Title: Butterfly valve

Abstract: The valve closure element has an annular peripheral groove opening outwardly onto the periphery of the closure element. An annular sealing element has an annular heel portion disposed in the groove. The latter has an inner end face whose diameter is less than the inside diameter of the heel portion. The groove is defined laterally by two confronting annular faces of the closure element which have a substantially rectilinear generatrix and grip the heel portion so as to prevent relative movement of the heel portion and closure element.

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Inventors: Santy, Jean (Pont-a-Mousson, FR)
Hochain, Etienne (Pont-a-Mousson, FR)
Schneider, Andre (Pont-a-Mousson, FR)

Application Number: 871893
Filing Date: 1978-01-23
Publication_date: 1979-05-15
Assignee: Pont-a-Mousson S.A. (Nancy, FR)
Primary Class(es): 251/175 251/306, 251/332, 251/357
Other Classes:
US Patent Ref:

3301523	Jan, 1967	Lowrey	251/332.
3394914	Jul, 1968	Nagasato	251/173.
3409269	Nov, 1968	Fawkes	251/173.

Other Refs: 12429601297427245650

Jun, 1967	DE
Jun, 1969	DE
Jan, 1926	GB

Primary Examiner: Schwadron, Martin P.
Assistant Examiner: Spiegel, H. Jay
Attorney: Sughrue, Rothwell, Mion, Zinn and Macpeak