Patent ID: 6142746
Filing Date: 2000-11-07
Classification: F04B,F04F

Abstract:
A pump device comprising:a supply tube for a liquid with a relatively low head;an accumulator connected to the supply tube via a non-return valve;an outlet tube from the accumulator for liquid with a relatively high head; andan outlet valve, provided at the supply tube after the accumulator, said outlet valve opens and shuts an outlet at the supply tube,wherein the outlet valve comprises a damper movable between an open position in which the outlet opening is left open, and a closed position in which the outlet opening is closed,wherein the damper is arranged rotatable around a first axis and is provided with a variable first weight, which provides a torque acting in the direction towards the open position of the outlet valve and thus influences a time interval between the opening and the closing of the outlet valve,wherein said pump device further comprises a vessel provided, cooperating with the outlet valve, said vessel being movable between a first position and a second position, whereas the outlet valve in the first position is kept open when the vessel continuously collects flowing liquid from the outlet, until the collected liquid brings the vessel to take the second position in which the outlet valve is kept closed until the liquid flows out from the vessel, whereby the vessel will return to its first position, andwherein the damper is rotatable around a second axis between the open and closed positions, and the vessel is provided with a first closure element which, when the vessel moves from said first position to the second position, acts upon a second element at the damper in order to close the outlet valve.