DE3246622C2 - Piggable shut-off valve - Google Patents

Abstract

Piggable shut-off valve with a housing that has at least two connections, a shut-off element rotatably mounted in the housing, which has a passage that can be aligned with the connections and has approximately the same width as the connections, one of the connections or the passage in the shut-off element associated sealing arrangement in the housing, a bearing arrangement in the housing, through which a rotation of the shut-off element is effected about a fixed axis, and an adjusting element for actuating the shut-off element, the shut-off element having an outer cylindrical surface which cooperates in a sealing manner with a cylinder surface in the interior of the housing and which is traversed by a cylindrical passage and the shut-off element has at least one inner annular guide surface which is concentric to the outer cylindrical surface and which interacts with a corresponding counter-guide surface in the housing.

Description

The invention relates to a piggable shut-off valve with a housing that has at least two connections, a rotatable in the housing gcla-

Gerten shut-off device, which has a passage, which can optionally be aligned with the connections and has approximately the same width as the connections and which has an outer cylindrical surface which penetrates sealingly with a cylindrical passage Cooperating cylinder surface inside the housing, one of the connections or the passage in the shut-off device associated annular-cylindrical sealing arrangement containing elastically yielding material in the housing, a support ring engaging on one end face of the sealing arrangement, which with With the help of a pressing device against the sealing arrangement can be pressed while the other end face the sealing arrangement is supported fixed to the housing, an inner annular to the outer cylindrical surface concentric guide surface on the shut-off device with a corresponding counter guide surface in the housing cooperates

In a known piggable shut-off valve of the type mentioned at the outset, there is a cylindrical shut-off element provided (GB-PS 5 48 631). Between the shut-off element and the inner wall of the housing is a sleeve made of elastic Material arranged, with in their openings that with the passage in the housing or the shut-off element are alignable, a ring made of metallic material is arranged.

In many areas in which pigging technology is used, there is a demand for residue-free Pigging, d. H. full cleaning of the pipeline and associated fittings to the extent that remaining Residues do not affect the subsequent medium. In the case of pipelines, this requirement can be met relatively easily. However, difficulties arise for residue-free pigging for shut-off valves. Shut-off valves using ball or plug valves usually have one Cavity between the shut-off element and the housing, into which the pumped medium can penetrate, especially with Actuation of the shut-off device. The use of a shut-off valve with a cylindrical shut-off element of the type mentioned at the beginning largely avoids such a dead space. However, it has other disadvantages on. The elastic material of the sleeve between the housing and the shut-off element must not be compressible because the rings delimiting the openings would otherwise be floating. Because of this, however, leads the pressure of a disc against the elastic sleeve leads to extremely high pressure forces on the corresponding Areas of the shut-off element and housing without a proper seal being made were. In any case, the frictional force is to a large extent dependent on the pressure force, so that a Sufficient sealing force is only obtained with pressure forces in which an adjustment of the shut-off element can no longer be accomplished with normal forces.

The known shut-off valve of the type mentioned above also does not see a perfect central bearing the shut-off device before, rather this is only performed over the adjusting pin, while in the opposite Area a guide does not exist. If there is a pressure difference at the shut-off element, this will be pressed to one side, while on the opposite side a pressure relief and thus Reduction of the sealing effect takes place. In this way, Mcdiurr; penetrate the relieved area and step forward when the shut-off device is adjusted by the shut-off valve.

A shut-off valve with a trunnion-mounted cylindrical plug is known per se (DE-AS 10 70 463). However, the known shut-off valve cannot be pigged and is also not cavity-free.
The invention is based on the object of improving a shut-off valve of the type mentioned in such a way that it can be pigged perfectly without residue, the shut-off element is properly sealed from the housing, there is little wear on the sealing material and the shut-off element is easily adjustable despite the high sealing force

According to the invention, this object is achieved in that the annular cylindrical layer is made of elastomeric material is compressible in the axial direction, a second ring-cylindrical layer made of sealing bearing material, preferably made of PTFE, which is concentric to the first layer on the outside or on the inside, the annular cylindrical layers are rotationally fixed relative to the shut-off device or to the housing, namely with respect to the component facing the first annular cylindrical layer, and that two on the shut-off device annular axially spaced Fühnwgsflächen arranged are those with corresponding annular guide surfaces of the housing cooperate.

