Maintenance
WARNING: To avoid personal injury and
equipment damage, isolate the regulator or
relief valve from all pressure. Cautiously
release pressure from the regulator or relief
valve before attempting disassembly.
Due to normal wear that may occur in regulators and
relief valves, parts such as the valve disc, seat ring
and diaphragm must be inspected periodically and
replaced as necessary. The frequency of inspection
and replacement depends upon the severity of
service conditions or federal and provincial laws.
Normal wear of the seat ring and valve disc is
accelerated with high-pressure drops and with large
amounts of impurities in the flow stream.
Instructions are given below for replacing the seat
ring, valve disc and diaphragm. These instructions
may also be used for disassembly required for
inspection and replacement of other parts.
If the loading regulator of pressure-loaded
constructions requires maintenance, disconnect the
supply pressure line (and bleed orifice vent line if
one is present) and unscrew the loading regulator
from its mounting nipple. Refer to the separate
instruction manual for maintenance information.
Seat Ring and Valve Disc:
Note: With some piping systems it may be
possible to omit step 1 below by removing
four cap screws (Key 7) and spreading the
body (Key 1) and adaptor (Key 6) far
enough apart to allow removal of the seat
ring (Key 4) and Type 630 HP valve disc
(Key 3) or Type 630R valve seat O-ring
(Key 32). However, take care to avoid
pinching fingers between body and adapter.
1. Disconnect piping from Adapter (Key 6).
Remove four cap screws (Key 7) and adapter.
2. Remove seat ring (Key 4) and gaskets (Key 5).
3. To remove Type 630 HP valve disc (Key 3) OR
Type 630R valve seat O-ring (Key 32), first
disconnect remote vent pipe (if one is used).
For pressure loaded constructions, disconnect
loading regulator supply line.
4. Unscrew the two cap screws that secure
the diaphragm adaptor (Key 11) to body
(Key 1); remove diaphragm adaptor and
attach spring case (Key 21).
5. Remove valve carrier assembly (Key 2)
from body.
6. To replace seating surface:
6.1. For Type 630 HP, use a ¾” socket
wrench to remove and re-install valve
disc and holder assembly (Key 3).
6.2. For Type 630R, unscrew machine
screw (key31) and remove O-ring
washer and O-ring (Key 28 and 32)
from O-ring holder (Key 3). When
reassembling, apply a good quality
gasket shellac to the machine screw
thread.
7. Use new seat ring gaskets (Key 5) and
body gasket (Key 8) when reassembling.
Insert valve carrier assembly (Key 2) into
the body before re-installing the
diaphragm adaptor.
8. The spring case (Key 21) must point away from
the adaptor (Key 6) on Type 630 HP regulators.
On Type 630R relief valves, the spring case
must face the same direction as the adaptor
(Key 6). Be certain the lever (Key 10) engages
the valve carrier.
Diaphragm
1. Relieve spring compression as follows:
1.1 For spring loaded constructions, loosen
locknut (Key 22). Turn the adjusting screw
(Key 23) counterclockwise until spring
compression is relieved.
1.2 For pressure loaded Type 630R relief valves
(and for pressure loaded Type 630 HP
regulators that have been furnished with a
spring), turn cap screw (Key 23)
counterclockwise until spring compression is
relieved.
2. Disconnect remote vent line (if one is present).
3. For pressure loaded constructions, disconnect
the supply line from the loading regulator (Key
25).
4. Remove spring case (Key 21) by unscrewing
cap screws and nuts (Key 14).
5. Remove diaphragm (Key 13) and attached parts
from lever assembly (Key 10).
6. Unscrew cap screw (Key 18) from connector
head assembly (Key 12) and disassemble the
diaphragm assembly.
7. Install new diaphragm. Note that low-pressure
constructions use a diaphragm plate (Key 16)
on the spring case side of the diaphragm. Low
pressure, pressure loaded constructions use a
diaphragm plate on each side of the diaphragm
plate gasket (Key 33) with each plate. Install
new gaskets when replacing diaphragm.
8. When reassembling, be certain that the
diaphragm connector is engaged on the lever.
