Stop valve with long service life

Abstract

The stop valve with the long service life comprises a valve body, a valve cover, a valve rod, a valve clack and a valve seat, the valve body is provided with an inlet flow channel and an outlet flow channel, a flow passing opening is formed in the valve body, the valve cover is installed on the upper portion of the valve body, the valve rod penetrates through the valve cover and extends into the valve body to be in linkage connection with the valve clack, and the valve seat is arranged on the flow passing opening. The valve seat comprises a valve seat ring, a supporting ring and a plurality of locking screws, the valve seat ring penetrates through the overflowing opening, a limiting flange is arranged at the upper end of the valve seat ring and abuts against the position, corresponding to the upper end of the overflowing opening, of the inner wall of the valve body, a threaded section is arranged on the periphery of the lower end of the valve seat ring, and the supporting ring is in threaded connection with the threaded section. The supporting ring is provided with a plurality of screw holes with the number equal to that of the locking screws, the locking screws are screwed into the corresponding screw holes from bottom to top, and the upper ends of the locking screws abut against the positions, corresponding to the lower end of the overflowing opening, of the inner wall of the valve body. The valve seat is easy and convenient to replace, the inner wall of the valve body cannot be damaged in the replacement process, and the service life of the valve can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a stop valve with a long service life. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve and one of the most widely used valves. It is popular because the friction between the sealing surfaces during opening and closing is small, it is relatively durable, the opening height is not large, it is easy to manufacture and maintain, and it is suitable not only for medium and low pressures, but also for high pressures.

[0003] Existing valves usually include a valve body, a valve cover, a valve stem, a valve disc and a valve seat. The valve cover is arranged on the upper part of the valve body. The valve stem passes through the valve cover and is linked to the valve disc arranged inside the valve body. The valve stem is driven by an external actuator to drive the valve stem to move the valve disc up and down. The valve seat is arranged in the valve body. When the valve disc is against the valve seat, the valve is closed. When the valve disc is separated from the valve seat, the valve is opened.

[0004] However, the valve seat is a consumable part. In the existing valve structure, the valve seat is installed in either an integrated structure with the valve body, welded in the valve body, or threaded in the valve body. In the case where the valve body and the valve seat are an integrated structure, the valve body needs to be replaced after the valve seat part is worn. The valve seat is welded inside the valve body, which is very difficult to disassemble, and basically the entire valve body needs to be replaced. The valve seat is installed in the valve body by threaded connection, and the valve body needs to be designed with an internal thread for matching with the valve seat. Not only is it difficult to process, but after multiple replacements, the internal thread is also easily damaged, resulting in the valve body being unusable and requiring the entire valve body to be replaced. For the above reasons, the existing stop valve has the defect of a short service life. Utility Model Content

[0005] The utility model aims to provide a stop valve with a long service life. The utility model is simple and convenient to replace the valve seat, and the inner wall of the valve body will not be damaged during the replacement process, so the service life of the valve can be effectively improved.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stop valve with a long service life, comprising a valve body, a valve cover, a valve stem, a valve disc and a valve seat, the valve body is provided with an inlet flow channel and an outlet flow channel which are interconnected, a flow port is provided in the valve body at a position corresponding to the inlet flow channel and the outlet flow channel, the valve cover is mounted on the upper part of the valve body, the valve stem penetrates the valve cover and extends into the interior of the valve body to be linked with the valve disc, and the valve seat is arranged on the flow port; the valve seat comprises a valve seat ring, a support ring and a plurality of locking rings Screws, the valve seat ring passes through the flow port, the upper end of the valve seat ring is provided with a limiting flange extending toward the periphery, the limiting flange abuts against the position of the upper end of the flow port on the inner wall of the valve body corresponding to the upper end of the flow port, the outer periphery of the lower end of the valve seat ring is provided with a threaded section, the support ring is threadedly connected to the threaded section, and a plurality of screw holes corresponding to the locking screws are opened on the support ring along the circumferential direction, the locking screws are screwed into the corresponding screw holes from bottom to top, and the upper end of the locking screw abuts against the position of the lower end of the flow port on the inner wall of the valve body corresponding to the lower end of the flow port.

[0007] By adopting the above technical solution, when installing the valve seat, first pass the valve seat ring through the flow port, the limiting flange on the valve seat ring abuts against the upper end of the flow port, the support ring is threadedly connected to the valve seat ring, and the locking screw on the support ring is tightened so that the locking screw abuts against the lower end of the flow port to achieve the installation of the valve seat ring; when the valve seat ring is worn and needs to be replaced, it is only necessary to unscrew the locking screw and the support ring in turn, and then take out the valve seat ring for replacement. The operation is very convenient, and there is no need to set threads on the inner wall of the valve body. The inner wall of the valve body will not be damaged during the replacement process, which can effectively improve the service life of the valve.

