Set value Check
Set value Check
(OP)
Hi,
Has anyone ever heard of a "Set Value Check" for check valves?
Has anyone ever heard of a "Set Value Check" for check valves?
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RE: Set value Check
Some checkvalves, mostly with weightload and arm, or/and spring closing will have a possibillity to adjust and set the opening force (and hence opposite the closing force) at a certain value. Could this be the explanation?
RE: Set value Check
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RE: Set value Check
stanier, it's a request on a Hitachi data sheet. Talking to Hitachi, they even do not know what it is....
We just stated N/A.
RE: Set value Check
My only other thought, would they possibly be talking about a cracking pressure verification test? All spring loaded check valves have an allowable variance + or - 20% for example. A cracking pressure verification test will tell you exactly where within that allowable range the check valve is cracking.
nmiller127
RE: Set value Check
Thanks for the idea, I was thinking about the same, but check valves of different designs in operation show cracking pressures of approximately 105 to 110% of the operating or closing pressure. (Rule of thumb)
This is a known rule of thumb to piping engineers which normally is not of any concern.
Hitachi finally accepted our N/A statement.