Hydraulic system having a backpressure control valve

摘要

A hydraulic system for a machine is disclosed. The hydraulic system has a source of pressurized fluid, a fluid actuator, and a tank. The hydraulic system utilizes a directional control valve to direct flow between the source, the actuator, and the tank. The hydraulic further utilizes a variable backpressure control valve to control the system backpressure.

主权项

1. A hydraulic system, comprising:
a source of pressurized fluid; a tank; a hydraulic actuator; a first valve configured to selectively fluidly communicate the source with the actuator; a second valve disposed between the first valve and the tank, the second valve being movable between a flow passing position and a flow blocking position, wherein the second valve is biased toward the flow passing position by a pressure signal taken between the first valve and the second valve, and the second valve is either biased toward the flow passing position or the flow blocking by a pilot pressure signal; and a dampening orifice disposed between the second valve and the tank.