I am interested to hear anybody experience with cryogenic testing of TMBV at -325F, per BS6364.
The main issue i see if the valves holding the allowable leakage thru the multiple cycles at incremental pressure the test ask for.
A customer is reporting issues with operations of a BV, they have a differential pressure of about 120 PSI between the 2 seats. 1220&1100 PSI.
Should the published torques be increased when both seats are pressurized as appose to only 1 seat?
