Application
For the Type 627M or 627HM regulator de-icer system,
refer to the application shown in Figure 3. With a large
pressure drop across the working regulator, ice can form
within this regulator. The formation of ice decreases the
size of the orifice, so the regulator is unable to supply
enough flow to satisfy the downstream demand. When the
downstream pressure falls below the outlet pressure setting
of the Type 627M or 627HM regulator, the disk assembly
of the Type 627M or 627HM regulator moves off its orifice,
permitting alcohol to flow into the main gas line. The alcohol
carried to the main regulator by the flowstream prevents
additional ice from forming on the orifice. When normal
flow resumes and as pressure in the downstream system is
restored, the Type 627M or 627HM regulator shuts off.
Overpressure Protection
627 Series regulators have outlet pressure ratings that are
lower than their inlet pressure ratings. A pressure-relieving
or pressure-limiting device must be provided by the user for
the Types 627, 627H, 627M and 627HM regulators if the inlet
pressure can exceed the outlet pressure rating, since these
regulators do not have internal relief.
Types 627R and 627LR regulators provide internal relief
which limits the total outlet pressure buildup over setpoint.
Use Tables 3 and 4 to determine the total outlet pressure.
This internal relief may be adequate for the application, if
not, provide additional pressure relief or a pressure-limiting
device downstream.
Types 627OSX utilizes integral slam-shut device to provide
overpressure and underpressure protection by completely
shutting off the flow of gas to the downstream system.
Pressure is registered on one side of the diaphragm, piston
or bellows and is opposed by the setpoint control spring of
the manometric sensing device. The Type OS2 slam-shut
valve tripping pressure is determined by the setting of the
control spring.
WARNING
Overpressure–When the downstream pressure increases
above the setpoint, the pressure on top of the diaphragm
overcomes the spring setting and moves the manometric
device stem.
Underpressure–When the downstream pressure decreases
below the setpoint, the control spring pressure below the
diaphragm overcomes the downstream pressure and pushes
the diaphragm which moves the manometric device stem.
See Type OS2 Instruction Manual (D102778X012) for
additional information.
Startup and Adjustment
Startup
To avoid personal injury or property damage
due to explosion or damage to regulator or
downstream components during startup,
release downstream pressure to prevent an
overpressure condition on the diaphragm of
the regulator.
In order to avoid an overpressure condition
and possible equipment damage, pressure
gauges should always be used to monitor
pressures during startup.
1. Slowly open the upstream shut-off valve.
2. Slowly open the downstream shut-off valve.
3. Check all connections for leaks.
4. Make final control spring adjustments according to the
adjustment procedures.
6
627 Series

A3725
!
NEEDLE
VALVE
WORKING REGULATOR
CONTROL LINE
TYPE 627M SET LOWER
THAN WORKING REGULATOR
GRAVITY FEED
ALCOHOL DRIP POT
VENT VALVE
INLET
EQUALIZING LINE
HAND
VALVE
Figure 3. De-Icer System Operational Schematic
WARNING
Adjustment
The range of allowable pressure settings is marked on
the nameplate. If a pressure setting beyond this range
is necessary, substitute the appropriate regulator control
spring. Change the nameplate to indicate the new
pressure range.
Before increasing the setting, refer to Table 1, 2, 3 or 4.
Review the pressure limits for the control spring range being
used and be certain that the new pressure setting will not
result in an overpressure condition.
Note
Always use a pressure gauge to monitor
pressure when making adjustments.
Refer to Figures 7 through 13 for key number locations.
1. Remove the adjusting screw cap (key 36).
2. Loosen the locknut (key 34).
3. Increase the outlet pressure setting by turning the
adjusting screw (key 35) clockwise. Decrease the
outlet pressure setting by turning the adjusting
screw counterclockwise.
4. When the desired pressure is obtained, hold the
adjusting screw (key 35) in place and tighten the locknut
(key 34).
Refer to Type OS2 Instruction Manual (D102778X012) for
instructions on adjusting the slam-shut.
Shutdown
To avoid personal injury or property damage
due to explosion or damage to regulator or
downstream components during shutdown,
release downstream pressure to prevent an
overpressure condition on the diaphragm of
the regulator.
1. Close the nearest upstream shut-off valve.
2. Close the nearest downstream shut-off valve.
3. Open the vent valve between the regulator and the
downstream shut-off valve nearest to it.
4. For a Type 627, 627H, 627R or 627LR regulator, the
regulator will open to release pressure between the
upstream shut-off valve and the regulator.
5. A Type 627M, 627HM or 627MR regulator requires
venting the control line and downstream pressure
from the regulator before maintenance. The pressure
between these shut-off valves is released through
the open regulator because the disk assembly
remains open in response to the decrease in control
line pressure.
6. Type 627OSX with underpressure protection may
trip and trap gas upstream of the regulator. It is
recommended to also open an upstream vent to allow
gas to escape.
7
627 Series

!
