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Rotary plug valve
| Details |
Inventors: Halpine, Joseph C.;
Assignee: Fluid Measurement Systems, Inc. (Tulsa, OK)
Primary Examiner: Rosenthal; Arnold
Assistant Examiner:
Attorney, Agent or Firm: Head, Johnson & Chafin
An improved rotary plug valve which has a housing having an axial, tapered inner wall forming a tapered inner cavity, with a plurality of radial openings in a transverse plane, at selected angles, leading into the tapered inner cavity. A rotatable tapered plug is adapted to fit inside the tapered cavity, and having "0" ring seal means to seal the outer surface of the plug to the inner wall of the housing. Selected conduits through the plug provide means to control flow of liquid entering one or more of the openings in the housing, to flow through the plug to other selected openings, dependent on the anular position of the plug. The cavity is closed by top and bottom closures. The rotor has an axial shaft, by means of which it can be rotated exteriorly of the valve, by the passage of the shaft up through the center of the top closure. There are cooperating cam surfaces on the top of the plug and the bottom surface of the top closure, and similarly, between the bottom surface of the plug and the top of the bottom closure, such that, as the plug is rotated in one operating position, it is at its lowest position in the tapered cavity, with the surfaces fully sealed, whereas, as it is turned the plug is lifted by the cooperating cam surfaces below, so that there is more clearance between the plug and the tapered inner surface and the rotor can be turned freely. |
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DETAILED DESCRIPTION It is a primary object of this invention to provide a plug valve having a plurality of openings into a central cavity space, circumferentially around the cavity, and to have a plug which is adapted by means of interior conduits to connect different ones of said plurality of openings as the plug is rotated.
It is a further object of this invention to provide a cam means operating on the bottom surface and the top surface of the plug, to force the plug to its lowest position or tightest sealing position, when it is in proper operating position, to connect selected openings, and alternately to lift the plug toward the wider end of the conical cavity as the plug is turned from one operating position to another operating position.
These and other objects are realized and the limitations of the prior art are overcome in this invention by providing a plug valve having a cylindrical housing which contains an axial conical cavity.
The conical wall of the cavity is connected by a plurality of openings through radial pipes to the outside of the valve for purpose of connection of fluid conduits to the plug.
The interior of the housing is sealed at top and bottom by suitable closure plates.
The plug is constructed of a taper identical to that of the inner wall of the cavity, so that with suitable sealing members, such as "O" rings, the plug will seat and seal in the cavity.
The plug has at least one channel cut into the outer wall of the plug between its ends at a direction substantially perpindicular to the axis or through the plug.
This channel is adapted to connect when the plug is in an operating position, between two openings into the internal cavity.
The bottom closure plate has a cam surface on its top surface, which cooperates with a cam surface cut into the bottom surface of the plug, so that, when the plug is in its proper operating position, the plug will rest in its lowest position in the cavity, where the seal members adequately seal the channels of the plug.
Similarly, there are cam surfaces on the lower surface of the top closure plate and the top surface of the plug, which cooperate with each other and with the two cam surfaces below, to accomodate the upward and downward movement of the plug as its is rotated by the shaft attached to the plug
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Metal Working 
