Instruction Manual
Form 5252
07/89
Incorporates Errata dated January 2001
627 Series Pressure Reducing Regulators
627 Series
Introduction
Scope of Manual
This manual provides instructions for the installation,
adjustment, maintenance, and parts ordering for the
627 Series regulators. These regulators usually are
shipped separate for line installation, although sometimes they are shipped installed on other equipment.
Refer to the instruction manual for the other equipment
for installation and operating instructions.
Description
The 627 Series self-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. P erf ormance characteristics
vary according to construction (see the AVAILABLE
CONFIGURA TIONS specification in tab le 1).
Specifications
Table 1 gives some general specifications f or the 627
Series regulators. The nameplates (figure 2) giv es
detailed information for a particular regulator as it
comes from the factory.
W4793
Figure 1. Typical 627 Series Self-Operated
Pressure Reducing Regulator
Regulators
NUMBER 1
10B3679-D
NUMBER 2
Figure 2. Nameplates
D101328X012
www.FISHERregulators.com
627 Series
T ab le 1. Specifications
Av ailable Constructions
T ype 627: Self-oper ated 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 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-inch NPT downstream control line connection
(figure 9)
Type 627MR: T ype 627M with internal relief (figure 10)
Type 627H: Type 627 with a diaphragm limiter to
deliver a higher outlet pressure (figure 11)
Type 627HM: Type 627H with a stem seal between
the body outlet pressure and diaphragm case.
Pressure is measured under the diaphragm through
two 1/4-inch NPT downstream control line
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
Maximum V alve 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
See table 3
Maximum Body Outlet Pressure(1) (T ype 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
maximum diaphragm casing pressure)
Port Diameters
See table 2
Internal Relief Performance
Type 627R: See table 4
Type 627MR: Limited by field-installed control line
piping
Temperature Capabilities
(1)
-20 to 180°F (-29 to 82°C)
Pressure Registration
T ype 627, 627H or 627R: Internal
Type 627M, 627HM or 627MR: External through
1/4-inch NPT control line connection in the
diaphragm casing
De-Icer System
See figure 3 and Type 627M Regulator De-Icer
System Application section
Relief Indicator
For 627R and 627MR (see figures 8 and 9)
Spring Case Vent Connection
3/4-inch NPT female with removable screened vent
assembly
Control Line Connection (T ype 627M, 627HM or
627MR Only)
1/4-inch NPT female
Approximate Weight
Ductile Iron or Steel Casings: 10 pounds (4,5 kg)
(1)
Aluminum Casings: 6.3 pounds (2.8 kg)
1. The pressure/temperature limits in this instruction manual or any applicable standard limitation should not be exceeded.
2
627 Series
T able 2. Maxim um Inlet Pressures, Differential Pressures , and Outlet Pressure Ranges
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627 Series
T able 3. Maximum Spring and Diaphragm Casing Pressure(1)
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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 tables 1, 2, 3, and 4, or where conditions exceed any ratings of the adjacent
piping or piping connections.
T o av oid 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 T ype 627R or 627MR regulator
with internal relief will provide downstream overpressure protection within the
limits given in 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.
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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 f or the Type 627, 627H,
627M, and 627HM regulators if the inlet pressure can
exceed the outlet pressure rating, since these regulators do not have internal relief.
T ype 627R regulators provide internal 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 pressure relief or a pressure limiting
device downstream.
Note
If the regulator is shipped mounted on
another unit, install that unit according to
the appropriate instruction manual.
Perf orm 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.
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 n umbers referenced in this section are shown
in figures 7 through 12. Ensure that the operating temperature capabilities listed in table 1 are not exceeded.
4
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.
627 Series
Figure 3. Schematic of De-Icer System
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. Position the body (ke y 1) and/or diaphragmspring
case (key 29) so it will not collectmoisture or debris into
the screened vent. If the regulator requires repositioning, refer to the body area maintenance procedures
and/or the diaphragm case area maintenance procedures in the Maintenance section to reposition the
screened vent for the application.
Perform steps 7 through 9 f or T ypes 627M, 627HM,
and 627MR regulators only:
7. A Type 627M, 627HM, or 627MR 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-inch 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 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 v ent
assembly can be removed to install a remote vent line if
necessary. Remote vent lines must hav e 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. P eriodically check the vent opening to be sure
it is not plugged with foreign debris.
Type 627M or 627HM Regulator DeIcer System Application
For the T ype 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
5
627 Series
T able 4. Type 627R Internal Relief Performance
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)1,22(023
form with in this regulator. The f ormation of ice decreases the size of the port opening, so the regulator is
unable to supply enough flow to satisfy the downstream
demand. When the downstream pressure f alls below the
outlet pressure setting of the Type 627M or 627HM
regulator, the disk assembly of the Type 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 prevents additional ice from forming on the seat ring. When
normal flow resumes, and as pressure in the downstream system is restored, the Type 627M or 627HM
regulator shuts off.
6
Startup and Adjustment
Startup
To a v oid 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.
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