Stop valve

Abstract

The utility model relates to the technical field of stop valves, and discloses a stop valve which comprises an outer clack seat in lap joint with the interior of a valve body, a filler core is installed on the outer clack seat, a valve clack is arranged between the outer clack seat and the filler core, a valve rod is arranged in the valve clack in a threaded mode, the top of the valve rod penetrates through the filler core, and the valve rod and the filler core are coaxially and rotatably arranged. The outer edge of the filler core is sleeved with a valve deck in a threaded mode, and the valve deck is arranged on the valve body. And the filler core comprises an outer pressure cover mounted on the outer petal seat. According to the stop valve, the problems that in the prior art, when leakage happens to a stop valve, a valve element is generally replaced, so that only a worn valve clack can be replaced, but a valve seat is arranged in the stop valve and cannot be detached and replaced after being worn, so that the valve seat is in continuous use, and only the whole stop valve can be detached and replaced after the valve seat is worn too much; and the service life of the stop valve is shortened.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a gate valve. Background Technology

[0002] A gate valve is a type of forced-seal valve and one of the most widely used valves. During use, water continuously flows through the valve core assembly. When the valve disc of the valve core assembly is raised to a low height, the gap between the valve disc and the valve seat is small, causing the water flow to exert an erosive force on the contact surface between the valve disc and the valve seat, resulting in wear of the valve core assembly. This affects the valve's sealing performance and service life. Therefore, it is necessary to replace the valve core assembly inside the gate valve regularly.

[0003] During fluid flow, the valve disc and valve seat sealing surfaces of a gate valve come into contact and rub against each other, which leads to wear on the sealing surfaces. In the existing technology, when a gate valve leaks, the valve core is usually replaced. Therefore, only the worn valve disc can be replaced. However, the valve seat itself is located inside the gate valve and cannot be replaced after wear. This causes the valve seat to continue to be used. When the valve seat is worn too much, the entire gate valve must be replaced, which reduces the service life of the gate valve. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a shut-off valve that solves the problems mentioned in the background.

[0005] This utility model provides the following technical solution: a stop valve, comprising: an outer flap seat overlapping inside the valve body, a packing core installed on the outer flap seat, a valve flap disposed between the outer flap seat and the packing core, a valve stem threaded inside the valve flap, and the top of the valve stem passing through the packing core and rotating coaxially with it, a valve cover threaded on the outer edge of the packing core, and the valve cover disposed on the valve body.

[0006] The packing core includes an outer pressure cover mounted on an outer valve seat. The outer pressure cover has water inflow grooves that are open on both the left and right sides. The valve disc is movably disposed inside the outer pressure cover. The top of the outer pressure cover is integrally provided with a screw core section. The top of the screw core section is integrally provided with a limit section. The top of the limit section is integrally provided with an adjusting section.

[0007] A sealing sleeve is threaded onto the core section, and a sealing gasket is clamped between the sealing sleeve and the limiting section. The outer edge of the sealing gasket is clamped between the valve cover and the valve body.

[0008] Preferably, the valve body includes a valve shell, and a valve seat is integrally provided inside the valve shell. A flow groove is provided on the valve seat, and the outer flap seat overlaps inside the flow groove. A connecting core seat is integrally provided on the top of the valve shell, and the connecting core seat is located directly above the flow groove. A sealing bolt is welded to the outer edge of the connecting core seat, and the valve cover is inserted into the sealing bolt.

[0009] Preferably, the valve cover includes a cover shell, and a bolt seat is integrally provided on the outer edge of the bottom of the cover shell. The bolt seat is installed on the valve body by a nut. A limit ring is integrally provided on the top of the cover shell. A limit sleeve is rotatably sleeved on the limit ring. A self-aligning nut is welded on the limit sleeve. The self-aligning nut is threaded onto the self-aligning section.

[0010] Preferably, a limiting groove is provided inside the cover shell, and the limiting segment is slidably and vertically disposed in the limiting groove.

[0011] Preferably, the valve stem includes a rotating rod, which is disposed in the packing core by a mechanical seal. An external threaded block is integrally disposed at the bottom end of the rotating rod, and the external threaded block is threaded in the valve disc. A handwheel is installed at the top of the rotating rod above the packing core.

[0012] Preferably, the valve disc includes a plug block, which is lifted and disposed in the outer pressure cover, and the bottom of the plug block overlaps the outer disc seat. A hexagonal slide rod is integrally disposed on the plug block, and the top of the hexagonal slide rod is provided with an internal thread groove. The top end of the hexagonal slide rod is slidably disposed in a hexagonal groove opened inside the outer pressure cover.

[0013] Preferably, the outer valve seat includes a valve ring, which overlaps in the valve body. A water passage groove is provided in the middle of the valve ring, and the shape of the inner wall of the water passage groove is adapted to the shape of the bottom end of the valve disc. A bolt groove is provided at the bottom of the valve ring near the outer edge, and a long bolt is embedded in the bolt groove. The long bolt is installed on the outer pressure cover.