In the shut-off valve according to the invention two annular cylindrical layers arranged concentrically to one another, the elastomeric layer in each case is rotationally fixed relative to the component to which it is facing. The relative movement takes place accordingly the other component and the bearing layer instead of using the axially compressible annular cylindrical Layer, a radial pressure can be exerted on the bearing layer over the entire axial length, which pressure is therefore effectively sealing against the assigned surface of the shut-off device or housing. An effective Storage material is z. B. PTFE It also has sufficient to excellent sealing properties the construction according to the invention come to fruition.

A pressure difference of a shut-off valve does not lead to a one-sided pressurization in the Dic ^: -.:ungsbereich with simultaneous relief of the other sealing area with the danger that medium can penetrate in the relieved area. Rather, the central guidance of the shut-off element enables the sealing cylinder surfaces to rest evenly against one another, which also reduces wear. The effective sealing of the shut-off element in the shut-off valve according to the invention also means that it is not necessary to effectively seal the actuating element, which is, for example, a control shaft mounted in the housing, for example by means of a stuffing box arrangement. Rather, the shut-off valve according to the invention can be designed without a stuffing box.

For a particularly effective seal for a longer one To achieve axial extension, one embodiment of the invention provides that in the first annular Layer holes are provided or the annular layer has a lattice-like structure. Elastomer Material is usually not very compressible. By making holes, slits or forming a lattice-like structure, compression of the sealing elastomeric material can be achieved.

An alternative solution to the problem according to the invention is that the sealing arrangement consists of two conical bearing and / or sealing sleeves; loading

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stands, which jind pushed into one another with adjacent conical surfaces, with a bearing and Sealing sleeve is supported on the housing and the other bearing and sealing sleeve from a clamping device in Direction of the other sleeve is biased and the sealing arrangement relative to the shut-off element or Housing is non-rotatable. The width of the seal and bearing arrangement can be achieved by axial compression of the bearing and sealing sleeves vary to a limited extent and thus to the respective dimensions and Adjust tolerances. Above all, a full contact with the two cylinder surfaces can be achieved without the adjustability of the shut-off element would be particularly difficult. The sealing and bearing sleeves can be in can be produced in undivided form. According to a further embodiment of the invention, they can also be divided be. In this case they are cut from the appropriate tape material. The ends are then Butt to butt or with diagonally cut end faces against each other, around the king space between the shut-off element and housing to be filled out completely. Especially with the latter configuration, the effort is increased particularly low for the sealing arrangement.

So that the bearing and sealing arrangement described rotatably relative to a part of the shut-off valve is, a further embodiment of the invention provides that the first bearing and sealing sleeve rotatably on one arranged ring element is supported. According to a further embodiment of the invention, the ring element can be designed to be resilient in the axial direction. This can be done, for example, with the help of two or more disc springs can be achieved, a ring-shaped spiral spring, a meander spring or by a O-ring.

According to a further embodiment of the invention, the other bearing and sealing sleeve is a pressure ring acted upon, which in turn is arranged non-rotatably. The bearing- and axially tension the seal assembly.

For effective guidance of the shut-off element, a further embodiment of the invention provides that the The pressing device has a cover plate which closes the housing and has an axial collar, one of the mating guide surfaces is also formed on its circumference Solution is provided that the pressing device two opposite the housing Has side closing cover plates, both of which have an axial collar, on the circumference the housing-fixed mating guide surfaces are formed. To attach the cover plate, see another Embodiment of the invention that the housing has a cylinder jacket and the cover plate Has internal thread which is screwed onto the external thread of the cylinder jacket In an embodiment of the invention, the cover plate is screwed tightly to the cylinder jacket by means of a cap nut

The invention is explained in more detail below with reference to drawings

F i g. 1 shows a section through a schematically illustrated shut-off valve according to the invention.

Fig.2 shows a section through the fitting according to F i g. 1 along line 2-2.

F i g. 3 shows another embodiment of a shut-off valve according to the invention in section

4 shows a section through the fitting according to F i g. 3 along line 4-4.

Fig. 5 shows a detail of a sealing arrangement the shut-off valve according to FIGS. 3 and 4.

FIG. 6 shows a similar sectional view through a shut-off valve according to the invention as in FIG F i g. 2 and 4, but applied to a three-way valve.

Fig. 7 shows schematically a section through a modified one Shut-off device.

F i g. 8 shows a section through a schematically illustrated shut-off element in yet another embodiment.

F i g. 9 shows, partially in plan view, a locking ring for the shut-off valve according to the invention.
FIG. 10 shows a section through the shut-off valve according to the invention, similar to FIG. 1, but with additional features.

