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

Claim 18:
19. A counter pressure valve arrangement for controlling a pressure level of a hydraulic fluid in a return line from a hydraulic actuator arrangement, the counter pressure valve arrangement comprising a counter pressure valve having:
a moveable valve member,
a counter pressure regulating port configured for being connected to the hydraulic actuator arrangement via the return line,
a tank port configured for being connected to a tank or low pressure reservoir for storing low pressure hydraulic fluid, and
a pump port configured for being connected to a source of pressurised hydraulic fluid,
wherein a first position of the valve member effects fluid communication between the pump port and the counter pressure regulating port for supplying pressurised hydraulic fluid to the return line,
wherein a second position of the valve member effects fluid communication between the counter pressure regulating port and the tank port for discharging hydraulic fluid from the return line to the tank, and
wherein the counter pressure valve is proportional, solenoid-controlled, direct-operated control valve having a first solenoid acting directly or indirectly on a first axial end of the valve member for shifting the directional control valve to, or at least towards, the first position.