Goetze 642 Instrucciones De Servicio, Montaje Y Mantenimiento página 7

4
Installation and Assembly
Spring-loaded safety valves are to be installed with the spring bonnet pointing
vertically upward in line with the direction of the arrow.
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 condensation the pipes or the valves themselves must be
fitted at their lowest point with a continuously operating condensate discharge de-
vice. 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.
5
Operation/maintenance
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 characteristics safety valves require
maintenance, just like any other technical device. The maintenance intervals are
determined by the operator in dependence of the operating conditions.
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 af-
ter 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
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.
Lifting is by actuating the lifting lever on the upper part of the valve (Fig. a). For
delivery purposes the lifting lever is blocked by means of a strap which has to be
removed for actuating the lifting device.
Prior to removal make sure that the safety valve is not under pressure.
Assembly and maintenance instructions - 642, 6420, 645, 6450 www.goetze-armaturen.de