Arrangement on a butterfly valve
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United States of America Patent
Stats
-
Apr 30, 1985
Grant Date -
N/A
app pub date -
Oct 7, 1982
filing date -
Oct 14, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Butterfly valve comprising a valve housing and a flap and two soft sealing rings retained by undercut grooves in the valve housing and from said grooves radially inwardly projecting sealing lips for engagement with the sealing surface of the flap. By means of the two soft sealing rings which are separated by a flexible intermediate ring (18) of metal, the radial inner edge thereof is formed with two opposite directed sealing lips, a complete fluid sealing in both pressure directions is obtained. In the event of destruction of the soft sealing rings caused by eventual fire in the valve, the pressure of the fluid will result in deformation or flexing of the intermediate ring, so that the one or the other of the sealing lips is pressed against the sealing surface of the flap and, thereby obtaining a fire proof seal in both directions. Said flexing or deformation of the intermediate ring is obtained by means of a weakened central cross sectional section provided by means of at least one, preferably two circular grooves in the lateral opposing surfaces of the intermediate ring.
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Cited Art Landscape
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