3 replies to this topic

[Ullhas11]

 MS-01-176.PDF   1.54MB   17 downloadsI have been going through online check valve manual. I have found two technical terms in that. Nominal cracking pressure and cracking pressure range. I know that cracking pressure is that pressure at which first indication of flow occur. This means that cracking pressure is single value, then why does cracking pressure range is specified.

I have attached technical specification file for your reference.

Thank you in advance

Edited by Ullhas11, 30 August 2017 - 01:57 AM.

[fallah]

I have been going through online check valve manual. I have found two technical terms in that. Nominal cracking pressure and cracking pressure range. I know that cracking pressure is that pressure at which first indication of flow occur. This means that cracking pressure is single value, then why does cracking pressure range is specified.

I have attached technical specification file for your reference.

Thank you in advance

 

Nothing attached...!

[Ullhas11]

I have attached manual of check valve. 

[VeryProfessionalEngineer]

I'm wondering the same. My guess is that it has something to do with this statement: "For valves not actuated for a period of time, initial cracking pressure may be higher than the set cracking pressure.", but if you have a cracking pressure of 1/3 psi, I would hope the cracking pressure wouldn't go all the way to 3 psi as indicated. I don't suspect check valves are tuned to maintain absolute perfection, but that seems like a big spread, at least for the lowest pressure offered.