Emerson Fisher 627B Series User manual

W4793
627B Series Pressure Reducing Regulators
▲ 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. Figure 1. Typical 627B Direct-Operated
Pressure Reducing Regulator
▲ WARNING
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 and 2 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.
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.
Introduction
Scope of the Manual
This manual provides instructions for the installation, adjustment,
maintenance and parts ordering information for the 627B Series
Regulators. These regulators are usually shipped separately 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 627B 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.
Instruction Manual
D104602X012
December 2021
627B Series

Specifications
The Specifications section gives some general specifications for the 627B Series Regulators. The nameplates give detailed
information for a particular regulator as it comes from the factory.
Available Constructions
Type 627BM: Direct-operated, balanced port pressure
reducing regulator 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 6)
Type 627BMR: Type 627BM with token internal relief.
(Figure 7)
Type 627BHM: Type 627BM with a diaphragm limiter to
deliver a higher outlet pressure. (Figure 8)
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
Ductile iron: 1000 psig / 69.0 bar
Maximum Valve Disk Inlet Pressure Rating(1)
Nylon (PA) Disk: 1500 psig / 103 bar
Nitrile (NBR) Disk: 1000 psig / 69.0 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)
Types 627BM, 627BMR and 627BHM only
NPT Steel: 2000 psig / 138 bar
Flanged Steel: 1500 psig / 103 bar
Ductile iron: 1000 psig / 69.0 bar
Orifice Size
9/16 in. / 14.3 mm
Internal Relief Performance
Type 627BMR: Limited by field-installed control
line piping
Elastomer Temperature Capabilities(1)(2)
Flow Coefficients
See Table 3
Pressure Registration
Type 627BM, 627BMR or 627BHM: External through
1/4 NPT control line connection in the diaphragm casing
Relief Indicator
For Type 627BMR (see Figure 7)
Spring Case Vent Connection
3/4 NPT with removable screened vent assembly
Approximate Weights
627B Series
Ductile iron, Steel or Stainless steel Casings:
10 lbs / 5 kg
Aluminum Casing: 6.3 lbs / 3 kg
BODY SIZE END CONNECTION STYLE CONSTRUCTION
AVAILABLE
NPS DN
1 25 NPT, CL150 RF,
CL300 RF and CL600 RF All
2 50 NPT, CL150 RF,
CL300 RF and CL600 RF
MATERIAL DISK/
DIAPHRAGM
TEMPERATURE
°F °C
Nitrile (NBR)
Disk
-40 to 180 -40 to 82Diaphragm
O-ring
Fluorocarbon (FKM) Diaphragm 0 to 180 -18 to 82
Nylon (PA) Disk -40 to 180 -40 to 82
Neoprene (CR) for
Type 627BHM only Diaphragm -40 to 180 -40 to 82
1. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.
2. Stainless steel body is rated to -40°F / -40°C. Steel and Ductile iron bodies are rated to -20°F / -29°C.
2
627B Series

Product Description
Type 627B Direct-Operated Pressure Reducing Regulator—
The Type 627B Regulator provides 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.
Downstream Control Line for Type 627BM, 627BMR or
627BHM Regulator—A Type 627BM, 627BMR or 627BHM
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.
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 6 through 8. 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.
5. If continuous operation is required during inspection
or maintenance, install a three-valve bypass around
the regulator.
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.
Remote Vent Line Installation
All 627B 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.
▲ WARNING
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 627BM, 627BMR and
627BHM Regulators only:
7. A Type 627BM or 627BMR 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.
Overpressure Protection
The 627B 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 627BM and 627BHM Regulators if the inlet pressure can
exceed the outlet pressure rating, since these regulators do not
have internal relief.
Type 627BMR Regulator provides overpressure relief via a
small capacity or token relief that relieves minor overpressure
caused by thermal expansion or minor nicks in the orifice or
disk. Capacity of the token relief is limited by field-installed
control line piping.
3
627B Series

