by
kiki prom August 14, 2017
THE MAIN TYPE AND MATERIALS OF VALVES(1)DIN gate valve, ANSI gate valve, BS gate valve, GOST gate valve, Metal/Rubber seat gate valve, Knife gate valve, Flat gate valve(2)Check valve, lift check valve, (double/single disc) swing check valve, wafer type check valve, spring check valve, Ball Che...