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Fisher POSI-SEAL A31A High Performance Butterfly Valve …
www.emerson.comThe A31A high‐performance butterfly valve features a keyed drive shaft. The keyed shaft combines with a variety of handlevers, handwheels, pneumatic piston or spring‐and‐diaphragm actuators to make the A31A a reliable, high‐performance, butterfly valve for a variety of applications in the various process industries.