Butterfly valve assembly and method of making same

摘要

A butterfly valve assembly and method of making the same are provided wherein such valve assembly has a valve body structure and a closure structure and is provided with a new device for locking, in its closed position, a shaft assembly which is used to operate the closure structure. In accordance with another feature of the invention a new butterfly valve and method of making same are provided wherein such butterfly valve has new heat exchange devices comprising same for controlling the temperature thereof.