Patent ID: 8523537
Filing Date: 2013-09-03
Classification: F04B

Abstract:
1. A dual-pump fluid distribution system capable of switching between a single-pump mode and a dual-pump mode depending on a fluid flow demand, the dual-pump fluid distribution system comprising: a first pump having an inlet and an outlet, the first pump configured to supply a first flow of fluid; a second pump having an inlet and an outlet, the second pump configured to supply a second flow of fluid; and a bypass flow valve having a valve member, a biasing element, and a four-way hydraulic bridge, the bypass flow valve configured to initiate the switch between single-pump mode and the dual-pump mode based on the fluid flow demand; wherein the bypass flow valve is configured such that a position of the bypass flow valve member relative to the four-way hydraulic bridge operates a pump selector valve; and wherein the pump selector valve has a valve member, a biasing element, and a pressure switching port, the pump selector valve configured such that a position of the pump selector valve member determines whether the second flow of fluid is combined with the first flow of fluid, and further comprising: a variable pressure regulator that includes a first port coupled to the second pump outlet, a second port coupled to the second pump inlet, and a third port directly coupled to the pump selector valve pressure switching port, and a actuation supply unit disposed between the second pump outlet and the pump selector valve, the actuation supply unit configured to provide a pressurized flow of fluid.