1. Intermediate pressure test
There is a special sealing test to test the sealing performance of the three-piece all-inclusive ball valve, such as an intermediate pressure test. In the intermediate pressure test method, first open the valve plate of the high-temperature three-piece all-inclusive ball valve, operate, etc., until the pressure in the three-piece all-inclusive ball valve rises to the standard value, then lower the gate, and then take out the high-temperature three-piece ball valve from the pipeline. Chip all-inclusive ball valve, check the seal for leaks. In addition to putting the three-piece all-inclusive ball valve into the pipeline for the simulated experiment, you can also directly open the top bonnet of the three-piece all-inclusive ball valve, inject the liquid medium to the standard value, and then check the high temperature three-piece all-inclusive ball valve. There is no medium leakage or leakage on both sides, and no leakage means that the three-piece all-inclusive ball valve has good sealing performance.
Second, the test attention
The premise for the accurate results of the intermediate pressure test includes the following points:
1. During the test operation, the high temperature three-piece all-inclusive ball valve needs to be filled with medium, and it must be a liquid medium, such as water or kerosene, so that the pressure in the three-piece all-inclusive ball valve cavity reaches the specified value.
2. The sealing surface and the sealing parts on both sides of the three-piece all-inclusive ball valve should be kept clean, and be careful not to be scratched by the edge during operation.
3. The high-temperature three-piece all-inclusive ball valve is used in the pipeline. If the direction of medium transmission has been specified, the intermediate pressure test should also be applied according to the prevailing medium.
4. The sealing performance of the valve device is limited by the intermediate pressure test, and it is only suitable for checking the three-piece all-inclusive ball valve with a nominal diameter of DN32 or more.
In short, the intermediate pressure test method can be used to test whether the sealing performance of the high-temperature three-piece all-inclusive ball valve is qualified, especially when you are worried about the quality of the three-piece all-inclusive ball valve purchased, it is very necessary to learn these testing methods.