DE3005329A1 - Double acting valve for fluid process - has coaxial telescopic valve stem with single drive and independent operation - Google Patents

Abstract

The fluid process double acting valve has coaxial valve stems with the relative telescopic action operating the two valves (10,4). A single drive operates the valves, with a piston (16) linked to one valve stem (9) balanced between two springs. The other valve stem is linked to a second piston (18) which braces the bottom of the second spring. The valves are mounted in a single compact housing. They provide a flow and flushing control in food processing without danger of leakages during the process. The springs hold the valve elements in the closed position, with the space between the valves vented via a hollow shaft.

Description

QLOSER --- "-.""..".: .. "-8O? 6" Ebenhausen-Werk ü. Ingolstadt / D.

PATENT ADVOCATE

Patent attorney 0. Glßaer, Sudetonetr. 6, 8076 Ebenhausen-Werk G. Inoolatadt / D. Ebenhausen, 12 2 19 80

My reference: 140/80/14 Gl / S Your sign:

Applicant: Leonhard Schleicher, Südmo-Armaturenfabrik GmbH, 7081 Riesbürg-Pflaumloch

Shut-off valve with leak protection

The invention relates to a shut-off valve with leakage protection for the food and beverage industry, the two cooperating with a common valve seat in its housing Has valve plate, which via valve stems nested in a telescopic manner from the outside individually or together are controllable and, together with the valve seat, limit a leakage cavity, which is via corresponding lines flows down into the open.

It is known that such shut-off valves are used when two mutually hostile liquids, e.g. lye and Milk, should certainly be separated from each other. In addition, there is a requirement that everyone with the respective Parts that come into contact with liquids, i.e. both valve disks and the leakage cavity, without great effort, i.e. only

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Bank details: Bayerlache Hypotheken- und Wechaelbank, Ingoletadt branch, account no. 6 480 225 021

to be cleaned by rinsing with lye and / or disinfectant. The cleaning of the leakage cavity must also be possible, if When the valve is closed, the upper or lower valve housing is exposed to or filled with product, e.g. milk. In addition, the aim is that the control of the valve plate results in only a low construction cost and if possible the underside of the valve remains free so that the lines can be laid close to the floor.

To solve this problem or to meet these requirements, it is proposed according to the invention that for controlling Both valve plates a single drive is provided on the valve top, the cylinder chambers separated from one another by pistons has, which are separately controllable in such a way that both valve plates together in their fully open position or individually and get into partially open positions independently of each other. In other words, it means that the only one under the The valve does not take up any space and has a quadruple function fulfilled, i.e. a maximum of economy with the highest space saving. Because of this particular drive is it is actually possible not only to open and close the valve, but to control the two plates so that each a seat can be flushed and cleaned.

According to a further special feature of the invention, it is provided

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that in the cylinder of the valve stem of the lower valve disk carries a piston loaded on both sides by springs, wherein the upper spring is firmly supported against it, while the lower spring on a disc of the hollow valve stem of the plate you will find an abutment and in the space under the piston Pressure line opens. This makes it possible in a simple manner to move the valve disk from its closed position into the fully open position bring to.

To the. partial control of the upper valve disk for the purpose its cleaning and the cleaning of the valve seat, it is considered expedient according to the invention that in the lower A further piston is located in the area of the cylinder just below the abutment disk, which piston is arranged in the direction of the cylinder, for example by arranging an outside of the cylinder Stop nut, limited mobility is guided on the hollow valve stem and the space under the piston below the controllable influence of a printing medium.

If you want to clean the lower valve disk with its seat, we recommend a design that consists of the upper area of the cylinder a third piston is provided axially movable limited on the valve stem, below which a pressure medium opens and a neck extension of the piston with a stop that extends upwards out of the cylinder cover a collar screw cooperates. It is useful

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moderate, that to limit the stroke of the third piston in the cylinder cover special adjustment screws are provided. Here, too, as with the designs described above, simple ones are used Rotary bodies are used, which leads to the already mentioned high economic efficiency with the highest functional reliability contribute.

It should also be mentioned that the partial lifting of a valve disk known for a long time by a design of the applicant is and this knowledge has now been applied in a meaningful way to a shut-off valve with two valve disks to be able to flush both valve seats or both plates and the leakage cavity without the normal functions of the valve disturb.

In the drawing, the invention is illustrated by way of example; show it:

1 shows a section through the valve according to the invention when closed;

2 shows the same valve in its fully open position;

3 shows a section through the valve according to FIG. 1, with the upper valve disk in a partially open position is located and

4 shows the valve according to FIG. 3, but with the lower valve disk partially raised.

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According to Fig. 1, the valve consists of a valve housing 1 with a line connection 2 and 3. The liquid-dxchte closure of the liquid entering at connection 2 takes place through the lower valve disk 4. If the liquid flows through the lower If the valve disk seat 5 leaks through, it is removed from the leakage space 6 via the bores 7 through the one attached to the lower valve disk 4 Leakage drain pipe 8 discharged into the open. The lower valve disk 4 is firmly connected to the piston rod 9. Of the The upper valve disk 10 is mounted with the sleeve or the hollow valve stem 11 on the piston rod or on the valve stem 9 in an axially sliding manner.

