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HEROSE 0681 Serie Instrucciones De Servicio página 26

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6
Operation
The maximum permissible pressure drop in the supply lines to the safety valves may not exceed
the 3% pressure difference between the response pressure and superimposed back pressure on
the safety valve.
Vibrations are to be avoided.
Check the following points prior to start-up:
All mounting and installation work are completed.
Compare the material, pressure, temperature and installation position with the layout plan for
the pipework system.
Dirt and residues have been removed from the pipeline and safety valve in order to prevent
leaks.
6.1
Liftability (manual actuation for testing)
Liftable safety valves are equipped with an appropriate device above the spring cap.
Liftable safety valves can be made to open at ≥85 % of the set pressure without aids.
Typical lifting cases are initial commissioning, after breaks in operation and functional testing; the
procedure is as follows:
20
Operating instructions
2.
Pull the lifting lever away from the spring cover
until blow-off of the operating medium is clearly
audible.
1.
Release the lifting lever again.
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