Importance

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Abstract

A pump assembly for storing and discharging a liquid such as a chemical solution includes a substantially cylindrical container for storing the liquid therein. A pump is mounted on one end of the container. The pump has a suction port for drawing the liquid from the container and an outlet port for discharging the liquid. A gasket is slidably inserted in the opposite end of the container in contact with the liquid stored in the container, for sealing the liquid in the container. The gasket is slidable toward the pump when the liquid stored in the container is reduced by the pump. A slanted portion is disposed in one end of the container and has a slanted surface extending continuously from an inner peripheral surface of the container and converging away from the gasket. The suction port of the pump communicates with the interior space of the container substantially at a converging end of the slanted surface. Any trapped air is collected between the slanted surface and the liquid contained in the container, and can be discharged from the container by the pump before the liquid is discharged from the container by the pump.

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First Claim