Patent ID: 11913480
Assignee: DANFOSS A/S
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A hydraulic circuit comprising:
(a) an actuator having first and second ports;
(b) a metering valve assembly for controlling hydraulic flow into and out of the first and second ports; and
(c) an isolation valve assembly located between the actuator and the metering valve assembly, the isolation valve assembly including a first inlet port configured for fluid communication with a pressure source of the hydraulic circuit, a second inlet port configured for connection with a reservoir of the hydraulic circuit, and a pressure sensing port configured for connection with a pressure sensor;
(d) wherein the isolation valve assembly is movable between a first position, in which fluid flow between the metering valve and the actuator is enabled, and a second position, in which fluid flow between the metering valve and the actuator is blocked, and wherein the isolation valve assembly is spring biased into the second position;
(e) wherein when the isolation valve assembly is moved to one of the first and second positions, the first inlet port and the pressure sensing port are placed in fluid communication with each other, and wherein when the isolation valve assembly is moved to the other of the first or second position, the second inlet port and the pressure sensing port are placed in fluid communication.