Control valve

Patent metadata

Field	Value
Publication number	US-10895326-B2
Application number	US-201816492697-A
Country	US
Kind code	B2
Filing date	Mar 16, 2018
Priority date	Mar 17, 2017
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A control valve includes a valve housing, a joint member, a valve body, and a sealing tube member. A seal ring, which receives a liquid pressure inside the valve housing and comes into tight contact with the joint member and the sealing tube member, is provided between the joint member and the sealing tube member. The sealing tube member has a biasing pressure receiving surface receiving the liquid pressure inside the valve housing in a direction along a direction of the valve body. The seal ring is disposed at a position where the sealing tube member is not pressurized in the direction of the valve body. An area of a valve sliding contact surface is set to be larger than an area of the biasing pressure receiving surface.

First claim

The invention claimed is:

1. A control valve comprising:
a valve housing which has an inflow port for causing a liquid to flow in from outside and a discharge port for discharging a liquid that has flowed in to the outside;
a joint member which is joined to a circumferential edge of the discharge port;
a valve body which is rotatably disposed inside the valve housing and has a circumferential wall portion in which a valve hole for communication between the inside and the outside is formed; and
a sealing tube member in which one end side communicates with the discharge port, and a valve sliding contact surface slidably abutting an outer surface of the circumferential wall portion at a position where at least a part of the valve body overlaps a rotation path of the valve hole is provided on the other end side,
wherein the valve body allows an outflow of a liquid to the discharge port from an nner region of the circumferential wall portion hen at a rotation position where the valve hole and the sealing tube member are allowed to communicate with each other, and the valve body controls or blocks an outflow of a liquid to the discharge port from the inner region of the circumferential wall portion when at a rotation position where the valve hole and the sealing tube member are inhibited from communicating with each other,
wherein a seal ring which receives a liquid pressure inside the valve housing and comes into tight contact with the joint member and the sealing tube member provided between the joint member and the sealing tube member,
wherein the sealing tube member has a biasing pressure receiving surface receiving the liquid pressure inside the valve housing in a direction along a direction of the valve body,
wherein the seal ring is disposed at a position where the sealing tube member is not pressurized in the direction of the valve body, and
wherein an area of the valve sliding contact surface is set to be larger than an area of the biasing pressure receiving surface.

2. The control valve according to claim 1 ,
wherein the joint member includes a tube portion which protrudes from a part of the discharge port in the direction of the valve body and slidably holds an inner circumferential surface of the sealing tube member,
wherein an annular groove portion is formed on an outer circumferential surface of the tube portion,
wherein a tonic seal accommodation space is provided between the groove portion of the tube portion and the inner circumferential surface of the sealing tube member,
wherein the seal ring which comes into tight contact with a circumferential surface of the groove portion and the inner circumferential surface of the sealing tube member is accommodated in the seal accommodation space,
wherein a liquid pressure chamber, into which the liquid pressure inside the valve housing is introduced, is formed between the seal ring and a surface of the groove portion on a side away from the valve body in the seal accommodation space, and
wherein a surface of the sealing tube member on a side away from the valve body constitutes the biasing pressure receiving surface.

3. The control valve according to claim 1 ,
wherein the joint member includes
a small diameter inner circumferential surface which slidably holds the sealing tube member,
a large diameter inner circumferential surface which is formed to have an increased diameter in a stepped state from an end portion of the small diameter inner circumferential surface on a side close to the valve body, and
a stepped surface which connects the small diameter inner circumferential surface and the large diameter inner circumferential surface to each other,

wherein the sealing tube member includes
a small diameter outer circumferential surface which is slidably fitted into the small diameter inner circumferential surface,
a large diameter outer circumferential surface which is formed to have an increased diameter in a stepped state from an end portion of the small diameter outer circumferential surface on a side close to the valve body, and
a connection surface which connects the small diameter outer circumferential surface and the large diameter outer circumferential surface to each other,

wherein a tonic seal accommodation space surrounded by the large diameter inner circumferential surface and the small diameter outer circumferential surface is provided between the stepped, surface of the joint member and the connection surface of the sealing tube member,
wherein the seal ring which comes into tight contact with the large diameter inner circumferential surface arid the small diameter outer circumferential surface is accommodated in the seal accommodation space,
wherein a liquid pressure chamber, into which the liquid pressure inside the valve housing is introduced, is formed between the, seal ring and the connection surface of the sealing tube member, and
wherein the connection surface facing the liquid pressure chamber constitutes at least a part of the biasing pressure receiving surface.

4. The control valve according to claim 3 ,
wherein a joint flange coupled to a housing main body is provided on a side radially outward with respect to a circumferential wall constituting the large diameter inner circumferential surface of the joint member,
wherein a burr accommodation portion accommodating burrs generated when the joint flange and the housing main body are joined to each other is provided between the circumferential wall and the joint flange, and
wherein the circumferential wall is constituted to also serve as a burr restriction wall restricting an outflow of burrs from the burr accommodation portion.

5. The control valve according to claim 2 ,
wherein a support surface is provided in an end portion of the sealingtube member on a side away from the valve body, and
wherein a displacement restriction spring for restricting a displacement of the sealing tube member is interposed between the joint member and the support surface.

6. The control valve according to claim 3 ,
wherein a second stepped surface bent in a diameter reducing direction in a stepped state is continuously provided on the small diameter inner circumferential surface of the joint member,
wherein a support surface is provided in an end portion of the sealing tube member,
wherein a displacement restriction spring for restricting a displacement of the sealing tube member is interposed between the second stepped surface and the support surface, and
wherein a restriction tube extending in an axial direction from a radially inner end portion of the second stepped surface or the support surface is provided in an extending manner in a part positioned on a side radially inward with respect to the displacement restriction spring.

7. The control valve according to claim 3 ,
wherein a support surface is provided in an end portion of the sealing tube member on a side away from the valve body, and
wherein a displacement restriction spring for restricting a displacement of the sealing tube member is interposed between the joint member and the support surface.

8. The control valve according to claim 4 ,
wherein a support surface is provided in an end portion of he sealing tube member on a side away from the valve body, and
wherein a displacement restriction spring for restricting a displacement of the sealing tube member is interposed between the joint member and the support surface.

9. The control valve according to claim 4 ,
wherein a second stepped surface bent in a diameter reducing direction in a stepped state is continuously provided on the small diameter inner circumferential surface of the joint member,
wherein a support surface is provided in an end portion of the se

Assignees

• Yamada Mfg Co Ltd

Inventors

• Ozeki Akifumi

Classifications

• F16K11/085

  with cylindrical plug · CPC title

• F16K5/0457 Primary

  Packings · CPC title

• F16K11/076 Primary

  with sealing faces shaped as surfaces of solids of revolution · CPC title

• F16K39/06

  for taps or cocks · CPC title

• F16K39/045

  of rotating or pivoting type · CPC title