Goetze 451 P/PL Manual Del Usuario página 8

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Safety valves are high-quality fittings which require a particularly careful handling.
The sealing surfaces are precision-machined at the seat and cone to attain the requi-
red tightness. Always avoid the penetration of foreign particles into the valve during
assembly and during the operation. The tightness of a safety valve can be impaired
when using hemp, Teflon tape, as well as through welding beads, among other things.
Also rough handling of the finished valve during storage, transport and assembly can
result in a safety valve leaking. If the safety valves are painted, make sure that the sli-
ding parts do not come into contact with the paint.
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For details on the range of application of the individual versions please refer to the
technical documentation (catalogue) of the manufacturer.
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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 dis-
charges 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.
General Notes
Range of Application
Installation and Assembly