Goetze 418 Instructions D'entretien page 8

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Overflow valves and pressure limiting 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 required tightness. Always avoid the penetration of foreign
particles into the valve during assembly and during the operation. The tightness of a
pressure limiting / overflow 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 valve leaking.
If the valves are painted, make sure that the sliding parts do not come into contact
with the paint.
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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, 608/609, 610, 617/417, 618/619)
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 such as materials
and performance data please refer to the technical documentation (Homepage) of the
manufacturer.
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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.
General Notes
Range of Application
Installation and Assembly