DE7902845U1 - BALL VALVE - Google Patents

Description

Rötelmann P / Co.

5380 Verdohi Our files: r 105-j, DE

Ball valve

The invention relates to a ball valve according to the preamble of claim 1. The seals can in particular be di-hringings.

Such ball valves are used in a wide range of applications Switching and shutting off flowing media, especially liquid and gaseous media, are used. Their advantages are general on the one hand in the short switching path, since one turn of 90 is sufficient to move the ball valve from full blocking to full flow to control and vice versa, on the other hand in the fact that c.as switching of media is also possible under very high pressure, in which other systems, for example with cylinder plugs, due to the high pressure force are hardly switchable, and finally in the fact that the simple design and manufacturability one low price allows.

In the case of ball valves, however, difficulties can also arise especially if the ball valve has to be removed and dismantled.

With the usual construction of ball hoses, it is not easy to remove and dismantle them. In this construction are the seals, the ball and often also the spindle are inserted through one of the mouths. When installed then seals the ball through its media pressure

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te pressure on the outlet-side seal. A possible Dismantling is only possible through the mouth again. For example when used in the food industry as in Breweries or candy factories need the tap frequently, in general be removed and cleaned daily so that perishable residues do not get stuck in dead corners. For a ball valve With weld-in ends, expansion is also not permitted to protect the sealing rings, which are generally made of plastic high temperature when welding the cone valve into a Pipeline required. The welding of the ball valves in the course of the pipelines can for various reasons, be desirable for reasons of space, for example.

Ball valves with a removable middle part are also known. These ball valves have two flange nipples which are connected to one another by means of screw bolts with the removable middle part in between. The middle part consists of a cylindrical ring, in the ring opening of which the ball lies and, in addition, one of the sealing rings is inserted from both open sides, which seal on the one hand the Kuc'elküken and on the other hand against the flange nipple. The middle part is mounted, for example, on one of the bolts in such a way that it can be pivoted out between the flanges after the bolts have been loosened. The flange nipples are mostly welded or welded nipples, but also threaded nipples. However, the known ball valves with a removable middle part still do not meet the requirements of expandability and dismantling in a satisfactory manner. With this construction, which is not possible for multi-way taps, the swiveling out and tight swiveling back in of the middle part often fails due to the fact that, when the installation is complete, the connecting tubes on both sides are mostly not exactly aligned, so that the bolts connecting the flanges are subjected to bending and shear loads and pivoting the middle section in and out causes considerable difficulties and, under certain circumstances, leaks

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activities both between "the connections" as well as out-in results.

Ball valves are also known (DE-AS 1 202 596, DE-OS 2 125 717), in which individual parts are assembled from above, in that ör has an opening there for the passage the ball and the sealing material is sufficient. The sealing material is with the help of a screw insert from above against the Ball pressed. However, this results in considerable problems with regard to the constant pressure and the beginning of flow of the sealing material. Due to the special design of such ball valves, they cannot be used for higher pressures. because the medium pressure does not press the ball onto the sealing ring on the discharge side.

In contrast, the invention is based on the object of the universal To increase the usability of the ball valves, in particular to enable that even when used for high pressures and when If the pipe connections are not exactly aligned, it is possible to remove the ball valve from the pipe system. This task is achieved by the invention characterized in claim 1. The "inner" ball valve, which is located in the valve body and equipped with a ball plug that can be inserted through the mouth, is on differs from the usual design, i.e. with parts that can be pushed in from the front and with a seal due to the media pressure effected pressing of the ball plug against the outlet side Poetry. However, he can - if necessary after solving one Seeger rings - can be completely pulled out of the rigid housing. Since the rigid housing does not depend on the pipe ends needs to be released, between which it is welded, for example, tensions due to the pipes cannot lead to such a warping of the system that dismantling or assembly would no longer be possible. For example, every evening Removal for cleaning is easily feasible.

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The subject matter of claim 2 relates to the application of the invention on the usual ball valve construction. The introduction of the valve body into the valve body is not possible from above or below but also from the side, e.g. B. if the spindle is used later, possible. The cock body is expedient and the cavity of the tap housing is substantially circular-cylindrical or conical, so that the cavity can be a recess can. This design is the simplest in terms of production technology, but the valve body itself can also, for example, be cuboid be. In the case of a rotationally symmetrical body, an angular position lock is generally used, for example in Form sines projection or a recess on the tap housing base, be appropriate.

The conical design can have the advantage that the required Scoring of the seal between the valve body and the valve body can be achieved more easily because with cylindrical Execution of severe scoring on the seal on the surface of the valve body only by comparatively far the. Sealants protruding from the valve body, in particular G-rings, can throw achieved, however, under certain circumstances when inserting the tap body into the cylindrical cavity of the tap housing can be misplaced.

