Back Pressure Occlusion

Back Pressure Occlusion
Leak and back-pressure occlusion test
Testing Automotive part with a check valve for leak and back pressure occlusion.

A company that manufactures automotive parts needed a leak test method for a part containing passages connected by a check valve. It was necessary to test both the integrity of the part and to confirm that the check valve was operating properly.

A two-port TME Solution leak and flow test instrument was modified to perform three linked tests on the part:


1. A standard pressure decay leak test. In this test, the inlet and outlet ports were blocked and the part was pressurized on both sides of the check valve. Decay in the pressure during the test time indicates a leak in the housing of the part.

2. A back-pressure occlusion test at a higher pressure on one side of the check valve to confirm that it is opening properly. In this test, the outlet ports are blocked and pressure is applied to one side of the check valve.

3. A second back-pressure occlusion test on the other side of the check valve at a lower pressure to confirm that it is closed. In this test, pressure is applied to the other side of the check valve.

The instrument cycles through the three tests and reports the test results on the screen.