The valve pressure testing standards and specifications aim to ensure that the valve can withstand the expected working pressure and maintain good sealing performance during use. The common types of valve pressure testing include shell testing, sealing testing, and air tightness testing. The following are the main international standards and regulatory requirements.
Common valve pressure testing standards ：
GB/T 13927-2008 "Industrial Valve Pressure Test": Valve pressure test standard, applicable to pressure testing of industrial valves, including strength testing and sealing testing.
API 598 "Valve Inspection and Testing": developed by the American Petroleum Institute and applicable to most types of industrial valves. The API 598 standard specifies the shell pressure test, seat leakage test, and air tightness test of valves.
ASME B16.34 specifies the requirements for valve design, materials, manufacturing, and pressure testing.
ISO 5208 "Industrial Valve Pressure Testing": This is an industrial valve pressure testing standard developed by the International Organization for Standardization (ISO), providing detailed pressure testing and acceptance requirements.
The pressure testing standards and specifications for valves mainly focus on three aspects: strength, sealing, and air tightness, with the aim of ensuring safe operation of the valve under design conditions and maintaining good sealing performance for a long time. The valve shell strength test is to inspect the strength of the valve shell and cover, ensuring that they will not experience mechanical failure when working at rated pressure. Usually 1.5 to 2 times the design pressure of the valve, using water or oil as the medium. The sealing test is to test the sealing performance of the valve seat when the valve is closed, ensuring that the valve will not leak when closed. The sealing test is generally conducted under working pressure, and some specifications require testing at 1.1 times the working pressure. The airtightness test uses gases such as air and nitrogen instead of liquids for sealing testing, usually used to test valves with small leaks or in specific situations where liquids cannot be used. The gas pressure is usually 1.1 times the working pressure.

The valve airtightness test bench is a device specifically designed to test and verify the airtightness and leakage rate of valves under different pressure conditions. The specific working test requirements are as follows.

Testing medium: Different tests require different media. Liquid tests commonly use water or oil, while gas tests use air or nitrogen. For special medium valves, corresponding media need to be used for testing.

Test duration: Depending on the standard and valve size, large-diameter valves may require a longer testing time, typically 5 minutes or more.
Leakage level requirements: For example, API 598 standard specifies the maximum allowable leakage of valves, ranging from zero leakage to small leakage levels, depending on the valve type and application field.
Valve opening and closing test: Some standards also require multiple cycles of valve operation testing to ensure that the valve can open and close normally and maintain sealing.
Low and high temperature tests: For valves operating at extreme temperatures, pressure and sealing tests under low and high temperature conditions are required.
Corrosion resistance testing: For valves working in corrosive media, corrosion resistance testing is also required to ensure that the performance of the valve will not be affected by corrosion during long-term use.