초록 ▼

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 chambe

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.

대표청구항 ▼

Pump for pumping a fluid comprising liquified gas, the pump comprising an inlet and an outlet for the fluid, a housing with an end member limiting an inner space in which a piston is displaceably guided towards and away from said end member wherein said inner space comprises a pump chamber between s

Pump for pumping a fluid comprising liquified gas, the pump comprising an inlet and an outlet for the fluid, a housing with an end member limiting an inner space in which a piston is displaceably guided towards and away from said end member wherein said inner space comprises a pump chamber between said end member and said piston, the pump also comprising fluid feeding means connecting said inlet through said end member with said pump chamber and comprising a first back-pressure valve, the pump further comprising fluid abducting means connecting said pump chamber with said outlet and comprising a second backpressure valve, wherein the piston comprises a third backpressure valve adapted to connect said inlet with said pump chamber wherein said first and third back-pressure valves are adapted to let fluid flow from said inlet to said pump chamber and said second back-pressure valve is closed while said piston is moved away from said end member and wherein the second back-pressure valve is open to permit fluid to flow from said pump chamber to said outlet and said first and third back-pressure valves are closed while said piston is moved toward said end member.