DE3125034A1 - Valve, in particular for vacuum systems - Google Patents

Abstract

The valve, which is intended for vacuum systems, in particular for high vacuum systems, has a valve spindle (8) which bears a closing element. This closing element consists of two discs (10 and 18) which can be displaced axially relative to one another and are obliquely or conically chamfered at their mutually facing ends to form a V-shaped groove (21). A sealing ring (22) of permanently elastic rubber-like material lies in this groove. As a valve housing use can be made here of a simple, commercially available, seamless drawn or extruded piece of tube (1). Attached to the side of this piece of tube (1) is a further piece of tube (2) of the same construction. Cut into the inside of the first-mentioned piece of tube (1), below the point of attachment of the piece of tube (2), is a groove (23) into which is inserted a spring ring (24). When the valve closes, one disc (18) strikes against the spring ring (24) and is thereby held fast. The further movement of the valve spindle in the direction of closing presses the disc (10) against the now stationary disc (18). As a result, the width of the V-shaped groove (21) is reduced and the flexible sealing ring (22) is expanded radially and rests sealingly against the inside of the valve housing (1). <IMAGE>

Description

DipUiig. KJ. Hübftöf a96 0 Kempten / Allgäu

Moiartetraß 21 - TdI. 0831/28291

Patent holder: Schertier Siegfried, Ing.

CH-94-69 Haag (Switzerland)

Subject: valve, especially for vacuum

Investments

registered on;

Inventor: Schertier Siegfried, Ing.

CH-9469 Haag (Switzerland)

/ 2153 9 / hh / 34

The invention relates to a valve, in particular for vacuum systems with a housing and one that can be moved ■ Valve spindle with a closure member and a seat as a stop for the closure member in the closed state of the valve.

Such valves have become known in a wide variety of forms and designs. The subject invention lies now the task underlying to create a valve construction with regard to its sealing closure member is extremely simple in structure and in which the actual sealing element can be positioned without any particular effort can be exchanged, so that such a valve is inexpensive to manufacture and easy to maintain. According to the invention this is achieved in that the closure member is at least two displaceable relative to one another in the axial direction of the valve spindle Has disks, of which at least one on the side facing the other disk edge side is conically chamfered to form a V-shaped hat and in this groove there is a radially expandable ring made of permanently elastic, rubber-like material and when it is closed of the valve the one disc rests against the stop serving as an abutment, so that the further axial Moving the valve spindle pushes the two disks together and radially expands the ring, which thereby extends fits tightly against the inside of the housing (1). Constructively, the closure member can be this Make the valve very simple in that one disc is connected to the valve spindle and the one on the Valve spindle facing away from the side carries an axial extension on which the second disc is slidably mounted. For the radial expansion of the ring made of rubber-elastic material, it is expedient that both disks are on the edge

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and are conically beveled on mutually facing sides to form a groove a ″ b receiving the ring. The opening angle of this V-shaped groove is dateL like this placed on the radially expandable ring that when reducing the groove width when closing the valve the ring between the flanks of the V-shaped groove is not squeezed, but displaced outwards and itself thereby sealingly applied to the inner wall of the housing. As a seat for the system or the stop of the closure member a spring washer can be used, as it is commercially available, since this only has the task of to hinder the axial displacement of one disc when the valve is closed within the valve itself but does not have to take on any kind of immediate poetic task. The two open sides of the valve that can be connected to the corresponding pipelines, can have weldable or screw flanges.

However, the construction according to the invention has considerably more advantages: Valves of the type mentioned at the beginning Type is essentially in common that the valve housing, which is preferably made of aluminum, by machining Machining is made from a solid, pressed piece of aluminum. This production is very complex, and both in terms of material and time. The housing would be considerably cheaper, material and time-saving produced in an aluminum die-casting process. For Valves that are not subject to extreme requirements with regard to their tightness are also possible. However, this is not feasible for valves that are used in vacuum systems, especially in high vacuum systems Way, since these cast housings do not have sufficient tightness to meet the extreme requirements, as they are in such vacuum systems, especially high vacuum

systems, must be observed. For this purpose, only materials can be used that are due to the semi-finished products leading manufacturing processes have an extremely high material density, such as extruded Pipes, thanks to the proposal according to the invention, it is now possible to produce inexpensive semi-finished products in the form of To use seamlessly pressed or drawn tubes for the valve housing, the valve in terms of its Use in vacuum systems, especially in high vacuum systems, extremely high requirements in terms of The tightness of its housing is sufficient. This can cost both the materials and the cost of the Manufacturing can be significantly reduced. This has been made possible by the fact that for the stop of the closure member in the housing carrying the valve spindle on the inside a groove is provided into which a spring ring is inserted as a stop for the closure member with his outer hand is. Thanks to the proposal according to the invention, it is therefore no longer necessary to have a valve seat in the valve housing to be provided from the outset in the conventional and actual sense.

