630 Series
4
!
WaRnIng
To avoid the consequences of over-
tightening the spring in spring-loaded
regulators or relief valves, consult
Table 4 and replace the adjusting screw
with one of the correct length when
replacing the spring.
Some pressure ratings are dependent upon the actual
outlet pressure settings being used. For example,
with a Type 630 regulator, outlet pressure must not
exceed the setting by more than 20 psig / 1.38 bar
for low pressure constructions or 200 psig / 13.8 bar
for high pressure constructions or damage to internal
regulator parts may occur. However, with some higher
pressure ranges, the setting plus 20 psig / 1.38 bar or
200 psig / 13.8 bar exceeds the maximum emergency
outlet (casing) pressure. Before increasing the setting,
refer to Tables 2 and 3 (as appropriate). Review the
pressure limits for the spring range being used and
be certain that the new pressure setting will not result
in an overpressure condition. Always use a pressure
gauge to monitor pressure when making adjustments.
adjusting Spring-loaded Regulators
and Relief Valves
Loosen the hex nut (key 2, Figures 4, 5 and 6) atop
the spring case. While monitoring the pressure,
rotate the adjusting screw (key 1, Figures 4, 5 and 6)
clockwise to increase set pressure or counterclockwise
to decrease it. When the unit is regulating or relieving
pressure at the desired value, tighten the hex nut.
Shutdown
Slowly close the upstream block valve.
Principle of Operation
This section describes the operation of the Type 630
regulator and the Type 630R relief valve with spring
loading. Set pressure is changed with the adjusting
screw on the regulator or relief valve. The Type 630R
relief valve uses a light spring for added stability.
Type 630 Regulators
Refer to Figure 2. In the regulator construction, outlet
pressure registers beneath the diaphragm. As long
as the outlet pressure is less than the set pressure,
spring force on the diaphragm causes the lever to hold
46A2977
A2526-1
Figure 3.
Type 630R Relief Valve Operational Schematic
46A2976-A
A2525-1
Figure 2.
Type 630 Regulator Operational Schematic
aTMOSPHERIC PRESSURE
OUTlET PRESSURE
InlET PRESSURE
aTMOSPHERIC PRESSURE
OUTlET PRESSURE
InlET PRESSURE
