| 摘要 |
The pump possesses an inlet and an outlet for the fluid to be pumped, a housing bounded at one end by an end member and enclosing an inner space, in which a piston is displaceably guide. The inlet is connected, by way of the end members and by way of a first back-pressure valve, with the pump chamber provided between the end member and the piston, said pump chamber being connected, by way of the end member and a second back-pressure valve, with the outlet. The piston is equipped with a third back-pressure valve, which additionally connects the inlet with the pump chamber, and makes it possible to largely prevent-during the suction strokes and particularly during the beginning phases thereof-any pressure drops from occurring, that could cause in the pump chamber the reconversion of fluid from the liquid to the gaseous state.
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