[0008] The utility model is further configured that an annular groove is provided on the inner wall of the valve body corresponding to the upper end of the flow port, and a sealing gasket for tightly fitting with the limiting flange is embedded in the annular groove.

[0009] By adopting the above technical solution, when the valve seat ring is subjected to a downward pre-tightening force, the limiting flange on the valve seat ring presses the sealing gasket in the annular groove, thereby ensuring the sealing between the valve seat ring and the flow port, and preventing the medium from leaking from the gap between the two when the valve is closed.

[0010] The utility model is further configured such that a gasket is sandwiched between the upper end of the locking screw and the inner wall of the valve body.

[0011] By adopting the above technical solution and arranging a gasket, it is possible to prevent the locking screw from damaging the inner wall of the valve body when tightening the locking screw, thereby protecting the valve body.

[0012] The utility model is further configured such that the upper end of the gasket is provided with a plurality of first positioning protrusions distributed in a circular array, the inner wall of the valve body is provided with a plurality of first positioning grooves matching the first positioning protrusions, and the lower end of the gasket is also provided with a plurality of second positioning grooves for inserting the upper end of the locking screw.

[0013] By adopting the above technical solution, the stability of the entire valve seat structure can be ensured, and after tightening the locking screw, the positioning structure prevents the valve seat ring from rotating due to external force.

[0014] The utility model is further configured to include a sleeve, which is detachably mounted on the lower end of the valve seat ring, and an annular closed cavity is formed between the sleeve, the valve seat ring and the inner wall of the valve body, and the support ring, locking screw and gasket are arranged in the closed cavity.

[0015] By adopting the above technical solution, the sleeve can cover the support ring, locking screws and washers inside the closed cavity, preventing the flow of medium from affecting the stability of the installation of the support ring, locking screws and washers, and preventing the loosening of components.

[0016] The utility model is further configured as follows: the sleeve includes an outer ring and a connecting ring arranged at the lower end of the outer ring and extending inward, the connecting ring is threadedly matched with the threaded section, and the connecting ring is provided with a sealing flange that abuts against the lower end of the valve seat ring, the upper end of the sealing flange is provided with a first annular sealing groove, a first sealing ring for sealingly matching with the outer periphery of the valve seat ring is embedded in the first annular sealing groove, the upper end of the outer ring is tightly abutted against the inner wall of the valve body, and the upper end of the outer ring is provided with a second annular sealing groove, a second sealing ring for sealingly matching with the inner wall of the valve body is embedded in the second annular sealing groove.

[0017] By adopting the above technical solution, the sealing property of the sealed cavity can be ensured, and external media can be prevented from entering the sealed cavity.

[0018] The utility model is further configured that the locking screw is a hexagon socket screw.

[0019] By adopting the above technical solution, it is convenient to perform the rotation operation in the narrow space inside the valve body.

[0020] The utility model is further configured such that a thread groove is provided at the upper end of the valve disc, the lower end of the valve stem is threadedly matched with the thread groove on the valve disc, and a buffer block is provided at the inner end of the thread groove, and the lower end of the valve stem is tightly pressed against the buffer block.

