IM-P316-03 CTLS Issue 14
17
Fig. 10
Flowrate = Maximum rating of pressure reducing valve
A = 10% of safety valve set pressure, 0.3 bar minimum
B = Normal system pressure variation
Note: The operating pressure of a system will var y and it is impor tant that the safety valve is set high enough
to accommodate such fluctuations.
10.2 Setting the valve
Spirax Sarco cannot be held responsible for unauthorised alteration of the set pressure.
Although not mandator y, Spirax Sarco recommend that SV615 metal seated valves for steam service should
be cold set on a test rig at 3% above the required set pressure. This does not apply if the valve is set on steam.
10.3 Valves supplied unset
Valves supplied unset to approved agents will include a set pressure tag to be stamped with the appropriate
set pressure in bar after setting.
The tag should be permanently attached to the valve when using the locking wire and polypropylene seal.
The back of the blue instruction label affixed to each unset valve will indicate the pressure range of the
spring fitted.
Re-seat differential
B
Operating pressure
No load condition
Maximum system
operating pressure
Maximum allowable
working pressure
or design pressure
of vessel
Maximum setting of
safety valve
A
Safety valve may
be set within
this range
Minimum setting of
safety valve
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