The throttle valve easily loses its stability in the vacuum leak detection process, resulting in a failure to check the leak rate so as to cause the parts to be destroyed. For several typical corrugated pipe structure, this paper proposes a plan of response, given the detailed plan to leak detection equipment and its strength criterion, which has certain guiding significance for practical engineering use.

In the vacuum experiment, is not the risk of being busy pumping system is general thought, it still contains two kinds of hidden risks, one is crushed (implosion), one is the risk of people entering the container even once and similar in atmosphere may produce, because most of the vacuum experiment utilizes gas like helium including nitrogen and hydrogen, these can not sustain life, cause the container does not contain sufficient inhaled atmosphere and cause infarction.

"Implosion" refers to the test tool because of its stiffness to support the lack of atmospheric pressure and attack deformation, distortion, crack status, resulting in the workpiece can not be properly sealed, leak things can not stop or even damage the workpiece scrapped, instrument to threaten the personal safety of staff leak, so this class is inspection tools should be accepted in the precaution of leak detection response.

As the compensation element in the high temperature vacuum throttle system in use is very common, it is needed to stop the device before using the vacuum leak detection, because of its lack of rigidity, precautions must be accepted leak response (especially on the corrugated metal element thickness less than 1 mm, single tube).