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Butterfly Valve Seat ring???????¬?? / ???????? / ????????: ???????? / ?????????? / ???????? / ?????????? Seat Ring for Wafer Type Butterfly Valve with Manual Lever Handle Seat Ring for Wafer Type Butterfly Valve with Hydraulic Actuator Seat Ring for Lug Type Butterfly Valve with Hydraulic Actuator Seat Ring for Flange Type Butterfly Valve with Manual Worm Gear Operator Seat Ring for Lug Type Butterfly Valve with Manual Lever Handel Seat Ring for Lug Type Butterfly Valve with HYD. Transmitter operator Makers????: Keystone Valve Ltd. Material????: NBR EPDM VITON Size/Press.????/ ????: 5K 10K 16K 50A, 6**, 80A, 100A, 150A, 200A, 250A, 300A, 350A, 400A, 450A, 500A, 550A, 600A, 650A, 750A Model & Code No.???????¢??: Keystone Valve Seat FAR1 Keystone Valve Seat FIG1 Keystone Valve Seat FAR2 Keystone Valve Seat F990