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
ERAA49923
Figure 2. Type 627BM Operational Schematic
ADJUSTING SCREW
DIAPHRAGM
PUSHER POST
LEVER ORIFICE
VALVE DISK
STEM
CONTROL SPRING
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Table 1. Maximum Inlet Pressures and Outlet Pressure Ranges
TYPE
OUTLET PRESSURE
RANGE SPRING
PART
NUMBER
COLOR
CODE
ORIFICE SIZE MAXIMUM INLET PRESSURE(1)
Nylon (PA) Disk Nitrile (NBR) Disk
psig bar In. mm psig bar psig bar
627BM and
627BMR
5(2) to 20 0.34 to 1.4 10B3076X012 Yellow
9/16(3) 14.3 1500 103 1000 69
15 to 40 1.0 to 2.8 10B3077X012 Green
35 to 80 2.4 to 5.5 10B3078X012 Blue
70 to 150 4.8 to 10.3 10B3079X012 Red
627BHM 140 to 250 9.7 to 17.2 10B3078X012 Blue
240 to 500 16.5 to 34.5 10B3079X012 Red
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. 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.
3. Only available with 9/16 in. / 14.3 mm orice. If a smaller orice is installed the unit will not achieve published capacities.
Table 2. Maximum Spring and Diaphragm Casing Pressure(1)
MAXIMUM PRESSURE DESCRIPTION DIAPHRAGM
CASING MATERIAL
TYPE 627BM TYPE 627BMR TYPE 627BHM
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)
Ductile iron
250 17.2
Not Available Not Available
Steel or Stainless steel 250 17.2 800 55.2
Maximum pressure to spring and diaphragm casings to
prevent burst of casings duringabnormal operation (leak to
atmosphere and internal parts damage may occur)
Ductile iron 465 32.1 465 32.1 Not Available
Steel or Stainless steel 1500 103 1500 103 1500 103
Maximum diaphragm casing overpressure (above setpoint) to
prevent damage to internal parts All materials 60 4.1 120 8.3 120 8.3
1. If the spring case is pressurized, a metal adjusting screw cap is required. Contact your local Sales O󰀩ce for details.
4
627B Series

Table 3. Flow Coecients
ORIFICE NPS 1 / DN 25 BODY NPS 2 / DN 50 BODY
In. mm Wide-Open Cgfor
External Relief Sizing
Wide-Open Cvfor
External Relief Sizing C1Wide-Open Cgfor External Relief Sizing
Wide-Open Cvfor
External Relief Sizing C1
9/16 14.3 211.6 5.6 37.8 219.3 6.0 36.0
Table 4. Maximum Torque Values
KEY NUMBER(1) COMPONENT CONSTRUCTION MAXIMUM TORQUE
Ft-lbs N•m
2 Orifice All 25 to 35 33.9 to 47.5
3 Cap screw, Body Aluminum lower casing 10 to 20 13.6 to 27.1
Ductile Iron or Steel lower casing 22 to 30 29.8 to 40.7
9Disk Holder Assembly All 20 to 24 in-lbs 2.3 to 2.7
18 Cap screw, Lever All 7 to 10 9.5 to 13.6
22 Nut, Diaphragm Connector 627BMR 15 to 20 20.3 to 27.1
26 Guide Retainer 627BMR 2.5 to 4 3.4 to 5.4
37 Cap screw, Spring Case
Ductile Iron or
Aluminum lower casing 7 to 10 9.5 to 13.6
Steel lower casing 36 to 40 48.8 to 54.2
46 Cap screw, Diaphragm Head 627BM 7 to 10 9.5 to 13.6
627BHM 12 to 16 16.3 to 21.7
78 Spring Seat Retainer All 55 to 60 in-lbs 6.2 to 6.8
1. Refer to Figures 6 through 8 for key number locations.
Startup and Adjustment
Startup
▲ WARNING
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.
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 or 2. 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 6 through 8 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).
5
627B Series

