Gate valve, sealing seat, and method for assembling a gate valve

Abstract

The invention relates to a gate valve (10) having at least one slide plate (12) arranged in a plate holder (11), and having a pipe bridge which is movable by actuating a slide rod (15) in order to shut off and open a line comprising at least one pipe nozzle (14), wherein a sealing seat (16) is arranged on a side of the pipe nozzle (14) which is close to the at least one slide plate (12). The aim of the invention is to make it possible to replace the sealing seat (16) without specialized machinery and without a suitable workshop at the place of use of the gate valve assembly (10). This aim is achieved in that the sealing seat (16) is a plugged-in sealing seat (16). The invention also relates to a sealing seat (16) and to a method for assembling a gate valve (10).

Description

[0001] M / Z+J-277-PC

[0002] Z & J Technologies GmbH JK / FF / avc

[0003] Plate gate valve, sealing seat and method for mounting a plate gate valve

[0004] Description

[0005] The invention relates to a plate valve according to the features of the preamble of claim 1, a sealing seat according to the features of claim 9 and a method for mounting a plate valve according to claim 12.

[0006] From EP 3 670 978 A1, a plate gate valve with two gate plates arranged in a plate cage is known. In these so-called double-plate gate valves, the gate plates are forced apart in the closed position by a wedge arrangement between the gate plates and pressed against correspondingly arranged pipe stubs. The wedge arrangement is actuated directly by the valve rod, which moves the plate cage containing the gate plates.

[0007] To ensure the gate plate closes securely and reliably on the pipe stub in the shut-off position, a sealing seat is arranged on one side of the pipe stub facing the gate plate. This seals the pipe stub against the gate plate and, if applicable, against the plate cage.

[0008] Due to the significant forces acting on the sealing seat during operation, it is subject to wear, requiring repair every 4 to 8 years. Depending on the degree of wear or in the case of damage, the repair can range from machining and welding to complete replacement of the sealing seat. These repair methods all require specialized machinery and a suitable workshop.

[0009] These conditions are often only met at the manufacturer's factory for the double-plate slide valve. If a repair there fails for logistical or other reasons, this leads to compromises in the quality of the repair kit M / Z+J-277-PC.

[0010] 2 tongue, which regularly impairs the function of the double plate slider as a consequence.

[0011] In practice, various designs of sealing seats are used. With a fixed sealing seat, it is integrally formed with the pipe stub. The sealing surface for the valve plate is therefore also located on the pipe stub itself. During repair, additional material must be welded on to restore the sealing surface. This demanding process requires specialized tools and highly trained personnel. An example of a fixed sealing seat known from the prior art is shown in Fig. 1.

[0012] An alternative is provided by weld-in sealing seats, as described in EP 3 670 978 Al mentioned at the beginning. These differ from the aforementioned fixed sealing seats in that the sealing seat encompassing the sealing surface is a separately manufactured component that is welded into a suitably prepared pipe stub. Therefore, weld-in sealing seats are also suitable for repairing double-plate gate valves with fixed sealing seats.

[0013] Both installation and replacement of weld-in sealing seats require machining of the pipe stub in the form of welding. Furthermore, the sealing seam, which ensures a seal on a radially inner side between the pipe stub and the sealing seat, as well as the fastening seam, which secures the sealing seat to the pipe stub on a radially outer side, must be welded. Stress-relief annealing and final machining of the sealing surface are also necessary. Therefore, both the installation and replacement of weld-in sealing seats require specialized tools and specially trained personnel.

[0014] To avoid welding, screw-in sealing seats were developed. These are characterized by the fact that the sealing seat is screwed into the pipe stub in an axial direction on a radially outer side. A disadvantage of this design is, among other things, the complex thread manufacturing process. Due to the high forces acting on the screws, sometimes for several years, their loosening capability can be impaired. Because the sealing seat is positioned in the primary force-fit area, leakage can occur under alternating loads. M / Z+J-277-PC

[0015] Three more things come up. Furthermore, the lateral attachment on the radially outer side causes the sealing seat to tilt during assembly.

[0016] A common design for avoiding costly repairs at the point of use is the use of screw-on pipe fittings with an integrated sealing seat. During maintenance, the entire pipe fitting is replaced, rather than machined or replaced. However, this also results in the replacement of parts that are not affected by wear at all.

