Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1995-11-28
1998-05-26
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
1371152, 13711528, G05D 701, F16K 1118
Patent
active
057552517
ABSTRACT:
An unloader valve for a high pressure pumping system is disclosed. The unloader valve diverts fluid back to the pump inlet when the discharge line is blocked, and directs flow to the pump outlet when the line is unblocked. The unloader valve includes a valve body with a central cavity, a bypass check valve which also functions as a pressure relief valve, a shuttle positioned in the central cavity and a discharge check valve. A spring in the bypass check valve holds the bypass check valve closed while the system is in the spray mode. The discharge check valve closes when the line is blocked, and the line pressure is trapped between the discharge check valve and the spray gun. When the gun is reactivated, the pressure trapped behind the discharge check valve moves the shuttle forward, which opens the bypass valve.
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Farrar Jennifer K.
GP Companies, Inc.
Hepperle Stephen M.
Lervick Craig J.
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