W4665
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 4.
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.
Figure 3. Relief Indicator
RELIEF
INDICATOR
CAP (KEY 49)
Problem Indication for Type 627BM Regulator
▲ WARNING
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.
The vent assembly is equipped with a relief indicator
(key 49, Figure 7). 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.
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 6 through 8 for key number locations.
Replacing the Disk Assembly and Orifice
1. To inspect and replace the disk assembly (key 9) or orifice
(key 2), remove the cap screws (key 36) 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 values shown in Table 4.
Note
Only install a 9/16 in. / 14.3 mm orifice on
Types 627BM, 627BMR and 627BHM
3. Inspect the disk assembly (key 9) and if necessary to
replace, skip to steps 7 through 12 to remove the stem
assembly from the lower casing. The disk assembly
cannot be replaced without removing the trim from the
lower casing.
Shutdown
▲ WARNING
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. A Type 627BM, 627BHM or 627BMR 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.
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.
6
627B Series

Stem Assembly Maintenance
7. Use steps 8 through 22 to remove and replace the
stem assembly.
8. 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).
9. Remove the spring case cap screws (key 37) and lift off the
spring case (key 29).
10. Remove the diaphragm limiter O-ring and diaphragm limiter
(keys 51 and 50, on Type 627BHM only). Remove the
diaphragm assembly by tilting it so that the pusher post
(key 19) slips off the lever (key 15).
11. Unhook the lever (key 15) from the spring retainer (key 78)
to free the stem assembly.
12. To remove stem assembly, insert a screw driver blade into
the groove provided in the blocked throat (key 43) and pry
it out of the diaphragm casing (key 5). Inspect and replace
parts as necessary.
13. To disassemble stem assembly, hold spring seat retainer
(key 78) while loosening the disk assembly with a
5/32 in. / 3.97 mm allen key insterted into the center of the
disk assembly (key 9). Slide blocked throat (key 43) off
of stem.
14. While holding stem (key 10) from where the disk assembly
attaches, unscrew spring seat retainer (key 78) which will
loosen the spring (key 79) and allow the stem to slide out of
the stem guide (key 8).
15. Inspect and if necessary, replace blocked throat O-rings
(key 44) and back-up rings (key 45).
16. Apply lubricant to replacement blocked throat O-rings
(key 44) and back-up rings (key 45).
17. Apply lubricant to the replacement stem O-rings
(keys 81, 82 and 88) and stem back-up rings
(keys 83, 84 and 89) and install on the stem (key 10).
18. To assemble stem assembly, insert stem (key 10) into stem
guide (key 8).
19. Apply a small amount of threadlock to the spring seat
retainer (key 78). Compress spring (key 79) with spring
seat (key 77) and torque spring seat retainer (key 78) to
torque values shown in Table 4 while holding stem. Excess
threadlock can interfere with the operation of the regulator
and potentially create unsafe conditions.
20. Insert stem assembly into blocked throat (key 43).
21. Place disk assembly O-ring (key 80) on disk assembly
(key 9). Install disk assembly on stem (key 10) and torque
to torque values shown in Table 4 while holding spring
seat retainer (key 78).
22. Slide stem assembly into diaphragm casing (key 5).
23. Continue to Diaphragm and Spring Case Area
Maintenance Procedures.
Figure 4. Stem Assemblies
LOWER CASING
KEY (KEY 5)
SPRING SEAT AND
SPRING SEAT RETAINER
(KEYS 77 AND 78)
STEM KEY
(KEY 10)
BLOCK THROAT (KEY 43)
BLOCK THROAT
O-RINGS (KEY 44)
BLOCK THROAT
BACK-UP RINGS
(KEY 45)
STEM O-RINGS
(KEYS 81, 82 AND 88)
STEM BACK UP RINGS
(KEYS 83, 84 AND 89)
SPRING (KEY 79)
STATIC O-RING
(KEY 80)
DISK ASSEMBLY (KEY 9)
BODY (KEY 1)
ORIFICE (KEY 2)
STEM GUIDE
(KEY 8)
4. To remove the disk assembly (key 9) once the stem
assembly has been removed from the lower casing, hold
the stem (key 10) in place by securing a wrench on the
spring seat retainer (key 78) and loosen the disk assembly
with a 5/32 in. / 3.97 mm allen wrench inserted into the
center of the disk. Inspect and, if necessary, replace the
static O-ring (key 80) if the disk assembly is removed.
5. Verify that the passageway through the center of the disk
assembly (key 9) is clear of any blockages.
6. Once disk maintenance is complete, slide stem assembly
into diaphragm casing (key 5), skip to Diaphragm and
Spring Case Area Maintenance Procedure section to build
the actuator.
7
627B Series

