Patent ID: 11957089
Assignee: AUSCO, INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC A  F | IPC A  F

Claim 7:
8. A method for preventing leakage in a pilot-operated valve, comprising:
positioning a piston in a cavity of a valve body; wherein the cavity is disposed between an inlet and an outlet;
moving the piston into a closed position wherein the piston simultaneously contacts and rests against a first seat and a second seat of the body, wherein the first seat and second seat are spaced apart from each other at a predetermined distance without a seal between the first and second seats, wherein the piston includes a flat front face that contacts the first seat when in the closed position, and a nose extension that extends outward and away from a center portion of the front face and toward the inlet, wherein the nose extension includes a flat front surface and an opening through a center of the flat front surface thereof; and
positioning a pilot ball adjacent the piston, wherein the pilot ball is disposed in a pilot seat, and a rear surface of the piston butts against the pilot seat at a maximum open position of the piston,
wherein each of the first seat and the second seat is a seat that is a mechanical stop that prevents the piston from extending further than the closed position.