Dispensing pump for a fluid product

1. A dispensing pump for a fluid product, including a pump body ( 10 ) in which at least one piston ( 20 , 30 ) slides, wherein a pump chamber ( 40 ) is defined between an input valve ( 50 ) and an output valve ( 60 ), and said pump body ( 10 ) extends towards the inside of a tank ( 2 ) through a plunger tube ( 70 ), said input valve ( 50 ) being sealably connected to said plunger tube ( 70 ), the pump comprising a return spring ( 5 ) which brings said pump back towards a rest position, wherein said spring is positioned out of any contact with the fluid product, and wherein the input valve ( 50 ) includes an input valve seat ( 51 ) movable within said pump body ( 10 ) and an input valve component ( 59 ), which selectively seals and opens said input valve ( 50 ); and

wherein the pump body comprises an upper aperture in which an actuating rod is assembled, and a lower aperture in which the plunger tube is assembled.

2. The pump according to claim 1 , wherein said pump body ( 10 ) or said plunger tube ( 70 ) includes at said lower aperture of the pump body ( 10 ), a tubular portion ( 80 ) axially extending inside the pump body ( 10 ), wherein said input valve ( 50 ) is sealably connected to said tubular portion ( 80 ).

3. The pump according to claim 2 , wherein said input valve seat ( 51 ) includes, upstream from said input valve component ( 59 ) in the flow direction of the product, an axial tube ( 55 ), an end ( 56 ) of which sealably cooperates with said tubular portion ( 80 ) of the pump body ( 10 ) or plunger tube ( 70 ).

4. The pump according to claim 1 , wherein the return spring ( 5 ) of the pump is positioned in the pump body ( 10 ) between the input valve seat ( 51 ) and the pump body or a component ( 70 ) securely fixed to the pump body ( 10 ).

5. The pump according to claim 3 , wherein said axial tube ( 55 ) of the input valve seat ( 51 ) sealably slides inside said tubular portion ( 80 ).

6. The pump according to claim 3 , wherein the input valve seat ( 51 ) includes, upstream from the valve component ( 59 ), a radial through-hole ( 53 ) for allowing air contained in the pump chamber ( 40 ) to be discharged towards the tank before the first actuation of the pump.

7. The pump according to claim 1 , wherein the output valve ( 60 ) includes an output valve seat ( 61 ) and an output valve component ( 69 ), wherein said output valve component ( 69 ) includes an expanded head ( 68 ) cooperating with said output valve seat ( 61 ), wherein said output valve component ( 69 ) is attracted to a closed position through the pressure of the product contained in the pump chamber ( 40 ), and mechanically moved to an open position at the end of the actuation stroke of the actuating rod ( 1 ).

8. A dispensing device for the fluid product including a tank of the fluid product, characterized in that the dispensing device includes a pump according to claim 1 .

9. A dispensing pump according to claim 1 , wherein the input valve component is a ball.

10. The pump according to claim 1 , wherein the return spring ( 5 ) of the pump is positioned in the pump body ( 10 ) between the input valve seat ( 51 ) and a portion of the plunger tube securely fixed to the pump body.

11. The pump according to claim 1 , wherein the spring is disposed outside the pump chamber.

12. The pump according to claim 1 , wherein the actuating rod slides axially within the upper aperture in a same direction as the at least one piston.

13. The pump according to claim 12 , wherein the upper aperture is above the at least one piston and pump chamber.

14. The pump according to claim 13 , further comprising a second piston disposed below the at least one piston.

15. The pump according to claim 1 , wherein the actuating rod is above the pump chamber.

16. A dispensing pump for a fluid product, including a pump body ( 10 ) in which at least one piston ( 20 , 30 ) slides, wherein a pump chamber ( 40 ) is defined between an input valve ( 50 ) and an output valve ( 60 ), and said pump body ( 10 ) extends towards the inside of a tank ( 2 ) through a plunger tube ( 70 ) of said input valve ( 50 ) being sealably connected to said plunger tube ( 70 ), the pump comprising a return spring ( 5 ) which brings said pump back towards a rest position, wherein said spring is positioned out of any contact with the fluid product, and wherein the output valve ( 60 ) includes an output valve seat ( 61 ) and an output valve component ( 69 ), wherein said output valve component ( 69 ) includes an expanded head ( 68 ) cooperating with said output valve seat ( 61 ), wherein said output valve component ( 69 ) is attracted to a closed position through the pressure of the product contained in the pump chamber ( 40 ), and mechanically moved to an open position at the end of the actuation stroke of the actuating rod ( 1 ); and

wherein the pump body comprises an upper aperture in which the actuating rod is assembled, and a lower aperture in which the plunger tube is assembled.

17. The pump according to claim 16 , wherein the spring is disposed outside the pump chamber.

18. The pump according to claim 16 , wherein the actuating rod slides axially within the upper aperture in a same direction as the at least one piston and wherein the upper aperture is above the at least one piston and pump chamber.

19. The pump according to claim 18 , further comprising a second piston disposed below the at least one piston.

20. The pump according to claim 16 , wherein the actuating rod is above the pump chamber.