Emerson Fisher 627 Series User manual

627 Series
D101328X012
Instruction Manual
Form5252
07/89
Regulators www.FISHERregulators.com
627 Series Pressure Reducing Regulators
Introduction
Scope of Manual
This manual provides instructions for the installation,
adjustment,maintenance,andpartsordering forthe
627Series regulators.Theseregulators usually are
shippedseparate for line installation,although some-
timesthey are shippedinstalled on other equipment.
Refer to the instruction manual for the other equipment
forinstallation and operatinginstructions.
Description
The627Seriesself-operated pressure reducing regula-
tors (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 (see the AVAILABLE
CONFIGURATIONS specification in table 1).
Specifications
Table 1 gives some general specifications for the 627
Series regulators.Thenameplates (figure 2)gives
detailed information for a particular regulator as it
comes from the factory.
NUMBER 1
NUMBER 2
Figure2. Nameplates
Figure1. Typical 627Series Self-Operated
PressureReducing Regulator
W4793
10B3679-D
Incorporates Errata dated January 2001

627 Series
2
Available Constructions
Type 627:Self-operatedpressurereducingregulator
equippedwith a pitot tubefor greater regulated
capacities (figure 7)
Type 627R:Type 627 with internal relief and with an
openthroat(figure 8)
Type 627M:Type 627 with a stem seal between the
bodyoutlet pressure and diaphragmcase.Pressure
ismeasured under the diaphragm throughthe
1/4-inchNPT downstream control lineconnection
(figure9)
Type 627MR:Type627Mwithinternalrelief(figure10)
Type 627H:Type 627with a diaphragmlimiter to
delivera higher outlet pressure(figure 11)
Type 627HM:Type 627Hwith a stem seal between
the body outlet pressure and diaphragm case.
Pressureismeasured under the diaphragm through
two1/4-inch NPT downstream controlline
connections (figure 12)
Body Sizes
3/4, 1, or 2-inch
End Connection Styles
3/4, 1, or 2-inch body sizes: NPT
1 or 2-inch body sizes: ANSI Class 300 or 600 RF
flanged
Maximum Inlet Pressure(1) (Body Rating)
2000 psig (138 bar) for NPT steel, 1480 psig
(102 bar) for RF flanged steel, or 1000 psig (69 bar)
for ductile iron
MaximumValve Disk Inlet Pressure Rating(1)
2000 psig (138 bar) for nylon disk or 1000 psig (69
bar) for nitrile disk
Maximum Operating Inlet Pressure, Pressure
Differential, and Outlet Pressure Ranges(1)
See table 2 for pressures by port and spring range
Maximum Spring and Diaphragm Casing Pressure(1)
See table 3
1. The pressure/temperature limits in this instruction manual or any applicable standard limitation should not be exceeded.
Table1. Specifications
Maximum Body Outlet Pressure(1) (Type 627M,
627MR, and 627HM Only)
2000 psig (138 bar) for screwed steel, 1480 psig
(102 bar) for RF flanged steel, or 1000 psig (69 bar)
for ductile iron.(Type 627 and 627R are limited by
maximumdiaphragmcasing pressure)
Port Diameters
See table 2
Internal Relief Performance
Type 627R:See table 4
Type 627MR: Limitedbyfield-installed control line
piping
Temperature Capabilities(1)
-20to 180°F (-29to 82°C)
PressureRegistration
Type 627,627H or 627R:Internal
Type 627M,627HM or 627MR:External through
1/4-inch NPT control line connection in the
diaphragmcasing
De-Icer System
Seefigure 3 andType627MRegulator De-Icer
System Application section
Relief Indicator
For 627R and 627MR (see figures 8 and 9)
Spring CaseVent Connection
3/4-inchNPT female withremovable screened vent
assembly
Control Line Connection (Type 627M, 627HM or
627MR Only)
1/4-inchNPT female
ApproximateWeight
Ductile Iron or Steel Casings: 10pounds (4,5 kg)
Aluminum Casings: 6.3 pounds (2.8 kg)

627 Series
3
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Table 2. Maximum Inlet Pressures, Differential Pressures, and Outlet Pressure Ranges

