Fluid handling – Processes
Patent
1990-06-06
1991-02-26
Nilson, Robert G.
Fluid handling
Processes
251175, 251215, 251228, 251248, 251283, 251308, F16K 122
Patent
active
049954148
ABSTRACT:
A method for opening a sealingly closed, balanced-torque butterfly valve, and apparatus adapted for use with the method. The butterfly valve (40) comprises a valve plate (42) having a peripherally disposed seal (162) seated in an annular recess (160). A flow passage (164, 166) is formed in the valve plate (42) and fluidically connects the recess (160) to the downstream-facing surface of the valve plate. A check valve (168) is disposed in the flow passage (164, 166) to alternately block or permit flow therethrough. Outwardly directed pressure exerted by high-pressure fluid on the seal (162) is relieved by opening the check valve (168) in reponse to a slight translational movement of the valve plate (42) relative to a rotatable shaft (72) which pivotally connects the valve plate to the duct (146).
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Allied-Signal Inc.
Black Joseph R.
McFarland James W.
Nilson Robert G.
Walsh Robert A.
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