D343 Triple Eccentric Multi level Metal Hard Seal/PTFE Seal Worm Gear Transmission Flange Butterfly Valve
D373 three eccentric multi-level metal hard seal/PTFE sealing worm gear transmission flange butterfly valve
D373 three eccentric multi-level metal hard seal/PTFE sealing worm gear transmission flange butterfly valve
D643 three eccentric multi-level metal hard seal/PTFE seal pneumatic transmission flange butterfly valve
D673 three eccentric multi-level metal hard seal/PTFE seal pneumatic transmission flange butterfly valve