Type 627F
3
Description
The Type 627F pilot-operated (Type 6351F pilot)
pressure reducing regulator (Figure 1) provides
economical, accurate pressure control in a wide variety
of applications using pressure factor measurement
(xed factor billing). The regulator can be used with
natural gas, air, or a variety of other gases.
Principle of Operation
The superior performance of a Type 627F regulator is
due to the amplifying effect of the pilot and the two-path
control system (Figure 2). Changes in outlet pressure
act quickly on the main regulator diaphragm which
repositions the valve disk to provide fast response to
system changes. Simultaneously, the pilot amplies
system pressure changes to position the main
regulator valve disk for precise pressure control.
Inlet pressure is used for the pilot supply pressure.
If downstream ow increases, lowering the outlet
pressure below the regulator setpoint, pressure on
the pilot diaphragm and the lever side of the main
regulator diaphragm decreases. The pilot opens to
supply the required loading pressure increase. The
increased loading pressure from the pilot overcomes
the main regulator spring force, and the main
regulator valve disk moves farther open to supply the
required ow.
Figure 2. Type 627F Pilot-Operated Pressure Reducing Regulator Operational Schematic
FILTER (FACTORY
INSTALLATION
OPTIONAL)
PILOT DIAPHRAGM
LEVER
VALVE DISK
TYPE 6351F PILOT
TYPE 627F REGULATOR
MAIN REGULATOR
DIAPHRAGM
RESTRICTION
(BLEED)
FIELD INSTALLED
DOWNSTREAM
CONTROL LINE
PILOT ADJUSTING
SCREW
TENSION SPRING
SPRING SEAT BOLT
(THIS IS NOT AN
ADJUSTING SCREW)
PILOT SUPPLY TUBING
(FACTORY INSTALLATION OPTIONAL)
A6558
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
PILOT SUPPLY PRESSURE
VACUUM PRESSURE
TANK PRESSURE
VAPOR PRESSURE
LOADING PRESSURE
Table 3. Additional Specications
ORIFICE SIZE
ALLOWABLE INLET PRESSURE RANGE FOR MAINTAINING OUTLET PRESSURE
WITHIN ±1% OF THE ABSOLUTE OUTLET PRESSURE SETTING
(1)
5 psig / 0.34 bar 30 psig / 2.1 bar 40 psig / 2.8 bar 60 psig / 4.1 bar 100 psig / 6.9 bar
inch mm psig bar psig bar psig bar psig bar psig bar
3/8 x 1/8
3/8 x 1/4
3/8
1/2
9.5 x 3.2
9.5 x 6.4
9.5
13
30 to 250
30 to 250
30 to 250
25 to 125
2.1 to 17.2
2.1 to 17.2
2.1 to 17.2
1.7 to 8.6
55 to 250
55 to 250
55 to 250
50 to 125
3.8 to 17.2
3.8 to 17.2
3.8 to 17.2
3.4 to 8.6
65 to 250
65 to 250
65 to 250
60 to 125
4.5 to 17.2
4.5 to 17.2
4.5 to 17.2
4.1 to 8.6
85 to 250
85 to 250
85 to 250
80 to 125
5.9 to 17.2
5.9 to 17.2
5.9 to 17.2
5.9 to 8.6
125 to 250
125 to 250
125 to 250
120 to 125
8.6 to 17.2
8.6 to 17.2
8.6 to 17.2
8.3 to 8.6
1. For best performance, outlet pressure setting should be made using an inlet pressure that is midway between the highest and lowest expected inlet pressure.
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