... high flow rate, save energy.** Stainless steel seat** Unique sealing ring, with saw-tooth sides, embedded directly into disc ... uniform & tight sealing effect, aspiratory rubber sealing ring, prolonged service life.** Unique taper pin, US patent design pin, bolt free ... maintenance.** Streamline structure, high Cv valueDual direction flowing** Unique taper pinUS patent design pinLarge contact area, tight ...