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butterfly valve wherein coolant water is introduced to the rotatable disc portion of the valve at one side thereof and withdrawn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

In view of the above-noted state of the art, the object of this invention is to provide a butterfly valve free from sticking at the bearing portions and from an inconvenient flexion of the stem under

The main object of the present invention is to provide a butterfly valve having good sealing capacity and not implying soft sealing element made of rubber, plastic or similar materials. More specifica

An object of the invention is to provide a butterfly valve which is arranged to facilitate removal from and replacement in a piping system without disturbing the piping system.

One important feature of the new valve construction resides in an actuating shaft supporting structure which provides a combined shaft bearing and seal arrangement for reliably preventing the escape o

Butterfly valves have long been used to control fluid flowing in conduits and problems relating to the general design and constructional features of such valves have been recognized. Generally butterf

In butterfly valves such as are used in controlling the flow of liquids to heating systems as in autmobile heating systems, it is common to provide a body having a generally cylindrical passage, a piv