[0017] The present invention is based on the objective of describing a plate valve that allows for easy replacement of the sealing seat. This replacement can therefore be carried out at the point of use of the plate valve without specialized machinery or a suitable workshop.

[0018] According to the invention, this problem is solved by a plate valve with the feature of claim 1. A sealing seat according to the invention is the subject of claim 9, a method for mounting a plate valve is the subject of claim 12. Advantageous embodiments are the subject of the dependent claims.

[0019] The plate gate valve according to the invention comprises at least one gate plate, which is arranged in a plate cage. Furthermore, the plate gate valve comprises a pipe bridge. The gate plate and the pipe bridge are movable by actuating a gate rod in order to close and open a line comprising at least one pipe stub. To ensure a reliable seal between the pipe stub and the gate plate in the closed state, a sealing seat is arranged on one side of the pipe stub facing the gate plate.

[0020] The invention is characterized in that this sealing seat is a push-fit sealing seat. This means that the sealing seat is inserted into a corresponding geometry of the pipe stub during assembly and is not otherwise connected to the pipe stub. In the final assembled state or in the operating state, the sealing seat is pushed in place. M / Z+J-277-PC

[0021] 4

[0022] This design makes it surprisingly easy to ensure a reliable seal for a gate valve without having to weld or screw the sealing seat into the pipe stub. This has resulted in a maintenance-friendly gate valve that allows for easy replacement of the sealing seat without special tools or specially trained personnel.

[0023] Preferred embodiments are specified in the sub-claims. It can be provided that at least one guide plate secures the sealing seat against axial displacement. The axial direction is understood to be the direction perpendicular to the gate plate and in which a medium can flow through the gate valve in an open position. With such a design, the guide plate acquires a secondary function in addition to its primary function of providing a guide for the pipe bridge and the gate plate cage. It serves a securing function. When the gate valve is in the closed position, the sealing seat is additionally held in position by the gate plate cage.

[0024] If at least one guide plate is provided to secure the sealing seat against axial displacement, the sealing seat, according to a further preferred embodiment, can have at least one projection on a radially outer side. In the assembled state, this projection is arranged between the pipe stub and the guide plate, whereby the entire sealing seat is held in the desired position by these two components. Such a design is particularly advantageous because the fixing of the sealing seat takes place far from the sealing surface, so that the latter is not affected by the fixing.

[0025] According to a further preferred embodiment, the sealing seat has a groove on a radially inner side. In particular, the groove provides a defined point of engagement for an assembly tool, thereby making the assembly and / or disassembly of the sealing seat simpler and less prone to errors.

[0026] According to a further preferred embodiment, the sealing seat has an insertion chamfer on the radially outer side facing away from the slide plate in the mounting position. The insertion chamfer facilitates the insertion of the M / Z+J-277-PC.

[0027] 5

[0028] It creates a tight seal in the pipe stub and simultaneously reduces the risk of damage.

[0029] In principle, a wide variety of materials are conceivable for the sealing seat. Due to the very high forces acting on the sealing seat, a preferred embodiment uses a metallic material. This allows for a satisfactory compromise between the flexibility required for sealing and the necessary durability; furthermore, these parameters can be optimally adapted to the specific application by selecting a suitable alloy.

[0030] According to a further preferred embodiment, a sealing element can be arranged radially between the pipe stub and the sealing seat. Such a design has the particular advantage that the sealing element is located in a force bypass. This means it is unaffected by the forces acting on the sealing seat. This represents an additional measure against unwanted leakage.

[0031] For the same purpose, according to a further preferred embodiment, the sealing seat has a hardened surface on its side opposite the sealing surface, i.e., on the side facing the pipe stub in the axial direction. In addition to the seal formed by the sealing seat and the valve plate, a further seal can thus be formed by the sealing seat and the pipe stub, so that the valve plate has a metallic double seal.

[0032] A plate gate valve according to one of the embodiments described above is particularly distinguished by the fact that the pipe stub does not require any machining to change the sealing seat. Neither a special machine nor welding is necessary, or at least not technically demanding welding. Heat treatment is also no longer required. This offers the advantage that the sealing seat can be replaced at the plate gate valve's point of use, and the plate gate valve does not need to be taken to a workshop.

