Dispensing – With discharge assistant – Fluid pressure
Patent
1996-01-03
1998-02-03
Shaver, Kevin P.
Dispensing
With discharge assistant
Fluid pressure
222397, 222542, 137212, B65D 8300
Patent
active
057134960
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a sealing for a container device of the type serving the purpose of distributing a liquid, e.g. draught beer, and comprising a container, which under pressure of a gas, e.g. CO.sub.2, stores the liquid, and also a combined gas- and liquid valve being mounted in a neck ring which is fixed on the container and sealed in relation to this by means of a sealing ring which is placed between opposite ring faces on the valve and on the neck ring, respectively.
BACKGROUND OF THE INVENTION
Such a container device is normally cleaned, filled and discharged with the valve mounted. On the consumption place a coupling head is fixed to the valve which through activation of the coupling head opens for passages between the inner part of the container and a gas source and a drawing off place, respectively for e.g. serving of draught beer.
After use, when the container is empty, the coupling head is dismounted whereafter the gas- and liquid passages of the valve automatically are closed. In a container device, which usually is emptied for liquids, there will normally therefore remain a certain overpressure.
This overpressure may be of danger to an operator who is going to dismount a valve when replacing this latter, or when inspecting the inside of the container. If the valve is dismounted while it is loaded by the overpressure, there might be a risk that it, without specific security precautions, is shot out into the room with great force when it loosens the catching with the neck ring. If it hits the operator in this process he might be seriously injured.
In order to avoid accidents of this kind, the valve constructions therefore to-day are often supplied with security arrangement meant to provide for the fact that the overpressure is relieved before the valve's engagement with the neck ring is released.
However, it has shown that the normally square sealing ring between the valve and the neck ring in conventional sealing constructions is liable to be deformed by the gas pressure in such a way that some of the sealing ring penetrates into the slot space which is formed between the valve and the neck ring for passage of the gas during dismounting of the valve.
Thereby the slot space is being closed so that the gas will not be able to escape this way, as intended, and in spite of said security precautions the unsuspecting operator, who relies on the liability of the security arrangement, might nevertheless risk to be hit by a valve which, when being dismounted, is shot out into the room by the overpressure not being relieved after all.
It is therefore required to provide a sealing ring of the type mentioned in the opening paragraph where the sealing ring will not be deformed in such a way that some of the ring can penetrate into and close the slot space which exists between the valve and the neck ring for relieving the gas pressure during dismounting of the valve.
SUMMARY OF THE INVENTION
The novel and unique features according to the invention, whereby this is achieved, is the fact that the valve has a ring-formed projection which protrudes from the periphery of the ring face of the valve with direction towards the ring face of the neck ring. This projection blocks the radial deformation of the ring face and prevents the overpressure in the container from pressing some of the ring into the slot space between the valve and the neck ring. Thereby the gas is always secured a free passage through the slot space when the valve is being dismounted, and the valve is therefore guaranteed to be free from pressure lead when the engagement of the valve with the neck ring is released.
Normally, the opposite ring faces of the valve and the neck ring, respectively, are planar and parallel. In these cases it will be an advantage if the projection has a length which is adequate lesser than the thickness of the mounted and possibly squeezed sealing ring. The length must, however, be large enough to be able to control the radial deformation of the ring to such an extent, that nothing of
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patent: 4451853 (1984-05-01), Dessenoix et al.
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Micro Matic A/S
Shaver Kevin P.
LandOfFree
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