Patent ID: 11906986
Assignee: PARKER HANNIFIN EMEA S.À.R.L.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 11:
12. A hydraulic actuator control circuit for controlling supply and discharge of hydraulic fluid to and from a hydraulic actuator, the hydraulic actuator control circuit comprising:
the counter pressure valve arrangement according to claim 1,
a hydraulic pump,
a tank for storing low pressure hydraulic fluid,
a hydraulic actuator,
a control valve arrangement having at least a first work port (A) fluidly connected to a first flow port of hydraulic actuator, an inlet port fluidly connected to an outlet port of the hydraulic pump, and a discharge port fluidly connected to the counter pressure regulating port of the counter pressure valve arrangement,
wherein the control valve arrangement is configured for controlling a direction of supply of hydraulic oil to the hydraulic actuator and a direction of discharge of hydraulic oil from the hydraulic actuator,
wherein the counter pressure regulating port of the counter pressure valve is fluidly connected to the discharge port of the control valve arrangement via the return line,
wherein the tank port of the counter pressure valve is fluidly connected to the tank, and
wherein the pump port of the counter pressure valve is fluidly connected to a source of pressurised hydraulic fluid.