DIN 3352 F4 Ggg50 DN65 Non-Rising Stem Resilient Seat Ductile Iron Gate Valve with Factory Price

DIN 3352 F4 Ggg50 DN65 Non-Rising Stem Resilient Seat Ductile Iron Gate Valve with Factory Price

A circular groove is opened in the middle of the two flanges, the metal ring is placed in, the two flanges are hit hard, and the flange is hard connected.