[0021] By adopting the above technical solution, the connection structure is simple and reliable, and disassembly and assembly are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0024] In the figure: 1. valve body; 2. valve cover; 3. valve stem; 4. valve disc; 5. valve seat; 6. inlet flow channel; 7. outlet flow channel; 8. flow port; 9. valve seat ring; 10. support ring; 11. locking screw; 12. limiting flange; 13. threaded section; 14. screw hole; 15. annular groove; 16. sealing gasket; 17. washer; 18. first positioning protrusion; 19. first positioning groove; 20. second positioning groove; 21. sleeve; 22. closed cavity; 23. outer ring; 24. connecting ring; 25. sealing flange; 26. first annular sealing groove; 27. first sealing ring; 28. second annular sealing groove; 29. ​​second sealing ring; 30. threaded groove; 31. buffer block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example: As shown in the attached Figure 1 and attached Figure 2A stop valve with a long service life is shown, comprising a valve body 1, a valve cover 2, a valve stem 3, a valve disc 4 and a valve seat 5. The valve body 1 is provided with an inlet flow channel 6 and an outlet flow channel 7 which are interconnected. A flow port 8 is provided in the valve body 1 at a position corresponding to between the inlet flow channel 6 and the outlet flow channel 7. The valve cover 2 is mounted on the upper part of the valve body 1. The valve stem 3 penetrates through the valve cover 2 and extends into the interior of the valve body 1 to be linked with the valve disc 4. The valve seat 5 is arranged on the flow port 8. The valve seat 5 comprises a valve seat ring 9, a support ring 10 and a plurality of locking screws 11. The valve seat ring 9 penetrates through the flow port 8. The upper end of the valve seat ring 9 is provided with a limiting flange 12 extending toward the periphery, and the limiting flange 12 abuts against the position of the inner wall of the valve body 1 corresponding to the upper end of the flow port 8, and the outer periphery of the lower end of the valve seat ring 9 is provided with a threaded section 13 (external thread), and the support ring 10 (with internal thread) is threadedly connected to the threaded section 13, and a plurality of screw holes 14 corresponding to the number of the locking screws 11 are opened circumferentially on the support ring 10, and the locking screws 11 are screwed into the corresponding screw holes 14 from bottom to top, and the upper end of the locking screw 11 abuts against the position of the inner wall of the valve body 1 corresponding to the lower end of the flow port 8. When installing the valve seat 5, first pass the valve seat ring 9 through the flow port 8, and the limiting flange 12 on the valve seat ring 9 rests on the upper end of the flow port 8. The support ring 10 is threadedly connected to the valve seat ring 9, and the locking screw 11 on the support ring 10 is tightened so that the locking screw 11 rests on the lower end of the flow port 8. The locking screw 11 and the limiting flange 12 clamp the upper and lower ends of the flow port 8 to achieve the installation of the valve seat ring 9; when the valve seat ring 9 is worn and needs to be replaced, it is only necessary to unscrew the locking screw 11 and the support ring 10 in turn, and then take out the valve seat ring 9 for replacement. The operation is very convenient, and there is no need to set threads on the inner wall of the valve body 1. The inner wall of the valve body 1 will not be damaged during the replacement process, which can effectively improve the service life of the valve.

[0027] As attached Figure 2 As shown, an annular groove 15 is provided at a position on the inner wall of the valve body 1 corresponding to the upper end of the flow port 8, and a sealing gasket 16 for tightly fitting with the limiting flange 12 is embedded in the annular groove 15. When the valve seat ring 9 is subjected to a downward preload, the limiting flange 12 on the valve seat ring 9 presses the sealing gasket 16 in the annular groove 15, thereby ensuring the sealing between the valve seat ring 9 and the flow port 8, and preventing the medium from leaking from the gap between the two when the valve is closed.

[0028] As attached Figure 2 As shown, a washer 17 is sandwiched between the upper end of the locking screw 11 and the inner wall of the valve body 1. The washer 17 can be made of metal. The washer 17 can prevent the locking screw 11 from damaging the inner wall of the valve body 1 when tightening the locking screw 11, thereby protecting the valve body 1.

[0029] As attached Figure 2As shown, the upper end of the gasket 17 is provided with a plurality of first positioning protrusions 18 distributed in a circumferential array, the inner wall of the valve body 1 is provided with a plurality of first positioning grooves 19 matched with the first positioning protrusions 18, and the lower end of the gasket 17 is also provided with a plurality of second positioning grooves 20 for inserting the upper end of the locking screw 11, and the cross-sections of the first positioning protrusion 18, the first positioning groove 19, the second positioning protrusion and the second positioning groove 20 are all circular. This design can ensure the stability of the entire valve seat 5 structure. After tightening the locking screw 11, the positioning structure prevents the valve seat ring 9 from rotating due to external force.

[0030] As attached Figure 2 As shown, it also includes a sheath 21, which is detachably mounted on the lower end of the valve seat ring 9, and an annular closed cavity 22 is formed between the sheath 21, the valve seat ring 9 and the inner wall of the valve body 1, and the support ring 10, the locking screw 11 and the gasket 17 are arranged in the closed cavity 22. The sheath 21 can cover the support ring 10, the locking screw 11 and the gasket 17 inside the closed cavity 22, so as to prevent the medium flow from affecting the stability of the installation of the support ring 10, the locking screw 11 and the gasket 17, and prevent the loosening of parts.

[0031] As attached Figure 2 As shown, the sleeve 21 includes an outer ring 23 and a connecting ring 24 arranged at the lower end of the outer ring 23 and extending inward, the connecting ring 24 has an internal thread, the connecting ring 24 is threadedly matched with the threaded section 13, and the connecting ring 24 is provided with a sealing flange 25 that abuts against the lower end of the valve seat ring 9, the upper end of the sealing flange 25 is provided with a first annular sealing groove 26, and the first annular sealing groove 26 is embedded with a first sealing ring 27 for forming a sealing match with the outer periphery of the valve seat ring 9, the upper end of the outer ring 23 is tightly abutted against the inner wall of the valve body 1, and the upper end of the outer ring 23 is provided with a second annular sealing groove 28, and the second annular sealing groove 28 is embedded with a second sealing ring 29 for forming a sealing match with the inner wall of the valve body 1. This design can ensure the closedness of the closed cavity 22 and prevent external media from entering the closed cavity 22.

