Patent ID: 8607559
Filing Date: 2013-12-17
Classification: F15B

Abstract:
1. A method for actuating a bypass control valve assembly of a fluid system, the method comprising: receiving a first input signal at an electronic control unit, the first input signal being related to an active position of a directional control valve that is in fluid communication with a fluid pump and a fluid actuation device, wherein the directional control valve has a neutral position that provides fluid communication between a fluid inlet port of the directional control valve and a fluid outlet port of the directional control valve; receiving a second input signal at the electronic control unit, the second input signal being related to rotational speed of the fluid pump; comparing the second input signal to a limit; and actuating a drain valve of a bypass valve assembly so that fluid communication between the fluid pump and a fluid reservoir through the bypass valve assembly is blocked when the directional control valve is in the active position and the second input signal is less than the limit; wherein the bypass valve assembly includes a poppet valve assembly having a spring cavity, the drain valve providing selective fluid communication between the spring cavity and the fluid reservoir, wherein an electronic signal from the electronic control unit actuates the drain valve to a closed position so that a poppet valve of the poppet valve assembly is fluidly locked in a seated position.