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Pressure test method for pressure reducing valve of Suzhou commercial water heater

Pressure test method for pressure reducing valve of Suzhou commercial water heater

① The strength test of the pressure reducing valve is generally assembled after a single piece test, and it can also be tested after assembly. Strength test duration: lmin for DN <50mm; greater than 2min for DN65 ~ 150mm; greater than 3min for DN> 150mm. After the bellows and the component are welded, the maximum pressure after applying the pressure reducing valve is 1.5 times, and the strength test is performed with air.

② The tightness test shall be carried out according to the actual working medium. When testing with air or water, the test is performed at 1.1 times the nominal pressure. When testing with steam, the test is performed at the maximum working pressure allowed at the working temperature. The difference between the inlet pressure and the outlet pressure is required to be not less than 0.2MPa.

The test method is: After the inlet pressure is adjusted, gradually adjust the adjusting screw of the valve so that the outlet pressure can be sensitively and continuously changed within the range of the maximum and minimum values without stagnation or jamming.

For steam pressure reducing valve, when the inlet pressure is adjusted, close the valve and close the valve. The outlet pressure is the highest and lowest value. Within 2 minutes, the increase of the outlet pressure should meet the requirements in Table 4.176-22. The volume meets the requirements specified in Table 4.18. For water and air pressure reducing valves, when the inlet pressure is adjusted and the outlet pressure is zero, the pressure reducing valve is closed to perform a leak test, and no leakage is qualified within 2 minutes.


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