What is the principle of negative pressure test?

Negative pressure test is a test method used to test the performance of gas seal. The principle is to create negative pressure in the measured area and observe whether there is air leakage inside. If there is no air leakage in the area to be measured, negative pressure should be maintained; If there is leakage, the negative pressure will be reduced due to the inflow of air.

Negative pressure test usually produces negative pressure in the area to be tested by using high-efficiency filtering devices, such as fans or vacuum pumps. Then use a pressure gauge to monitor the negative pressure value, and use an air detector to detect air leakage.

The negative pressure test can be used to detect the air tightness of buildings, industrial equipment and medical equipment. It can help to ensure indoor air quality and prevent fire and the spread of pollutants.