At higher pressures, the known ball valves are generally unsuitable for throttling, since with the passage channel, which is then only partially open, at the throttling edges of the ball and the seals, ins. «But especially on the seals, damage occur. Claim 5 gives inde ~? Ei <= ine MügTichkeit a:., Also a Kugelhahr. -.to use throttles ru, iniem el Due to the only marginal covering of the passage channels of the valve on the one hand and the valve housing on the other hand, reduced passage cross-sections are available, the edges of which, the coined sealing

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tasks have been designed with sufficient strength in terms of material can be. The ball arrangement, which is sensitive to throttling tasks, is still only used for switching. At the claimed Construction, wear and compression of the seal between the mouths of the tap body are avoided .

Claim 6 relates to the sealing of the connections against one another in the gap between the tap body and the tap housing. The sealants can in particular be seals that, for example, surround the individual mouths on the tap housing in a circle or which have a slant, as is known per se, for example for cylinder plugs in the cylinder valve housing (DE-AS 1 252 490, CH-PS 292 316). Elastomer O-rings are particularly suitable for the latter type of installation of the sealants, Furthermore, thermoplastic rectangular rings can be used with advantage, whereby the arrangement of the sealants follows Claim 8 in particular for such less elastic sealing materials otherwise suitable, those between the, for example, cylindrical walls, the tap body and the tap housing it is difficult to achieve sufficient surface pressure

The sealing of the ball valve caused at the media pressure, the ^'stirrup ^ ay from the ~ suppressed lußseitig <= gasket, but it must first be already sufficient bias the seals against the' generated -'ugel. For this purpose, in a conventional V / else into the faucet body is a screw bushing be used, the pressing on ei e of the seals and on these and the ball lands on the other ⁰ of the seals' .. It is jedo: h in e: indungsgenui3en construction ^ uch possible, genv ^; ß Claim 9 a plug-in ": nse to use, d '-or the insertion of the tap body protrudes into the tap housing from the tap body, but is pushed into the tap body by the insertion with elastic compression of the seals.

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Steel can be used as the material for the valve body for high media pressures up to 500 ... 600 bar, for moderate media pressures up to the order of magnitude of 1CO bar the Hahr.körper according to claim 10 be a plastic strand part. The production of the ball valve according to the invention, especially in plastic, is thus possible relatively cheaply.

The design of the ball valve according to the invention is per se also possible for multi-way valves, but here it may be possible Attachment of the seals between the various connections in the gap between the valve body and the valve housing To cause difficulties. From a functional point of view, it is easiest if there is an annular groove around each opening in the valve body runs, in which a corresponding O-ring is inserted.

Further details, advantages and developments emerge from the following description of preferred embodiments ¹ with reference to the drawings. Show it:

1 shows a longitudinal section through a ball valve according to the invention in a plane I-I in Fig. 2;

FIG. 2 shows a cross section through the ball valve according to FIG. 1 in a plane II-II in Fig. 1;

3 is a perspective view of a slightly modified, Valve body that can be inserted into a valve body, with v / eg-cut parts:

FIG. 4 shows a cross section through parts of the tap body according to FIG. 3;

Fig. 5 in an exploded view, partly in section, Parts of a further modified tap body with an associated tap housing;

Fig. 6 is a front view of a tap body with a ring seal.

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ItI «III (11

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The ball valve according to FIGS. 1 and 2 comprises a valve body 1 with an essentially circular-cylindrical outer surface which is inserted tightly into an essentially circular-cylindrical cavity 2 of an outer valve housing 3. The faucet body 1 has a throughflow channel 6 running along a cylinder diameter between mouths 4, 5 lying in its lateral surface on both sides. In the course of the flow channel 6 there is a ball plug 7 which is inserted between two sealing rings 8, 9 so as to be rotatable. While the sealing ring 8 is supported on a shoulder 10 in the bore of the through-flow channel 6, the uichtrinc 3 is slightly pressurized by a screw bushing 11. The ball plug can move between two positions by 90 ° in the usual way with ball valves are twisted forth that in one position the flow channel 6 continues through the free spaces within the sealing rings 8 and 9 and through a hole in the ball plug 7 and in the other position the flow channel 6 is blocked by the free spaces within the Sealing rings 8 and 9 are delimited by closed spherical surface parts. Above the spherical plug 7 engages a spindle 12 via a groove and wedge, which outside of the valve body 1 has a handle

13 or a key to actuate the rotation is connected. The spindle 12 is in the valve body 1 by means of an O-Rir.gs

14 sealed.

