초록 ▼

A pump for dispensing liquid from a container is disclosed and comprised a cylinder, and a piston having an interior chamber with a valve member disposed therein, the valve member having a cylindrical surface at one end portion thereof. An inlet valve is provided and includes a sleeve having a cylin

A pump for dispensing liquid from a container is disclosed and comprised a cylinder, and a piston having an interior chamber with a valve member disposed therein, the valve member having a cylindrical surface at one end portion thereof. An inlet valve is provided and includes a sleeve having a cylindrical surface having a diameter sized to frictionally engage, provide a liquid seal and slide with respect to the cylindrical surface of the valve member. The inlet valve sleeve seats upon an annular ring extending around the inlet opening of the cylinder and seals the interior chamber of the pump with respect to the container. In accordance with an aspect of the invention, the pump may be non-venting such that a vacuum builds in the container as liquid is dispensed, and a sealing collar is provided to seal the pump with respect to the container.

대표청구항 ▼

A non-throttling pump for dispensing liquid from a container comprising: a cylinder having an inlet for receiving liquid from said container: a piston slidable reciprocally in said cylinder, said piston having a interior chamber along its length and having an opening at one end thereof for dispensin

A non-throttling pump for dispensing liquid from a container comprising: a cylinder having an inlet for receiving liquid from said container: a piston slidable reciprocally in said cylinder, said piston having a interior chamber along its length and having an opening at one end thereof for dispensing liquid from said chamber, said piston being slidable against a bias through a downward stroke and with said bias through an upward stroke; a valve member positioned in said chamber and having a dispensing valve at one end portion biased toward a position closing said opening, said valve member moveable under liquid pressure against said bias away from said opening to dispense liquid from said chamber, said valve member having a second end portion having a cylindrical surface; an inlet valve for opening and closing said inlet of said cylinder, said inlet valve including a cylindrical surface having a diameter sized to frictionally engage, provide a liquid seal, and slide with respect to said cylindrical surface of said valve member, said inlet valve moving with said second end portion of said valve member until seated on and prevented from further movement with respect to said inlet, said inlet valve sliding with respect to said valve member end portion and moving with respect to said piston during further travel of said valve member with respect to said cylinder, said movement of said piston reducing the volume of said chamber thereby increasing pressure in said chamber to provide a positive pressure differential between said chamber and said container, said inlet valve moving with said valve member and away from said inlet and opening said inlet during an initial portion of said upward stroke of said piston to open said inlet and suction liquid during substantially the entire upward stroke of said piston.