... The manufacture of the ball uses advanced grinding equipment and technology, so the ball has high roundness, good surface quality ... , carbon steel StrainerWCB BonnetCast iron, ductile iron, carbon steel Control valveWCB DiaphragmNBR / EPDM StemStainless steel Seat Stainless steel Notice: ... demand. Due to the products’ continue update, the above data is just a reference. For the details, please contact ...