627 Series
4
Personal injury, property damage,equip-
ment damage, or leakage due to escaping
gas or bursting of pressure-containing
parts may result if this regulator is over-
pressured or is installed where service
conditions could exceed the limits given
in tables 1, 2, 3, and 4, or where condi-
tions 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.TheType 627R or 627MR regulator
with internal relief will provide down-
stream overpressure protection within the
limits given in tables 1, 2, 3 and 4. If these
limits are exceeded additional down-
stream 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.
Installation
Regulatoroperationwithinratings does not preclude the
possibility of damage from debris in the lines or from
externalsources.Aregulatorshouldbeinspectedfor
damageperiodicallyandafteranyoverpressure condi-
tion. Key numbers referenced in this section are shown
infigures 7 through 12.Ensurethat the operating tem-
peraturecapabilities listed intable 1 are notexceeded.
Like most regulators, 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 Type 627, 627H,
627M, and 627HM regulators if the inlet pressure can
exceed the outlet pressure rating, since these regula-
tors do not have internal relief.
Type 627Rregulators provideinternal relief which limits
the total outlet pressure buildup over setpoint. Use table
4 to determine the total outlet pressure.This internal
relief may be adequate for the application, if not,
provide additional pressurerelief ora pressure limiting
devicedownstream.
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. Onlypersonnelqualified 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,
theregulator.
3. Ensure that all tubing and piping have been blown
freeof 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 operationis required during inspection
or maintenance, install a three-valve bypass aroundthe
regulator.
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Table3. MaximumSpringand DiaphragmCasing Pressure(1)

627 Series
5
A regulator may vent some gas to the
atmosphere. In hazardous or flammable
gas service, vented gasmay accumulate
and cause personal injury, death,or
property damage due to fire or explosion.
Vent a regulator in hazardousgas service
toa 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. Positionthe body (key1)and/or diaphragmspring
case (key 29) so it will not collectmoisture or debris into
thescreened vent. If theregulator requires reposition-
ing,refer to the bodyarea maintenance procedures
and/orthediaphragm case area maintenance proce-
dures in the Maintenance section to reposition the
screened vent for the application.
Perform steps 7 through 9 forTypes 627M, 627HM,
and 627MR regulators only:
7. AType627M,627HM, or 627MR regulatorrequires
a downstream control line. Install the control line before
putting the regulatorintooperation.
8. Ensure that the downstream control line piping is at
least3/8-inch or largeroutsidediameter tubing and
connected to a straight section of outlet piping 10
diameters downstream ofthe 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 unstability or cycling of the regulator.
Remote Vent Line Installation
All 627 series regulators have a vent assembly installed
in the 3/4-inch 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.The vent line should be as short as
possible with a 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.
Type 627M or 627HM Regulator De-
Icer System Application
For theType 627M or 627HM regulator de-icer system,
refer to the application shown in figure 3.With a large
pressuredrop across theworking regulator,ice can
Figure 3. Schematic of De-Icer System

627 Series
6
form with in this regulator.The formation of ice de-
creases the size of the port opening, so the regulator is
unable to supply enough flow to satisfy the downstream
demand.When thedownstreampressure fallsbelowthe
outlet pressure setting of theType 627M or 627HM
regulator, the disk assembly of theType 627Mor
627HMregulator moves off its seat ring, permitting
alcohol to flow into the main gas line.The alcohol
carried to the main regulator by the flow stream pre-
vents additional ice from forming on the seat ring.When
normalflow resumes, andas pressure in thedown-
stream system is restored, theType 627M or 627HM
regulator shuts off.
Startup and Adjustment
Startup
To avoid personal injury or property dam-
age due to explosion or damage to regula-
tor or downstream components during
startup,releasedownstream pressure to
preventanoverpressurecondition on the
diaphragm of the regulator.
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MUMIXAM ELBAWOLLA MAERTSNWOD ,ERUSSERPMETSYS (GISPrab)
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)1,2(03
)9,6(001 )6,8(521 )1,21(571 )8,31(002 )2,71(052 )831(0002 )831(0002 )831(0002 )831(0002 )831(0002 )5,56(059 )301(0051 )831(0002 )831(0002 )831(0002 )1,13(054 )2,64(076 )0,96(0001 )7,28(0021 )011(0061 )9,71(062 )6,72(004 )1,24(016 )4,25(067 )9,66(079 )66,9(041 )1,31(091 )7,02(003 )8,42(063 )7,13(064 )95,7(011 )3,01(051 )2,51(022 )9,71(062 )1,22(023
)8,2(04
)9,6(001 )6,8(521 )1,21(571 )8,31(002 )2,71(052 )301(0051 )831(0002 )831(0002 )831(0002 )831(0002 )3,84(007 )6,98(0031 )421(0081 )831(0002 )831(0002 )8,22(033 )6,83(065 )0,96(0001 )7,28(0021 )011(0061 )8,31(002 )4,32(043 )9,73(055 )3,05(037 )9,66(079 )82,8(021 )4,21(081 )0,02(092 )1,42(053 )7,13(064 )54,7(801 )66,9(041 )2,51(022 )2,71(052 )1,22(023
Table4. Type 627RInternal Relief Performance
(1)

