BFVAW NO – BUTTERFLY VALVE, ACTUATED / WELD ENDS / NORMALLY OPEN – 1″, Commonly referred to as “normally open”, these quarter-turn stainless steel sanitary valves use a disc mounted on a rotating spring-loaded shaft operated with an actuator to close and control flow. Designed to connect to tubing for a permanent and flush welded connection. In the event of failure, these valves fail open.