[0033] Furthermore, the present application claims a sealing seat as such, independent of the plate valve. A sealing seat according to the invention for a plate valve is characterized by a projection on an M / Z+J-277-PC

[0034] 6. radially outer side. The projection is designed and configured to be positioned axially between a pipe stub and a guide plate. This arrangement enables the sealing seat to be fixed, in particular securing it against axial displacement. Furthermore, the sealing seat according to the invention is characterized by a groove located on a radially inner side of the sealing seat. The groove is designed to engage an assembly tool, thus facilitating both the assembly and disassembly of the sealing seat. Also characteristic of the sealing seat according to the invention is an insertion chamfer, which allows for increased positional tolerances between the pipe stub and the sealing seat during assembly, thereby simplifying the insertion of the sealing seat into a corresponding geometry of the pipe stub.

[0035] Preferably, the sealing surface is made of a metallic material. As described above, this allows for a satisfactory compromise between the flexibility required for the sealing effect and durability; furthermore, these parameters can be optimally adapted to the individual application by selecting a suitable alloy.

[0036] According to a preferred embodiment, the sealing seat has a sealing surface on each of two axially opposite sides. One sealing surface is designed to abut a plate cage and a gate plate of a plate gate valve. The other sealing surface is designed to abut the pipe stub. When the sealing seat is used in a plate gate valve, this results in a double seal.

[0037] An inventive method for mounting a plate gate valve comprises the following steps: A sealing seat is inserted into a corresponding geometry of a pipe stub. Subsequently, at least one guide plate is mounted, thereby fixing the axial position of the sealing seat. Furthermore, a pipe bridge and a plate cage with at least one gate plate arranged therein are mounted. Such a mounting method is very simple and is characterized by the fact that neither welding nor bolting is required to fix the sealing seat in the pipe stub, nor is any comparable fastening method necessary. For this reason, the mounting of the plate gate valve can be carried out at the point of use without special tools or specially trained personnel. M / Z+J-277-PC

[0038] 7

[0039] According to a preferred embodiment of the method, a sealing element is arranged on a radially inward-facing side of the pipe stub before the sealing seat is inserted into the corresponding geometry of the pipe stub. This provides additional protection against unwanted leakage. Arranging the sealing element on a radially inward-facing side of the pipe stub has the advantage that the sealing element is positioned in the secondary flow of forces. This prevents it from being affected by forces acting on the sealing seat.

[0040] According to a preferred embodiment, an insertion chamfer provided on the sealing seat simplifies the insertion of the sealing seat into the corresponding geometry of the pipe stub. The insertion chamfer allows for an increase in the positional tolerances between the sealing seat and the pipe stub.

[0041] According to a further preferred embodiment of the method, an assembly tool is used when inserting the sealing seat into the corresponding geometry of the pipe stub. This tool engages in a groove formed on a radially inner side of the sealing seat. The disassembly of the sealing seat can be carried out according to the same principle, but in reverse. Here too, the assembly tool engages in the groove and pulls the sealing seat out of the corresponding geometry of the pipe stub.

[0042] The invention is explained in more detail below with reference to the attached schematic drawings.

[0043] These show:

[0044] Fig. 1 shows a plate gate known from the prior art, designed as a double plate gate, with a fixed sealing seat; and

[0045] Fig. 2 shows a detailed view of a preferred embodiment of a plate slide according to the invention.

[0046] Fig. 1 shows a plate gate valve 10 known from the prior art, which is designed as a double plate gate valve. The plate gate valve 10 comprises a housing 23 on which two pipe nozzles 14 are arranged. The pipe nozzles are M / Z+J-277-PC

[0047] 8 zen 14 are connected in the installed state with corresponding lines (not shown), in particular flanged to them.

[0048] A valve rod 15, a plate basket 11, and a pipe bridge 13 are arranged in the housing 23 and are connected to one another, with the plate basket 11 positioned between the pipe bridge 13 and the valve rod 15. The pipe bridge 13 and the plate basket 11 are movable along the longitudinal axis of the valve rod 15. The valve rod 15 allows the pipe bridge 13 and the plate basket 11 to be moved into an open and a closed position. Guide plates 17 arranged within the housing 23 provide axial guidance for the plate basket 11 and the pipe bridge 13 when they are moved by means of the valve rod 15. In the closed position shown, the plate basket 11 is positioned between the pipe ports 14, and in the open position, the pipe bridge 13 is positioned between the pipe ports 14.

