Double eccentric valve

Patent metadata

Field	Value
Publication number	US-11274750-B2
Application number	US-201816613232-A
Country	US
Kind code	B2
Filing date	Jun 1, 2018
Priority date	Jul 11, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

In a double eccentric valve, a valve seat or valve body includes a rubber seal part in which a seat surface or seal surface is formed. An interference between the valve seat and the valve body is made minimum at a position of a rotary-shaft-directional end of the valve body in the radial direction of the valve body which is parallel to an extending direction of the axis of a rotary shaft.

First claim

The invention claimed is:

1. A double eccentric valve comprising:
a valve seat including a valve hole and an annular seal surface formed along an edge of the valve hole;
a valve element having a circular disc shape and including an outer periphery formed with an annular seal surface corresponding to the seat surface; and
a rotary shaft configured to rotate the valve element,
the rotary shaft having a first axis that extends in parallel with a radial direction of the valve element and the valve hole, the rotary shaft being positioned eccentrically from a center of the valve hole in a radial direction of the valve hole, the seal surface being positioned eccentrically from the first axis of the rotary shaft toward an extending direction of a second axis of the valve element, and the valve element being configured to rotate about the first axis of the rotary shaft to move between a fully closed position where the seal surface is in surface contact with the seat surface and a fully open position where the seal surface is furthest away from the seat surface,
wherein either the valve seat or the valve element is provided with a rubber seal part formed with either the seat surface or the seal surface, and
the valve seat and the valve element are configured to make an interference between the valve seat and the valve element, the interference being a minimum at a position of a rotary-shaft-directional end of the valve element in a circumferential direction of the valve element,
the position of the rotary-shaft-directional end of the valve element is a position of an end of the valve element in the radial direction of the valve element, which is a direction parallel to an extending direction of the first axis of the rotary shaft.

2. The double eccentric valve according to claim 1 , wherein
the valve seat is provided with the rubber seal part including the seat surface, and
the valve element is provided with a cutout portion at the position of the rotary-shaft-directional end.

3. The double eccentric valve according to claim 1 , wherein the valve element has an elliptical shape with its minor axis extending in the direction parallel to the extending direction of the first axis of the rotary shaft.

4. A double eccentric valve comprising:
a valve seat including a valve hole and an annular seat surface formed along an edge of the valve hole;
a valve element having a circular disc shape and including an outer periphery formed with an annular seal surface corresponding to the seat surface; and
a rotary shaft configured to rotate the valve element,
the rotary shaft having a first axis that extends in parallel with a radial direction of the valve element and the valve hole, the rotary shaft being positioned eccentrically from a center of the valve hole in a radial direction of the valve hole, the seal surface being positioned eccentrically from the first axis of the rotary shaft toward an extending direction of a second axis of the valve element, and the valve element being configured to rotate about the first axis of the rotary shaft to move between a fully closed position where the seal surface is in surface contact with the seat surface and a fully open position where the seal surface is furthest away from the seat surface, wherein
the valve element includes a first side part and a second side part divided by a boundary defined by a virtual plane extending from the first axis of the rotary shaft in parallel with an extending direction of the second axis of the valve element,
when the valve element is rotated in a valve closing direction, the first side part rotates from an inside toward an outside of the valve hole while the second side part rotates from the outside toward the inside of the valve hole,
the groove is formed in the seat surface of the rubber seal part provided in the valve seat,
the groove extends entirely in a circumferential direction of the valve seat, and
a first portion of the groove located on a side where the first side part slides is placed at a position closer to a central axis of the valve hole relative to a second portion of the groove located on a side where the second side part slides.

5. A double eccentric valve comprising:
a valve seat including a valve hole and an annular seat surface formed along an edge of the valve hole;
a valve element having a circular disc shape and including an outer periphery formed with an annular seal surface corresponding to the seat surface; and
a rotary shaft configured to rotate the valve element,
the rotary shaft having a first axis that extends in parallel with a radial direction of the valve element and the valve hole, the rotary shaft being positioned eccentrically from a center of the valve hole in a radial direction of the valve hole, the seal surface being positioned eccentrically from the first axis of the rotary shaft toward an extending direction of a second axis of the valve element, and the valve element being configured to rotate about the first axis of the rotary shaft to move between a fully closed position where the seal surface is in surface contact with the seat surface and a fully open position where the seal surface is furthest away from the seat surface, wherein
at least one of the seat surface and seal surface includes an asperity or a groove,
either the valve seat or the valve element is provided with a rubber seal part including the seat surface or the seal surface, and
the seat surface or the seal surface of either one of the valve seat or the valve element, the one being not provided with the rubber seal part, includes the asperity or the groove.

Assignees

• Aisan Ind

Inventors

• Itahara Mitsuyoshi
• Yoneshige Kazuhiro
• Kawazoe Hiroshi
• Fukui Makoto
• Nagata Sadatsugu

Classifications

• F16K1/2064

  with a channel- or U-shaped seal covering a central body portion · CPC title

• F16K1/226 Primary

  Shaping or arrangements of the sealing · CPC title

• F16K1/205 Primary

  the sealing being arranged on the valve member · CPC title

• F02M26/70

  Flap valves; Rotary valves; Sliding valves; Resilient valves · CPC title