If liquid leaks from the line connection 2 through the upper valve seat 12, this is also out of the leakage space 6 discharged into the open via the bores 7 and the leakage pipe 8. Mixing the liquids from port 2 with the liquid from port 3 is prevented with certainty.

An intermediate lantern 13 with the viewing openings is attached to the housing 1 14 a cylinder 15 is connected. The pneumatic piston 16 is fixedly attached to the axially movable valve stem 9. The pretensioned compression spring 17 presses the lower valve disk 4 against the valve seat in a liquid-tight manner via the valve stem 9 5 at. A cylindrical disk 18 is fixedly attached to the valve stem 11. The pretensioned compression spring 19 is supported

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with one end to the pneumatic piston 16 and with the other End at. the disc 18 from. The force of the spring 19 presses the upper valve disk 10 via the disk 18 and the shaft 11 liquid-tight to the valve seat 12.

FIG. 2 shows the shut-off valve according to FIG. 1 in the open state. To open the valve, the cylinder space 2o is over the air connection 21 biased with compressed air. As a result, the pneumatic piston 16 moves with the valve stem 9 upwards. At the start of the stroke, the lower valve disk 4 rests with its seat surface 22 on the upper valve disk 10 in a liquid-tight manner at. As a result, the leakage space 6 is closed when the valve is open. With the further stroke, both valve disks 4 and 10 brought into the open position shown.

Fig. 3 shows the cleaning position of the upper valve disk For this purpose, the cylinder chamber 2 3 is connected to the air connection 2M- Compressed air is applied. This causes the pneumatic piston 25 to come to rest against the disk 18. During the further stroke, the disk 18 with the shaft 11 and the upper valve disk 10 raised until the sleeve 2 6, which is slidably mounted on the shaft 11 and attached to the pneumatic piston 2 5, with its height-adjustable sleeve Nut 27 on the collar 28 of the intermediate lantern 13 comes to rest. This allows a partial amount of cleaning fluid from connection 2 through the annular gap 29 into the leakage space 6 and through the holes 7 and the leakage drain

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pipe 8 exit into the open without pressure. Valve head 10, valve seat 12 and leakage space 6 are cleaned without affecting the fluid from port 3.

Fig. 1 shows the cleaning position for the lower valve disk M-. For this purpose, the cylinder space 30 is connected via the air connection 31 pressurized with compressed air. The one on the valve stem 9 Slidably mounted pneumatic piston 32 moves upwards and comes to rest against the stop 33 of the collar screw 34-. at the further movement, the piston rod 9 with the lower valve disk 4 is raised. The lifting height is set by adjusting screws 3 5 limited.

According to the invention, therefore, all valve functions with only one, The drive located at the top of the valve is controlled, whereby the valve drive with the two valve disks can be removed upwards can.

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Claims (5)

Claims 1.) Shut-off valve with leakage protection for the food and beverage industry, which has two valve plates in its housing which cooperate with a common valve seat, which can be controlled individually or jointly from the outside via telescopically nested valve stems and, together with the valve seat, delimit a leakage cavity, which via corresponding Lines open downwards into the open, characterized in that a single drive (cf. , 20, 30), which can be controlled separately in such a way that both valve disks (4, 10) jointly in their fully open position (cf.Fig. 2) or individually (4 or 10) and independently of one another in partially open positions (cf.Fig. 3 and H) . 2. Shut-off valve according to claim 1, characterized in that the valve stem (9) of the lower valve disk (4) in the cylinder (15) carries a piston (16) loaded on both sides by springs (17, 19), the upper spring (17) being firmly supported against it, while the lower spring (19) finds its abutment on a disc (18) of the hollow valve stem (11) of the plate (10) and A pressure line opens into the space (20) under the piston (16) (see 21). 13ÖÖ34 / 0312 BAD ORFOINAL ^{:: -:} - 'J 30Q5329 - & - 3. Shut-off valve according to Claims 1 and 2, characterized in that that a further piston (25) is located in the lower area of the cylinder (15) just below the abutment disk (18), in the cylinder direction, for example by arranging a stop nut arranged outside the cylinder (15) (27), is guided to a limited extent movably on the hollow valve stem (11) and the space (23) under the piston (25) under the controllable influence of a printing medium (see FIG. 24) is available (see FIG. 3). M ·. Shut-off valve according to Claims 1 to 3, characterized in that that in the upper area of the cylinder (15) a third piston (32) is limited axially movable on the valve stem (9) is provided, under which a pressure medium (cf. 31) opens and a neck extension led upward out of the cylinder cover of the piston (32) interacts with a stop (33) of a collar screw (34) (see. Fig. 4). 5. Shut-off valve according to Claims 1 to 4, characterized in that that special adjusting screws (35) are provided to limit the stroke of the third piston (32) in the cylinder cover. 130034/0312