627 Series
7
In order to avoid an overpressure condi-
tion and possible equipment damage,
pressure gauges should always be used
to monitor pressures during startup.
1. Slowly open the upstream shutoff valve.
2. Slowly open the downstream shutoff valve.
3. Check all connections for leaks.
4. Make final control spring adjustments according to
theadjustmentprocedures.
Adjustment
The range of allowable pressure settings is marked on
thenameplate (figure 2).If a pressure settingbeyond
this range is necessary, substitute the appropriate
regulatorcontrolspring. Change the nameplate to
indicatethe new pressure range.
Before increasing the setting, refer to tables 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.
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Table4. Type 627R Internal ReliefPerformance
(1)
(continued)

627 Series
8
Note
Always use a pressure gauge to monitor
pressure when making adjustments.
Refer to figures 7 through 12 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 counter-
clockwise.
4. When the desired pressure is obtained, hold the
adjusting screw (key 35) in place and tighten the
locknut (key 34).
Shutdown
To avoid personal injury or property dam-
age due to explosion or damage to regula-
tor or downstream components during
shutdown,releasedownstream pressure to
preventanoverpressurecondition on the
diaphragm of the regulator.
1. Close the nearest upstream shutoff valve.
2. Close the nearest downstream shutoff valve.
3. Open the vent valve between the regulator and the
downstream shutoff valve nearest to it.
4. For aType 627, 627H, or 627R regulator, the
regulatorwill open to releasepressure between the
upstream shutoff valve and the regulator.
5. AType627M,627HM, or 627MR regulatorrequires
ventingthe control lineand downstream pressure from
theregulatorbeforemaintenance.The pressure between
these shutoff valves is released through the open
regulator because the disk assembly remains open in
response to the decrease in control line pressure.
Maintenance
Unlessotherwise specified, the followingmaintenance
procedures apply to all types of regulators. For a
summary of maximum torque values required for all
types of regulators, refer to table 5.
Dueto normal wear, damage fromexternalsources,or
debris in the air or gas line, regulator parts such as the
disk assembly, seat ring, and diaphragm must be
inspected periodically and replaced as necessary to
ensure correct performance.The frequency ofinspec-
tion and replacement depends upon the severity of
conditionsand the requirementsof state and federal
laws. Normal wear of the seat ring and disk assembly is
accelerated withhigh pressuredrops andwith large
amounts of impurities in the flow stream. Instructions
are given below for replacing the disk assembly, seat
ring, diaphragm, and O-rings.These procedures may
also be used for disassembly required for inspection
and replacement of other parts.
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Table5. MaximumTorqueValues

