Relief valve opening
Relief valve opening
(OP)
A high pressure air(1800 psi) valve (2") supplying air to a test fixture closes rapidly. Up stream a controller senses the pressure spike and is supposed to secure the air source by closing another valve. However, it can't react fast enough and the pressure spike lifts a relief valve (2000 psi) in between. Any ideas on how to stop this?





RE: Relief valve opening
RE: Relief valve opening
If it is a case where the normal operation is lifting the safety valve then the upstream conditions should be changed to prevent the overpressuring of the downstream system.
RE: Relief valve opening
That way it seams that you could get rid of this on-off valve and install regulating relief valve instead (it is similar to safety vlave, but designed in a manner that can survive lot of openings during operating life while maintaining precise pressure - you can find it in many catalogues).
Your safety valve should have higher setting than this regulating valve and should serve to protect against apparent malfunction - not to open all the time.
RE: Relief valve opening
If so is the downstream valve a pneumatic actuated valve (with e.g. spring to close)
if yes: Why not put the two valves on the same solenoid valve so that when one valve close the other will close too?
Best regards
Morten
RE: Relief valve opening
Slow down the valve that isolates the test ridge so the controller and air isolation valve can catch up.
Install a pilot operated relief valve and dampen the supply line to the pilot.