Table 3. Type 627R Internal Relief Performance(1)
OUTLET PRESSURE
RANGE, SPRING
PART NUMBER AND
COLOR CODE
OUTLET
PRESSURE
SETTING
MAXIMUM
ALLOWABLE
DOWNSTREAM
SYSTEM
PRESSURE
MAXIMUM INLET PRESSURE TO KEEP MAXIMUM ALLOWABLE DOWNSTREAM
SYSTEM PRESSURE FROM BEING EXCEEDED(2)
Orice Size, In. / mm
3/32 / 2.4 1/8 / 3.2 3/16 / 4.8 1/4 / 6.4 3/8 / 9.5 1/2 / 13
psig bar psig bar psig bar psig bar psig bar psig bar psig bar psig bar
5(3) to 20 psig /
0.34 to 1.4 bar
10B3076X012
Yellow
10 0.69
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
1250
2000
2000
2000
2000
2000
86.2
138
138
138
138
138
740
1500
1900
2000
2000
2000
51.0
103
131
138
138
138
320
620
830
1100
1300
1600
22.1
42.7
57.2
75.8
89.6
110
190
390
480
670
770
960
13.1
26.9
33.1
46.2
53.1
66.2
95
180
220
320
360
450
6.6
12.4
15.2
22.1
24.8
31.0
75 130
160
220
260
320
5.2
9.0
11.0
15.2
17.9
22.1
15 1.0
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
1000
2000
2000
2000
2000
2000
69.0
138
138
138
138
138
620
1400
1900
2000
2000
2000
42.7
96.5
131
138
138
138
260
610
810
1100
1300
1600
17.9
42.1
55.8
75.8
89.6
110
170
370
480
670
770
960
11.7
25.5
33.1
46.2
53.1
66.2
90
170
220
320
360
450
6.2
11.7
15.2
22.1
24.8
31.0
70 130
160
220
260
320
4.8
9.0
11.0
15.2
17.9
22.1
20 1.4
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
850
2000
2000
2000
2000
2000
58.6
138
138
138
138
138
490
1300
1800
2000
2000
2000
33.8
89.6
124
138
138
138
210
600
800
1100
1300
1600
14.5
41.4
55.2
75.8
89.6
110
130
360
480
670
770
960
9.0
24.8
33.1
46.2
53.1
66.2
80
170
220
320
360
450
5.5
11.7
15.2
22.1
24.8
31.0
65
120
160
220
260
320
4.5
8.3
11.0
15.2
17.9
22.1
15 to 40 psig /
1.0 to 2.8 bar
10B3077X012
Green
15 1.0
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
1000
2000
2000
2000
2000
2000
69.0
138
138
138
138
138
380
1300
1800
2000
2000
2000
26.2
89.6
124
138
138
138
210
590
800
1100
1300
1600
14.5
40.7
55.2
75.8
89.6
66.2
130
350
470
640
780
960
9.0
24.1
32.4
44.1
53.8
66.2
80
170
220
320
370
450
5.5
11.7
15.2
22.1
25.5
31.0
65
120
160
220
260
320
4.5
8.3
11.0
15.2
17.9
22.1
20 1.4
60
100
125
175
200
250
4.1
6.9
8.6
12.1
13.8
17.2
630
2000
2000
2000
2000
2000
43.4
138
138
138
138
138
200
1200
1700
2000
2000
2000
13.8
82.7
117
138
138
138
150
550
760
1100
1300
1600
10.3
37.9
52.4
75.8
89.6
66.2
100
330
450
630
770
960
6.9
22.8
31.1
43.4
53.1
66.2
70
160
210
320
360
460
4.8
11.0
14.5
22.1
24.8
31.7
65
120
160
220
260
320
4.5
8.3
11.0
15.2
17.9
22.1
30 2.1
100
125
175
200
250
6.9
8.6
12.1
13.8
17.2
2000
2000
2000
2000
2000
138
138
138
138
138
950
1500
2000
2000
2000
65.5
103
138
138
138
450
670
1000
1200
1600
31.1
46.2
69.0
82.7
110
260
400
610
760
970
17.9
27.6
42.1
52.4
66.9
140
190
300
360
460
9.7
13.1
20.7
24.8
31.7
110
150
220
260
320
7.6
10.3
15.2
17.9
22.1
40 2.8
100
125
175
200
250
6.9
8.6
12.1
13.8
17.2
1500
2000
2000
2000
2000
103
138
138
138
138
700
1300
1800
2000
2000
48.3
89.6
124
138
138
330
560
1000
1200
1600
22.8
38.6
69.0
82.7
110
200
340
550
730
970
13.8
23.4
37.9
50.3
66.9
120
180
290
350
460
8.3
12.4
20.0
24.1
31.7
108
140
220
250
320
7.4
9.7
15.2
17.2
22.1
- Shaded areas indicate maximum inlet pressures allowed during system malfunction only. Table 1 gives the maximum inlet pressure for normal regulator operation.
1. The internal relief performance values are obtained by removing the disk assembly.
2. For inlet pressures in excess of 1000 psig / 69.0 bar, refer to the maximum body and disk pressure ratings in the Specications section.
3. For pressure settings under 10 psig / 0.69 bar, inlet pressure should be limited to approximately 100 psig / 6.9 bar so the setpoint adjustment can be obtained.
- continued -
WARNING
Maintenance
Unless otherwise specified, the following maintenance
procedures apply to all types of regulators. For a summary of
maximum torque values required for all types of regulators,
refer to Table 7.
Due to normal wear, damage from external sources or
debris in the air or gas line, regulator parts such as the
disk assembly orifice and diaphragm must be inspected
periodically and replaced as necessary to ensure correct
performance. The frequency of inspection and replacement
depends upon the severity of conditions and the
requirements of state and federal laws. Normal wear of the
orifice and disk assembly is accelerated with high pressure
drops and with large amounts of impurities in the flowstream.
Instructions are given below for replacing the disk assembly
orifice, diaphragm and O-rings. These procedures may
also be used for disassembly required for inspection and
replacement of other parts.
Note
Special tool required for Type 627OSX
Orifice Maintenance. 14 mm Hex with a 4 in. /
102 mm extension required to reach orifice.
Refer to Type OS2 Instruction Manual (D102778X012) for
instructions on maintaining the slam-shut.
Problem Indication for Types 627R, 627LR
and 627MR Regulators
Isolate the regulator from all pressure
to avoid personal injury and equipment
damage due to explosion or sudden
release of process pressure. Cautiously
release pressure from the regulator before
attempting disassembly.