Perform steps 6 through 11 for Types 627BM and 627BHM
Variations Regulators only:
6. For Types 627BM and 627BHM Regulators
(Figures 6 and 8), 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 627BM) and diaphragm head
(key 24). On the Type 627BHM, 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 torque values
shown in Table 4.
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 Type 627BMR Variation
Regulator only:
12. For Type 627BMR Regulator (Figure 7), 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 7 for the sequence
of parts.
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 6 through 8 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 627BHM 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).
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 torque values shown
in Table 4.
W4668
W5433-1
PUSHER POST (KEY 19)
RELIEF VALVE O-RING (KEY 28)
RELIEF SEAL RETAINER (KEY 47) DIAPHRAGM CONNECTOR
ASSEMBLY (KEY 21)
DIAPHRAGM (KEY 23)
DIAPHRAGM HEAD (KEY 24)
DIAPHRAGM CONNECTOR NUT (KEY 22)
LOWER SPRING
SEAT (KEY 31)
RELIEF VALVE SPRING (KEY 27)
RELIEF SPRING
SEAT (KEY 25)
GUIDE RETAINER O-RING (KEY 48)
GUIDE RETAINER
(KEY 26)
TYPES 627BM AND 627BMR
TYPE 627BHM
DIAPHRAGM (KEY 23)
PUSHER POST (KEY 19)
PUSHER POST O-RING (KEY 52)
DIAPHRAGM
HEAD CAP
SCREW (KEY 46)
DIAPHRAGM LIMITER (KEY 50)
DIAPHRAGM LIMITER O-RING (KEY 51)
Figure 5. Diaphragm Assemblies
8
627B Series

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.
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
1 Body(1)
Ductile iron
1000 psig / 69.0 bar maximum inlet pressure
1 NPT 30B3048X012
2 NPT 30B3096X012
Steel
2000 psig / 138 bar maximum inlet pressure
1 NPT 30B3051X012
2 NPT 30B7452X012
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
2* Orifice
9/16 in. / 14.3 mm
Aluminum 1C4252X0012
303 SST 1C425235032
316 SST 1C4252X0022
3 Cap Screw (not shown), (2 required)
Steel 1A560724052
Stainless steel 1A5607X0052
5 Diaphragm Case
For Types 627BM, 627BMR, 627BHM
Ductile iron (not for Type 627BHM) ERAA50626A0
Steel ERAA50625A0
8 Stem Guide
Stainless steel ERAA51322A0
9* Disk Assembly
316 Stainless steel holder and Nitrile (NBR) disk ERAA49120A0
316 Stainless steel holder and Nylon (PA) disk ERAA49120A1
10 Stem, 316 Stainless steel (NACE) ERAA51314A0
14 Drive Pin, Stainless steel ERAA49515A0
15 Lever, Carbon 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
*Recommended spare part.
1. Bodies can be used for both standard and NACE constructions.
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 torque
values shown in Table 4.
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 torque values shown in Table 4.
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).
24. Using a crisscross pattern, finish tightening the spring case
cap screws (key 37) to torque values shown in Table 4.
25. If necessary, refer to the installation and/or the Startup and
Adjustment procedures.
26. Install the adjusting locknut (key 34) after
regulator adjustment.
9
627B Series

