Safety relief valves
33501, 33502, 33503, 33521, 33601, 33602, 33603, 33621
Maintenance
BA(k)_033501.06_EN
2023-07-27 Albert Handtmann Armaturenfabrik GmbH & Co. KG 25 / 30
maintenance procedure. The maintenance intervals depend on the operating
conditions and must be determined by the plant operator.
– If, for maintenance purposes, protection devices have been attached or if supply
and exhaust lines to the safety relief valve blocked, the protection devices must
be disassembled and line blockages must be removed.
– Ensure that a function check is always performed on the safety relief valve
following maintenance work.
Warning - general hazards!
Make sure that there aren't any persons in the hazardous area of the exhaust line.
(Attach a warning sign if required).
Also refer to the chapter "Safety Instructions".
Pneumatic lifting
1. Apply compressed air to the pneumatic actuator to lift the safety valve.
The safety valve must open (lifting motion) and blow off.
2. Relieve the pneumatic actuator of pressure.
The test has been completed.
Pressurizing
1. Pressurize the piping system / tank with a gas pressure slightly above the set pressure
of the safety valve.
The safety valve must open (lifting motion) and blow off.
2. Reduce the gas pressure of the piping system / tank to the normal or operating
pressure.
The test has been completed.
Manual lifting
1. First, turn the lifting nut clockwise against the actuator and then turn another
1-2 turns.
This will lift the valve disk and the valve will blow off.
2. To close the valve, turn the lifting nut anticlockwise up to the cap nut (or to the
proximity switch).
The test has been completed.
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