What makes a one-way seat valve open and closed?

28 Jul, 13:55

July 28, 2021, 1:55 p.m.
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It is higher pressure on one side of the seat than on the other side, and it is shut manually or by change of pressure on the seat

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28 Jul, 13:56

July 28, 2021, 1:56 p.m.
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