8
627 Series

Table 3. Type 627R Internal Relief Performance(1) (continued)
OUTLET PRESSURE
RANGE, SPRING PART
NUMBER AND
COLOR CODE
OUTLET
PRESSURE
SETTING
MAXIMUM
ALLOWABLE
DOWNSTREAM
SYSTEM
PRESSURE
MAXIMUM INLET PRESSURE TO KEEP MAXIMUM ALLOWABLE DOWNSTREAM
SYSTEM PRESSURE FROM BEING EXCEEDED(2)(3)
Orice Size, In. / mm
3/32 / 2.4 1/8 / 3.2 3/16 / 4.8 1/4 / 6.4 3/8 / 9.5 1/2 / 13
psig bar psig bar psig bar psig bar psig bar psig bar psig bar psig bar
35 to 80 psig /
2.4 to 5.5 bar
10B3078X012
Blue
40 2.8
125
150
175
200
250
8.6
10.3
12.1
13.8
17.2
2000
2000
2000
2000
2000
138
138
138
138
138
1100
1600
2000
2000
2000
75.8
110
138
138
138
500
750
980
1200
1600
34.5
51.7
67.6
82.7
110
300
440
580
720
940
20.7
30.3
40.0
49.6
64.8
170
230
290
340
450
11.7
15.9
20.0
23.4
31.0
140
180
220
250
320
9.7
12.4
15.2
17.2
22.1
50 3.4
125
150
175
200
250
8.6
10.3
12.1
13.8
17.2
1400
2000
2000
2000
2000
96.5
138
138
138
138
820
1400
1900
2000
2000
56.5
96.5
131
138
138
400
650
700
1100
1500
27.6
44.8
48.3
75.8
103
230
370
530
670
920
15.9
25.5
36.5
46.2
63.4
150
210
270
330
430
10.3
14.5
18.6
22.8
29.6
140
170
210
240
320
9.7
11.7
14.5
16.5
22.1
60 4.1
125
150
175
200
250
8.6
10.3
12.1
13.8
17.2
900
1700
2000
2000
2000
62.1
117
138
138
138
450
1100
1700
2000
2000
31.0
75.8
117
138
138
270
540
780
1000
1400
18.6
37.2
53.8
69.0
96.5
190
300
470
610
880
13.1
20.7
32.4
42.1
60.7
140
190
250
310
420
9.7
13.1
17.2
21.4
29.0
130
160
200
230
310
9.0
11.0
13.8
15.9
21.4
70 4.8
150
175
200
250
10.3
12.1
13.8
17.2
1200
2000
2000
2000
82.7
138
138
138
850
1400
2000
2000
58.6
96.5
138
138
430
670
920
1300
29.6
46.2
63.4
89.6
250
400
550
830
17.2
27.6
37.9
57.2
170
230
280
400
11.7
15.9
19.3
27.6
160
190
230
310
11.0
13.1
15.9
21.4
80 5.5
150
175
200
250
10.3
12.1
13.8
17.2
800
1500
2000
2000
55.2
103
138
138
500
1200
1700
2000
34.5
82.7
117
138
300
550
800
1200
20.7
37.9
55.2
82.7
200
330
480
770
13.8
22.8
33.1
53.1
160
210
270
390
11.0
14.5
18.6
26.9
150
190
220
300
10.3
13.1
15.2
20.7
70 to 150 psig /
4.8 to 10.3 bar
10B3079X012
Red
70 4.8
175
200
250
12.1
13.8
17.2
1900
2000
2000
131
138
138
600
1200
2000
41.4
82.7
138
400
630
1100
27.6
43.4
75.8
260
380
680
17.9
26.2
46.9
200
250
360
13.8
17.2
24.8
175
210
290
12.1
14.5
20.0
80 5.5
175
200
250
12.1
13.8
17.2
1400
2000
2000
96.5
138
138
250
960
2000
17.2
66.2
138
240
520
1000
16.5
35.9
69.0
200
330
620
13.8
22.8
42.7
190
240
350
13.1
16.5
24.1
175
210
280
12.1
14.5
19.3
100 6.9 200
250
13.8
17.2
1500
2000
103
138
250
1600
17.2
110
240
770
16.5
53.1
230
520
15.9
35.9
210
320
14.5
22.1
210
270
14.5
18.6
125 8.6 250 17.2 2000 138 1000 69.0 500 34.5 390 26.9 290 20.0 260 17.9
150 10.3 250 17.2 1200 82.7 260 17.9 260 17.9 260 17.9 260 17.9 260 17.9
- Shaded areas indicate maximum inlet pressures allowed during system malfunction only. Table 1 gives the maximum inlet pressure for normal regulator operation.
1. The internal relief performance values are obtained by removing the disk assembly.
2. For inlet pressures in excess of 1000 psig / 69.0 bar, refer to the maximum body and disk pressure ratings in the Specications section.
3. For pressure settings under 10 psig / 0.69 bar, inlet pressure should be limited to approximately 100 psig / 6.9 bar so the setpoint adjustment can be obtained.
Table 4. Type 627LR Internal Relief Performance(1)
OUTLET PRESSURE
RANGE, SPRING
PART NUMBER AND
COLOR CODE
OUTLET
PRESSURE
SETTING
MAXIMUM ALLOWABLE
DOWNSTREAM
SYSTEM PRESSURE
MAXIMUM INLET PRESSURE TO KEEP MAXIMUM ALLOWABLE
DOWNSTREAM SYSTEM PRESSURE FROM BEING EXCEEDED(2)
Orice Size, In. / mm
3/32 / 2.4 1/8 / 3.2 3/16 / 4.8 1/4 / 6.4
psig bar psig bar psig bar psig bar psig bar psig bar
15 to 40 psig /
1.03 to 2.8 bar
10B3077X012
Green
30 2.1
55 3.8 500 34.5 270 18.6 110 7.6 80 5.5
60 4.1 850 58.6 480 33.1 200 13.8 120 8.3
66 4.5 1000 69.0 660 45.5 290 20.0 175 12.1
40 2.8
66 4.5 380 26.2 190 13.1 85 5.9 80 5.5
70 4.8 700 48.3 370 25.5 150 10.3 115 7.9
75 5.2 1000 69.0 560 38.6 240 16.5 160 11.0
1. The internal relief performance values are obtained by removing the disk assembly.
2. For inlet pressures in excess of 1000 psig / 69.0 bar, refer to the maximum body and disk pressure ratings in the Specications section.
9
627 Series

The vent assembly is equipped with a relief indicator (key 49,
Figure 4). The cap for the relief indicator snaps over the vent
assembly opening. If the relief valve opens wide, exhaust
gas pops the cap off the screen vent assembly opening
indicating a problem with the regulator. If the cap pops off,
refer to the shutdown and to the Body Area Maintenance
Procedures to inspect the disk assembly and orifice.
If the disk assembly and orifice are not damaged, refer to the
Diaphragm and Spring Case Area Maintenance Procedures
in this section.
The disk assembly and orifice can be inspected,
removed and replaced without removing the regulator
body from the line connections. Refer to the Body Area
Maintenance Procedures.
Body Area Maintenance Procedures
These procedures are for gaining access to the disk
assembly orifice, diaphragm casing O-ring and stem
assembly. All pressure must be released from the diaphragm
casing before performing these steps.
While using the following procedures, refer to
Figures 7 through 13 for key number locations.
Replacing the Disk Assembly or Orifice
1. To inspect and replace the disk assembly (key 9) or
orifice (key 2), remove the cap screws (key 3, Figure 5)
and separate the diaphragm casing (key 5) from the
body (key 1).
2. Inspect and, if necessary, remove the orifice (key 2). If
removed, coat the threads of the replacement orifice
with lubricant and torque to 25 ft-lbs / 34 N•m.
3. Inspect the disk assembly (key 9) and, if necessary,
remove the hair pin clip (key 13) that holds the disk
assembly (key 9) in place. If replacing the disk assembly
is the only maintenance required, skip to step 16.
