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背压阀为隔膜式，能调整设定压力。
It is diaphragm type back pressure valve.
youdao
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复杂的管道可采用建立背压的方法进行清管、测径。
Complex pipe can be established by the method of back pressure pigging, caliper.
youdao
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复杂的管道可采用建立背压的方法进行清管、测径。
Complex pipe can be established by the method of back pressure pigging, caliper.
youdao