The invention relates to a faucet for tapping a liquid and of the kind which comprises partly a tubular casing defining, when on normal position for use, a vertically extending axis and at the side having a tubular liquid inlet and also a spout mounted under this inlet, partly a movable valve mounted in the casing, which valve by means of, for example, a handle can both be raised to an upper position where the faucet is open and lowered to a lower position where the valve lies against a valve seat in the casing and closes the faucet.

Tapping faucets are typically used for popular beverages as beer, which in public houses are stored under pressure of C0 ₂ in a container which through a tube and/or a pipe is connected to the liquid inlet of the tapping faucet. The beer is easily putrefied in atmospheric air, since the bacteria cultures liv¬ ing in the beer is depending on the air's contents of oxygen. Beer is a foodstuff which for hygienic and health reasons must not be served in a condition where it is more or less infected and putrefied, and the tapping faucet and it's connecting pipe to the beer container must therefore often be washed out and cleaned with chemicals suitable for this purpose.

In a generally distributed type of faucet the faucet is opened and closed by means of a rotable plug. When the faucet is closed the plug blocks the beer stream while there on parts of the plug's surface and on the other surfaces of the interior of the spout are deposited beer residues which are exposed to the influence of the air and therefore will begin to putrefy when the faucet for some while has been out of function.

Another conventional type of faucet has a valve which can move axially up and down in the casing of the faucet and close against a valve seat being mounted somewhat upwards in the spout. In this case, too, beer residues will be deposited on

the valve and in the interior of the spout when the faucet is closed, and with the same disadvantageous result for the food¬ stuff hygiene as was the case with the plug faucet.

There is thus a need for a tapping faucet of the type men¬ tioned in the opening paragraph being able to eliminate the conventionel tapping faucets' above mentioned problem to the effect that air can penetrate into a faucet and start a putre¬ factive process in the liquid residues which remain on the inner surfaces in the faucet when this latter is in closed position after having been in use for dispension of a liquid.

The novel and characteristic features according to the inven¬ tion, in which this is obtained, is that the valve seat is mounted in close proximity to the opening of the spout. When the faucet is open the beer stream itself will keep out the air. when in closed position the beer will remain in the spout, but now without being exposed to the influence of the air, and the beer inside the faucet will therefore not be able to putrefy.

By a special advantageous embodiment the valve seat extends all the way down to the underside of the spout, while the valve has an end part with a complementary shape corresponding to the valve seat. When the valve furthermore has a plane un¬ derside being on the same level as the underside of the spout and in the borderland between this and the seat is filling this out completely, there can only be beer residues deposited on the faucet's outside which easily can be cleaned manually.

Efficient tightness between valve and valve seat is obtained by constructing the end part of the valve in an adequately hard plastic, e.g. teflon which is resistant to beer and other beverages .

It is important that the beer can stream through the spout without sudden changes in speed, otherwise the beer might foam unintendedly. The lower part of the valve rod can therefore advantageously be constructed as a drop-shaped stream body providing the speed of the stream to gradually be the speed with which the beer is to be dispensed.

At the top the valve extends through the casing to a connec¬ tion with a handle for operating the valve. In order to avoid that air along this way penetrates into the valve, the casing is at the top sealed with a screw cap and the valve is led through this cap via a center opening with a sealing ring.

Below the cap there can furthermore be a chamber with a pre- tightened spring for the purpose, when in closed position, to keep the valve tightly against the valve seat, and in that case the chamber can then be held tightly closed against the underlying liquid filled part of the casing by means of a sealing disc which has a center opening with a sealing ring through which the valve rod is to be led.

The invention will be explained more fully by the following description of embodiments, which just serve as examples, with reference to the drawing, in which

Fig. 1 shows a cross section of an elevation of a first em¬ bodiment of a faucet according to the invention in closed position,

Fig. 2 shows the same, but in open position,

Fig. 3 shows a cross section of an elevation of a second em¬ bodiment of a faucet according to the invention in closed po ^¬ sition, and

Fig. 4 shows the same, but in open position:

In fig. 1 and 2 a first embodiment of a faucet according to the invention can be seen. The faucet, which generally is re¬ ferred to with the reference number l, has a tubular valve casing 2 with a downwards turning spout 3 which at the bottom has a valve seat 4.

In the casing there is furthermore mounted a vertically mov¬ able valve 5 which consists of an upper valve rod 6 and a lower stream body 7.

The valve rod 6 extends at the top via a casing 2 nto the open where the rod is connected to a handle (not shown) to slide the valve up and down between the open position as shown in fig. 2 and the closed position as shown in fig. l.

The chamber 8 is situated in the upper part of the casing, which part is constructed as a neck ring 9 with an outside thread 10 in order to, with a seal 13 between, screw on a screw cap 11, which delimits the chamber 8 at the top. At the bottom the chamber 8 is delimited furthermore by a sealing disc 12, resting against an inside breast 14 in the casing. The sealing disc 12 is pressed tightly down against the breast when the screw cap 11 is fixed, and the force of pressure gen- erated by this operation is transmitted to the sealing disc via a distance ring 15.

The screw cap 11 has en opening 16 with an 0-ring 17, and the sealing ring 12 has an opening 18 with a second 0-ring 19. The valve rod 6 is due to the existence of the 0-rings 17 and 19 led through the openings 16 and 18 in the sealing disc 12 and the screw cap 11, respectively, and the chamber 8 will there¬ fore always be tight closed against as well the outer milieu as the closed part of the casing which, when in use, always will be filled with a liquid.