Replacing the Stem Assembly
If it is necessary to perform maintenance on the stem
assembly, continue with steps 4 through 8 and 15 through 19
for Types 627, 627H, 627R and 627LR regulators or steps 9
through 19 for Types 627M, 627HM and 627MR regulators.
Table 5. Flow Coecients
ORIFICE 3/4 NPT NPS 1 / DN 25 BODY NPS 1-1/4 / DN 32 BODY NPS 2 / DN 50 BODY
In. mm
Wide-Open
Cgfor
External
Relief
Sizing
Wide-Open
Cvfor
External
Relief
Sizing
C1
Wide-Open
Cgfor
External
Relief
Sizing
Wide-Open Cg
for External
Relief
Sizing for
Type 627OSX
only
Wide-Open
Cvfor
External
Relief
Sizing
C1
Wide-Open
Cgfor
External
Relief
Sizing
Wide-Open
Cvfor
External
Relief
Sizing
C1
Wide-Open
Cgfor
External
Relief
Sizing
Wide-Open Cg
for External
Relief
Sizing for
Type 627OSX
only
Wide-Open
Cvfor
External
Relief
Sizing
C1
3/32 2.4 6.9 0.24 29.2 6.9 6.8 0.24 28.5 7.0 0.23 30.7 6.9 6.7 0.23 29.7
1/8 3.2 12.5 0.43 29.1 12.5 11.4 0.43 29.4 12.1 0.43 28.0 12.5 11.2 0.42 29.5
3/16 4.8 29 1.01 28.6 29 27 0.93 31.2 26 0.92 28.7 29 28.4 1.02 28.5
1/4 6.4 50 1.63 30.6 50 47.6 1.71 29.3 43 1.45 30.0 52 47.5 1.66 31.3
3/8 9.5 108 2.99 36.1 108 107 3.42 31.6 96 3.33 28.9 115 107.4 3.39 33.9
1/2 13 190 4.87 39.0 190 166.4 5.29 35.9 168 5.18 32.4 200 169.1 5.01 39.9
Table 6. IEC Sizing Coecients
ORIFICE SIZE XTFDFL
In. mm 3/4 NPT Body NPS 1 / DN 25 Body NPS 2 / DN 50 Body
3/32 2.4 0.539 0.514 0.558
0.50
0.85
1/8 3.2 0.536 0.547 0.539 0.79
3/16 4.8 0.517 0.616 0.514 0.85
1/4 6.4 0.592 0.543 0.620 0.87
3/8 9.5 0.824 0.632 0.727 0.89
1/2 13 0.962 0.815 1.01 0.86
Table 7. Maximum Torque Values
KEY NUMBER(1) DESCRIPTION MAXIMUM TORQUE
FOOT-POUNDS N•m
2 Orifice 25 34
3Cap screw (with aluminum diaphragm casing) 16 22
Cap screw (with ductile iron or steel/stainless steel diaphragm casing) 25 34
18 Lever cap screw 7 9.5
22 Diaphragm connector nut 17 23
26 Guide retainer (for Types 627R, 627LR and 627MR only) 3 4.1
37 Spring case cap screw (with aluminum or ductile iron diaphragm casing) 7 9.5
Spring case cap screw (with steel/stainless steel diaphragm casing) 35 47
46 Diaphragm cap screw (with Type 627 or 627M) 7 9.5
Diaphragm cap screw (with Type 627H or 627HM) 14 19
75 Slam-Shut Valve orifice 25 34
1. Refer to Figures 7 through 13 for key number locations.
10
627 Series

W4665
Perform steps 4 through 8 for Types 627, 627H, 627R,
627LR, 627OSX and 627HOSX Regulators only:
4. Use steps 5 through 8 to remove and replace the
stem assembly.
5. Remove the boost body (key 6), stabilizer (key 7)
and stem guide (key 8) from the diaphragm casing
(key 5). Unhook and remove the stem (key 10) from the
diaphragm casing (key 5).
6. Remove and inspect the diaphragm casing O-ring
(key 4, Figure 7, 8, 9 or 12) and replace it if necessary.
7. Apply lubricant to a replacement diaphragm casing
O-ring (key 4, Figure 7, 8, 9 or 12) and install it onto the
boost body (key 6). Skip to step 14.
8. For the Type 627 or 627H regulators, be sure to insert
the pitot tube (tab) into the outlet side of the body (see
Figure 7 or 12). Skip to step 14.
Perform steps 9 through 19 for Types 627M, 627HM,
627MR, 627MOSX and 627HMOSX Regulators only:
9. Use steps 10 through 14 to remove and replace the
stem assembly.
10. To remove the blocked throat (key 43), insert a screw
driver blade into the groove provided in the throat and
pry it out of the diaphragm casing (key 5). Inspect and
replace parts as necessary.
11. Inspect and, if necessary, replace the blocked throat
O-rings (key 44, Figure 5) and back-up rings (key 45,
Figure 5).
12. Apply lubricant to replacement blocked throat O-rings
(key 44) and back-up rings (key 45).
13. Apply lubricant to the replacement stem O-ring (key 11)
and stem back-up rings (key 12) and install them on the
stem (key 10).
14. For assembly, lubricate the stem (key 10) and insert
the diaphragm casing (key 5) and hook it on the lever
(key 15).
15. Lubricate the contact points of the lever (key 15).
16. Insert parts into the diaphragm casing (key 5) that were
removed in steps 5 and 6 or step 10 (see Figure 5).
17. Install the disk assembly (key 9), line up the hole in the
disk assembly and stem (key 10) and insert the hair pin
clip (key 13).
18. Position the diaphragm casing (key 5) plus attached
parts in relation to the body (key 1) so that they are
correct for the application.
19. Secure the diaphragm casing (key 5) to the body with
the cap screws (key 3, Figure 5). For an aluminum
diaphragm casing, torque the cap screws (key 3) to
16 ft-lbs / 22 N•m. For ductile iron or steel diaphragm
casings, torque the cap screws (key 3) to 25 ft-lbs /
34 N•m.
20. It may be necessary to reposition the diaphragm
spring case to prevent rain, ice and foreign debris from
entering the spring case. Refer to the Diaphragm and
Spring Case Area Maintenance Procedures, steps 1, 2
and 21 through 25.
Diaphragm and Spring Case Area
Maintenance Procedures
These procedures are for gaining access to the control
spring, diaphragm assembly and lever assembly. All spring
pressure must be released from the diaphragm casing
before these steps can be performed.
While using the following procedures, refer to
Figures 7 through 13 for key number locations.
