| 摘要 |
A proportioning valve for a container holding a product which is to be dispensed in predetermined quantities with each operation of the valve under the influence of a compressed fluid, said valve essentially comprising a body having a cylinder which opens on one side on the outside and on the other hand onto a plunger tube which extends almost as far as the bottom of the container, a unit which is slidable in the cylinder and forms a valve being actuated in one direction by depressing the actuating button mounted on the outside of the container at the end of the unit, said button having a nozzle for expelling the product, and in the other direction by a resilient resetting means, characterized in that a proportioning chamber made of a flexible material which opens into the side wall of the cylinder is arranged at least partially along the length of the plunger tube to enclose the latter, and is formed by two dihedrons which are symmetrical in relation to the plunger tube and two semi-cylinders which are capable of bearing against both sides of the plunger tube, the assembly being such that in the course of a push-release working cycle, the proportioning chamber is filled, then communication between the proportioning chamber and the interior of the container is cut, and the proportioning chamber and the nozzle of the actuating button are connected, the proportioning chamber being deflated and evacuated of its contents under the pressure of propellent fluid in the container.
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