Dispensing – With refill preventing means
Patent
1992-07-30
1994-04-26
Kashnikow, Andres
Dispensing
With refill preventing means
2224021, 141 20, B65D 4702
Patent
active
053059255
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a disposable pressure container, in particular for use as a refill container for refrigerating and air conditioning systems, comprising a combined filling and removing valve which has a filling and removing opening and includes a valve body which is displaceably guided in a bore of a valve housing and urged by a resilient force against a valve seat and which is liftable from the valve seat against the action of the resilient force for filling the pressure container and for removing the pressurized contents of the container, and which includes a second valve body which, before the container is filled for the first time, is held in space-apart relationship with its valve seat by a surmountable and fluid-permeable barrier, a tappet which is actuable from the filling and removing opening and acts on the second valve body being provided for urging the second valve body beyond the flexible barrier, whereby the second valve body forms a check valve with its valve seat after the barrier has been surmounted, the check valve preventing the container from being filled again.
Several applications are known of disposable pressure containers. The most frequent use is probably that of a sprayer for spraying products using a propellant. Pressure containers of this type are also used as gas tanks for small brazing and welding devices. Another important use is the employment thereof as a refill container for automotive air conditioning systems. Before the delivery of automotive vehicles a certain loss of refrigerants can already be observed in the per se closed circuit of the air conditioning system in most cases. This loss is compensated for by refrigerants contained in refill containers, which are fed into the air conditioning system through the filling and removing valve.
Although the law forbids the renewed filling of such disposable containers with refrigerants or propellants, the combined filling and removing valves would permit such a refilling operation. When one bears in mind that the pressure containers are damaged to some degree during their use, the refilling possibility entails a high potential safety risk.
A disposable pressure container of the above-mentioned kind is known from U.S. Pat. No. 3,704,813. This pressure container has already the advantage that it prevents refilling. However, the valve housing is relatively troublesome from a constructional point of view, and its manufacture is thus expensive.
It is therefore the object of the present invention to improve the valve housing in a disposable pressure container of the above-mentioned type in such a way that its production is easy and inexpensive.
This object is attained according to the invention in that the valve housing is made integral with a first bore for receiving the first valve body and a second bore for receiving the second valve body of plastics, that at the end opposite to the first valve seat the first bore comprises a radially inwardly oriented shoulder which is integral with the housing and on which a helical spring urging the first valve body against the first valve seat is supported on the one hand and the barrier for the second valve body is formed on the other hand, the shoulder comprising projections that project radially inwards into the circular plan view of the second bore and are also made integral with the valve housing of plastics
The valve housing can thus be manufactured in a simple way as an injection-moulded part, made e.g. of polyamide, or the like. Hence, a substantial safety advantage can be achieved at very small costs
The projections can be constructed in a very simple way if designed as radially inwardly positioned ends of radial webs that are arranged on the shoulder and evenly distributed over the circumference. These webs lift the second valve body from the shoulder when the container is filled for the first time, so that during the filling operation fluid can flow through passages defined by the webs into the smaller second bore and thus into the container.
In an especially preferred emb
REFERENCES:
patent: 3704813 (1972-12-01), Devol
patent: 4216884 (1980-08-01), Giuffredi
patent: 4543980 (1985-10-01), van der Sanden
patent: 4573611 (1986-03-01), O'Connor
patent: 4921214 (1990-05-01), Jernberg
patent: 5018552 (1991-05-01), Politi et al.
Bomberg Kenneth
Hago-Chemotechnik GmbH & Co. KG
Kashnikow Andres
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