The ASME standard for gate valves mainly involves design, material and pressure-temperature grade requirements. The core standard is ASME B16.34, and it needs to be used in conjunction with other specifications, as follows:
1. Core standard: ASME B16.34
Definition scope: ASME B16.34 is a general specification in the field of American standard valves, covering the pressure-temperature rating, material selection and design basis requirements of gate valves, and is applicable to steel valves with all connection methods (flanges, threads, welding, etc.).
Core content:
Specify the minimum wall thickness, pressure bearing capacity and temperature correspondence of the valve to ensure safe operation under high temperature or high pressure conditions;
Specify the material selection standards for valve body, valve cover and other components (such as ASTM A216 WCB, A351 CF8M, etc.).
2. Supporting standards and supplementary specifications
Structural length standard ASME B16.10
Define the structural length (end face spacing) of the gate valve to ensure matching with the pipeline flange, which directly affects the installation compatibility.
Flange and end connection standards
ASME B16.5: Flange size and pressure rating specification, applicable to the matching of valves and pipe flanges; ASME B16.25: Butt-weld end design standard, for the shape and size of the groove of the welded valve end.
3. Cooperative application with other standards
API 600: Supplementary standard for steel gate valves for the petroleum industry, combined with ASME B16.34 to refine the sealing, testing and manufacturing process requirements (such as bolted valve cover design).
API 602: Compact design requirements for small-diameter forged steel gate valves, which must be implemented under the ASME B16.34 pressure rating framework.
4. Typical application scenarios
ASME standard gate valves are widely used in:
Petrochemical high-pressure pipelines (Class 150~2500);
Power system high-temperature steam control (such as the main steam pipeline of a thermal power plant);
Compact instrument root valve (requires reference to API 602 and ASME B16.34 joint design).
5. Selection suggestions
Prioritize the selection of valve pressure level and material based on ASME B16.34; Combined with API 600/602 to meet the special working conditions of industries such as petroleum and chemical industry; When matching flanges, refer to pipeline connection standards such as ASME B16.5/B16.47.
