Fluid delivery device

A gas-pressurized device adapted to deliver fluids under pressure, consisting essentially of:

• an internal receptacle 1 of variable volume in a form or shape of a pouch or flexible container of generally cylindrical shape consisting essentially of:
• a lower closed extremity E1 and
• an upper open extremity which is lengthened as prolongation E2, the said receptacle which has no other opening and which is slightly conical in direction of its lower extremity,
• further comprising pleats 2 which are exclusively longitudinal and which extend from the upper to the lower extremity,
• an actuator C housed on said internal receptacle, permitting to open a valve to enable the aforementioned fluid to be delivered, the said actuator comprising a mounting cup M comprising a circular external edge or rim M1 and only one concentric circular axial opening 12 by which it is fixed through crimping on the prolongation E2 of the internal receptacle,
• an external receptacle 4 capable of resisting to an elevated internal pressure which is superior to 20 bars, said external receptacle which is of general cylindrical shape and which comprises a lower closed extremity and an upper extremity comprising a circular opening which is the only opening of the external receptacle, the said opening being demarcated by a circular rim or edge 5 on which is fixed by crimping the external edge M1 of the mounting cup,
• a pressurized variable volume of neutral gas or air delimited between the internal and the external receptacles, wherein the variable volume of neutral gas or air is under a pressure sufficient to exert on the internal receptacle of variable volume a pneumatic constraint sufficient to permit the delivery of the therein contained fluid when the valve is operated by the actuator,
• wherein the said internal receptacle comprises no further opening permitting feeding therein the fluid to be delivered and neither the external receptacle nor the mounting cup comprise a further opening permitting filling with air or neutral gas the volume delimited between the internal and the external receptacle,
• wherein the leak tightness, at the level of the crimping by the concentric circular axial opening 12 of the mounting cup M on the prolongation E2, in a position close to the edge 3 of the opening of the internal receptacle 1, is ensured by a gasket 8 consisting of an elastomeric material, in particular rubber and, at the level of the crimping of same mounting cup M onto the rim or edge 5 of the opening of the external receptacle 4 by a gasket 9 consisting of the same material as gasket 8, or, when the external receptacle (4) is made in a material with sufficient elastic characteristics, without said gasket 9, the crimping of mounting cup M onto the extremity of the prolongation E2 of the internal receptacle 1 being made possible by an external return or edge 10 provided at its extremity.