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General Notes
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. 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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Range of Application
For details on the range of application of the individual versions please refer to the
datasheets of the manufacturer. The resistance of the listed metallic and non-metallic
materials coming into contact with the medium must be checked by the operating
company in each case with the flow medium and/or cleaning agent used. The equip-
ment operator shall ensure the low-vibration, quasistatic operation of the valve. The
equipment operator shall take appropriate measures that vibration of the piping is
absorbed, if required.
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Installation and Assembly
Spring-loaded safety valves are to be installed with the spring bonnet pointing verti-
cally upward. Horizontal installation is also permitted, taking condensate derivation
into account. To guarantee perfect function of the valves, they must be mounted so
that no unauthorized static, dynamic or thermal loads can take effect. Piping may
only be connected forcefree and torque-free during operation. Suitable protective
measures must be taken if escaping medium can result in direct or indirect risk to
persons or the environment if the body responds. Medium escaping through open
spring bonnets must also be considered.
Supply line
Supply line supports for safety valves should be as short as possible and are to be
designed so that no higher pressure losses than max. 3% of the response pressure
can occur at full valve load.
Assembly and maintenance instructions - 455, 355, 255 | Version: 04/2024 · V03
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