... various kinds of valves and pipe fittings made of stainless steel, carbon steel and malleable iron, and we can also design different ... , gate valves, strainers, sanitary valve & fitting, quick couplings such as type A,B,C,D,E,F,DC,DP,pipe fittings such ... on. They are all up to ANSI, API, DIN, BS, JIS, GB standards an so on. swing check valve