An embodiment of the invention is explained in more detail with reference to the drawing. Show itί

1 shows a longitudinal section through the opened valve; 2 shows a longitudinal section through the closed valve.

The valve has a first pipe section 1 as a housing, that is seamlessly pressed or drawn, as is commercially available as a semi-finished product. This earpiece 1 is on its lower end is drilled into the side and the edge 2 of this hole is flared. Here is another one Fiohrstück 5 welded on with a mounting flange

■ Ϊ-

4. The first pipe section 1 also has a fastening flange 5 · With these splatters, the valve is inserted into a pipeline. The upper end of the pipe section 1 carries a welded passage 6 with an inner extension 6 ¹ . This passage 6 ″ has an axial threaded bore into which a threaded sleeve 7 with an external thread 7 ^{1 is} screwed. This sleeve 7 is penetrated by the threaded spindle 8. At its upper end protruding from the threaded sleeve 7, a small spring ring 9 is arranged. At its other end, the threaded spindle 8 carries a circular disc 10, the diameter of which is smaller than the inner diameter of the pipe section 1 and which forms part of the closure member, which will be discussed in detail below with regard to its structure and mode of operation.

Between the above-mentioned circular disk 10 and the axially adjustable threaded sleeve 7 there is a ü'ülirungshülse 11, wherein between the upper face of this sleeve 11 and the lower end of the threaded sleeve 7 an axial roller bearing 12 is inserted. A metallic Ifederbalg 13 covers the last-mentioned parts and this is attached on the one hand to the disk 10, on the other hand to the inner extension 6 ^{1 of} the bushing 6.

The upper end of the threaded sleeve 7 or the spindle 8 protrudes into a central bore 14 of a manually operated Handle knob 15- With the threaded spindle 7 is a non-positive connection through the screwed into a threaded hole 16 of the knob 15 and on the Threaded sleeve 7 directly acting grub screw 17 achieved.

The closing element of the valve consists of the already mentioned disk 10, which is attached to the lower end of the spindle 8 and a second disk 18, which is on a in Fig. 1 downwardly directed cylindrical extension 19 of the disc 10 is mounted so as to be axially displaceable. the axial displaceability of this second disk 18 on the cylindrical extension 19 of the disk 10 is through a spring ring 20 is limited. These two disks 10 and 18 are on the mutually facing sides and on the edge bevelled conically to form a V-shaped groove 21 or beveled. A rubber-like, permanently elastic sealing ring 22 is located in this V-shaped groove The opening angle of this V-shaped groove 21 is dimensioned so that when reducing the distance between the groove flanks when closing the valve, the ring 22 through this Flanks is not squeezed, but pressed outwards.

Somewhat below the laterally welded pipe section 3, there is a groove 23 on the inside of the pipe section 1 pricked, in which an open spring washer 24- inserted is, which serves as a stop for the closure member.

So much for the structural design of the valve. If the handle knob 15 is rotated when the valve according to FIG. 1 is open, so the closure member migrates downward via the threaded sleeve 7 and the spindle 8 until the disk 18 rests on the edge of the ring 24. This means that the disk 18 cannot move further in the axial direction in the pipe section 1. If you continue to turn the handle knob 15 will now the second disc 10 pressed against the already fixed disc "18 of the closure member, whereby the Width of the sanders of these disks 10 and 18 be ^ Bounded V-shaped groove 21 is reduced, which has the consequence

that the permanently elastic sealing ring 22 is pressed radially outward and so gradually sealing against the inner wall of the pipe section 1 applies, as shown in FIG. This closes the valve. The displacement s of the logs 18, the opening angle of the V-shaped gutter 21 and the diameter of the sealing ring 22 are coordinated so that this sealing ring 22 is in the closed position of the valve (Fig. 2) is always stressed only in the elastic range, so that unnecessary bruises are avoided which in the Hegel often cannot be excluded with certainty in the case of manually operated valves can. As a result, the sealing ring 22 is always stressed only gently, which has a favorable effect on its service life.

When the valve is opened, the V-shaped groove 21 which is stressed in the elastic range .Ring 22 contracts again and is thereby lifted from the sealing surface of the pipe section 1 and is thus the valve cross-section free when the closure member is returned to its open position (Fig. 1). To the To protect the sealing surfaces, it is useful that the outer diameter of the directly connected to the valve spindle Disk 10 is slightly larger than the diameter of that disk 18, which is when the valve is closed at the stop. As a result, this disk 10 can have a kind of Exercise leadership.

