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5
Operating mode / Maintenance
The operating pressure of the plant is to be at least 5 % lower than the closing
pressure of the safety valve. In this way, the valve can satisfactorily close again
after blowing off.
ATTENTION:
When blowing off the safety valves, please note that gases can exhaust in high
velocity and with high temperature and excessive noise.
In the event of minor leaks, which may be caused by contamination between the
sealing surfaces, the valve can be made to blow off through lifting, for cleaning
purposes.
If this does not remove the leak the sealing surface is probably damaged and this
can only be repaired at our factory or by authorized specialists.
Safety valves with lifting device (version sGK)
In the case of safety valves with a lifting device it is recommended, and in certain
plant-specific cases even stipulated that the valves from time to time must be made
to blow-off by lifting the seal off the seat, in order to assure the correct functioning
of the safety valve. They can be made to open by hand at the latest when the
working pressure is > 85% of the response pressure.
Lifting is carried out by turning the twist-type lifting mechanism above the bonnet
in a counterclockwise direction. Turn the twist-type lifting mechanism back to the
stop again afterwards.
Safety valves without lifting device (version sGO; tGO)
In case of safety valves without lifting device -for technical reasons- the function
needs to be tested by the plant manufacturer.
Safety valves are the ultimate safety device for the tank or system. They must be
able to prevent impermissible overpressure even when all other upstream control
and monitoring equipment fail. To ensure these functional characteristics safety
valves require regular and recurring maintenance. The maintenance intervals are
determined by the operator independence of the operating conditions.
6
Dismantling the fitting
In addition to the general installation instructions it must be ensured that the
system is made pressure free prior to disassembly of the safety valve.
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Repairs
Repair work on safety valves is only to be carried out by Goetze KG Armaturen or by
officially approved specialist workshops authorized by Goetze KG Armaturen using
original spare parts only.
Assembly and maintenance instructions - 810/410, 812/412, 813/413, 690/691, 492, 492 GOX
www.goetze-armaturen.de
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