Jeffrey E Bowman

US Patent:

47736275, Sep 27, 1988

Filed:

Jul 6, 1987

Appl. No.:

7/071940

Inventors:

Nolan D. King - Portland OR
Jeffrey M. Bowman - Portland OR

Assignee:

Rovang, Inc. - Portland OR

International Classification:

F16K 300

US Classification:

251328

Abstract:

An improved gate valve for effective sealing regardless of the pressure of the fluid of the conduit to which the valve is attached. The gate valve comprises a body (20) having opposing upstream and downstream sides (46, 44). Each side has a conduit-joining surface (72, 73) formed thereon. The body is configured for connection between two axially aligned conduits (24, 25) with each conduit-joining surface abutted against the end of an associated conduit. A resilient liner (27) is attached to the body between the valve gate (32) and the body (20). The liner also covers the portion of the body that defines the port. The liner includes a sealing surface (60) formed thereon. The sealing surface is configured for sealing contact with the portion of the edge surface of the gate that resides within the body when the gate is in the closed position. The gate valve also includes at least one seal ring (62) positioned against the body at the periphery of the port on one side of the gate. The seal member has a gate-engaging part (64) located adjacent the gate.

US Patent:

48817198, Nov 21, 1989

Filed:

Sep 23, 1988

Appl. No.:

7/248050

Inventors:

Jeffrey M. Bowman - Portland OR

International Classification:

F16K 302

US Classification:

251328

Abstract:

A gate valve body member 10 and plastic liner 12 define a flow passage 24 therethrough which communicates with a pair of pipes 34 bolted to the gate body. The liner has a bottom seating surface engageable by the gate 22 and extending from a central point outward to the sides of the flow passage. A top opening recess 54 in the liner 12 receives the gate in a slidable sealing fit. The recess and gate are wider than the flow passage and defining walls of the gate receiving recess terminate at the bottom intermediate the center and sides of the seating surface to provide side sealing and pressure backing support in both directions of flow for a lower portion of the gate and particularly a support below the horizontal center line of the flow passage. The seating surface includes a central arcuate surface portion and straight surface portions joined therewith and extending outwardly to the sides, the bottom edge of the gate being configured to fit the arcuate and straight surface portions. The bottom termination of the recess is approximately at the juncture between the central arcuate surface portion and the straight surface portions.