Ball valve having a non-integral upstream seat and at least one

Details Ball valve having a non-integral upstream seat and at least one Ball valve having a non-integral upstream seat and at least one

1996-10-15

2000-05-23

Fox, John

Valves and valve actuation

Rotary valves

Ball valve

251174, 13724622, F16K 520

Patent

active

060657367

ABSTRACT:
A ball valve for controlling the flow of a fluid is provided having primary and secondary annular sealing seats which are disposed in the body cavity for the purpose of providing a seal between the valve body and a first hemisphere of a ball. An annular leak detection channel is defined between the primary and secondary annular sealing seat for collecting fluid that leaks past the primary sealing seat. A purge is defined in the valve body extending from the channel to the exterior of the valve body, for establishing fluid through-flow and for draining fluid away from the secondary sealing seat that collects in the channel. A third annular sealing seat sealingly engages a second hemisphere of the ball.

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Dean Chisholm, Grove B-5 Ball Valve Sealant Evaluation, Dec. 30, 1992, p. 1 .

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