Patent ID: 8348235

Claim:
A butterfly valve comprising a valve body defining a valve orifice and a valve member rotatably mounted in the valve orifice, the valve member comprising a disc element detachably mounted to a mounting plate, the valve member being mounted to a rotatable axle which extends between the disc element and mounting plate thereof, the valve body comprising an annular valve seat against which the disc element of the valve member seals when the valve is closed, wherein said mounting plate is fixed to a rear surface of said disc element via bolts, the rear surface of the disc element being mounted in face-to-face registration with a surface of said mounting plate and with the bolts extending through apertures in said mounting plate into blind internally threaded bores formed in the rear surface of said disc element for minimizing potential leak paths across the valve member and for allowing the disc element and said mounting plate to be separable from each other and from the rotatable axle without being required to withdraw the rotatable axle from the valve orifice in which the butterfly valve is a triple offset butterfly valve.