Improved butterfly valve accommodating full flow when in an open position, in which the valve is made from a resilient material and has compressive engagement with a seat contoured along a generally f

A high pressure butterfly valve having a pressure actuatable valve element that is flexed by fluid pressure to enhance the sealing ability of the valve in direct proportion to the pressure of the flui

The typical butterfly valve heretofore known comprises an approximately cylindrical casing having an annular valve seat on its inner peripheral surface, a valve stem rotatably extending through the ca

A butterfly valve assembly for installation in a pipe line between flanges having spaced parallel planar annular faces extending transversely of and centered upon the lengthwise axis of said pipe line

Butterfly valves are typically simple and reliable valve structures that are particularly designed for operation in a low pressure service condition. Sealing of a butterfly valve is generally accompli

Butterfly valves typically include a circular valve member or disc which is rotatably mounted inside a valve body having a generally cylindrical bore defining a flow passage. O-rings formed from a sof

Some prior attempts have been made to provide a partially water-cooled butterfly valve wherein coolant water is introduced to the rotatable disc portion of the valve at one side thereof and withdrawn

With a butterfly valve of the type just described, it is desirable to provide features that will optimize the sealing effectiveness of the valve, yet minimize certain disadvantages apparent in prior a