1.The material of vlave disk an the vlave sealing face is the cobalt base hard alloy(stellite)that is hard,anti-attrite,themostable,anti-corrosive,the anti-abrasion......
1) Design standards: API 600, API 6D, JIS B2073, JIS B2083
2) Inspection and test standards: API 598, JIS B2003
3) Face-to-face: ASME / ANSI B16.5, JIS B2002......
1. Testing of Valves:According to API 598.
2. Structure Characteristics:B.B; OS&Y or W.B;OS&Y.
3. Materials:According to the requirements of AISI/ASTM......