1. Remove the adjusting screw cap (key 36), loosen the
lock nut (key 34) and turn the adjusting screw (key 35)
counterclockwise until all compression is removed from
the control spring (key 32).
2. Remove the spring case cap screws (key 37), the
nameplates and lift off the spring case (key 29). If
changing the control spring (key 32) or repositioning the
spring case (key 29) is the only maintenance required,
install the replacement control spring or rotate the spring
case so it is correct for the application. Skip to step 21.
For diaphragm area maintenance, continue with step 3.
3. Remove the diaphragm limiter O-ring and diaphragm
limiter (keys 51 and 50, on the Type 627H or 627HM
only). Remove the diaphragm assembly by tilting it so
that the pusher post (key 19) slips off the lever (key 15).
4. If it is necessary to replace the lever assembly, remove
the lever cap screws (key 18).
Figure 4. Relief Indicator
RELIEF
INDICATOR
CAP (KEY 49)
11
627 Series

W4791
W4792
Figure 5. Stem Assemblies
DIAPHRAGM
CASING
(KEY 5)
LEVER
(KEY 15) STEM (KEY 10)
STEM BACK-UP
RINGS
(KEY 12)
STEM O-RING
(KEY 11)
STEM GUIDE
(KEY 8)
DIAPHRAGM CASING
O-RING (KEY 4)
STABILIZER
(KEY 7)
BOOST
BODY (KEY 6)
PITOT TUBE
AND TAB FOR
TYPE 627 ONLY
DISK
ASSEMBLY
(KEY 9)
HAIR PIN
CLIP (KEY 13)
BODY
(KEY 1)
CAP
SCREW
(KEY 3)
TYPES 627, 627H, 627R AND 627LR
BLOCKED THROAT
BACK-UP RINGS (KEY 45)
BLOCKED
THROAT
(KEY 43)
TYPES 627M, 627HM AND 627MR
BLOCKED THROAT
O-RINGS (KEY 44)
5. Install the replacement lever (key 15) into the lever
retainer (key 16) by inserting the lever pin (key 17).
Secure the lever assembly into the diaphragm casing
with the cap screws (key 18) and torque the cap screws
to 7 ft-lbs / 9.5 N•m.
If it is necessary to perform maintenance on the
diaphragm assembly, continue with steps 6 through 11
and step 20 for Types 627, 627H, 627M, 627HM and all
627OSX variations regulators or steps 12 through 19 for
Types 627R, 627LR and 627MR regulators.
Perform steps 6 through 11 for Types 627, 627H, 627M,
627HM and all 627OSX variations Regulators only:
6. For Types 627, 627H, 627M and 627HM regulators
(Figures 5 and 6), use steps 7 through 11 to
disassemble and reassemble the diaphragm assembly.
7. Remove the diaphragm head cap screw (key 46),
lower spring seat (key 31, Type 627 or 627M only) and
diaphragm head (key 24). On the Type 627H or 627HM,
remove the pusher post O-rings (key 52). Separate the
diaphragm (key 23) from the pusher post (key 19).
8. Install the diaphragm (key 23), in reverse order in
step 7, on the pusher post (key 19), insert and finger
tighten the diaphragm head cap screw (key 46).
9. Hook the pusher post on the lever (key 15), then turn
the diaphragm (key 23) to match the holes in the
diaphragm with the holes in the spring casing.
10. Unhook the pusher post from the lever (key 15) and
torque the diaphragm head cap screw (key 46) to
7 ft-lbs / 9.5 N•m for the Type 627 or 627M. On the
Type 627H or 627HM, torque the diaphragm head cap
screw to 14 ft-lbs / 19 N•m.
11. Hook the pusher post on the lever (key 15) and check
the hole alignment. If necessary, loosen the cap screw
(key 46) and reposition the diaphragm (key 23) on the
pusher post (key 19). Retorque the screw (see step 10).
Skip to step 20.
Perform steps 12 through 19 for Types 627R, 627LR and
627MR Regulators only:
12. For Types 627R, 627LR and 627MR regulators
(Figure 6), use steps 13 through 19 to disassemble and
reassemble the diaphragm assembly.
13. Remove the guide retainer (key 26) and separate the
diaphragm parts. Refer to Figure 6 for the sequence
of parts.
ORIFICE
(KEY 2)
12
627 Series

14. To remove the diaphragm (key 23), remove the
diaphragm connector nut (key 22) and lift off the
diaphragm head (key 24) and diaphragm (key 23) from
the connector assembly (key 21). Do not attempt to
disassemble the connector assembly (key 21).
15. Position the replacement diaphragm (key 23)on the
connector assembly (key 21), install the diaphragm
head (key 24) and connector nut (key 22), then torque
to 17 ft-lbs / 23 N•m.
16. If necessary, replace the guide retainer O-ring (key 48)
and, set the guide retainer (key 26) aside, ready
for assembly.
17. On the pusher post (key 19) install the relief seal O-ring
(key 28) and apply lubricant. Also, install the relief
seal retainer (key 47), diaphragm connector assembly
(key 21, with attached parts) relief spring (key 27), upper
relief spring seat (key 33) and guide retainer (key 26).
Torque the guide retainer (key 26) to 3 ft-lbs / 4.1 N•m.
18. Hook the pusher post (key 19) (with attached parts) on
the lever (key 15) to check the alignment of the holes in
the diaphragm with the holes in the spring casing. If the
holes do not line up, unhook the pusher post from the
lever, hold the pusher post and rotate the diaphragm to
the correct position.
19. Install the lower spring seat (key 31) over the relief
spring so it rests flat on the connector nut (key 22).
20. Insert the diaphragm assembly into the diaphragm
casing (key 5) and hook the pusher post on the lever
(key 15).
21. Install the control spring (key 32) and upper spring seat
(key 33) and apply lubricant to the upper spring seat
(key 33).
22. Install the spring case (key 29) so that the screened
vent assembly (key 30) is in the correct position for
the application. Place the nameplates over the screw
holes, insert the spring case cap screws (key 37) and
finger tighten.
23. Screw in the adjusting screw (key 35) to put slack into
the diaphragm (key 23).
