Limit of balance bellows relief valves 1

[mrtangent2]

Dear all,

i like to confirm my understanding of the limit for balanced bellows relief valves.. can you get a valve with a set pressure and balanced bellows below 1 barg?

i Dont believe so but i wanted to check

thanks in advance

 

[The Obturator]

It's not always possible from any manufacturers standard range, especially with bellows.

What is the actual set pressure?

Some can modify an existing design by having lightweight internals and/or requiring the PRV to be installed (and tested) upside down.

You state bellows presumably because of back pressure?

Size of PRV is a big influencer too, as is the tolerance of setting so low a pressure.

What is your application? fluid set/back pressure etc.



*** Per ISO-4126, the generic term 'Safety Valve' is used regardless of application or design ***

*** 'Pressure-relief Valve' is the equivalent ASME/API term ***