US 12,404,938 B2
Extended seat for a gate valve
Peng Stephen Zhao, Houston, TX (US)
Filed by Severe Service Valve Inc., Houston, TX (US)
Filed on Feb. 8, 2024, as Appl. No. 18/436,813.
Prior Publication US 2025/0257807 A1, Aug. 14, 2025
Int. Cl. F16K 3/20 (2006.01); F16K 3/02 (2006.01); F16K 27/04 (2006.01)
CPC F16K 3/20 (2013.01) [F16K 3/0227 (2013.01); F16K 27/044 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gate valve, comprising:
a valve body forming a valve chamber within the valve body and forming a fluid passageway that extends through the valve body and transversely intersecting the valve chamber, wherein the valve chamber includes a first circumferential seat pocket around the fluid passageway facing into the valve chamber in a first direction and a second circumferential seat pocket around the fluid passageway facing into the valve chamber in a second direction opposite the first direction;
a first body bushing having a first end received in the first circumferential seat pocket, a second end extending in the first direction into the valve chamber, and an opening through the first body bushing that aligns with the fluid passageway;
a second body bushing having a first end received in the second circumferential seat pocket and a second end extending in the second direction into the valve chamber, and an opening through the second body bushing that aligns with the fluid passageway;
a first seat having first and second ends, first and second opposing sides extending between the first and second ends of the first seat, a first seat opening that extends through the first seat between the first and second opposing sides of the first seat in a first region of the first seat at the first end of the first seat, a first sealing surface formed by a second region of the first seat at the second end of the first seat, and a circumferential recess around the first seat opening on the second side of the first seat, wherein the second end of the first body bushing is received in the circumferential recess around the first seat opening to align the first seat opening with the fluid passageway, and wherein the first side of the first seat is flat;
a second seat having first and second ends, first and second opposing sides extending between the first and second ends of the second seat, a second seat opening that extends through the second seat between the first and second opposing sides of the second seat in a first region of the second seat at the first end of the second seat, a second sealing surface formed by a second region of the second seat at the second end of the second seat, and a circumferential recess around the second seat opening on the second side of the second seat, wherein the second end of the second body bushing is received in the circumferential recess around the second seat opening to align the second seat opening with the fluid passageway, and wherein the first side of the second seat is flat; and
a gate having first and second ends, first and second opposing flat sides extending from the first end to the second end, a gate opening that extends through the gate between the first and second opposing flat sides of the gate in a first region of the gate at the first end of the gate, and a sealing surface of the gate formed by a second region of the gate at the second end of the gate, wherein the first flat side of the gate slidingly engages the first flat side of the first seat and the second flat side of the gate slidingly engages the first flat side of the second seat, and wherein the gate is axially moveable within the valve chamber between an open position where the gate opening is aligned with the first and second seat openings and a closed position where the sealing surface of the gate is aligned with the first and second seat openings to close off the fluid passageway and the gate opening is aligned with the first sealing surface of the first seat and the second sealing surface of the second seat to close off both sides of the gate opening.