You may want to look at a Masoneilan V-Log or Lincoln log control valve that would limit the ultimate velocity to a manageable level. Joe Shada at 508-586-4800 or jshada@masoneilan.com can help if your interested.
Most trunnion ball valve designs have pressure energized upstream seals.
For a floating ball type valve, the ball is pushed downstream with increasing pressure differential. For an upstream sealing trunnion valve, pressure differential pushes the upstream seat into the ball. Both designs have...
Bubble tight means no bubbles for the duration of the test. Not the same as class VI which allows x number of bubbles per minute depending on the size of the valve. Water media doesn't count as a bubble test. Water infers a liquid which makes drops. Not bubbles.
I agree with cranekiran. The term bubble tight by itself doesn't mean much more than a gas leak test. Normally there is a following description like: seat leakage is bubble tight against 60psig Helium, or for the case of B16.34 type valves air/Nitrogen media is often assumed. If there is no...
