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The ANSI gate valves provided by Weldon in this section mainly follow the normative dimensions and pressure classes from American Petroleum Institute (API) and American National Standards Institute (ANSI), including API 600, API 6D, ASME B16.34, ASME B 16.5, ASME B16.10, ect.

API 600 gate valve from Weldon covers bolted bonnet steel gate valves for the petroleum and natural gas industries, is the primary purchase specification of steel gate valveANSI Gate valves design and construction criteria are detailed, as well as materials and trim designations.

API 6D valves from Weldon cover ball valves, check valves, gate valves for pressure ratings up to Class 2500, is the primary standard for valves used in pipeline service, Occasionally refinery and petrochemical purchasers will reference the more stringent testing requirements of API 6D.
 
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