Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1991-11-12
1993-04-27
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137853, 175317, 251 5, F16K 1514
Patent
active
052053253
ABSTRACT:
A flow control valve assembly is provided which, when connected to a rotatable drill string, prevents drainage of fluid from a standpipe and rotary hose of a drilling rig when fluid flow through the drill string is interrupted. The flow control valve assembly comprises a tubular body member or housing having a fluid flow passage extensive therethrough and a flow control valve supported within the fluid flow passage of the tubular body member. The flow control valve, which is a self-contained pressurized unit, is provided with an annular pressure cavity so that the flow control valve can be selectively opened and closed in response to pressure differential between the annular pressure cavity and the pressure of fluid in the fluid flow passage of the tubular body member.
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Burdick Glen M.
Nilson Robert G.
Piper Oilfield Products, Inc.
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