A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The “butterfly” is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway.
B & B Industrial can supply butterfly valves in every configuration
Cast iron construction double flanged operation by worm gear, pneumatic actuator and electric actuator stainless steel seat and unique sealing.