cavity pressure relieve for a 2" floater ball valve
cavity pressure relieve for a 2" floater ball valve
(OP)
even thought the seats are self-relieving but the customer is requesting a direct discharge relieve port in the body cavity that release to the upstream, i never seen this. how this design will look like ? where the tap will be located and how to release to upstream?





RE: cavity pressure relieve for a 2" floater ball valve
On the other hand. A trunnion ball valve has spring loaded seats and the ball is held rigidly against lateral movement by the trunnion bearings. Putting a PSV in the body bleed on a trunnion ball valve can be a good idea (thermal relief if nothing else), but going back to the upstream side is a bit iffy (remember, the PSV you are likely considering is a non-pilot valve that senses the difference between inlet pressure and exhaust pressure so changes in upstream pressure change the "setpoint").
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: cavity pressure relieve for a 2" floater ball valve
I may be getting the wording they used wrong but they could be implying a port drilled directly into one side of the ball itself. This could allow for isolation in one direction then function to some degree as a restriction orifice to limit flow in the other direction. Not saying this would be the recommended way to address what they may want but there could be some reasoning to what they're requesting. Find out what they're actually looking for regarding operation/performance and then work on a solution from there.
Thanks,
Ehzin
RE: cavity pressure relieve for a 2" floater ball valve
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist