# US 2022/0034408 A1 · Gate valve

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- Number: US 2022/0034408 A1
- Document ID: US20220034408A1
- Status: Published application
- Kind: A1
- Application number: 17/312,118
- Filed: 2019-12-13
- Published: 2022-02-03
- Earliest claimed: 2018-12-14
- Assignees: Kitz Corporation
- Applicants: Kitz Corporation
- Inventors: Tetsuya KOBAYASHI; Yuri KOBAYASHI
- Web page: https://patentgrep.com/patent/US20220034408A1

## CPC

- F16K 3/12: with wedge-shaped arrangements of sealing faces
- F16K 31/46: for remote operation
- F16K 3/0254: {being operated by particular means}
- F16K 27/047: {with wedge-shaped obturating members}
- F16K 31/50: with screw-spindle {or internally threaded actuating means}
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A wedge-shaped gate valve with a branching part formed to be open in a direction orthogonal to an inner flow path of a valve box having a coupling part on both sides, and a valve disk ascends and descends from the branching part via a valve stem to open and close an annular valve seat surface. At a boundary between the coupling part and the branching part, a reinforcing thickened part having a cylindrical, cone, or truncated cone shape with a diameter gradually reducing from the branching part toward the coupling part side is provided, and the thickened part is formed by taking, as an outer shape, a cylinder, a cone, or a truncated cone with an axis P2 that is eccentric from a center line P1 of the flow path to the branching part side and is parallel to or crossing the center line P1 as a rotation axis.

## Claims

### Claim 1

A gate valve with a branching part formed to be open in a direction orthogonal to an inner flow path of a valve box having a coupling part on each of both sides, in which a valve disk ascends and descends from this branching part via a valve stem to open and close an annular valve seat surface in the valve box, wherein, at a boundary between the coupling part and the branching part, a reinforcing thickened part having a substantially cylindrical shape or a substantially cone shape or substantially truncated cone shape with a diameter gradually reducing from this branching part toward the coupling part side is provided, and this thickened part is formed by taking, as an outer shape, a cylinder, a cone, or a truncated cone with an axis which is eccentric from a center line of the flow path to the branching part side and is parallel to or crossing the center line of the flow path taken as a rotation axis.

### Claim 2 (depends on 1)

The gate valve according to claim 1, wherein the rotation axis takes a position where a base of the cone and the center line of the flow path cross as a base point and is eccentric from this base point to the branching part side at a predetermined distance.

### Claim 3 (depends on 2)

The gate valve according to claim 2, wherein the rotation axis is eccentric to the branching part side so that a point of contact of the rotation axis and the valve seat surface is at a distance of 5 mm to 10 mm from the center line of the flow path.

### Claim 4

A gate valve with a branching part formed to be open in a direction orthogonal to an inner flow path of a valve box having a coupling part on each of both sides, in which a valve disk ascends and descends from this branching part via a valve stem to open and close an annular valve seat surface in the valve box, wherein, at a boundary between the coupling part and the branching part, a reinforcing thickened part having a substantially cylindrical shape or a substantially cone shape or substantially truncated cone shape with a diameter gradually reducing from this branching part toward the coupling part side is provided, and this thickened part is formed so as to, while maintaining a shape with a material thickness on a branching part side larger in a sectional direction than a valve disk accommodating part opposite thereto, have the material thickness gradually thinner at a predetermined rate as proceeding from a base side toward an upper surface side of the cone along a peripheral surface.