US 11,957,089 B2
Zero leak pilot operated valve having two seats
Werner Buhler, Woodside, NY (US); and Kenneth Bram, Huntington, NY (US)
Assigned to AUSCO, INC., Port Washington, NY (US)
Filed by AUSCO, INC., Port Washington, NY (US)
Filed on Oct. 26, 2020, as Appl. No. 17/080,734.
Application 17/080,734 is a continuation of application No. 12/399,695, filed on Mar. 6, 2009, granted, now 10,813,296.
Claims priority of provisional application 61/034,384, filed on Mar. 6, 2008.
Prior Publication US 2021/0251152 A1, Aug. 19, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. F16K 31/383 (2006.01); A01G 7/02 (2006.01); A01G 13/06 (2006.01); F16K 3/26 (2006.01)
CPC A01G 7/02 (2013.01) [A01G 13/06 (2013.01); F16K 3/267 (2013.01); F16K 31/383 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A valve, comprising:
an inlet and an outlet;
a body including a first seat and a second seat, 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;
a cavity in the body;
a piston positioned in the cavity, wherein the piston simultaneously contacts and rests against the first seat and the second seat when moving into a closed position, 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
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.