求翻译：6.8.2.2 升高、降低进口前端压力，检查稳压阀是否正常（关闭和打开压力相关不允许超过0.05MPa），并且关闭时不允许有泄漏，重复做20次。是什么意思？

6.8.2.2 increased to reduce imports of front-end pressure, check the regulator valve (close and open the pressure does not allow more than 0.05mpa), and close does not allow leakage, repeat 20 times.

6.8.2.2 elevates, reduces before the import the terminal pressure, the inspection constant voltage valve whether normal (closes and opens pressure correlation not to allow to surpass 0.05MPa), when closes does not allow to have divulging, the repetition makes 20 times.

6.8.2.2 imports rise, reducing front end pressure, inspect the regulator valve for normal (turn the pressure off and does not allow more than 0.05MPa), and leaks are not allowed on close, repeated 20 times.