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An actuating head ( 12 ) of a double-acting pump ( 1 ) for ejecting a product ( 38 ) from a container ( 2 ) includes an outlet duct ( 13 a- 13 d ) leading to an ejection opening ( 16 ), wherein a closing piece ( 18 ) biased by a spring ( 17 ) is arranged in the outlet duct. The closing piece (

An actuating head ( 12 ) of a double-acting pump ( 1 ) for ejecting a product ( 38 ) from a container ( 2 ) includes an outlet duct ( 13 a- 13 d ) leading to an ejection opening ( 16 ), wherein a closing piece ( 18 ) biased by a spring ( 17 ) is arranged in the outlet duct. The closing piece ( 18 ) directly seals the ejection opening ( 16 ) under the force of the spring ( 17 ) and the closing piece ( 18 ) releases as a result of the pressure exerted when actuating the double-acting pump ( 1 ) the flow of the product ( 38 ) through the outlet duct ( 13 a- 13 d ) and through the ejection opening ( 16 ) against the force of the spring ( 17 ). For simplifying the construction and for avoiding the danger of contamination of the product, it is ensured according to the present invention that a first outlet duct section ( 13 d ) following the ejection opening ( 16 ) is surrounded by a tube ( 15 ) in which the closing piece ( 18 ) is sealingly slideably guided and which is inserted in a bore ( 14 ) in the body of the actuating head ( 12 ), wherein the bore ( 14 ) defines between itself and the tube ( 15 ) an annular space forming a second outlet duct section ( 13 b ), wherein the annular space is connected through a third outlet duct section ( 13 c ) traversing the wall of the tube ( 15 ) to the first outlet duct section ( 13 d ).

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1. Actuating head ( 12 ) of a double-acting pump ( 1 ) for ejecting a product ( 38 ) from a container ( 2 ), wherein the actuating head ( 12 ) has an outlet duct ( 13 a - 13 d ) leading to an ejection opening ( 16 ), wherein a closing piece ( 18 ) biased by a spring ( 17 ) is arranged in the out

1. Actuating head ( 12 ) of a double-acting pump ( 1 ) for ejecting a product ( 38 ) from a container ( 2 ), wherein the actuating head ( 12 ) has an outlet duct ( 13 a - 13 d ) leading to an ejection opening ( 16 ), wherein a closing piece ( 18 ) biased by a spring ( 17 ) is arranged in the outlet duct, wherein the closing piece ( 18 ) in its closed position directly seals off the ejection opening ( 16 ) under the force of the spring ( 17 ) and wherein the closing piece ( 18 ) releases the flow of the product ( 38 ) through the outlet duct ( 13 a- 13 d ) and through the ejection opening ( 16 ) as a result of the pressure occurring during actuation of the double-acting pump ( 1 ) against the force of the spring ( 17 ), wherein a first outlet duct section ( 13 d ) following the ejection opening ( 16 ) is surrounded by a tube ( 15 ) in which the closing piece ( 18 ) is sealingly slidingly guided and which is placed in a bore ( 14 ) in the body of the actuating head ( 12 ), wherein the bore ( 14 ) defines between itself and the tube ( 15 ) an annular space forming a second outlet duct section ( 13 b ), wherein the annular space is connected to the first outlet duct section ( 13 d ) through a third outlet duct section ( 13 c ), which traverses the wall of the tube ( 15 ). 2. Actuating head according to claim 1, wherein the closing piece ( 18 ) has a piston ( 19 ) which seals against the inner side of the outlet duct ( 13 a - 13 d ), wherein the piston ( 19 ) has a piston rod ( 20 ) which in the closed position of the closing piece ( 18 ) protrudes with an end portion ( 20 a ) tightly in the ejection opening ( 16 ). 3. Actuating head according to claim 2, wherein the portion ( 20 b ) of the piston rod ( 20 ) adjacent the end portion ( 20 a ) has a greater diameter than the ejection opening ( 16 ) and in the closed position of the closing piece ( 18 ) the portion ( 20 b ) rests against the inner rim of the ejection opening ( 16 ) under the force of the spring ( 17 ). 4. Actuating head according to claim 2 or 3, wherein the piston ( 19 ) has a circumferential sealing lip ( 21 ) which permits passage of a medium only in the direction toward the ejection opening ( 16 ). 5. Actuating head according to claim 4, wherein the sealing lip ( 21 ) is formed by a cup-shaped material. 6. Actuating head according to one of claims 1 to 3, wherein the closing piece ( 18 ) is of a rubber-elastic material with an excess dimension of the end portion ( 20 a ) relative to the diameter of the ejection opening ( 16 ). 7. Actuating head according to claim 6, wherein the rubber-elastic material is a plastic material.