Cartridge seated plug valve

Patent metadata

Field	Value
Publication number	US-9441740-B2
Application number	US-201414546236-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Nov 18, 2014
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

A cartridge seated plug valve includes a hollow body with an inlet, an outlet, and a cylindrical valve chamber. A C-shaped rotor with an elastomeric coating is rotatably held in the valve chamber by a valve cover and a base. A valve facing with an elastomeric gasket is held adjacent to the inlet, with a central aperture of the valve facing aligned with the inlet, and the elastomeric gasket held in compression about an inlet seal surface at a perimeter of the inlet, by facing channels in the cover and base. In a closed position, the rotor is oriented with the elastomeric coating of the plug segment sealing the central aperture. The valve is opened by rotating the main stem, changing an orientation of the rotary plug, and moving the plug segment away from the inlet.

First claim

What is claimed is:

1. A cartridge seated plug valve comprising:
a) a hollow valve body comprising:
i) a cylindrical valve chamber with a first end and a second end, a wall with a radius of curvature having an origin at a cylindrical valve chamber axis defined between the first end and the second end;
ii) an inlet passing from an outside of the hollow valve body through the hollow valve body into the cylindrical valve chamber at a first location on the wall;
iii) an inlet seal surface surrounding the inlet on the wall; and
iv) an outlet passing from an outside of the hollow valve body through the hollow valve body into the cylindrical valve chamber at a second location on the cylindrical valve chamber wall;

b) a base attached to the hollow valve body sealing the first end of the cylindrical valve chamber, comprising:
i) an inner side including a trunnion journal with a center for receiving a trunnion, the center of the trunnion journal being radially offset from the cylindrical valve chamber axis; and
ii) a first facing channel adjacent the inlet seal surface of the hollow valve body;

c) a valve cover attached to the hollow valve body sealing the second end of the cylindrical valve chamber, comprising:
i) an inner side;
ii) an outer side;
iii) a main stem journal with a center for receiving a main stem passing from the inner side of the valve cover to the outer side of the valve cover, the center of the main stem journal being radially offset from the cylindrical valve chamber axis;
iv) a second facing channel adjacent to the inlet seal surface of the hollow valve body, arcuate in shape and with a radius of curvature whose origin is coincident with the valve chamber axis, the second facing channel being aligned with at least an arc length of the first facing channel when the valve cover and base are assembled with the hollow valve body, and following a circumferential path, at a radial distance from the valve chamber axis from a location at a first side of the inlet, past the inlet and to a location at a second side of the inlet; and
v) a rotor axis defined by the center of the main stem journal and the center of the trunnion journal;

c) a rotor, rotatable from a first orientation in which flow of a fluid from the inlet into the cylindrical valve chamber is blocked, to a second orientation permitting flow of a fluid from the inlet of the hollow valve body into the cylindrical valve chamber, comprising:
i) a plug segment with a first end, a second end, and a seal surface with an elastomeric coating bonded to at least a portion of the seal surface;
ii) a first elbow segment coupling the first end of the plug segment to a main stem rotatably held by the main stem journal of the valve cover; and
iii) a second elbow segment coupling the second end of the plug segment to a trunnion rotatably held by the trunnion journal of the base;
the first elbow segment and the second elbow segment holding the plug segment parallel to the rotor axis and adjacent the inlet seal surface when the rotor is in the first orientation; and

d) a valve facing comprising:
i) a curved body with a first side and a second side opposite the first side, a first end held in the first facing channel and a second end held in the second facing channel, the second end being dimensioned such that the second end fits into the circumferential path of the second facing channel from the location at the first side of the inlet to the location at the second side of the inlet, preventing the curved body from rotating within the valve chamber so that alignment with the inlet is maintained;
ii) a central aperture passing through the curved body from the first side to the second side, and aligned with the inlet of the hollow valve body; and
ii) an elastomeric gasket bonded to the first side of curved body surrounding the central aperture;

such that when the rotor is in the first orientation, the plug segment of the rotor is positioned with the elastomeric coating of the seal surface of the plug segment of the rotor in compression against the second side of the curved body of the valve facing and sealing the central aperture of the curved body of the valve facing, and when the rotor is rotated to a second orientation, the plug segment of the rotor is positioned a distance from the central aperture of the curved body of the valve facing.

2. The cartridge seated plug valve of claim 1 , wherein the curved body of the valve facing is made of stainless steel.

3. The cartridge seated plug valve of claim 1 , wherein the elastomeric gasket of the valve facing is made of rubber.

4. The cartridge seated plug valve of claim 1 , wherein the elastomeric gasket of the valve facing is bonded to the curved body of the valve facing with a rubber tearing bond.

5. The cartridge seated plug valve of claim 1 , wherein the elastomeric coating of the plug segment of the rotor is made of rubber.

6. The cartridge seated plug valve of claim 1 , wherein the elastomeric coating of the plug segment of the rotor is bonded to the seal surface of the plug segment of the rotor with a rubber tearing bond.

Assignees

• Kennedy Valve Company

Inventors

• Kennedy Paul

Classifications

• F16K5/0464

  in the housing · CPC title

• F16K27/065

  with cylindrical plugs · CPC title

• F16K5/045 Primary

  Particular coverings and materials · CPC title

• F16K25/005

  Particular materials for seats or closure elements · CPC title