Garry K Miller

US Patent:

61421731, Nov 7, 2000

Filed:

Jul 30, 1996

Appl. No.:

8/688332

Inventors:

Harry H. Bekeredjian - Canoga Park CA
Jose M. Magno - North Hollywood CA
Garry L. Miller - Saugus CA
Douglas R. Swingley - Saugus CA

Assignee:

Spears Manufacturing Company - Sylmar CA

International Classification:

F16L 700

US Classification:

137375

Abstract:

A high purity, corrosion resistant butterfly valve comprises a pair of body halves each having an inner surface and an outer surface, and an inner face extending between the inner surface and the outer surface; a liner fitted to the inner surface of the body halves and defining a fluid media passage; and a disk member mounted on a stem and pivotally movable in the fluid media passage between open and closed positions. No sealing element is provided between the inner faces of the body to enable the fluid media to pass between the inner faces to the outer surface if leakage occurs and provide an external indication of leakage. The liner and the disk member form a direct seal in the closed position and are substantially the only elements of the butterfly valve that are wetted during service. The liner and the disk member are formed of materials that are corrosion resistant and substantially chemically inert and non-contaminating with respect to high purity, de-ionized water.