The gate valve uses the gate as the opening and closing part. To judge whether an industrial valve product is qualified, sealing and pressure are two very important indicators. So, how to test whether the high temperature gate valve is qualified?

1. Intermediate pressure test

There are special sealing tests to check the sealing performance of gate valve meters, such as intermediate pressure test. The intermediate pressure test method, first open the valve plate of the high temperature gate valve, operate, etc., until the pressure in the gate valve rises to the standard value, then lower the gate plate, then take out the high temperature gate valve from the pipeline, check the seal to see if there is any leakage . In addition to putting the gate valve into the pipeline for the simulated experiment, you can also directly open the top bonnet of the gate valve, inject the liquid medium to the standard value, and then check whether there is medium leakage or leakage on both sides of the high-temperature gate valve. No leakage means that The gate valve has good sealing performance.

Second, the test attention

The premise that the results of the intermediate pressure test are accurate include the following points:

1. During the test operation, the high temperature gate 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 gate valve cavity reaches the specified value.

2. The sealing surface of the gate valve and the sealing parts on both sides should be kept clean, and be careful not to be scratched by the edge during operation.

3. The high-temperature gate 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 gate valve with a nominal diameter of DN32 or more.

In a word, the intermediate pressure test method can be used to test whether the sealing performance of the high temperature gate valve is qualified, especially when you are worried about the quality of the gate valve purchased, it is very necessary to learn these testing methods.