F i g. 11 shows a section through the shut-off valve according to FIG. 10 along the line 11 -11.
The in the F ι g. The shut-off valve shown in t and 2 has a housing 10 and a shut-off element 11. The housing 10 contains a cylinder jacket 12 which is closed off at the end faces by an upper cover plate 13 and a lower cover plate 14. The cylinder jacket 12 has an external thread at the ends, onto which an upper throw ring 15 or 16 can be screwed with a radial flange 17 or 18 which rests on the outside of the cover plate 13 or 14. The cover plate

13, 14 has a circumferential recess on the lower edge into which the end faces of the cylinder jacket engage, whereby the cover plates 13, 14 are also set radially.

In a bore of the cover plate 13 is a switching shaft 19 carried out, which has two spaced apart grooves 20, 21 in which bronze sealing rings 22 and 23 respectively received are for storage and sealing. At the lower end of the selector shaft 19 is a disk 24 attached, the circumference of which is shaped with cams such that that the disc 24 relative to a pin 25, which is fastened in the cover plate 13 and protrudes into the interior of the housing, only by an angle of 90 ° is rotatable.

In the cylinder jacket 12 diametrically opposite openings 26 and 27 are formed with connecting lines or nozzles 28 and 29 are aligned.

The shut-off element 11 also consists of an annular cylinder 30 which is diametrically opposite to the longitudinal center Has bores into which a pipe section 31 is inserted, which has a cylindrical passage 32 forms which can be aligned with the connecting pieces 28, 29, the nominal width of the passage 32 being the nominal width the connection piece 28, 29 corresponds. The pipe section 31 is fastened in the ring cylinder 30 by welding. An adjusting ring 33 is welded onto the pipe section 31 and is correspondingly shaped Recess of the disc 24 engages. Rotation of the selector shaft 19 therefore leads to the rotation of the Shut-off element 11 about its axis of rotation.

The cover plates 13, 14 are provided with central axial collars 34, 35, on the circumference of which bronze bearing rings 36 and 37 are arranged. The bronze rings 36, 37 are in engagement with guide surfaces 38 and 39, respectively at the ends and the inside of the ring cylinder 30. In this way, the ring cylinder 30 is guided radially The axial securing takes place via the cover plates 13,

14, up to the underside of which the ends of the ring cylinder 30 extend.

The ring cylinder 30 has a on its outside

Cylinder surface 40. The cylinder jacket 12 has on its Inside a cylinder surface 41. The cylinder surfaces 40, 41 are located at a radial distance and the annular gap formed thereby is through a sealing arrangement filled in, which consist of two conical bearing sleeves 42, 43. The bearing sleeve 42 is on the inside conically shaped, while the bearing sleeve 43 is conically shaped on the outside so that, as shown in FIG ersicimich, can be nested almost completely into one another, if the preferably self-locking effect Taper angle is chosen approximately the same. The bearing sleeves are made of PTFE, which material is known has good storage and sealing properties. The lower sleeve 43 is supported by a locking ring 44 on an annular element 45 yielding in the axial direction. This can be an O-ring, for example be a coil spring or the like. The shape of the locking ring is shown in FIG. 9 emerges. He owns on on the side facing the bearing ring 43, several spaced-apart pins 46 which are inserted into the end face of the bearing sleeve 42 are buried so that the locking ring 44 is connected to the bearing sleeve 43 in a rotationally fixed manner. The locking ring 44 also has a plurality of radial projections 47 circumferentially spaced from one another with recesses 48 cooperate at the ends and the inside of the cylinder jacket 12 and thereby the locking ring set in the circumferential direction. The recesses also take pins 49 on the cover plate 14 to center them and arrange them in the correct position. The upper bearing sleeve 42 is supported on a similar one Circlip from, so that this need no longer be discussed in detail. On the A pressure ring 50 is seated on the upper securing ring 44 and rests against the underside of the cover plate 13. Above a corresponding pressure of the cover plate 13 can therefore be achieved primarily from the bearing sleeves 42 and 43 existing sealing arrangement are placed under compressive stress, so that the bearing sleeves 42, 43 are fed up apply against the associated cylinder surfaces 40 and 41 and for an effective seal in the described Provide an annular gap.

During assembly, the bearing sleeves 42, 43 are used without a through-hole. This is then produced after complete installation, to ensure that this through-hole is correctly aligned with the passage or to the connections 28,29.

