Quaternary Science Reviews 25

A valve for use in a service requiring the valve to be heated or cooled, wherein the chamber for circulation of the heat transfer medium is formed between the outer periphery of the valve body and the inner periphery of a surrounding operating housing. The operating housing carries the valve operator and a valve stem. The valve body is insertable lengthwise into the operating housing and a valve stem carried by the valve body and connected to the valve member is adapted to be connected to the operating housing valve stem when the valve body is inserted into the operating housing. The valve is adapted for use between mating pipe flanges. Various types of rotary valves and valve body and operating housing configurations are disclosed.