Patent ID: 6089248
Filing Date: 2000-07-18
Classification: E02F,F04B,F15B,Y10T

Abstract:
A flow limiter cartridge useful in a directional control valve adapted to control flow of hydraulic fluid from a load sense passage to a compensator on a fluid pump as well as to tank through either a direct return pasage or a load sense relief valve, the flow limiter cartridge comprising:a cylindrical valve body with a radially opening load sense port, an axially extending inlet port connected to an axially opening outlet port adapted to connect to the compensator on the fluid pump, and an axially disposed return port for returning hydraulic fluid to tank;a valve within the cylindrical valve body for connecting the load sense passage to the compensator on the pump and connected to the direct return passage, the valve including a pressure controlling orifice communicating with the direct return passage via the axially disposed return port;a pressure responsive bias urging the valve to connect the load sense passage to the return passage with a selected force; andthe valve having a reaction surface for overcoming the bias upon the pressure from the load sense passage exceeding the selected force of the pressure responsive bias to thereby close communication between the load sense passage and return passage, whereby the fluid in the load sense passage is throttled through the pressure controlling orifice to the return.