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1. A loop flushing valve assembly for use in connection with a hydraulic circuit having a first port in communication with a first fluid side, a second port in communication with a second fluid side, and an outlet passage connected to the first port, the second port and a sump, the loop flushing valve assembly comprising:
a first valve seat disposed between the first port and the outlet passage, and a second valve seat disposed between the second port and the outlet passage; a first valve subassembly disposed in the first port and a second valve subassembly disposed in the second port, wherein the first valve subassembly and the second valve subassembly each comprise:
a main port plug;a fluid passage plug having a first end and a second end, and a fluid passage extending through the fluid passage plug from the first end to the second end;a spring providing a spring force and engaged to the fluid passage plug;a valve body having a proximal end engaged to the second end of the fluid passage plug and a distal seat end, and a bore extending through the valve body, wherein the valve body is axially moveable from a closed position where the distal seat end is in contact with its respective valve seat to prevent fluid flow from the respective fluid side to the outlet passage, to an open position where the distal seat end is not in contact with its respective valve seat, and the valve body is biased to the closed position by the spring; anda poppet partially disposed in the bore of the valve body, the poppet having a first contact end extending out through the distal seat end of the valve body, a second end, and a shoulder formed adjacent to the second end; wherein, when the pressure in the first fluid side exceeds the pressure in the second fluid side, the first valve subassembly poppet will axially move towards the second valve subassembly poppet, and when a pressure differential between the first fluid side and the second fluid side is sufficient to overcome the spring force of the second valve subassembly spring, the first valve subassembly poppet will cause the second valve subassembly valve body to move to its open position; and wherein, when the pressure in the second fluid side exceeds the pressure in the first fluid side, the second valve subassembly poppet will axially move towards the first valve subassembly poppet, and when the pressure differential between the second fluid side and the first fluid side is sufficient to overcome the spring force of the first valve subassembly spring, the second valve subassembly poppet will cause the first valve subassembly valve body to move to its open position. |
