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4
Installation and Assembly
Spring-loaded safety valves are to be installed with the spring bonnet pointing
vertically upward. To ensure a satisfactory operation of the safety valves they must
be installed in such a way that the safety valve is not exposed to any impermissible
static, dynamic or thermal loads. Appropriate protection devices must be applied if
the medium that discharges upon actuation of the valve can lead to direct or indirect
hazards to people or the environment. Always pay attention to possible fumes
discharging from the relief bores in the spring bonnet.
Supply
Supply connection pieces for safety valves are to be kept as short as possible and
are to be designed in such a way that there can be no pressure loss greater than
max. 3% of the response pressure.
Removal of condensate discharge
In the event of possible condensate formation the pipes or the valves themselves
(in flanged version) must be fitted at their lowest point with a continuously
operating condensate discharge device. Hazard-free removal of the condensate
or medium discharge must be ensured. The body, pipes and silencers must be
protected against freezing.
Blowing-off pipe / backpressure
The blow-off pipe of the safety valves must be designed to ensure that the required
mass flow can be discharged pressure-free during the blowing-off process. In
safety valves with metal bellows a backpressure of up to max. 4 bar has no impact
on the response pressure of the safety valve.
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Operation/maintenance
The operating pressure of the plant is to be least 5% lower than the closing pres-
sure of the safety valve. In this way, the valve can satisfactorily close again after
blowing off. 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
cleaining 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.
Depending on the version, lifting is either carried out by means of a knurled nut
above the spring bonnet (Fig. a) which is turned counterclockwise (afterwards the
knurled nut has to be turned back to the stop) or by actuating the lifting lever on the
upper part of the valve (Fig. b). For delivery purposes the lifting lever is blocked by
means of strap which has to be removed for actuating the lifting device.
Assembly and maintenance instructions - 851/451, 852/452/352, 652, 861/461, 420, 460
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