The faucet body 1 is angularly fixed in the faucet housing 3 by a pin 15 located on the housing floor, which means that it is: '~ recess 16, complementary to it, in the cock body 1 engaging. A circlip 17 detachably holds the cock body 1 in the cock housing 3.

In the example shown according to ig. 1, 2, there are mutual Connections of the valve body 3 from cast and threatened Screw nipples 18, 19. However, a construction with any desired connections is possible, including with Weld-in or weld-on ends (Fig. 5), with external threads for union nuts, with flanges or even with simple openings. Often there are only flow openings 20, 21 in the valve body, which coincide with the mouths 4, 5 of the cock body 1.

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The cock body 1 'ann after removal of the Seeger ring 17 completely mounted to be removed from the tap housing 3, for example for the purpose of cleaning, exchange for maintenance or repair or for the purpose of protection it is not heat-resistant components, ν "in work on the pipe system under high temperature nuts. That about d '·. Screw nipples 18, 19 fix the tap housing incorporated into the pipe system 3 retains its place and shape, even if. ^ E subsequent Röhrt Exercise moderate forces on the inserted ball valve.

According to FIGS. 1, 2, the voltage on the sealing rings 8, 9 is applied by the screw socket 11, be '. i \ faucet body 1 of FIG. 3, however, is for this Zw ⁵ Ck pure. "eckbuchse 1 '', which in the non-inserted into the tap housing 3 Condition for example, 1 mm from the relevant opening 4 or 5 ^ e ^ cock body protrudes, by pushing it into the cylindrical cavity 2 of the cock housing 3 so i .. the cock body 1 is pushed in and pressed over the sealing ring 8 and over this and the ball plug onto the sealing ring 9 so that they have the required preload due to their resulting change in shape.

On the outer surface of the tap body 1 are located between the mouth 4 and the mouth 5 or between the flow opening 20 and the flow opening 21 seals. In the executions According to FIGS. 1 to 3, these seals are an O-ring 22 which connects the two ends of the flow channel 6, namely on the one hand at the mouth 4 and on the other hand at the mouth 5, sealed against each other. The O-ring 22 is in a along the lateral surface of the tap body 1 lying in an inclined plane, that is to say an elliptical groove 23 is inserted. The groove 23 could also be a different one Course, for example have a sine curve. In the case of other shapes of the tap body 1, for example in the case of a rectangular shape, O-rings are also possible, which are laid in ring grooves around the mouths in the flat outer surfaces of the cuboid. At the

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The example shown is also an O-ring 24 in an connect a radial plane of the cylindrical Hahr.körpers 1-CC-; Inserted groove 25, which the flow channel with regard to his the end located at the mouth 5 against the upper window of the cock housing serving to insert the cock body 1? seals. The corresponding grooves 23 and 25 for the O-rings can be seen in particular in FIG.

The seal between the valve body 1 and the tap body 3 erfordc ι special attention. In the case of elastic O-rings, the required surface pressure is achieved in that when the valve body 1 is pushed into the valve housing 3, the O-rings are compressed. After being inserted, the O-rings remain in place at Crt ur.d, at least they do not have to be pushed over the flow openings 20 and 21 when switching, as is the case with comparable sealed cylinder plugs, with corresponding abrasion and the risk of getting stuck in the event of high pressure.

Polytetrafluoroethylene is more chemically resistant to most chemicals and also more temperature resistant than the elastomeric material of the O-rings. However, due to its lower elasticity, it cannot be used in the form of O-rings. For this purpose, a seal according to FIG. 5 is possible, in which the O-ring 22 can be replaced by a flat ring made of polytetrafluoroethylene. Referring to FIG. 5, a faucet body 1 ¹ a a sc.irägen level the following diameter step 23 ', and has a valve housing 3' a of the step 23 'complementary inner diameter step 25'. When inserting the tap body 1 ¹ into the tap housing 3 ¹ , the sealing .Kreisring is inserted between the steps 23 'and 25'. The surface pressure required for the sealing effect t is determined by the pressing force of the; The cock body 1 'is brought into the cock housing 3', which can be achieved by appropriate dimensioning of the components in relation to the insertion groove of the locking ring 17 or, if necessary, by additional resilient construction

parts is to be ensured. If necessary, a corresponding Pair of steps, lying in a radial plane, also above

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be provided for sealing against the housing window, wherein of course, aspects of double passages and compressibility of the sealing material must be observed. Although the inclined steps 23 ', 25' eire rotation of the tap body 1 'in Prevent the cock housing 3 ', the locking by the pin 15 is still in place to avoid twisting and lifting loads and the recess 16 is provided.

