... with press fixed in body, can achieve on-line maintenance, replacement;3.30 "72 "eccentric structure, equipped with overflow valve disc way, can ... specifications disc seal face for stainless steel, can reduce the valve shut up torque and longer service life.5. Through the ... or U sealing ring from seal, prolong the service life of the valve;7. According to AWWA C504 valve for switch life test, in ...