RELIEF VALVE
O-RING (KEY 28)
PUSHER POST
(KEY 19)
DIAPHRAGM
HEAD (KEY 24)
DIAPHRAGM
(KEY 23)
DIAPHRAGM CONNECTOR
NUT (KEY 22)
RELIEF VALVE
SPRING (KEY 27) GUIDE RETAINER
O-RING (KEY 48)
RELIEF SEAL
RETAINER (KEY 47) DIAPHRAGM CONNECTOR
ASSEMBLY (KEY 21)
LOWER SPRING
SEAT (KEY 31)
RELIEF SPRING
SEAT (KEY 25)
GUIDE RETAINER
(KEY 26)
W4668
PUSHER POST
(KEY 19)
DIAPHRAGM
(KEY 23)
PUSHER POST
O-RING (KEY 52)
DIAPHRAGM
HEAD (KEY 24) DIAPHRAGM LIMITER
O-RING (KEY 51)
DIAPHRAGM
LIMITER (KEY 50)
DIAPHRAGM
HEAD CAP
SCREW (KEY 46)
W5433-1
TYPE 627, 627R, 627LR, 627M OR 627MR
TYPES 627H AND 627HM
Figure 6. Diaphragm Assemblies
13
627 Series

24. Using a crisscross pattern, finish tightening the spring
case cap screws (key 37) to 7 ft-lbs / 9.5 N•m of torque.
25. If necessary, refer to the installation and/or the Startup
and Adjustment procedures.
26. Install the adjusting locknut (key 34) after
regulator adjustment.
Parts Ordering
When corresponding with your local Sales Office about this
equipment, always reference the equipment serial number or
FS number that can be found on the nameplate.
When ordering replacement parts, reference the key number
of each needed part as found in the following parts list.
Separate kits containing all recommended spare parts
are available.
See Type OS2 Instruction Manual (D102778X012) for
slam-shut parts.
Parts List
Note
In this parts list, parts marked NACE are
intended for corrosion-resistant service
as detailed in the NACE International
Standard MR0175.
Key Description Part Number
Type 627 Parts Kit with Aluminum/Nitrile (NBR) trim
(include keys 4, 9, 11, 12 and 23) R627X000A12
Type 627 Parts Kit with Stainless steel/
Nitrile (NBR) trim
(include keys 4, 9, 11, 12 and 23) R627X000S12
Type 627H Parts Kit with SST/Nylon (PA) trim R627HX00S12
Type 627R Parts Kit with Aluminum/
Nitrile (NBR) trim
(include keys 4, 9, 11, 12, 23, 28 and 48) R627RX00A12
Type 627R Parts Kit with Stainless steel/
Nitrile (NBR) trim
(include keys 4, 9, 11, 12, 23, 28 and 48) R627RX00S12
1 Body(1)
Ductile iron
1000 psig / 69.0 bar maximum inlet pressure
3/4 NPT 30B3046X012
1 NPT 30B3048X012
1-1/4 NPT ERAA42554A0
2 NPT 30B3096X012
Ductile iron (Long Body)
1000 psig / 69.0 bar maximum inlet pressure
1 NPT 39B2451X012
2 NPT 39B0414X012
Steel
2000 psig / 138 bar maximum inlet pressure
3/4 NPT 30B3050X012
1 NPT 30B3051X012
2 NPT 30B7452X012
Steel (Long Body)
2000 psig / 138 bar maximum inlet pressure
1 NPT 39B0412X012
2 NPT 39B0415X012
1 Body(1) (continued)
Steel, CL600 RF flanged
1500 psig / 103 bar maximum inlet pressure
NPS 1 / DN 25 40B6754X012
NPS 2 / DN 50 40B6756X012
Steel, CL300 RF flanged
750 psig / 51.7 bar maximum inlet pressure
NPS 1 / DN 25 41B8978X012
NPS 2 / DN 50 41B8080X012
Steel, CL150 RF flanged
290 psig / 20.0 bar maximum inlet pressure
NPS 1 / DN 25 43B8656X022
NPS 2 / DN 50 44B0666X012
Steel, BWE
1000 psig / 69.0 bar maximum inlet pressure
NPS 1 / DN 25 33B6723X012
NPS 2 / DN 50 38B1688X012
Steel, PN 16/25/40 RF
580 psig / 40.0 bar maximum inlet pressure
NPS 1 / DN 25 44B0386X012
NPS 2 / DN 50 44B3342X012
Stainless Steel(2), NPT
2000 psig / 138 bar maximum inlet pressure
3/4 NPT 30B3050X062
1 NPT 30B3051X092
2 NPT 30B7452X052
Stainless Steel(2), CL150 RF flanged
275 psig / 18.9 bar maximum inlet pressure
NPS 1 / DN 25 43B8656X052
NPS 2 / DN 50 44B0666X022
Stainless Steel(2), CL300 RF flanged
720 psig / 49.6 bar maximum inlet pressure
NPS 1 / DN 25 41B8978X072
NPS 2 / DN 50 41B8080X072
Stainless Steel(2), CL600 RF flanged
1440 psig / 99.2 bar maximum inlet pressure
NPS 1 / DN 25 40B6754X102
NPS 2 / DN 50 40B6756X062
Stainless Steel(2), PN 16/25/40 RF
580 psig / 40.0 bar maximum inlet pressure
NPS 1 / DN 25 44B0386X032
NPS 2 / DN 50 44B3342X032
Type 627OSX Bodies, Steel
Without Tap
NPS 1 / DN 25
NPT ERAA33145A0
SWE ERAA31302A0
CL150 RF ERAA44998A0
CL300 RF ERAA45039A0
CL600 RF ERAA45040A0
NPS 2 / DN 50
NPT ERAA33146A0
SWE ERAA32902A0
CL150 RF ERAA45027A0
CL300 RF ERAA45029A0
CL600 RF ERAA45031A0
With Tap
NPS 1 / DN 25
NPT ERAA34615A0
SWE ERAA34616A0
CL150 RF ERAA45033A0
CL300 RF ERAA45038A0
CL600 RF ERAA45041A0
NPS 2 / DN 50
NPT ERAA34618A0
SWE ERAA34619A0
CL150 RF ERAA45028A0
CL300 RF ERAA45030A0
CL600 RF ERAA45032A0
Key Description Part Number
*Recommended spare part.
1. Bodies can be used for both standard and NACE constructions.
2. Stainless steel body material can be used for applications in temperature ranges down to -40°F / -40°C and are only available for Types 627, 627R and 627H.
