Application of helium mass spectrometer leak detector for metal bellows: ensuring sealing and reliability

As an elastic element widely used in fields such as aerospace, aviation, ships, and nuclear power, the metal bellows plays an important role in sealing and displacement compensation in valves and pipelines. However, the leakage of the bellows assembly may lead to the failure of the entire system or subsystem. Therefore, ensuring its tightness is crucial for the reliability and economy of the equipment.

Metal Bellows

Metal bellows have high requirements for airtightness. Traditional leakage testing methods such as dye penetration testing, refrigerant sniffing, or bubble testing can no longer meet the requirements of customers' industrial production. Therefore, the introduction of a helium mass spectrometer leak detector has become a necessary means for detecting leaks in metal bellows.

The leak detection method for metal bellows needs to be carried out according to their actual usage status and must be non-destructive. The maximum test pressure is determined according to the elastic limit of the material being tested.

During the leak detection process of metal bellows, the negative pressure method is used to simulate the working conditions of use. The specific steps are as follows:

Connect one end of the vacuum bellows to the leak detection port of the helium mass spectrometer leak detector, and block the other end with a blind cover.

Press the "Start" button on the leak detector, and the leak detector starts to evacuate the bellows.

After meeting the detection conditions, use a spray gun to spray helium at the position that needs to be detected. If there is a leak in the product, helium will enter the interior of the product and be drawn into the leak detector. When the set alarm value is exceeded, the leak detector will display the leak rate and emit an audible and visual alarm, indicating that it is unqualified.

Helium Leak Detection for Bellows

According to actual needs, Anhui Nuoyi NHJ-400 helium mass spectrometer leak detector or module leak detector can be selected for detection.

Helium mass spectrometry leak detection is a crucial link in the production process of metal bellows, which directly determines the production quality of the bellows. In order to ensure the accuracy and convenience of detection, under different forms of bellows, the optimal leak detection method can be selected to improve the performance of the bellows and enhance the detection efficiency.