[0049] In the known embodiment shown in Fig. 1, sliding plates 12 are arranged in the plate basket 11, in particular loosely inserted. The sliding plates 12 are arranged concentrically and parallel to each other.

[0050] The plate gate valve 10 is designed to tightly close the pipe stubs 14 in the shut-off position. For this to work, the gate plates 12 and the pipe stubs 14 must be in a sealing relationship with each other.

[0051] The embodiment shown in Fig. 1 features a fixed sealing seat. This design is characterized by the fact that the sealing seat is integrally formed with the pipe stub 14. The sealing surface 21 is formed on one side of the pipe stub 14 facing the gate plate 12. To ensure or improve the sealing effect, the gate basket 11 also rests against the sealing surface 21 of the pipe stub 14 in the shut-off position.

[0052] Due to the forces occurring during operation, such plate gate valves 10, and in particular the sealing surfaces 21, are subject to increased wear. Repairing the double plate gate valve shown in Fig. 1 requires special machinery and trained personnel, as material must first be welded onto the side of the pipe stub 14 facing the gate plate 12 and then reworked to restore the sealing surface 21. M / Z+J-277-PC

[0053] 9

[0054] Fig. 2 shows a detailed view X of a preferred embodiment of a plate slide 10 according to the invention, in which the maintenance effort is significantly reduced.

[0055] According to the invention, the sealing seat 16 is not integrally formed with the pipe stub 14, as in the known embodiment shown in Fig. 1, but is a separate component. For this purpose, the sealing seat 16 has a shape on its side facing away from the slide plate 12 that corresponds to the shape of the pipe stub 14 facing the slide plate 12. In other words, the sealing seat 16 is inserted into the corresponding geometry of the pipe stub 14.

[0056] To simplify assembly and disassembly, the sealing seat 16 has a groove 19 on its radially inner side. An assembly tool (not shown) can engage in this groove to insert the sealing seat 16 into or remove it from the pipe stub 14.

[0057] On the opposite, radially outer side of the sealing seat 16, it has a projection 18. On the side facing away from the valve plate 12 in the axial direction, the projection 18 also rests against the pipe stub 14. On the side of the projection 18 facing towards the valve plate 12 in the axial direction, the guide plate 17 rests against it. This provides an additional measure to secure the sealing seat 16 against axial displacement by fixing the projection 18 of the sealing seat 16 between the pipe stub 14 and the guide plate 17.

[0058] To further simplify assembly, the sealing seat 16 has a chamfer 22 on its radially outer side, facing away from the slide plate 12 in the axial direction. When inserting the sealing seat 16 into the pipe stub 14, which is done vertically from bottom to top as shown in Fig. 2, the chamfer 22 facilitates the positioning of the sealing seat 16 and thus prevents damage to the sealing seat 16 or the pipe stub 14 during assembly.

[0059] A sealing element 20 is provided on a radially outer side of the sealing seat 16 between the sealing seat 16 and the pipe stub 14. This represents an additional precaution to ensure the tightness of the plate gate valve 10. In particular, the sealing element 20 prevents leakage from occurring via a contact section between the sealing seat 16 and the pipe stub 14. The M / Z+J-277-PC

[0060] 10

[0061] Positioning the sealing element 20 in a radial direction is advantageous because it is located in the secondary flow of forces at this point. Therefore, its function is not impaired by the forces acting on the sealing seat 16.

[0062] As shown in Fig. 1, Fig. 2 also illustrates the closed position of the gate valve 10. In this position, both the plate cage 11 and the valve plate 12 are in sealing contact with the sealing surface 21 of the sealing seat 16. This design ensures that the gate valve 10 provides the best possible seal in the closed position.

[0063] If this is no longer the case due to operational wear or other damage, the worn sealing seat 16 can be removed and replaced with a new one at the point of use with manageable effort and standard tools. Machining of the pipe stub 14 or the sealing seat 16 is not required.