14
627 Series

2* Orifice
Aluminum
3/32 in. / 2.4 mm 0R044109022
1/8 in. / 3.2 mm 1A936709012
3/16 in. / 4.8 mm 00991209012
1/4 in. / 6.4 mm 0B042009012
3/8 in. / 9.5 mm 0B042209012
1/2 in. / 13 mm 1A928809012
303 Stainless steel
3/32 in. / 2.4 mm 0R044135032
1/8 in. / 3.2 mm 1A936735032
3/16 in. / 4.8 mm 00991235032
1/4 in. / 6.4 mm 0B042035032
3/8 in. / 9.5 mm 0B042235032
1/2 in. / 13 mm 1A928835032
316 Stainless steel, NACE construction only
3/32 in. / 2.4 mm 0R0441X0012
1/8 in. / 3.2 mm 1A9367X0022
3/16 in. / 4.8 mm 009912X0012
1/4 in. / 6.4 mm 0B0420X0012
3/8 in. / 9.5 mm 0B0422X0012
1/2 in. / 13 mm 1A9288X0012
3 Cap Screw (not shown), (2 required)
627 Series
For Ductile iron/Steel diaphragm case 1A560724052
For Aluminum diaphragm case
(not applicable for Types 627H and 627HM) 1A352524052
Type 627 Only
For Ductile iron/Steel diaphragm case 1A5607X0052
For Aluminum case with Steel diaphragm case 10A3869X012
For SST Case and body 1A5607X0052
For Aluminum Case and SST body 10A3869X022
Type 627OSX Only
For Steel Casings 1A560724052
For Ductile Iron Casings GF05446X572
4* Diaphragm Case O-ring
Nitrile (NBR)
For Type 627, 627H or 627R only 17A2325X022
Fluorocarbon (FKM)
For Types 627, 627R and 627LR only 10A0037X012
5 Diaphragm Case
For Type 627, 627R or 627LR
Aluminum without 1/8 in. / 3.2 mm gauge tap 40B3084X012
Aluminum with 1/8 in. / 3.2 mm gauge tap
for 627 Series (except Types 627H and 627HM) 11B5380X012
Ductile iron without 1/8 in. / 3.2 mm gauge tap 30B3053X012
Ductile iron with 1/8 in. / 3.2 mm gauge tap
for 627 Series (except Types 627H and 627HM) 31B0641X012
For Type 627, 627R or 627LR
Steel 30B3104X012
Ductile iron with 1/4 NPT gauge tap for
627 Series (except Types 627H and 627HM) 39A5987X012
Steel with 1/4 NPT gauge tap for 627 Series
(except Type 627H) 30B8734X012
For Type 627M or 627MR
Ductile iron 39A5987X012
Steel 30B8734X012
For Type 627H, Steel 30B3104X012
For Type 627, Stainless steel 30B3104X082
For Type 627HM, Steel 30B8734X012
6 Boost Body (not for Type 627M, 627HM
or 627MR), Delrin®
For Type 627 or 627H 30B3056X012
For Type 627R or 627LR 30B3057X012
7 Stabilizer
Nitrile (NBR)
For Types 627, 627H, 627R and 627LR only 10B3060X012
Fluorocarbon (FKM)
For Types 627, 627R and 627LR only 10B3060X022
8 Stem Guide (for Types 627, 627H, 627R and
627LR only), Powdered metal 20B3061X012
9* Disk Assembly (for all Orifice Size)
Aluminum holder and Nitrile (NBR) disk 1C4248X0212
303 Stainless steel holder and Nitrile (NBR) disk 1C4248X0202
Aluminum holder and Nylon (PA) disk 1C4248X00A2
303 Stainless steel holder and Nylon (PA) disk 1C4248X0062
316 Stainless steel holder and Nylon (PA) disk 1C4248X0262
316 Stainless steel holder and Nitrile (NBR) disk 1C4248X0252
303 Stainless steel holder and
Fluorocarbon (FKM) disk 1C4248X0052
Aluminum holder and Fluorocarbon (FKM) disk 1C4248X0182
316 Stainless steel holder and
Fluorocarbon (FKM) disk 1C4248X0192
10 Stem
303 Stainless steel 10B3059X012
316 Stainless steel (NACE) 10B3059X022
11* Stem O-ring
Nitrile (NBR) 1D687506992
Fluorocarbon (FKM) For Types 627, 627R,
627LR, 627M and 627MR only 1N430406382
12* Stem Back-up Ring,
Polytetrafluoroethylene (PTFE) (2 required) 1K786806992
13 Hair Pin Clip, Stainless steel 10B3058X012
14 Drive Pin, Plated steel 1H3671X0012
15 Lever, Plated steel 20B3063X012
16 Lever Retainer, Plated steel 30B3097X012
17 Lever Pin
Stainless steel 10B3083X012
316 Stainless steel (NACE) 10B3083X022
18 Lever Cap Screw (2 required)
Plated steel 10B7454X012
316 Stainless steel (NACE) 1B2905X0012
19 Pusher Post, Aluminum
For Type 627 or 627M 10B3098X012
For Type 627R, 627LR or 627MR 10B3098X022
For Type 627H or 627HM,
416 Stainless steel 10B3098X032
Stainless steel (NACE) 10B3098X102
21 Diaphragm Connector (for Type 627R, 627LR
or 627MR only), Stainless steel 28B8832X012
22 Diaphragm Connector Nut (for Type 627R, 627LR
or 627MR only), Stainless steel 10B7449X012
23* Diaphragm
Nitrile (NBR)
For Type 627 or 627M with Aluminum or
Ductile iron diaphragm case 10B3069X012
For Type 627 or 627M with
Steel diaphragm case 10B8735X012
For Type 627R, 627LR or 627MR with
Aluminum or Ductile iron diaphragm case 10B3068X012
For Type 627R, 627LR or 627MR with
Steel diaphragm case 10B8736X012
For Type 627H or 627HM with Steel
diaphragm case (diaphragm is Neoprene (CR)
with Nylon (PA) fabric) 12B0178X012
Fluorocarbon (FKM)
For Types 627R, 627LR and 627MR
with Steel case 10B8736X022
For Types 627 and 627M with Steel case 10B8735X042
For Types 627R, 627LR and 627MR
with Ductile Iron and Aluminum Casing 10B3068X022
For Types 627 and 627M
with Ductile Iron and Aluminum Casing 10B3069X032
24 Diaphragm Head, Plated steel
For Type 627 or 627M, Plated steel 1D666428982
For Type 627R, 627LR or 627MR, Plated steel 10B3071X012
For Type 627H or 627HM, 416 Stainless steel 12B0175X012
Key Description Part Number Key Description Part Number
*Recommended spare part.
Delrin®is a mark owned by E.I. du Pont de Nemours and Co.
