HelloFoxtrap,
With respect to your application, the wafer valve is typically used between two raise flaced flanges and then all-thread is used to "sandwich" the butterfly valve between the flanges. The pressure of the nuts on the backside of the flange squeeze the gaskets into the face of...
The Cooper Cameron General Twin Seal Valve will fill your request.They are the world's leading manufacturer of high-integrity, positive shutoff Double Block & Bleed valves. It has been around since 1941.
Bob Paul
paulrj@ccvalve.com
Another major butterfly manufacturer is Cooper Cameron Valves. Theire brands, WKM HPBFV's, DEMCO, E-Series, fit the size, pressure and application needs of most industries, from food and beverage to saturated steam.
Bob