If the locking with the pin 15 and the recess 16 is not given or the recess is an arcuate slot, in an embodiment according to FIGS. 1 to 4 of the The valve body 1 can also be used in conjunction with the valve body 3 for controlled flow restriction. In this case a relative rotating device must be switched on in a manner not shown between the tap body 1 and the tap housing 3 especially a worm gear with a small hand crank. In addition, a scale should show the mutual angle of rotation Show. If, for example, in the view according to FIG. 2, the tap body 1 is moved relative to the tap housing 3 by an angle of, for example Twisted 10 °, the mouths 4, 5 and the flow openings form 20, 21, which no longer fully coincide, each with Kreiszweiecki, but their edges due to the possible choice of material are not damaged by the flowing medium. When turned by 30 °, the mouths and are tangent the flow openings only, i.e. without actual coverage, the throttling is thus maximal. With the help of the ball plug 7, the throttled media flow can still pass through or be blocked.

It can be seen that the construction with the tap body 1 and the tap housing 3 can also be used on multi-way taps, which are commonly used in Way in the valve body 1 several flow channels with several mouths and have multiple sealing rings. In this case, however, the seal between the different mouths in the The gap between the tap body and the tap housing can be solved differently than in accordance with FIGS. 1 to 5, since the one in the inclined plane

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lying O-ring 22 or the polytetrafluoroethylene ring only can seal two mouths against each other. Instead graze in ring grooves that surround the individual mouths in a circle, 0-R.inge 'according to Fig. 6 is used.

In the case of the explanations according to all figures, the addition is conditional of the valve body 3, 3 'a slightly larger size compared to a conventional ball valve. This larger size However, this has no effect in most cases, as the tap housing already offers complete connection options can. In particular, there is no longer a need for a screwed-in nipple, as there may be already screwed-in nipples. in the Compared to screwed-on nipples, screwed-in nipples require more material and weight because they are located in the valve body or valve body require several load-bearing threads. Avoiding the need for screwed-in nipples is especially important with large ones Nipples are important, for example from a nominal diameter of 40 mm, since such screw-in nipples are either expensive or only with special machines can be produced.

Claims (10)

Expectations 1. Ball valve with a valve body, which has at least one flow channel extending between orifices, in which a rotatable ball plug with a flow bore, which rests against at least one seal, is turned on, on which a switching spindle connected outside of the valve body with a switch handle engages for its rotation, thereby characterized in that the tap body (1) with external mutual sealing (22) of its mouths (4, 5) is inserted into the cavity (2) of a rigid tap housing (3), removable through a housing window, and the tap housing (3) in turn on The location of the mouths (4, 5) of the tap body (1) has flow openings (20, 21) with pipe connection possibilities (18, 19). 2. Ball valve according to claim 1, characterized in that the valve housing (3) has its window in the region of the extended axis the spindle (12), preferably in the area of its protruding End, has and the tap body (1) in the direction of this axis in the window, it finally, can be pushed in or out of it Can be pulled out in the direction of this axis. / 2 3. Ball valve according to claim 1 or 2, characterized in that the valve body (1) and the cavity (2) of the valve body (3) have a substantially circular cylindrical shape. 4. Ball valve according to claim 1 or 2, characterized in that the valve body and the cavity of the valve body irr substantially have a conical shape. 5. Ball valve after opening 3 or 4, characterized in that the tap body (1) in the cavity (2) of the tap housing (3) can be rotated by at least a central angle. which is limited by the condition that the mutual sealing (22) of the mouths (4, 5) of the boat body (1) not with the flow openings (20, 21) of the valve body may come into contact. 6. Ball valve according to one of claims 1 to 5, characterized in that that the tap body (1) in the cavity (2) of the housing (3) on its inner wall with the interposition of sealants (22, 24) between the mouths (4, 5) with each other and iwiscnen the mouths and the window. 7. Ball valve according to claim 6, characterized in cla.3 in the Endless grooves (23, 25) located on the outer surface of the tap body (1) serve to accommodate the sealants (22. 24) (Fig. 1 to ■ '' 8. Ball valve according to claim 6, characterized in that the sealants are arranged between complementary steps (23 ', 25') arranged on the one hand on the inner wall of the Hahngeh ^ uses (3 ') and on the other hand on the outer wall of the cock body ("') (Fig. 5). 9. Ball valve according to one of claims 1 to 8, characterized in that a clamping sleeve (11 ') which is used for pressing the ball plug (7) on the di-r, ⁴ ungen (8, 9) in at least one of the Orifices (4, 5) of the individual flow channels (6) is loosely inserted, when the valve body is not inserted into the valve housing (3), by an elastically indentable white
the bet reff earth mouth forward (Fig. '} }. 10. Ball valve according to Eintm d ^ r claims; ■ '1 to 9, dac; ~ h characterized that d ^p "valve body (1) a ^ ur.ststof f-Spr;: z *; e"' l is.