Key Description Part Number Key Description Part Number
KEY NUMBER PART DESCRIPTION ADJUSTMENT TOOL PART NUMBER
2 Orifice 7/8 in. / 22.2 mm Socket 1C4252
3 Cap Screw/Ductile iron, Steel or Stainless steel Casing 3/8 in. / 9.53 mm Hex/Allen Wrench 1A5607
9Disk Holder Assembly 5/32 in. / 3.97 mm Hex/Allen Wrench ERAA49120
10 Stem 1/2 in. / 12.7 mm Socket ERAA51314
35 Adjusting Screw 1/2 in. / 12.7 mm Adjustable End Wrench 10B3081
37
Cap Screw/Aluminum or Ductile iron Casing 1/4 in. / 6.35 mm Socket 1A3917
Cap Screw/Steel or Stainless steel Casing 3/8 in. / 9.53 mm Socket 1A36832
78 Spring Seat Retainer 3/8 in. / 9.53 mm Socket ERAA50115
33 Upper Spring Seat, Plated steel 1D667125072
34 Locknut, Plated steel 1D667728982
35 Adjusting Screw, Plated steel
For Types 627BM or 627BHM 10B3081X012
For Type 627BMR 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 627BHM, Steel diaphragm case 1A346424052
43 Blocked Throat, Stainless steel ERAA51294A0
44* Blocked Throat O-ring
(For Types 627BM, 627BHM or 627BMR only),
Nitrile (NBR) (2 required) ERAA19159A0
45* Blocked Throat Back-up Ring
For Types 627BM, 627BHM or 627BMR only),
Polytetrafluoroethylene (PTFE) (2 required) 10B3106X012
46 Diaphragm Head Cap Screw, Steel
For Type 627BM 1B290524052
For Type 627BHM 1C379124052
47 Relief Seal Retainer (For Type 627BMR only)
Stainless steel 10B7445X012
48* Guide Retainer O-ring (For Type 627BMR only)
Nitrile (NBR) 1D682506992
49 Relief Indicator (For Type 627BR or
627BMR only), Rubber (not shown) 30B3100X012
50 Diaphragm Limiter
(For Type 627BHM only) 22B0176X012
51* Diaphragm Limiter O-ring
(For Type 627BHM only) ERAA19160A5
52* Pusher Post O-ring (2 required)
(For Type 627BHM only) 1C853806992
58 Pipe Plug, Zinc 1D8293T0022
67 Drive Screw, 18-8 Stainless steel 1A368228982
72 Pipe Plug, Zinc-plated steel 1A767524662
77 Spring Seat, Stainless steel ERAA50118A0
78 Spring Seat Reatiner, Stainless steel ERAA50115A0
79 Spring
Stainless steel ERAA50082A0
NACE ERAA50061A0
80* O-ring (Disk Holder) ERAA49442A0
81* O-ring (Stem - Small) ERAA49363A0
82* O-ring (Stem - Large) ERAA49364A0
83* Back-up Ring (Small) ERAA49365A0
84* Back-up Ring (Large) ERAA49366A0
88* O-Ring (Blocked Throat) 1D541506992
89* Back-up Ring (Blocked Throat) ERAA51338A0
*Recommended spare part.
19 Pusher Post
For Type 627BM, Aluminum 10B3098X012
For Type 627BMR, 316 Stainless steel ERAA51240A0
For Type 627BHM
316 Stainless steel ERAA51241A1
NACE ERAA51241A0
21 Diaphragm Connector (for Type 627BMR only)
Stainless steel 28B8832X012
22 Diaphragm Connector nut (for Type 627BMR only)
Stainless steel 10B7449X012
23* Diaphragm
Nitrile (NBR)
For Type 627BM with Aluminum
or Ductile iron diaphragm case 10B3069X012
For Type 627BM with Steel diaphragm case 10B8735X012
For Type 627BMR with Aluminum
or Ductile iron diaphragm case 10B3068X012
For Type 627BMR with Steel diaphragm case 10B8736X012
For Type 627BHM with Steel diaphragm case
(diaphragm is Neoprene (CR) with
Nylon (PA) fabric) 12B0178X012
24 Diaphragm Head
For Type 627BM, Plated steel 1D666428982
For Type 627BMR, Plated steel 10B3071X012
For Type 627BHM, 416 Stainless steel 12B0175X012
25 Relief Spring Seat (For Type 627BMR only)
Steel 10B7446X012
26 Guide Retainer (For Type 627BMR only)
Stainless steel 10B7450X012
27 Relief Spring (For Type 627BMR only)
Plated steel 10B6757X012
28* Relief Seal O-Ring (For Type 627BMR only) ERAA19157A0
29 Spring Case
For Type 627BM or 627BMR
Ductile iron 30B3055X012
Steel 30B3102X012
For Type 627BHM
Steel 30B3102X012
30 Screened Vent Assembly, Plastic 10B3093X012
31 Lower Spring Seat, Plated steel
For Type 627BM 1D666625072
For Type 627BMR 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 627BHM 10B3078X012
240 to 500 psig range / 16.5 to 34.5 bar, Red,
used for Type 627BHM 10B3079X012
10
627B Series

