Views: 0 Author: J-VALVES Publish Time: 2024-04-20 Origin: Site
(I) Implementation Standards
• American standard gate valves: mainly follow American Petroleum Institute (API) standards such as API 600 and API 6D. These standards put forward strict requirements for the design, manufacture, inspection and testing of valves to ensure the reliability of valves in high-pressure, high-temperature and corrosive environments.
• National standard gate valves: follow Chinese national standards (GB), such as GB/T 12234 and GB/T 12221. These standards are mainly for application requirements in the domestic market and provide detailed specifications for the structure, size, material and performance of valves.
(II) Pressure Ratings
• American standard gate valves: The pressure rating range is relatively wide, usually from Class 150 to Class 2500, suitable for high-pressure working conditions.
• National standard gate valves: The nominal pressure range is generally from PN16 to PN100, suitable for medium and low pressure working conditions.
(III) Structural Length
• American standard gate valves: The structural length standard is ASME B16.10, which is usually shorter and suitable for compact spaces.
• National standard gate valves: The structural length standard is GB/T 12221, with a wide size range and suitable for various application scenarios.
(IV) Flange Standards
• American standard gate valves: The flange connection standards are ASME B16.5, ASME B16.47, etc.
• National standard gate valves: The flange connection standards are GB/T 9113, JB/T 79, etc.
(V) Inspection Requirements
• American standard gate valves: The inspection standards are API 598, API 600, etc., which have strict requirements on the sealing performance, strength and durability of valves.
• National standard gate valves: The inspection standards are GB/T 12224, GB/T 12237, etc., focusing on the overall performance and reliability of valves.
• National standard gate valve: Widely used in domestic medium and low pressure scenarios such as municipal water supply, sewage treatment, and chemical production.
(II) Material selection• National standard gate valve: The material selection is relatively diverse, including cast iron, cast steel, stainless steel, etc., to meet different pressure and medium requirements.
(III) Sealing performance• National standard gate valve: The sealing surface materials are diverse, including iron gaskets, stainless steel gaskets, etc., suitable for medium and low pressure working conditions.
(IV) Operation mode
