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Self Relieving Seats

Metso, Kitz, Habonim and many others have self-relieving seats for cavity pressure
relieving without resorting to punch a hole on one side of the ball.

One design, showed above, may allow valve to leak when line was over-pressurized
The outer supporting surface won't allow the ball to move downstream any further
and flexible internal sealing surface shall continue to flex and allow valve to leak

MBV can design and manufacture real self-relieving seats for venting cavity trapped
pressure, such as for jet fuel or ammonia service.

Consult MBV for more information
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