[0064] M / Z+J-277-PC

[0065] 11

[0066] Reference symbol list

[0067] 10 plate slides

[0068] 11 plate basket

[0069] 12 Valve plate 13 Pipe bridge

[0070] 14 pipe fittings

[0071] 15 slider rod

[0072] 16 Sealing seat

[0073] 17 Guide plate 18 Protrusion

[0074] 19 Nut

[0075] 20 sealing elements

[0076] 21 Sealing surface

[0077] 22 Lead-in chamfer 23 Housing

Claims

M / Z+J-277-PC Z & J Technologies GmbH JK / FF / avc Plate gate valve, sealing seat and method for mounting a plate gate valve Claims 1. Plate gate valve (10) with at least one gate plate (12) arranged in a plate basket (11) and a pipe bridge (13) which can be moved to shut off and open a line comprising at least one pipe stub (14) by actuating a gate rod (15), wherein a sealing seat (16) is arranged on one side of the pipe stub (14) facing the at least one gate plate (12), which is characterized by the fact that the sealing seat (16) is a plug-in sealing seat (16).

2. Plate slide (10) according to claim 1, characterized by the fact that the sealing seat (16) is secured against axial displacement by at least one guide plate (17) which serves to guide the plate basket (11).

3. Plate valve (10) according to claim 2, characterized by the fact that the sealing seat (16) has at least one projection (18) on a radially outer side, wherein the at least one projection (18) is arranged in the axial direction between the at least one pipe stub (14) and the at least one guide plate (17).

4. Plate slide (10) according to one of the preceding claims, characterized by the fact that the sealing seat (16) has a groove (19) on a radially inner side for assembly and / or disassembly.

5. Plate slide (10) according to one of the preceding claims, M / Z+J-277-PC 2 dad u rch kenn nzeich net that the sealing seat (16) has an insertion ramp (22).

6. Plate slide (10) according to one of the preceding claims, characterized by the fact that the sealing seat (16) is made of a metallic material.

7. Plate valve (10) according to one of the preceding claims, characterized by the fact that a sealing element (20) is arranged in a radial direction between the at least one pipe stub (14) and the sealing seat (16).

8. Plate valve (10) according to one of the preceding claims, characterized by the fact that the sealing seat (16) has a reinforcement on a side facing the pipe stub (14) in the axial direction to form a metallic double seal.

9. Sealing seat (16) for a plate gate valve (10) with at least one gate plate (12) arranged in a plate basket (11) and a pipe bridge (13) which can be moved to shut off and open a line comprising at least one pipe stub (14) by actuating a gate rod (15), kenn nzei ch net du rch - a projection (18) on a radially outer side, which is designed and configured for arrangement in the axial direction between the pipe nozzle (14) and a guide plate (17) which serves to guide the plate basket (11), - a groove (19) on a radially inner side, which is designed for the engagement of an assembly tool, and - an insertion ramp (22).

10. Sealing seat (16) according to claim 9, characterized by the fact that the sealing seat (16) is made of a metallic material. M / Z+J-277-PC 3 11. Sealing seat (16) according to claim 9 or 10, characterized by the fact that the sealing seat (16) has a sealing surface (21) on each of two axially opposite sides.

12. Method for mounting a plate slide (10) by the steps - Inserting a sealing seat (16) into a corresponding geometry of a pipe stub (14); - Mounting at least one guide plate (17) to fix the axial position of the sealing seat (16); and - Assembling a pipe bridge (13) and a plate basket (11) with at least one slide plate (12) arranged therein.

13. Method according to claim 12, characterized by the fact that a sealing element (20) is arranged on a radially inwardly facing side of the pipe stub (14) before the sealing seat (16) is inserted into the corresponding geometry of the pipe stub (14).

14. Method according to claim 12 or 13, characterized by the fact that when inserting the sealing seat (16) the sealing seat (16) is radially centered in the corresponding geometry of the pipe stub (14) by an insertion ramp (22) arranged on the sealing seat (16).

15. Method according to one of the preceding claims, characterized by the fact that when inserting the sealing seat (16) into the corresponding geometry of the pipe stub (14) an assembly tool is used which engages in a groove (19) which is formed on a radially inner side of the sealing seat (16).

Images