Valve with safety protrusion

Abstract

The present invention is directed to a valve (1) for a container comprising a grommet (2) having a plug system (10) and defining a channel (3) with an inlet end (4) and an outlet end (5) and a stem (8) slideably arranged in the channel (3), whereby the grommet (2) comprises at least two parts (7) and (8) sealingly engaged, said first part (7) having protrusion within said second part (8).

Description

FIELD OF THE INVENTION[0001]The present invention relates to a new aerosol valve for a pressurized fluid container, more particularly for one component polyurethane foam applications.BACKGROUND OF THE INVENTION[0002]It is known generally known to store fluids under pressure in containers (cans or vessels) in a wide field of applications. The fluids are usually dispensed from the container by means of a valve arranged in a cup of the container.[0003]A well-known application is sprayable foams used in both industrial applications and by hobbyists. As such, containers with sprayable foam can be exposed to rather extreme conditions in terms of temperature and pressure.[0004]Under these extreme conditions, the pressure in the container may rise and the valve may detach from the container creating potential safety issues.[0005]In order to prevent the above, several safety measures are used, such as providing an overpressure relief valve or providing “burst parts” in the container. However...

AI Technical Summary

Benefits of technology

The present invention is a valve designed to prevent detachment from a container during extreme conditions of temperature and pressure. It includes a grommet with a plug system and protrusion, providing safety and resilience. The grommet parts are dual injected, ensuring adhesion and sealing. Overall, the valve design provides additional safety and reliability.

Problems solved by technology

As such, containers with sprayable foam can be exposed to rather extreme conditions in terms of temperature and pressure.

Under these extreme conditions, the pressure in the container may rise and the valve may detach from the container creating potential safety issues.

However, the use of overpressure relief valves is expensive, while providing weakened “burst parts”' in the container is no option for containers that are used on building sites as unintended burst of the container may be triggered by the nature of use of these containers.

However, the overmoulding is a cost inefficient process.

Although the coupling device of the invention comprises a safety lip to assist in withstanding pressure, the inside of the valve is not protected against rising pressure.

Further, although a thermoplastic material has been used to provide hydrophobic properties and avoid diffusion / absorption of ambient moisture in the container through the valve, thermoplastic materials exhibit other inconveniences such as “creep”, which is a well known property of thermoplastic (TP) rubbers.

This creep allows for the materials to deform and causes the grommet to detach from the cup when the container is put under extreme pressure.

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