E - Fixed Constructions – 03 – B
Patent
E - Fixed Constructions
03
B
137/77
E03B 5/00 (2006.01) E03B 11/00 (2006.01) F04B 49/00 (2006.01) F04B 49/08 (2006.01)
Patent
CA 1104033
ABSTRACT A variable displacement fluid pump system is provided having a pressure and flow compensated control system with con- stant torque and viscosity sensing over-ride acting on the control system. The system includes a viscosity sensing means receiving fluid from the pump and acting on the control means to over-ride the control means to reduce the pump displacement when the viscosity of fluid in the pump exceeds a predetermined value, a pressure sensing means receiving fluid from the pump acting on the control means to over-ride the control means and reduce pump displacement when the pressure in the system exceeds a predetermined value, at least one pressure compensated work port valve receiving pressure fluid from said pump and a variable by-pass valve receiving fluid from the pump not required by the pressure compensated work port valves to variably by-pass excess fluid from said pressure compensated valve and acting on said control means to vary the displacement of said variable displacement pump to satisy the fluid require- ments of said pressure compensated valve above a minimum established flow rate.
297266
Byers James O. Jr.
Locher Donald A.
Commercial Shearing Inc.
Smart & Biggar
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