| 摘要 |
A finger operated pump assembly comprising a pump body having a base supporting an outer housing and an inner housing and defining a first portion of a compression chamber therebetween. A piston is at least partially received within the pump body and is slidable relative to the pump body along an inner surface of the outer housing. The piston has an annular lip for providing a sealing engagement with the pump body, and the piston is provided with a piston outlet defined by a poppet valve seat. A poppet is accommodated by the inner housing and the poppet is biased away from the base into engagement with the poppet valve seat by a spring to normally close the piston outlet. The poppet, the base and the inner housing all define an interior cavity. A peripheral passageway communicates with the compression chamber, and the passageway includes a one-way valve which allows the product to flow along the passageway toward the compression chamber. The interior cavity is provided with a ventilation port which allows the interior cavity, during operation of the poppet, to operate at ambient pressure. The pump body is coupled to a turret which is connected to a closure.
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