Double piston effect seat design
Double piston effect seat design
(OP)
Could you help me on the following query.
Our ball valve seat design is one seat SPE "Upstream" and the other seat is DPE "Downstream" .
My question is the DPE allow back pressure to pass through valve even the valve in closed position in case the second seat is SPE. (See attached PEFS)
Our ball valve seat design is one seat SPE "Upstream" and the other seat is DPE "Downstream" .
My question is the DPE allow back pressure to pass through valve even the valve in closed position in case the second seat is SPE. (See attached PEFS)





RE: Double piston effect seat design
I would have thought this valve should be the other way around as the key issue is not to allow flow of anything into the pig trap.
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RE: Double piston effect seat design
Also the second valve is the same, we understand that thess valves shall be in the other way around.
But i need to know if the back pressure "pipeline pressure" down stream the valves can pass the DPE seat or not
RE: Double piston effect seat design
However if it does then the spe seat will allow fluid to pass onto the next valve without sealing
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.