Abstract: A hydraulic valve having a housing with a piston located in a bore. The piston has a passage which connects an inlet chamber with an outlet chamber. A piston responds to a pressure differential between the inlet chamber and outlet chamber pressure and an outlet pressure by moving in the bore. A valve carried by the piston engages a needle to open communication through the passage and communicate fluid from the inlet chamber toward the outlet chamber. The needle extends from a core of an electromagnet, which responds to move the valve off a seat and open communication through the passage in opposition to a spring which urges the valve toward the seat and correspondingly control communication through the passage.