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3
Range of Application
According to valve version:
As pressure limiting valve (proportional safety valve) for non-adhesive liquids,
gas, steam for protection against excess pressure in pressure tanks or steam boilers
as well as pressure-holding equipment parts for pressure devices in compliance
with the EC pressure equipment directive.
As overflow valve (only the gastight versions 418, 428, 608, 617/417, 618,
630/430, 631/431, 853/453) for non-adhesive liquids, gas and steam for pressure
limitation and/or regulation, for protection of pumps and as bypass valve. Overflow
valves can also be used if there is counterpressure.
For details on the range of application of the individual versions please refer to the
datasheets of the manufacturer.
4
Installation and Assembly
To ensure a satisfactory operation of the valves they must be assembled in such
a way that the safety valve is not exposed to any impermissible static, dynamic or
thermal loads. The installation has to be flushed before installing the valve. If an
installation is not sufficiently cleaned or the valve is installed improperly, the valve
may leak even the first time it responds.
Appropriate safety measures must be taken at the place of installation of the valves
if the medium that discharges upon actuation of the valve can lead to direct or
indirect hazards to people or the environment.
Pressure limiting valves are to be installed vertically, if possible, and with the
bonnet pointing upward. A different installation position must be clarified with the
manufacturer.
Overflow valves 418, 428, 618, 617/417, 608, 630/430, 631/431, 853/453) can be
installed in any position. The function of the valves is guaranteed in every position.
During assembly always make sure not to apply any force when fastening
the connecting thread and not to screw it in too far, as this could otherwise
damage the seat of the valve. Do not allow sealing material such as hemp or
Teflon to penetrate into the valve.
5
Setting
The valves can be delivered with a set pressure and sealed by the factory or without set
pressure with the desired range of adjustment. Valves which have been set and sealed
by the factory are marked with the set pressure. Before changing the set pressure the
seal has to be removed. If valves are unsealed, the desired pressure can be set within the
pressure range of the spring.
In the case of ATEX versions for categories 1 and 2 and unset gastight valve versions
(t.....) the valves must be tested after setting in order to guarantee their gastightness.
Assembly and maintenance instructions - 418, 428, 608, 617/417, 618, 628, 630/430, 631/431, 853/453
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