Patent ID: 7779744

Claim:
A vehicular hydraulic system comprising: a hydraulic circuit having, arranged in series and in serial order along a primary flow path, a hydraulic pump, a first hydraulic application, and a second hydraulic application; and wherein said hydraulic circuit further includes a valve having a valve body and a valve member; said valve body defining an elongate valve chamber having an axis wherein said valve member is axially slidably disposed within said chamber between a first axial position and a second axial position and sealingly partitions said chamber into a primary flow channel and a low pressure volume; said valve body further defining an inlet port in fluid communication with said primary flow channel; an outlet port in fluid communication with said primary flow channel, a low pressure port in fluid communication with said low pressure volume and a bypass port, said bypass port being disposed at an axially intermediate position with said low pressure port being disposed on one side of said bypass port and said inlet port and said outlet port being disposed on the opposing axial side of said bypass port, said bypass port being sealed from fluid communication with said valve chamber when said valve member is in said first axial position and said bypass port being in fluid communication with said primary flow channel when said valve member is in said second axial position, said valve member being axially displaced from said first axial position to said second axial position when the fluid pressure in said primary flow channel is elevated to a threshold value, and wherein said primary flow channel, said inlet port, said outlet port, said bypass port and said low pressure port are the sole fluid communication channels for fluid communication with said elongate valve chamber defined by said valve; a biasing member disposed within said low pressure volume of said valve and axially biasing said valve member toward said first axial position; a threaded member operably coupled with said biasing member, said threaded member being externally axially repositionable wherein axial repositioning of said threaded member adjusts said threshold value; and wherein said valve is operably disposed in said hydraulic circuit downstream of said pump and upstream of said first hydraulic application wherein said primary flow path extends from said hydraulic pump to said inlet port, through said primary flow channel and said outlet port of said valve to said first hydraulic application; said bypass port being in fluid communication with said primary flow path at a point downstream of said first hydraulic application and upstream of said second hydraulic application.