[0032] The locking screw 11 is a hexagon socket screw, which is convenient for rotating in the narrow space inside the valve body 1 .

[0033] As attached Figure 1 As shown, the upper end of the valve flap 4 is provided with a thread groove 30, the lower end of the valve stem 3 is threadedly matched with the thread groove 30 on the valve flap 4, and the inner end of the thread groove 30 is provided with a buffer block 31, and the lower end of the valve stem 3 is tightly pressed against the buffer block 31. The connection structure of this design is simple and reliable, and it is very convenient to disassemble and assemble.

Claims

1. A stop valve with a long service life, comprising a valve body (1), a valve cover (2), a valve stem (3), a valve disc (4) and a valve seat (5), wherein the valve body (1) is provided with an inlet flow channel (6) and an outlet flow channel (7) which are interconnected, a flow port (8) is provided in the valve body (1) at a position corresponding to between the inlet flow channel (6) and the outlet flow channel (7), the valve cover (2) is mounted on the upper part of the valve body (1), the valve stem (3) penetrates the valve cover (2) and extends into the interior of the valve body (1) to be linked with the valve disc (4), and the valve seat (5) is arranged on the flow port (8); characterized in that: The valve seat (5) comprises a valve seat ring (9), a support ring (10) (10) and a plurality of locking screws (11); the valve seat ring (9) passes through the flow port (8); the upper end of the valve seat ring (9) is provided with a limiting flange (12) extending toward the periphery; the limiting flange (12) abuts against the position of the inner wall of the valve body (1) corresponding to the upper end of the flow port (8); the outer periphery of the lower end of the valve seat ring (9) is provided with a threaded section (13); the support ring (10) is threadedly connected to the threaded section (13); a plurality of screw holes (14) corresponding to the number of the locking screws (11) are opened circumferentially on the support ring (10); the locking screws (11) are screwed into the corresponding screw holes (14) from bottom to top, and the upper end of the locking screw (11) abuts against the position of the inner wall of the valve body (1) corresponding to the lower end of the flow port (8).

2. A stop valve with a long service life according to claim 1, characterized in that: An annular groove (15) is provided on the inner wall of the valve body (1) at a position corresponding to the upper end of the flow port (8), and a sealing gasket (16) for tightly fitting with the limiting flange (12) is embedded in the annular groove (15).

3. A stop valve with a long service life according to claim 1, characterized in that: A washer (17) is sandwiched between the upper end of the locking screw (11) and the inner wall of the valve body (1).

4. A stop valve with a long service life according to claim 3, characterized in that: The upper end of the gasket (17) is provided with a plurality of first positioning protrusions (18) distributed in a circumferential array, the inner wall of the valve body (1) is provided with a plurality of first positioning grooves (19) matching with the first positioning protrusions (18), and the lower end of the gasket (17) is also provided with a plurality of second positioning grooves (20) for inserting the upper end of the locking screw (11).

5. A stop valve with a long service life according to claim 3, characterized in that: It also includes a sleeve (21) which is detachably mounted on the lower end of the valve seat ring (9), and an annular closed cavity (22) is formed between the sleeve (21), the valve seat ring (9) and the inner wall of the valve body (1), and the support ring (10) (10), the locking screw (11) and the gasket (17) are arranged in the closed cavity (22).

6. A stop valve with a long service life according to claim 5, characterized in that: The sleeve (21) comprises an outer ring (23) and a connecting ring (24) which is arranged at the lower end of the outer ring (23) and extends inwardly, the connecting ring (24) is threadedly matched with the threaded section (13), and the connecting ring (24) is provided with a sealing flange (25) which abuts against the lower end of the valve seat ring (9), the upper end of the sealing flange (25) is provided with a first annular sealing groove (26), and the first annular sealing groove (26) is embedded with a first sealing ring (27) for forming a sealing match with the outer periphery of the valve seat ring (9), the upper end of the outer ring (23) is tightly abutted against the inner wall of the valve body (1), and the upper end of the outer ring (23) is provided with a second annular sealing groove (28), and the second annular sealing groove (28) is embedded with a second sealing ring (29) for forming a sealing match with the inner wall of the valve body (1).

7. A stop valve with a long service life according to claim 1, characterized in that: The locking screw (11) is a hexagon socket screw.

8. A stop valve with a long service life according to claim 1, characterized in that: The upper end of the valve flap (4) is provided with a thread groove (30), the lower end of the valve stem (3) is threadably matched with the thread groove (30) on the valve flap (4), and a buffer block (31) is provided at the inner end of the thread groove (30), and the lower end of the valve stem (3) is tightly abutted against the buffer block (31).

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