The dash-dotted lines 51 in the cover plate 14 is intended to indicate that a further Shift shaft can be mounted in a corresponding through hole in the cover plate 14. In the cover plate 14 a bore 52 is also provided over the medium can escape into the cavity outside the pipe section 31 and inside the annular cylinder 30 is pressed

The embodiment according to FIGS. 3 and 4 largely agrees with FIGS. 1 and 2 match. Only that The sealing arrangement between the cylinder surfaces 40, 41 is designed differently. It consists of a ring cylindrical Layer 53 made of PTFE and an annular cylindrical layer 54 arranged around it an elastomeric sealing material. Both layers 53, 54 can be tubular! Raw material cut will. However, they can also be formed from flat material by placing sections in a tubular shape are with butt ends. This is also a way of manufacturing the bearing sleeves 42, 43 of the embodiment according to FIGS. 1 and 2. The PTFE layer 53 can be in the same manner as the bearing sleeves 42, 43 according to FIG. 1 can be fixed relative to the housing 10 with the aid of circlips 44. The layer 54 can be vulcanized on the cylinder surface 41, for example. However, it can also be loose be inserted and in turn held non-rotatably. The lower locking ring 44 is based on a rigid Ring element 45, i from.

F i g. 5 shows a detail of FIG. 3. It can be seen that the layer 53 of elastomeric material is penetrated with holes 56. In this way, the layer 53 can be axially compressed to a limited extent in order to increase the sealing effect. It goes without saying, moreover, that in the embodiment according to FIGS. 3 to 5, the layers 53, 54 can also be arranged interchanged. In this case, however, they are fixedly arranged relative to the shut-off element 11 and move relative to the inner cylindrical surface 41 of the casing 12.
The sectional view according to FIG. 6 is similar to that according to K i g. 2 and 4. On the cylinder jacket 12a of the housing, however, three connections 58, 59, 60 are arranged at a distance of 120 °, which are in a plane perpendicular to the plane of rotation of the shut-off element, which is shown in FIG. 6 is indicated by the ring cylinder 30a. So that the individual connections 58 to 60 can be optionally connected, the ring cylinder 30a is penetrated by a curved pipe section 31a with a passage 32a. The sealing arrangement 57 corresponds approximately to that according to FIGS. 1 or 3.

In Fig. 7 it is indicated very schematically that a shut-off element 11f »two curved pipe pieces 61, 62 may have for the optional connection of connections (not shown) at a circumferential distance of 90 °.

The shut-off device, which is again shown very schematically Hein Fig.8 has a curved piece of pipe 63 corresponding to the pipe section 31a according to FIG. 6. Opposite the ends of the passage thus formed In the Absiäiid offset by 120 ° is a pocket S4 recessed, which can optionally be aligned with a connection for receiving a pig, such as it is shown schematically at 65 in FIG. 8 is shown.

The embodiment according to FIGS. 10 and 11 are the same essentially the one according to FIGS. 1 and 2, therefore the same parts have been given the same reference numerals. As in particular from FIG. 11 can be seen v / eist the cylinder jacket 12, however, two further connections 66,67, which are diametrically opposed to each other in the plane of the connections 28, 29 are opposite and are offset by 90 ° with respect to the latter. At connection 66 can with A pig receiving chamber 69 is coupled with the aid of a coupling arrangement 68 which is not described in detail wtrden for receiving a pig 70. In the passage 32 a pig stop pin 71 is attached, against the the pig 70 starts up when it enters the fitting via the connection 28. One thus trapped in passage 32 The pig 70 can then enter the pig chamber 69 by turning the shut-off element clockwise by 90 ° be promoted. The pig 70 can also be sent via the connection 67 if the shut-off element is rotated counterclockwise by 90 °, so that the passage 32 is aligned with the connection 67 is

As can be seen from the individual figures, the individual embodiments are welded constructions, which can be manufactured with particularly little effort. It is understood, however, that castings are also used can be.

As already mentioned at the beginning, the lid

plates 13, 14 are replaced by corresponding rings, so that the interior of the housing from two sides
is accessible. If medium gets into this room,
it can be washed out from the outside. The shut-off element 11 is then adjusted via a
separate adjusting element, for example a key,
which is brought into engagement with the Vei adjusting ring 23.

