Domestic Standards (China)
• JB/T 8691-2013: Knife Gate Valves without Bonnet
• GB/T 15188.2: Face-to-Face and End-to-End Dimensions of Valves
• GB 5796.1 - 5796.4: Trapezoidal Threads for Valve Stems and Stem Nuts – Basic Dimensions and Tolerances
• GB 9131: Pressure-Temperature Ratings for Valve Body Materials
• GB 12229: Specification for WCB Material Used in Valve Bodies
• GB 12222: Connection Dimensions for Valve Stands and Actuators International Standards
• MSS SP-151: Shell and Seat Seal Pressure Testing Requirements and Acceptance Criteria for Knife Gate Valves
• MSS SP-135: Structural Requirements for High-Pressure Knife Gate Valves (Including Lug-Type and Wafer-Type)
• AWWA C520: Knife Gate Valves for Water, Wastewater, and Reclaimed Water Applications (Covering Different Materials and Structures)
• MSS SP-154: Low-Pressure Stainless Steel Knife Gate Valves for Double Block and Bleed (DBB) Service
• MSS SP-152: Knife Gate Valves for Double Block and Bleed (DBB) Service (Cast or Fabricated, with or without Bonnet)
• MSS SP-146: Structural Requirements for High-Pressure Cast Iron and Ductile Iron Lug-Type, Wafer-Type, and Flanged Knife Gate Valves
• MSS SP-81: Stainless Steel or Stainless Steel-Lined, Bonnetless, Flanged Knife Gate Valves
• MSS SP-148: Low-Pressure Carbon Steel, Cast Iron, or Ductile Iron, Unlined, Bonnetless Knife Gate Valves
• SAA AS 6401: Knife Gate Valves for Water Engineering Applications
• ASME B16.10: Face-to-Face and End-to-End Dimensions of Valves
Audited Supplier 
){kind=link}