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NASH two-stage cone vacuum pump

2021-06-23View Original

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I would like to ask the experts here: for the NASH two-stage cone vacuum pump, when performing vacuum pumping during the cold start of the turbine, it is stated in the instructions that only the first stage is used to create vacuum, with the check valve of the second stage remaining closed. It will then open automatically, and the second stage begins to operate. What I want to ask is when does this cause the check valve to open and close, and how does this device determine that?

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