Arrangement for a valve intended for the discharge of a high-viscosity medium.

The present invention relates to an arrangement for a valve intended for the discharge of a high—viscosity medium, which valve comprises a regulator arrangement for a valve body capable of connection to an outlet.

Previously disclosed solutions for the discharge of a high—viscosity medium via a valve are already familiar from, for example, US A 4,030,640, 4,156,495 and 4,474,307. Said solutions function by means of a compressible discharge hose, with the help of the pressure inside a container or with the help of a hand pump.

The principal object of the present invention is, first and foremost, to make available an arrangement of the kind indicated above, which by simple means effectively and reliably solves the problem of achieving distinct interruptions.

An arrangement 1 for a valve 2, which is intended effectively and reliably to permit the discharge of a high— —viscosity medium 3, such as adhesive, plastic, rubber, grease and foodstuffs of a desired kind, etc., and which comprises a regulator arrangement 4 for regulating a valve body 5, which is so arranged as to be capable of closing an outlet 6, contains a supply passageway 7 for the fluid 8. Said fluid supply passageway 7 leads to the outlet 6 separately from a receiving space 9 intended to receive a high—viscosity medium .3 and discharges preferably into the valve body 5. In the example illustrated here the passageway 7 extends internally within an actuator rod 10 attached to the valve body 5 and discharges into a fluid receiving space 11 at one end 10A, and at its other end 10B into the part 5A of the valve body 5 facing towards the outlet 6. Said fluid receiving space 11 is intended to contain pressurized air, gas, liquid or some other fluid 8.

The actuator rod 10, which at one end 10A can be attached to a perforated 12 piston 13 forming part of the regulator device 4, which piston is capable of being accommodated in a cylindrical cavity 14 formed inside a cylinder 14A, into

which cavity fluid 8 is able to flow from the space 11, is so arranged as to be capable of actuation by two springs 15, 16 which are independent of one another. Said springs 15, 16, which can be in the form of spiral compression springs which can be slid over the rod 10, are appropriately adapted one to the other in such a way that one spring acts upon the rod 10 with a greater force. Preferably the spring 15 is so arranged as to act with the greater force F and to cause the valve body 5 to be brought into contact with an enclosing sealing part 17 extending around the outlet 6, when the regulator device function 4 of the valve is not engaged, so that the valve 2 is is thus maintained shut in a closed position I, in which the high— iscosity medium 3 is prevented from being discharged. A force other than the force produced by a spring can, of course, be considered for said purpose. Said stronger spring 15 is so arranged as to act between the valve body 5 and a fixed stop 18, whereas the weaker spring 16 is so arranged as to act between a fixed stop 19 and a moving stop 20 relative to the actuator rod 10, for example a ring 20, which is slid onto the rod 10 in such a way as to come into contact against a seal 21, which is so arranged as to seal between a space 22 situated around the actuator rod 10 and the spring 16 and the fluid receiving space 11, and which is preferably in the form of a sleeve 21A which carries an '0'—ring 21B in a recess 23 in a barrier 24 between said two spaces 11, 22. . The piston 13, which is a .part of and is caused by he regulator device 4 to be displaced in the direction of the arrow 25, and thus with the help of said actuator rod 10 to move the valve body 5 towards an opening position II for the outlet 6 remote from said outlet 6, may be capable of actuation by the effect of a magnet, for example a magnet coil 26 acting with an electromagnetic effect and situated around the piston 13.

The passageway 7 may be capable of being closed at its inlet 7A and of preventing the continuing supply of fluid into the outlet 6 upon actuation of said regulator device 4, for example by the arrangement of a compressible sealing body 27, preferably in the form of an *0'—ring, which is accommodated in a sealing seat 28 on the outer end 13A of the piston.

Between the outer boundary surface 13A of the piston and the inner boundary surface 14B of the cylinder is a clearance 29, in which the fluid 8 is able to flow freely from the space 11 towards the cavity 14. A number of valves 2 are appropriately supported by a common housing 30, in which the receiving spaces 11 and 9 for the high—viscosity medium 8 and the pressurized fluid 3 are situated, which spaces 11, 9 can be common to a number of valves 2, although these are still capable of individual actuation. Said valve 2 can, as shown in Fig. 3, be movable relative to a subjacent surface 31, onto which it is wished to discharge the high—viscosity medium 3 in question.

By means of said valve arrangement 1 it is now possible to produce distinct interruptions in said medium 3 which it is wished to discharge from the valve 2, due to the formation of a fluid—containing accumulation in the medium 3 in question which it is wished to discharge, for example an air bubble.

The function of the valve arrangement 1 should have been appreciated on the basis of the foregoing and from the Figures, although the function can be summarized briefly to the effect that, for example, pressurized air 8 is able to flow freely through the passageway 7 in the position I in which the outlet 6 from the valve is closed by the valve body 5, which is caused by the spring 15 to adopt said closed position I, and that the passageway 7 is closed after actuation of the regulator device 4. The piston 13 is displaced for this purpose into its end position, where it comes up against a countei—pressure part 32 after actuation of the magnet 26, so that the seal 27 seals and effectively prevents the further introduction of air, etc., 8 into the passageway 7. Air, etc., 8, which is exhausted through the outlet 7B from the passageway, will form a number of bubbles in the high—viscosity medium 3 which it is wished to discharge via the outlet 6, through said medium 3 similarly being pressurized or affected by a different pressure, so that the possibility is afforded of achieving distinct delivery of a desired quantity of a high—viscosity medium 3 with distinct interruptions 3A at the

outlet 6. The last thing to leave the outlet 6 before it is closed in order to interrupt the medium 3 is, in actual fact, said air bubble, etc. This offers advantages by comparison with the prior art, by which Long threads can be formed at the end of the 5 intended interruption of a discharge medium, which, for example, presents difficulties when laying out strings of adhesive, etc., on a subjacent surface. The relase of the magnet 26 causes the valve body 5 to be displaced from its open position II to its closed position I. 10 The invention is not, however, restricted to the illustrative embodiment described avove and shown in the drawings, but may be modified within the scope of the Patent Claims without departing from the idea of invention.

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