Distributer for a product including a pressure bag and a non-ret

Details Distributer for a product including a pressure bag and a non-ret Distributer for a product including a pressure bag and a non-ret

1998-01-02

2000-07-11

Shaver, Kevin

Dispensing

With discharge assistant

Fluid pressure

22240216, 141 20, B65D 8300, B65B 104

Patent

active

060859458

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a distributor for a product under pressure. More specifically, the invention relates to such a distributor formed by a receptacle upon which a valve having a springy, press-on valve shaft and a non-return valve part is mounted.
2. Description of the Related Art
A known embodiment of a distributor has a receptacle with a valve mounted thereupon. The valve has a springy, press-on valve shaft which is connected to a receiving volume of the receptacle by a passage. The passage may be closed off by a valve part when the valve shaft is in a rest position, but is open when the valve shaft is pressed on. A flexible bag is provided in the receptacle. The inside of the bag is connected to an end of the valve shaft situated in the receptacle. The passage is situated outside the bag.
A distributor of this kind is disclosed in U.S. Pat. No. 3,610,481. This distributor is intended for the simultaneous dispersion of two products through the valve, one product from the bag and one product from the space in the receptacle around the bag.
Therefore, the bag connects to the end of the valve shaft through an intermediary of a second valve part which also is closed off when the valve shaft is in a rest position and is open when the valve shaft is pressed on.
The bag is collapsible under the influence of the pressure surrounding it in the container. This pressure decreases when product from the container is dispensed.
Such a distributor cannot be used for dispensing a single product by a pressure medium. It is clear that, as both vale parts are open when the valve shaft is pressed on, the bag cannot be used for containing a pressure medium which would escape very quickly when product is dispensed.
Known distributors for dispensing a single product, for example spray cans, do not comprise a bag inside the receptacle. A propellant under pressure is put in the receptacle via the valve shaft and the open valve part after the receptacle has been filled with a product.
Thus the propellant comes into contact with the product, which is undesirable in a number of cases.
The invention aims to remedy this disadvantage and to provide a distributor wherein the propellant under pressure and the product are separated and which has a relatively simple construction.


SUMMARY OF THE INVENTION

This aim is reached according to the invention as the bag is a pressure bag which defines an interior space for receiving a pressure medium and the valve includes a non-return valve part by which the valve shaft is connected to the interior space of the pressure bag. The non-return valve part allows flow only towards the pressure bag.
When the distributor is filled, the closable passage connects to the product provided in the receptacle.
The pressure bag makes sure that the product in the receptacle is put under pressure. Therefore, the product may be distributed in the usual manner by pressing on the valve shaft.
As the product is situated around the pressure bag, it is possible to first put the product in the receptacle and to only then provide the valve with the pressure bag and to put the receptacle under pressure by filling the pressure bag. Thus, the product does not necessarily need to be inserted through the valve.
This makes the distributor particularly suited for viscous products, subsequent foaming and curing products, curing products such as polyurethane foams, sealing compounds and food.
Such products may cause problems if they are inserted through the valve. The valve may be obstructed as the product cures or may be soiled by the product. Food may contaminate the valve with bacteria.
As charging times are too lengthy and evacuation is too slow, due to the restricted inflow and outflow of conventional valves for highly viscous products, including among others polyurethane foams, sealing compounds and food, these valves cannot be used for such products in practice.
The invention avoids these disadvantages.
Moreover, a gas which is environmentally sound and safe, i.

REFERENCES:
patent: 3235137 (1966-02-01), Bonduris
patent: 3245435 (1966-04-01), Healy
patent: 3610481 (1971-10-01), Marraffino

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