627 Series
9
Problem Indication forType 627R 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.
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 seat ring.
If the disk assembly and seat ring are not damaged,
refer to thediaphragmand springcase area mainte-
nance procedures in this section.
The disk assembly and seat ring can be inspected,
removed,andreplaced without removing the regulator
body from the line connections. Refer to the body area
maintenanceprocedures.
Body Area Maintenance Procedures
These procedures are for gaining access to the disk
assembly, seat ring, diaphragm casing O-ring and stem
assembly.All pressure must be released from the
diaphragmcasing before theperformingthese steps.
While using the following procedures, refer to figures 7
through 12 for key number locations.
Replacing the Disk Assembly or Seat Ring
1. To inspect and replace the disk assembly (key 9) or
seat ring (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 seat ring
(key 2). If removed, coat the threads of the replace-
ment seat ring with lubricant (key 38) and torque to 25
foot-pounds(34N•m).
3. Inspect the disk assembly and, if necessary,
remove the hair pin clip (key 13) that holds the disk
assembly (key 9) in place. If replacing the disk assem-
bly 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
through19 forType 627,627H, and 627R regulators,or
steps 9 through 19 for Type 627M, 627HM, and 627MR
regulators.
Perform steps 4 through 8 forType 627,627H, and
627R Regulators only:
4. ForType627, 627H, and627R regulators (figure 5),
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
diaphragmcasing (key 5).
6. Remove and inspectthe diaphragm casing O-ring
(key 4, figure 7, 8, or 11) and replace it if necessary.
7. Apply lubricant (key 42) to a replacement dia-
phragm casing O-ring (key 4, figure 7, 8, or 11) and
install it onto the boost body (key 6). Skip to step 14.
8. For theType 627 or 627H regulators, be sure to
insert the pitot tube (tab) into the outlet side of the body
(see figure 7 or 11). Skip to step 14.
Perform steps 9 through 19 forType 627M,627HM,
and 627MR Regulators only:
9. ForType627M,627HM, and 627MR regulators
(figure 5), 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.
Figure4. Relief Indicator
W4665*
RELIEF
INDICATOR
CAP (KEY 49)

627 Series
10
11. Inspect and, if necessary, replace the blocked
throat O-rings (key 44, figure 5) and backup rings (key
45, figure 5).
12. Apply lubricant (key 42) to replacement blocked
throat O-rings (key 44) and backup rings (key 45).
13. Apply lubricant (key 42) to the replacement stem
O-ring (key 11) and stem backup rings (key 12) and
install them on the stem (key 10).
14. For assembly, insert the stem (key 10) into the
diaphragm casing (key 5) and hook it on the lever (key
15).
15. Insert parts into the diaphragm casing (key 5) that
were removed in steps 5 and 6 or step 10 (see figure 5).
16. Install the 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).
17. Position the diaphragm casing plus attached parts
in relation to the body (key 1) so that they are correct
for the application.
18. Secure the diaphragm casing to the body with the
cap screws (key 3, figure 5). For an aluminum dia-
phragm casing (key 5), torque the cap screws (key 3)
to 16 foot-pounds (22 N•m). For ductile iron or steel
diaphragm casings, torque the cap screws (key 3) to 25
foot-pounds(34N•m).
19. It may be necessary to reposition the diaphragm
spring case to prevent rain, ice, and foreign debris from
enteringthe spring case. Referto the diaphragm and
spring case area maintenance procedures, steps 1, 2,
and 21 through25.
Diaphragm and Spring Case Area Main-
tenance Procedures
These procedures are for gaining access to the control
spring, diaphragm assembly, and lever assembly.All
spring pressure mustbe releasedfrom the diaphragm
casing before these steps can be performed.
While using the following procedures, refer to figures 7
through 12 for key number locations.
1. Remove the adjusting screw cap (key 36), loosen
the lock nut, 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
step21. For diaphragm areamaintenance,continue with
step 3.
Figure5. Stem Assemblies
BLOKED THROAT
O-RINGS (KEY 44)
BLOCKED THROAT
(KEY 43)
BLOCKED THROAT
BACKUP RINGS (KEY 45)
Type 627M amd 627MR
W4791*
Type 627 and 627R
LEVER
(KEY 15)
DIAPHRAGM
CASING (KEY 5) STEM O-RING
(KEY 11)
STEM (KEY 10)
STEM GUIDE
(KEY 8)
STABILIZER
(KEY 7)
DIAPHRAGM CASING
O-RING (KEY 4)
BOOST BODY
(KEY 6)
DISK
ASSEMBLY
(KEY 9)
HAIR PIN CLIP
(KEY 13)
PITOTTUBE
AND TAB FOR
TYPE 627 ONLY
STEM BACKUP
RINGS
(KEY 12)
BODY
(KEY 1)
CAP SCREW
(KEY 3)
SEAT RING
(KEY 2)
W4792*