pressure relief valve setting
pressure relief valve setting
(OP)
I have a hydraulic cylinder with an accumulator that is pressurized with nitrogen. Does anyone know what the appropriate setting for a relief valve that is going in the accumulator. i know the accepted setting for hydraulic relief valves are around 10% over MAWP. Do pneumatic relief valves follow the same principle? 3000 psi system. any info will help. thanks.





RE: pressure relief valve setting
A pnuematic relief valve is in principle the same as a hydraulic relief valve.This being they both have a bias spring which acts directly with the supply and when pressure rises above this spring "tension" venting occurs either to atmosphere or return to tank.
RE: pressure relief valve setting
I am not saying they don't exist, it's just that they are not usually required because the gas pressure will only follow the system pressure, except when there the acculator is exposed to heat.
The system pressure is regulated by a hydraulic relief valves and the nitrogen pressure is limited by a thermal fuse.
A combination of rising heat and pressure cause the fuse to open an vent the nitrogen to remove the risk of explosion.
'hope this helps
Adrian
RE: pressure relief valve setting