35
T1
46
31
24
36
34
33
30
23
19
18
17 16
79
81 82
43
45
45
80
88
89
37
32
29
44
84
83
14
15
5
8
9
2
1
44
L2
L2
L2
L2L2
L2
L2
L1
L1
L1
L1
L1
10
78
77
34
29
49
33
32
30
31
27
48
23
28
47 19
77
18 15
14 78
79
83
81
17
16
5
8
9
1
2
T1
82
84
10
89 88 44
80
45
37
24
22
21
25
26
36
35
44 43
L2
L2
L2L2
L2
L2
L2
L1 L1
L1
L1
ERAA50665_AB
Figure 6. Type 627BM Regulator Assembly
ERAA49923_AB
APPLY LUBRICANT(1)
L1 = MULTI-PURPOSE LITHIUM POLYMER TYPE GREASE
L2 = EXTREME LOW-TEMPERATURE BEARING GREASE
T1 = APPLY THREADLOCK
1. Lubricants must be selected such that they meet the temperature requirements.
APPLY LUBRICANT(1)
L1 = MULTI-PURPOSE LITHIUM POLYMER TYPE GREASE
L2 = EXTREME LOW-TEMPERATURE BEARING GREASE
T1 = APPLY THREADLOCK
1. Lubricants must be selected such that they meet the temperature requirements.
Figure 7. Type 627BMR Regulator Assembly
11
627B Series

35
L1
L1
L1
30
46
24
51
50
23
577
18
19
14
15
T1
2
9
1
17 16 83
81
79
78
82 84 89 88
10
80
44
43
45
L2
L2
L2L2L2
L2
8
37
52
32
29
36
34
33
ERAA49929_AB
D104602X012 © 2021 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 12/21.
The Emerson logo is a trademark and service mark of Emerson Electric Co.
All other marks are the property of their prospective owners.
Fisher™ is a mark owned by Fisher Controls International LLC, a business
of Emerson Automation Solutions.
The contents of this publication are presented for informational purposes
only, and while every e󰀨ort has been made to ensure their accuracy,
they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use
or applicability. All sales are governed by our terms and conditions, which
are available upon request. We reserve the right to modify or improve the
designs or specications of such products at any time without notice.
Emerson Process Management Regulator Technologies, Inc does not
assume responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use and maintenance of any Emerson
Process Management Regulator Technologies, Inc. product remains solely
with the purchaser.
APPLY LUBRICANT(1)
L1 = MULTI-PURPOSE LITHIUM POLYMER TYPE GREASE
L2 = EXTREME LOW-TEMPERATURE BEARING GREASE
T1 = APPLY THREADLOCK
1. Lubricants must be selected such that they meet the temperature requirements.
Figure 8. Type 627BHM Regulator Assembly
627B Series
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