| 摘要 |
A non-pulsating, non-throttling, vented pumping system with pressure release features is disclosed. This pumping system provides continuous dispensing of fluent product from a container in a relatively non-pulsating discharge which may be a stream or spray. The pumping system includes a pressurizing compartment for receiving product from the container, a manually reciprocatable actuator for withdrawing product from the container through at least one check valve into the pressurizing compartment where it can be pressurized in a pressure stroke of the actuator, a storage compartment for receiving pressurized product from the pressurizing compartment upon movement of the actuator in its pressure stroke, an outlet passageway leading from the storage compartment for dispensing pressurized product, an accumulator piston slidably reciprocatable in the storage compartment and operable to open and close the outlet passageway, a spring biasing the accumulator piston to a rest position closing the outlet passageway, and a projection on the accumulator piston operable to open the check valve just prior to the closing of the outlet passageway by the accumulator piston for relieving pressure in the storage compartment to facilitate closing of the outlet passageway by the piston. The container is vented to the atmosphere through the pump. Since the accumulator piston opens and closes the outlet passageway only when the bias of the spring has been overcome or relieved as the case may be, the pump is non-throttling as well as non-pulsating and vented.
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