| 摘要 |
A actuating head of a double-acting or lift and force pump for ejecting a product from a container includes an outlet duct leading to an ejection opening, wherein a valve closing piece is arranged in the outlet duct. Together with the outlet duct, the valve closing piece forms a check valve which, when the actuating head is actuated, is opened by the pressure of the product and allows the product to flow into a space defined by the inner side of the outlet duct and the circumference of the valve closing piece. This space is connected through at least one transverse groove to the ejection opening. The valve closing piece is elastically deformed by the product pressure when the actuating head is actuated and opens the check valve. The valve closing piece borders against the transverse groove and rests with its rear side against a radially inwardly protruding shoulder of the outlet duct. The rear side of the valve closing piece is provided with at least one radial groove and the portion of the outlet duct located on the rear side of the valve closing piece can be connected through the at least one radial groove to the space, wherein the valve closing piece has a circumferential sealing lip which releases the flow of the product as a result of the product pressure when the actuating head is actuated.
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