In the chamber 8 there is a pre-tightened pressure spring 20 which at the top leans against the screw cap 11 and the bottom against a ring disc 21, which is fixed to the valve rod 6 by means of an open spring ring 22. The elastic force of the pressure spring will consequently press the valve 5 down tightly against the valve seat 4 in the closing position of the faucet.

At the side between the spout 3 and the neck ring 9 the casing 2 has a tubular liquid inlet 23 with a screw branch 24 meant for, via a tube or a pipe (not shown) , connecting the faucet with a container (not shown) in which a beverage is stored under pressure, which beverage in the following, for example, is supposed to be beer.

The valve seat 4 has a double-curved surface expedient for the streaming through the spout, which surface is extending all the way down to the underside 25 of the spout. As shown, the lower stream body 7 of the valve has furthermore at the bottom a complementary surface in relation to the surface of the valve seat which latter surface fits tightly to the valve seat when the faucet is in the closing position as shown in fig. 1.

The stream body 7 has furthermore a plane underside 26 being at the same level as the underside of the spout 25 in the closing position of the faucet, whereby the underside of the spout and the free underside of the valve 26 will form a smooth and unbroken surface which is easy to clean.

When a glass of beer is to be dispensed the valve will be raised by operating the handle, not shown, up to the position as shown in fig. 4 where the faucet is open.

The C0 ₂ overpressure standing in the beer container and which normally is reduced to a conveniently lower overpressure by

means of a not shown reduction valve, which has been switched in after the beer container, will now press the beer via the not shown tube- or pipe connection up to the tubular liquid inlet 23.

The beer will then stream via the liquid inlet into the spout 3 and continue down through this and finally passing the open space between the valve seat 4 and the stream body 7 and leave the faucet 7 in a jet at the opening of the spout.

As long as the beer streams through the faucet in this way there will be no risk for air being able to penetrate the op¬ posite way into the faucet. This risk will not occur until the faucet is closed and the beer stream is stopped, since atmos- pheric air not only can, but normally will penetrate into some part of conventional faucets' interior where the contents of oxygen in the air will be able to start a putrefactive process in the beer residues which necessarily will remain on spots which not immediately can be inspected and furthermore must be regarded as almost inaccessible for normal manual cleaning.

This significant disadvantages by the conventional faucets are efficiently remedied by means of the faucet according to the invention where the faucet is closed directly at the opening of the faucet and the atmospheric air is prevented from pene¬ trating into the interior of the faucet.

After a tapping there can, of course, very well remain beer residues on the spout's outside which can, however, easily be surveyed and cleaned manually. This also applies for the critical area at the opening of the spout where the underside of the spout and the free underside of the valve, however, now form an area so smooth and unbroken as the rest of the surface of the spout .

Even if the faucet according to the invention thus normally provides full protection against putrefaction of beer or beer residues being in the interior of the faucet, the system should nevertheless be washed out and cleaned with chemicals . As a result of the smooth interior of the faucet no chemicals will be able to hide here and thus it is prevented that dis¬ pensed beer unintendedly will be consumed by a person who in this way could be more or less injured.

The previously mentioned lower sealing of the chamber 8 will furthermore secure this from being penetrated by chemicals.

The first embodiment shown in fig. l and 2 has a rather short stream body with an axial length of between 10 and 50% of the length of the spout. The complete stream body consists of a comparatively hard plastic, e.g. teflon, which with a screw connection is screwed on to the smooth valve rod 6. This con¬ struction is especially simple and economic to produce.

The second embodiment of the faucet according to the inven¬ tion, as shown in fig. 3 and 4, is in principle constructed in the same way as in the case of the first embodiment as shown in fig. 1 and 2. The construction and mode of operation of the faucet will consequently not be described in details again, as there in the following only is a description of the specific construction of the stream body and the advantages which are attached to this construction. For equal parts there will in all cases be applied the same reference number as in fig. 1 and 2.

As shown, the stream body 28 of this embodiment has a greater length than is the case with the stream body 7 shown in fig. l and 2, namely a length of between 50 and 100% of the length of the spout .

At the same time the stream body is completely or approxi¬ mately close to be drop-shaped whereby the beer stream is guided calmly through the spout at a speed increasing gradu¬ ally and gently so that the beer will not foam unintendedly.

In order to facilitate the work the stream body in the shown example is only approximately being drop- haped mainly con¬ sisting of a long upper cone 29 and a short lower cone 30.

The valve seat 31 is also constructed as a cone with the same conicity as the stream body 28 's lower cone 30, and when the faucet is closed, as shown in fig. 3, the two cones will therefore fit tightly to each other and efficiently prevent atmospheric air from penetrating into the faucet.

The lower part of the stream body 28 consists of an individual plastic part which by a screw connection 27 is screwed onto the rest of the stream body. The plastic which is used should preferably be rather hard. Teflon is an expedient material for this purpose and at the same time it is resistant to beer.

The description above of the tapping faucet according to the invention is made on the assumption that it is used for beer. This is, of course, only to be understood as an example, and the faucet can just as well be used for many other beverages, as e.g. soda water, cola and wine.

Furthermore the faucet will be suitable for many other liquids which do not have to be drinkable, but nevertheless can pu- trefy under the influence of the air. This applies for certain types of oils.