Thanks to the closure construction described above, it is possible to use commercially available and thus to use cheap seamless drawn or pressed tubes that only need to be processed to a small extent,

what about the. previously known measures quite a represents extraordinary discount. The appropriate design of the closure member also ensures a predictable stress on the ring 22 in its permanently elastic area, so that even with a long service life of this sealing element can be expected can. It goes without saying that the closure member according to the invention can also be used in such housings which have been shaped in a conventional manner by cutting, because the one by the redesign of the closure member achievable advantage (easy replacement of the sealing ring from below, without dismantling the drive part) is also possible in such a case, that is, regardless of the design of the housing. Instead of the manual drive, as shown in the embodiment of FIGS. 1 and 2, another mechanical or motorized valve drive can be used.

Figs. 1 and 2 show an angle valve. By using bent or curved pipe sockets (3-26) can also have straight-way valves built in this way will. The seamlessly pressed or drawn tubes can be made of aluminum or steel.

In the embodiment shown, a spring ring 24, which is inserted in an inner groove 25 of the housing, serves as a stop for the disk 18 of the valve disk. It is within the scope of the invention to brace a ring as an abutment in the inner wall of the housing, so that the housing itself does not have to be machined, the mentioned braced ring being held against axial misalignment by radially acting forces. Another possibility for forming a stop provides that a pipe section is inserted from below ξ2) , the outer diameter of which corresponds approximately to the inner diameter of the housing and its

The face then acts as a stop. This piece of pipe can then be applied to the fastening flange 5 in a suitable manner be supported in the axial direction. Instead of a ring or a piece of pipe can also be used as a stop individual abutment elements be arranged in the housing, which bewiken when closing the valve that the disc is only supported in places along its circumference.

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Claims (1)

Patent claims: Valve, especially for vacuum systems with a housing and a valve spindle displaceable therein with a closure member and a seat as a stop for the closure member in the closed state of the valve, characterized in that the closure member is at least has two disks (10, 18) which can be displaced relative to one another in the axial direction of the valve spindle (8), of which at least one on the side facing the other disk is conical on the edge to form a V-shaped groove (21) is chamfered and in this groove (21) a radially expandable Hing (22) made of permanently elastic, rubber-like material and when the valve is closed, the one disc (18) is in contact the stop serving as an abutment applies, so that when the valve spindle is further axially displaced (8) the two discs (10, 18) are pushed together and the Hing (22) radially yours, which is thereby fits tightly against the inside of the housing (1). 2. Valve according to claim 1, characterized in that the one disc (10) is connected to the valve spindle (8) and on the side facing away from the valve spindle (8) carries an axial extension (19) which the second disc (18) is slidably mounted. 5. Valve according to claim 2, characterized in that to limit the axial displacement of the Washer (18) opposite the washer (10) is the local sentence (19) at the end has a groove with a spring ring (20). 4. Valve according to claim 1, characterized in that in which the valve spindle (8) carrying the housing (1) is provided on the inside a groove (23) in which with its outer edge a spring ring (24) is inserted as a stop for the closure member. 5. Valve according to claim 1 or claim 2, characterized in that that both disks (10, 18) are conical on the edges on mutually facing sides to form a groove (21) receiving the ring (22) are chamfered. 6. Valve according to one of claims 1 to 5, characterized in that that the housing consists of at least one seamlessly drawn or pressed piece of pipe, which has a passage (6) on one side for the valve spindle (8) arranged coaxially with the pipe section and which laterally carries another pipe section (2). 7. Valve according to claim 6, characterized in that the implementation (6) for the valve spindle (8) on Pipe section (1) is welded on. 8. Valve according to claim 1 or claim 7 _5, characterized in that the bushing (6) has an inner axial extension (6 ¹ ) and between this extension (6 ¹ ) and the disc (10) of the closure member adjacent to this extension, a metallic, the spindle (8) enclosing spring collar (13) or a stuffing box is arranged. 9. Valve according to one of claims 1 to 8, characterized in that indicates that the pipe section welded to the side (2) is close to the spring ring (24) inserted into an inner groove (23) of the first pipe section (1). 10. Valve according to one of claims 1 to 6, characterized in that the axial displacement path (s) of the discs (10, 18), the opening angle of the V-shaped Groove (21) and the diameter of the sealing ring (22) are coordinated in such a way that when the valve (Pig · 2) is completely closed, the sealing ring is exclusively is claimed in the area of its permanently elastic deformability. 11. Valve according to one of claims 1 to 10, characterized in that the outer diameter of the Valve spindle (8) directly connected disc (10) is slightly larger than the diameter of that disc (18), which rests against the stop when the valve is closed. Pur Schertier Siegfried, Ing .: the representative: 810609