PLUG VALVE

• US 3,554,488 A
• Filed: 08/19/1968
• Issued: 01/12/1971
• Est. Priority Date: 08/19/1968
• Status: Expired due to Term

• Current Assignee: William H. Alexander
• Original Assignee: William H. Alexander
• Inventors: Alexander, William H.
• Application Number:
  US04/753,664
• Time in Patent Office: 876 Days
• US Class Current: 251/317
• CPC Class Codes: F16K 27/062 with conical plugs
• CPC Class Codes: F16K 5/0264 in the housing
• CPC Class Codes: F16K 5/0271 between housing and plug
• CPC Class Codes: F16K 5/161 with the housing or parts of the housing mechanically pressing the seal against the plug

Abstract

Plug valve including a cylindrical cavity with ports and elastomeric seats within the cavity at the ports defining a tapered opening for receiving a tapered plug.

Claims

1. A plug valve comprising a body, a cavity in said body having a cylindrical wall, coaxially aligned inlet and outlet ports in said body along said cylindrical wall, the axis of said ports being normal to the axis of the cylindrical wall, a pair of identical elastomeric seats one at each port, a tapered plug having a frustoconical face arranged in the cavity and interposed between and engaging said seats, a hole extending diametrically through said plug to control the flow through the valve between the ports, a stem on said plug projecting from the body, each said seat having a rectangular shape as viewed along the axis of said ports and from a centerline extending normal to the axis of and between said ports and including top, bottom and opposed walls surrounding an opening therethrough, said walls having a common outer particylindrical convex face in engagement with the cavity cylindrical wall and a common inner partifrustoconical face in engagement with the plug frustoconical face, and a continuous port ring protruding from said particylindrical face being telescopically matingly received in a port.

2. A plug valve as defined in claim 1, and means on the outer face of each seat coacting with means on the body cylindrical wall for orienting and supporting the seat relative the body.

3. A plug valve as defined in claim 2, wherein said means on each said seat includes a lip projecting from the outer face, and said means on said body including a groove matingly receiving said lip.

4. A plug valve as defined in claim 2, wherein said means on each said seat includes upper and lower lips projecting from the outer face, and said means on said body including upper and lower grooves matingly receiving said upper and lower lips.

5. A plug valve as defined in claim 4, wherein said lips are parallel spaced and normal to the rotational axis of said plug.

6. A plug valve comprising a body core having an inlet port and an outlet port coaxially aligned therewith, a cylindrical cavity in said body core extending normal t the axis of said ports, a pair of identical seats in said cavity one at each of said ports, a tapered plug in said cavity interposed between the seats and having a stem integral therewith and projecting from the body, an opening extending through said plug for selectively intercommunicating the ports, each of said seats having a rectangular shape as viewed along the axis of said ports and from a centerline extending normal to the axis of and between said ports and being of elastomeric material and including top, bottom, and opposed side walls, and a cylindrical port ring surrounded by said walls and matingly received in a port, the walls having an outer common convex particylindrical face engaging the cylindrical cavity about the port and an inner common concave particonical face mating with the plug, whereby the lower wall is thicker than the upper wall and the opposed side walls are progressively thicker from top to bottom.

7. A plug valve as defined in claim 6, and lip means on the seat outer face coacting with groove means on the cylindrical cavity to position and support the seats within the cavity.

8. A plug valve as defined in claim 6, wherein the elastomeric material of the convex face is harder than the elastomeric material of the concave face.

9. A seat of elastomeric material for a plug valve comprising a curvate body having top, bottom and opposed walls surrounding an opening therethrough, said walls having a common outer particylindrical convex face and a common inner partifrustoconical concave face, the outer face adapted to sealingly engage the valve body and the inner face adapted to sealingly engage the plug, and a continuous port ring protruding from the outer face adapted to engage a port in the valve body, said seat having a rectangular shape as viewed from one side along the centerline extending through said port ring.

10. A seat as defined in claim 9, and support lip means on the outer face adapted to coact with groove means in said valve body to support the seat in a predetermined position within the valve body.

11. A seat as defined in claim 10, wherein said support lip means includes a support lip along the top wall and a support lip along the bottom wall.

12. A seat as defined in claim 11, wherein said lips are parallel spaced and extend normal to the rotational axis of a plug.

13. A seat as defined in claim 9, wherein said continuous port ring is in the form of an annulus.

14. A seat as defined in claim 9, wherein the elastomeric material of the convex face is harder than the elastomeric material of the concave face.

15. A plug valve comprising a body including a generally cylindrical wall open at the bonnet end and closed at the other end and defining a cylindrical walled cavity, coaxially aligned and diametrically extending ports in said cylindrical wall defining an outlet and an inlet, a pair of identical elastomeric seats one at each port, each seat having a rectangular shape as viewed along the axis of said ports and from a centerline extending normal to the axis of and between said ports and an outer convex particylindrical face engaging the cylindrically walled cavity and an inner concave partifrustoconical face and an opening aligned with a port, a port ring extending from the convex side about the opening and telescopically received by said port, a tapered plug having a frustoconical face engaging the partifrustoconical faces of said seats, a passageway extending diametrically through said plug for selectively intercommunicating the openings in said seats, a stem extending from said plug, and a cover fitting over said stem and closing the bonnet and holding said plug in proper position relative the seats.