Dispensing – With discharge assistant – Fluid pressure
Patent
1997-10-03
1999-07-27
Kashnikow, Andres
Dispensing
With discharge assistant
Fluid pressure
22240221, 2224021, B65D 8300
Patent
active
059275634
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a valve arrangement having the features of the preamble of claim 1. Such valve arrangements are mounted on a container used to dispense pressurized liquid or foam, especially PU foam, assembly foam or sealing foam, the top of the said container being provided with a valve disk, which has an opening, especially of a circular shape, in which a valve body equipped with a valve stem is fixed. The valve stem is elastically depressible, and thus cooperates with sealing elements in the manner of a valve opening. The sealing elements are provided with sealing faces, especially of a planar or conical shape, which faces are disposed on a sealing member and in a closed position bear on correspondingly shaped sealing faces of the valve body.
Known valve arrangements have elastic sections or elements that ensure depressibility of the valve stem. These elastically constructed sections or elements, which can have a domed shape, for example, tend to exhibit instabilities that may lead to impairment of function during storage and operation. Available valve bodies often lack the necessary elastic characteristics or no longer have such characteristics to begin with or after being used for only a short time. They are either too hard or not sufficiently flexible, or they may be too soft or wear too quickly. This means that the valve arrangement does not return to the specified initial or closed position after the discharge process and no longer achieves adequate sealing. Foam leaks out, and this may lead to contamination and damage under some circumstances.
The object of the invention is to improve and construct a valve arrangement in such a way that it has high functionality in combination with a simple design, ensures a good sealing effect and is easy to manufacture and assemble. This object is achieved by the characterizing features of claim 1. Advantageous further embodiments of the invention are presented in dependent claims 2 to 30.
The central idea of the invention is to construct the valve body as a plastic sandwich structure consisting of an inner hard part and an outer soft part, the inner hard part and the outer soft part being intimately joined together over their common contact surfaces by an injection-molding process to form a perfect bond. The elastic part attached to on the valve body is also made as a two-component structure in this way, thus assuring the required permanent and robust elastic characteristics that are necessary for good leak-tightness of the valve system. The valve body is made by a two-stage injection-molding process. The outer soft part ensures the necessary elastic action in the depressible region, and also ensures the necessary sealing effect in the regions at the sealing member, the valve disk and the connection for the outlet line. The inner hard part is formed substantially as a pipe-shaped member, which as a component of the valve body passes completely or partly therethrough and thus reinforces the valve body in selected regions, including the elastic region.
In the two-stage injection-molding process, the contact surface of the hard material adheres very intimately to the available contact surface of the soft material, and so a body with inseparable sandwich structure is obtained. An advantage of this embodiment is that the outer soft part of the valve body in cooperation with the inner hard part provides an excellent sealing effect after the discharge process and during storage. Additional O-rings and similar components as used in prior-art valve arrangements are not necessary. One and the same soft body is also used f?r other sealing regions, however, specifically in the top end region thereof by providing valve-stem sealing lips as a connection for the outlet lines, to which a discharge device such as a spray gun or similar device can be attached, and as the seal between the valve disk and valve body. By virtue of the multiple sealing function, savings are achieved both in material and assembly costs for manufacture of the complete arrangement.
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REFERENCES:
patent: 4165825 (1979-08-01), Hansen
patent: 4651899 (1987-03-01), Pauls et al.
patent: 4805813 (1989-02-01), Metcoff et al.
patent: 4824075 (1989-04-01), Holzboog
Deal David
Firma AMV Automation Montage Vertrieb
Kashnikow Andres
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