15
627 Series

25 Relief Spring Seat (For Type 627R or
627MR only), Steel 10B7446X012
26 Guide Retainer (For Type 627R, 627LR or
627MR only), Stainless steel 10B7450X012
27 Relief Spring (For Type 627R or 627MR only),
Plated steel 10B6757X012
For Type 627LR 1B541327022
28* Relief Seal O-ring
Nitrile (NBR)
For Type 627R, 627LR or 627MR only 1J108506992
Fluorocarbon (FKM)
For Types 627R, 627LR and 627MR only 1J1085X0042
29 Spring Case
For Type 627, 627R or 627LR
Aluminum 40B3086X012
Ductile iron 30B3055X012
Steel 30B3102X012
Stainless steel (Types 627 and 627R only) 30B3102X092
29 Spring Case (continued)
For Type 627M or 627MR
Ductile iron 30B3055X012
Steel 30B3102X012
For Type 627H or 627HM
Steel 30B3102X012
Stainless steel (Type 627H only) 30B3102X092
30 Screened Vent Assembly, Plastic 10B3093X012
31 Lower Spring Seat, Plated steel
For Type 627 or 627M 1D666625072
For Type 627R, 627LR or 627MR 20B3073X012
32 Control Spring, Plated steel
5 to 20 psig / 0.34 to 1.4 bar, Yellow 10B3076X012
15 to 40 psig / 1.0 to 2.8 bar, Green 10B3077X012
35 to 80 psig / 2.4 to 5.5 bar, Blue 10B3078X012
70 to 150 psig / 4.8 to 10.3 bar, Red 10B3079X012
140 to 250 psig range / 9.7 to 17.2 bar, Blue,
used for Type 627H or 627HM 10B3078X012
240 to 500 psig range / 16.5 to 34.5 bar, Red,
used for Type 627H or 627HM 10B3079X012
33 Upper Spring Seat, Plated steel 1D667125072
34 Locknut, Plated steel 1D667728982
35 Adjusting Screw, Plated steel
For Type 627, 627M, 627H or 627HM 10B3081X012
For Type 627R, 627LR or 627MR 10B3080X012
36 Adjusting Screw Cap, Plastic 20B3082X012
37 Spring Case Cap Screw, Plated steel
(8 required)
For Aluminum or ductile iron diaphragm case 1A391724052
For Steel diaphragm case 1A368324052
For Stainless steel case and body 1A3683X0062
For Aluminum case and SST body 1A3917X0062
For Type 627H/HM, steel diaphragm case 1A346424052
For Type 627H, Stainless steel case and body 1A3464X0022
43 Blocked Throat (For Type 627M, 627HM or
627MR only), Stainless steel 10B3085X012
44* Blocked Throat O-ring
Nitrile (NBR) For Type 627M, 627HM or
627MR only (2 required) 1E264306992
Fluorocarbon (FKM)
For Types 627M and 627MR only 1E2643X0022
45* Blocked Throat Back-up Ring (For Type 627M,
627HM or 627MR only), PTFE (2 required) 10B3106X012
46 Diaphragm Head Cap Screw, Steel
For Type 627 or 627M 1B290524052
For Type 627H or 627HM 1C379124052
47 Relief Seal Retainer (For Type 627R, 627LR or
627MR only), Stainless steel 10B7445X012
48* Guide Retainer O-ring
Nitrile (NBR)
For Type 627R, 627LR or 627MR only 1D682506992
Fluorocarbon (FKM)
For Types 627R, 627LR and 627MR only 1N423906382
49 Relief Indicator (For Type 627R, 627LR or
627MR only), Rubber (not shown) 30B3100X012
50 Diaphragm Limiter
(For Types 627H and 627HM only) 22B0176X012
51* Diaphragm Limiter O-ring
For Types 627H and 627HM only 1K877606992
52* Pusher Post O-ring (2 required)
For Types 627H and 627HM only 1C853806992
58 Pipe Plug, Zinc 1D8293T0022
67 Drive Screw, 18-8 Stainless steel 1A368228982
72 Pipe Plug, Zinc-plated steel 1A767524662
75* Slam-shut seat ERAA32884A0
76* O-ring GE29958X012
Key Description Part Number Key Description Part Number
*Recommended spare part.
16
627 Series

18
37
5
8
4
7
6
1
2
L2
13
10
L2
L1
9
L1
12
16
17
14
15
19
46
23
24
31
30
33
36 35 34 32 29
11
L2
L2
L1
L2
30B3092_G
APPLY LUBRICANT(1)
L1 = MULTI-PURPOSE LITHIUM POLYMER TYPE GREASE
L2 = EXTREME LOW-TEMPERATURE BEARING GREASE
PARTS NOT SHOWN: 3
1. Lubricants must be selected such that they meet the temperature requirements.
Figure 7. Type 627 Regulator Assembly
17
627 Series

L1
L2
L1
L2 L2 L2 L2
L1
L2
29 34 36 35 33 26 32 18
5
8
4
7
6
1
2
9
13
1012
11
16
17
14
19
15
28
47
21
23
24
22
31
48
30
27
25
49 37
30B3089_G
APPLY LUBRICANT(1)
L1 = MULTI-PURPOSE LITHIUM POLYMER TYPE GREASE
L2 = EXTREME LOW-TEMPERATURE BEARING GREASE
PARTS NOT SHOWN: 3
1. Lubricants must be selected such that they meet the temperature requirements.
Figure 8. Type 627R Regulator Assembly
18
627 Series

L2
L2
L2
L2
L2
L1
L1
L2
29 34 36 35 33 26 32 18
37
5
8
4
7
6
1
2
9
13
1016
17
14
15
19
47
21
28
23
24
22
27
31
48
30
49
38B4843_C
APPLY LUBRICANT(1)
L1 = MULTI-PURPOSE LITHIUM POLYMER TYPE GREASE
L2 = EXTREME LOW-TEMPERATURE BEARING GREASE
PARTS NOT SHOWN: 3
1. Lubricants must be selected such that they meet the temperature requirements.
Figure 9. Type 627LR Regulator Assembly
19
627 Series

L2
L1
L2
L2 L2
L1
L2
L1
36
33
30
31
24
23
46
49
15
14 17 16 12
11 10 13
9
2
1
43
45
44
5
37
18
29
32
34
35
30B6433_E
APPLY LUBRICANT(1)
L1 = MULTI-PURPOSE LITHIUM POLYMER TYPE GREASE
L2 = EXTREME LOW-TEMPERATURE BEARING GREASE
PARTS NOT SHOWN: 3
1. Lubricants must be selected such that they meet the temperature requirements.
Figure 10. Type 627M Regulator Assembly
20
627 Series