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1. Design and Manufacture: According to Standard:ANSI, B16.34,API600,API602. 2. Connection Length:According to ANSI B16.10. 3. Size of the Junction End: According to ANSI B16.25(B.W). 4. Testing of Valves:According to API 598. 5. Structure Characteristics:B.B; OS&Y 6. Main Materials A105;F5;F11;F22;304;304L;316;316L;LF2 etc.