Gate valve

Patent metadata

Field	Value
Publication number	US-11486499-B2
Application number	US-201917312118-A
Country	US
Kind code	B2
Filing date	Dec 13, 2019
Priority date	Dec 14, 2018
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

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 P 2 that is eccentric from a center line P 1 of the flow path to the branching part side and is parallel to or crossing the center line P 1 as a rotation axis.

First claim

The invention claimed is:

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.

2. 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.

3. 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.

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.

Assignees

• Kitz Corp

Inventors

• Kobayashi Tetsuya
• Kobayashi Yuri

Classifications

• F16K31/50

  with screw-spindle {or internally threaded actuating means} · CPC title

• F16K3/12 Primary

  with wedge-shaped arrangements of sealing faces · CPC title

• F16K27/047

  with wedge-shaped obturating members · CPC title

• F16K31/46 Primary

  for remote operation · CPC title

• F16K3/0254

  being operated by particular means · CPC title