For this purpose 4 sheets of drawings

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Claims (15)

Patent claims: 1. Piggable shut-off valve with a housing that has at least two connections, a shut-off element rotatably mounted in the housing, which has a passage that can be aligned with the connections and has approximately the same width as the connections and which has an outer cylindrical surface that cooperates sealingly with a cylindrical surface in the interior of the housing penetrated by a cylindrical passage, an annular-cylindrical, elastically yielding material-containing sealing arrangement in the housing assigned to the connections or the passage in the shut-off element, a support ring engaging the sealing arrangement on one end face, which can be pressed against the sealing arrangement with the aid of a pressing device, while the other end face of the sealing arrangement is supported in a fixed manner to the housing, an inner annular guide surface on the shut-off element which is concentric to the outer cylinder surface and which is connected to a corresponding counter-guide surface surface cooperates in the housing, characterized in that the ring-cylindrical layer (54) made of elastomeric material is compressible in the axial direction, a second ring-cylindrical layer (53) made of sealing bearing material, preferably made of PTFE, is provided, which is concentric to the first layer (54 ) outside or inside adjoins this, the ring-cylindrical slides (54, 53) are fixed relative to the shut-off element (11) or to the housing (10), namely with respect to the construction cable facing the first ring-cylindrical layer (54) k% and that two annular, axially spaced guide surfaces are arranged on the shut-off device (11), which cooperate with correspondingly annular guide surfaces (38, 39) of the housing (10). 2. Shut-off valve according to claim 1, characterized in that that in the first annular layer (54) holes (56) are provided or the annular Layer has a grid-like structure. 3. Piggable shut-off valve with a housing which has at least two connections, a shut-off element rotatably mounted in the housing, which has a passage that can be aligned with the connections and has approximately the same width as the connections and which has an outer cylinder surface that cooperates sealingly with a cylinder surface in the interior of the housing penetrated by a cylindrical passage, an annular-cylindrical, elastically yielding material-containing sealing arrangement in the housing assigned to the connections or the passage in the shut-off element, a support ring engaging the sealing arrangement on one end face, which with the help of a pressure device can be pressed against the sealing arrangement, while the other end face of the sealing arrangement is supported fixed to the housing. an inner ring-shaped guide surface on the shut-off element which is concentric with the outer cylinder surface and which interacts with a corresponding counter-guide surface in the housing, characterized in that the sealing arrangement consists of two conical bearing and / or sealing sleeves which are pushed into one another with adjacent conical surface areas, with a bearing and sealing sleeve (43) is supported on the housing (10) and the other bearing and sealing sleeve (42) is prestressed by a clamping device in the direction of the other sleeve and the sealing arrangement is non-rotatable relative to the shut-off element (11) or to the housing (10). 4. Shut-off valve according to claim 3, characterized in that that the bearing and sealing sleeves (42, 43) are divided. 5. Shut-off valve according to claim 3 or 4, characterized in that the first bearing and Sealing sleeve is supported on non-rotatably arranged ring elements (44, 45) 6. Shut-off valve according to claim 5, characterized in that the ring element (45) in the axial Direction is resilient 7. Shut-off valve according to one of claims 3 to 6, characterized in that the other bearing and the sealing sleeve (42) is acted upon by a pressure ring (50) which in turn is arranged in a rotationally fixed manner is S. Shut-off valve according to one of Claims 3 to 7, characterized in that the bearing and Sealing sleeves (42, 43) are connected to a safety ring (44) which in turn is non-rotatable in the housing (10) is secured. 9. Shut-off valve according to claim 8, characterized in that the safety ring (44) at least has a radial projection (47) which engages in a recess (48) of the housing (10) 10. shut-off valve according to one of claims 1 or 2, characterized in that the pressing device has a cover plate closing off the housing which has an axial collar (34, 35), on the circumference of which there is also one of the counter-guide surfaces is trained 11. Shut-off valve according to claim J, characterized in that that the pressing device closes the housing (10) on opposite sides Has cover plates (13,14), both of which have an axial collar (34, 35) on which The circumference of the mating guide surfaces fixed to the housing are formed. 12. Shut-off valve according to claim 6 or 7 and 10 or 11, characterized in that the resilient Ring element (45) and / or the pressure ring (50) are supported on the associated cover plate (13, 14). 13. AbsperrarVnatur according to one of claims 10 to 12, characterized in that the housing (10) has a cylinder jacket (12) and the cover plate has an internal thread which connects to an external thread of the cylinder jacket is screwed. 14. Shut-off valve according to claim 13, characterized in that the cover plate (13,14) by means a union nut (15 "16) is screwed to the housing (10). 15. Shut-off valve according to one of claims 1 to 14, characterized in that a sliding ring (36,37), for example made of bronze, forms a housing-proof guide surface.