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A valve seat especially adapted for a high performance butterfly valve is characterized by flexing axially rather than stretching radially when the seat interfaces with a closure member. In the preferred form, a seat has a support member embedded therein to provide restorative forces which tend to u

A valve seat especially adapted for a high performance butterfly valve is characterized by flexing axially rather than stretching radially when the seat interfaces with a closure member. In the preferred form, a seat has a support member embedded therein to provide restorative forces which tend to urge the valve seat to a predetermined position in response to axial flexing.

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A butterfly valve with a pressure assisted seat member, which comprises: (a) a valve body having a central bore therethrough; (b) a disc member mounted in said bore and movable between an open and closed position about an axis transverse to said bore and having a peripheral sealing surface; (c) an a

A butterfly valve with a pressure assisted seat member, which comprises: (a) a valve body having a central bore therethrough; (b) a disc member mounted in said bore and movable between an open and closed position about an axis transverse to said bore and having a peripheral sealing surface; (c) an annular recess circumscribing said bore and disposed in radial alignment with said sealing surface of said disc member when said disc member is closed; (d) a symmetrical seat member formed of a fluorinated hydrocarbon polymer supported in and extending radially inward from said annular recess to selectively and sealingly interface with said sealing surface on said disc member, said seat member including: (i) a first portion secured within said annular recess; (ii) a second portion disposed radially inward with respect to said first portion and having an axial dimension which is smaller than the axial dimension of said first portion; (iii) a third portion disposed radially inward with respect to said second portion and having an axial dimension which is greater than the axial dimension of said second portion; (e) means for compressingly engaging the second portion of said seat member, said seat member cooperating with said disc member to axially flex the seat member at the second portion, said engaging means serving to concentrate axial flexure at that location; (f) a continuous support membrane within said seat extending radially inward from said first portion of said seat member into said third portion of said seat member, said support membrane having a dimension in the radial direction which is greater than its axial dimension and being axially pliant to urge the seat member to a predetermined position in response to axial deflections; and (g) side walls extending radially inward from said annular recess which are proximate to said seat but axially spaced from the third portion thereof, said side walls being operative to limit axial movement of said seat.