Combination sealing arrangement for rotary ball valve
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United States of America Patent
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-
Dec 13, 2016
Grant Date -
Nov 10, 2016
app pub date -
Jul 13, 2015
filing date -
May 4, 2015
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A rotary ball valve with an improved sealing arrangement, comprising of a valve body and a rotary ball, the rotary ball valve has a plurality of combination sealing arrangement comprising of a polarized combination cavity having a non-parallel slot and an extended groove, an add-on sealing ring and a compatible seat ring having a plurality of non-parallel concentric surfaces, when assembled. The compatible seat ring has a compatible profile so as to create a positive isolation by a surface contact between the add-on sealing ring and the extended groove and create another positive isolation by a surface contact between the add-on sealing ring and the compatible seat ring. The positive isolation prevents leakage during thermal cycling, pressure variations. The non-parallel slot and the compatible sealing ring therein prevents dislodgement of the seat ring; even in double block and bleed condition.
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