Patent ID: 7252068

Claim:
A servo lockout valve for use in a servo lockout system coupled to a fuel pump, comprising: a body having a first fluid inlet, a first fluid outlet, a second fluid inlet, and a second fluid outlet, the first fluid inlet and the first fluid outlet configured to communicate with the servo lockout system, and the second fluid inlet and second fluid outlet configured to communicate with the fuel pump; and a pressure activated piston slideably positioned within the body, the piston including an outer surface, an annular passage, and an orifice, the annular passage and the orifice formed on the piston outer surface, wherein the piston is configured to respond to fuel pressure entering the second fluid inlet to move the piston between a first position and a second position based on the fuel pressure, wherein in the first position the first fluid inlet and the first fluid outlet are not in fluid communication and the second fluid inlet, the orifice, and the second fluid outlet are in fluid communication, and in the second position the first fluid inlet, the annular passage, and the first fluid outlet are in fluid communication and the second fluid inlet and the second fluid outlet are in fluid communication.