Type 627F
4
When downstream pressure increases due to lowered
demand, greater pressure is registered on the pilot
diaphragm and the lever side of the main regulator
diaphragm. The pilot closes, and the excess loading
pressure bleeds off to downstream, through the pilot
restriction. With the lower loading pressure, the spring
can move the main regulator disk closer to the orice.
Under no ow conditions, the excess loading pressure
bleeds through the pilot restriction to the downstream
system until the loading pressure and outlet pressure
equalize. The main valve is closed by the spring and
the bleed stops.
Installation
Only personnel qualied through training and
experience should install, operate, or maintain this
regulator. Regulator operation within ratings does
not preclude the possibility of damage from debris
in the lines or from external sources. Key numbers
referenced in this section are shown in Figures 3 and 4.
1. A regulator should be inspected for damage
periodically and after any overpressure condition.
2. Ensure that the operating temperature capabilities
listed in the Specications section are not exceeded.
3. A pressure-relieving or pressure-limiting device
must be provided by the user if the inlet pressure
can exceed the outlet pressure rating of the
downstream equipment.
4. Make sure that there is no damage to, or foreign
material in the regulator. Ensure that all tubing
and piping have been blown free of foreign debris.
5. The regulator may be installed in any position as
long as the ow through the body is in the direction
indicated by the arrow cast on the body and both
pilot openings are connected.
6. If continuous operation is required during
inspection or maintenance, install a three-valve
bypass around the regulator.
!
WARNING
A regulator may vent some gas to
the atmosphere. In hazardous or
ammable gas service, vented gas may
accumulate and cause personal injury,
death, or property damage due to re 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.
To keep the pilot spring case vent from being plugged
or the spring case from collecting moisture or other
foreign material, point the vent down or otherwise
protect it. To change vent orientation, remove the
spring case and remount it on the pilot body.
Table 4. Flow Coefcients
Table 5. IEC Sizing Coefcients
ORIFICE SIZE
3/4 NPT BODY NPS 1 / DN 25 BODY NPS 2 / DN 50 BODY
Wide-Open Wide-Open
C
1
Wide-Open Wide-Open
C
1
Wide-Open Wide-Open
C
1
inches mm C
g
C
v
C
g
C
v
C
g
C
v
3/8 x 1/8 9.5 x 3.2 12.5 0.43 29.1 12.5 0.43 29.4 12.5 0.43 29.2
3/8 x 1/4 9.5 x 6.4 50 1.63 30.6 50 1.71 29.3 52 1.66 31.3
3/8 9.5 108 2.99 36.1 108 3.42 31.6 11.5 3.39 33.9
1/2 13 190 4.87 39.0 190 5.29 35.9 200 5.01 39.9
ORIFICE SIZE X
T
F
D
F
L
inches mm 3/4 NPT Body NPS 1 / DN 25 Body NPS 2 / DN 50 Body
1/8 3.2 0.54 0.55 0.54
0.50
0.79
1/4 6.4 0.59 0.54 0.62 0.87
3/8 9.5 0.82 0.63 0.73 0.89
1/2 13 0.96 0.82 1.01 0.86
(20 Seiten)
(1 Seiten)
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