| 摘要 |
The dispensing pump comprises a pump body adapted for fluid tight communication with the opening of a container of flowable product to be dispensed. The pumpbody includes a stationary upstanding piston, a container vent opening, and collar surrounding the piston. An annular plunger is mounted for reciprocation on the piston to define a variable volume pump chamber. The piston has a valve controlled inlet passage and a plunger head is slidably disposed on the plunger for reciprocation and has means defining a variable volume accumulation chamber in open communication with the pump chamber.
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