Inventors:
Thomas A. Wilson - Tulsa OK
James D. Ward - Tulsa OK
Assignee:
Dover Corporation - Tulsa OK
International Classification:
F16K 1226
Abstract:
An improved butterfly valve having leak detecting means, the valve body having a flow passageway therethrough, and co-axial top and bottom shaft openings and a seat circumscribing the flow passageway, a disc having an uninterrupted circumferential sealing surface having two spaced apart circumferential sealing contacts providing a circumferential valley therebetween. An upper and lower shaft portion is received in the body shaft openings, one of the shaft portions being secured to the disc providing means of positioning the disc and one of the shaft portions having a passageway therein communicating with the exterior of the valve body, the disc having a passageway communicating with the disc circumferential valley and the shaft passageway so that fluid leakage past either one of the disc sealing contacts will be conducted exteriorly of the body as an indication of loss of valve integrity when the valve is in the closed position.