i have customer asking me about steam isolation ball valve .
i am quoating 2'',3'',4'' #150 rating trunion ball valve for 450kpa.
is there any special requirement for trim material or which is the best suited trim material?
we have floater valves with all different sizes from 2'' to 10'',different classes from 150 to 2500.
now the body-cap material is casting WCB or LCC.
we have a problem since long time.
we found lots of valves leak during Low pressure testing.
almost all leaks are from body-cap joint.
how i can...