[0014] Preferably, the top of the petal ring near the outer edge is provided with a positioning groove, and the bottom end of the outer pressure cover is inserted into the positioning groove and installed together with it by a long bolt.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This gate valve, by overlapping an outer disc seat in the valve body and using the valve cover to control the height of the packing core, presses the outer disc seat tightly into the valve body. Then, the valve stem set in the packing core controls the raising and lowering of the valve disc, thereby achieving the effect of controlling the opening and closing of the gate valve. During the opening and closing process, the valve disc only contacts and rubs against the outer disc seat. When wear occurs, the outer disc seat can be replaced together with the valve disc, thus avoiding excessive wear on the valve seat and improving the service life of the gate valve.

[0017] 2. This gate valve, by setting an adjusting section on the packing core, allows the packing core to be lifted and installed in the valve cover after the outer disc seat and valve disc are replaced, using the limiting section. After the sealing gasket is installed on the packing core by the sealing thread sleeve, the structure on the valve cover is rotated so that the valve cover can control the lifting and lowering of the packing core through threaded contact with the adjusting section. After the valve cover is installed on the valve body, the position of the packing core can be controlled by the valve cover to adjust the tightness of the contact between the outer disc seat and the valve seat, thereby improving the sealing performance between the outer disc seat and the valve seat. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the present invention.

[0020] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0021] Figure 4 This is a schematic diagram of the disassembly structure of the packing core and valve body of this utility model;

[0022] Figure 5 This is a schematic diagram of the disassembled structure of the valve cover of this utility model;

[0023] Figure 6 This is a schematic diagram of the valve stem disassembly structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the valve disc mounting structure of this utility model;

[0025] Figure 8 This is a schematic diagram of the disassembly structure of the outer petal seat and the packing core of this utility model.

[0026] In the diagram: 1. Valve body; 11. Valve shell; 12. Valve seat; 13. Flow groove; 14. Connecting core seat; 15. Sealing bolt; 2. Packing core; 21. External pressure cover; 22. Threaded core section; 23. Limiting section; 24. Adjusting section; 25. Water inflow groove; 26. Hexagonal slide groove; 3. Valve stem; 31. Rotating rod; 32. External threaded block; 33. Handwheel; 4. Valve cover; 41. Cover shell; 42. Bolt seat; 43. Limiting ring; 44. Limiting groove; 45. Limiting sleeve; 46. Adjusting nut; 5. Valve disc; 51. Plug; 52. Hexagonal slide rod; 6. Sealing gasket; 7. Sealing threaded sleeve; 8. External disc seat; 81. Disc ring; 82. Bolt groove; 83. Long bolt; 84. Flow groove; 85. Positioning groove. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-8 A shut-off valve includes: an outer flap seat 8 overlapping inside a valve body 1, a packing core 2 installed on the outer flap seat 8, a valve flap 5 disposed between the outer flap seat 8 and the packing core 2, a valve stem 3 being threaded inside the valve flap 5, and the top of the valve stem 3 passing through the packing core 2 and rotating coaxially with it, and a valve cover 4 being threaded on the outer edge of the packing core 2, and the valve cover 4 being disposed on the valve body 1.

[0029] The packing core 2 includes an outer pressure cover 21 installed on the outer valve seat 8. The outer pressure cover 21 has water inflow grooves 25 that are open on the left and right sides. The valve disc 5 is movably installed inside the outer pressure cover 21. The top of the outer pressure cover 21 is integrally provided with a screw core section 22. The top of the screw core section 22 is integrally provided with a limit section 23. The top of the limit section 23 is integrally provided with an adjusting section 24.

[0030] A sealing sleeve 7 is threaded on the core section 22. A sealing gasket 6 is clamped between the sealing sleeve 7 and the limiting section 23. The outer edge of the sealing gasket 6 is clamped between the valve cover 4 and the valve body 1.

[0031] Among them, the packing core 2, valve stem 3, valve disc 5 and outer disc seat 8 are combined to form the valve core assembly of the gate valve.

[0032] The valve body 1 includes a valve shell 11, and a valve seat 12 is integrally provided inside the valve shell 11. A flow groove 13 is provided on the valve seat 12. An outer flap seat 8 overlaps inside the flow groove 13. A connecting core seat 14 is integrally provided on the top of the valve shell 11, and the connecting core seat 14 is located directly above the flow groove 13. A sealing bolt 15 is welded to the outer edge of the connecting core seat 14. The valve cover 4 is inserted into the sealing bolt 15. When installing the valve cover 4, the sealing bolt 15 can be used to directly insert the valve cover 4 into the connecting core seat 14, which is convenient for direct tightening and quick installation of the valve cover 4 on the valve body 1.

[0033] The valve cover 4 includes a cover shell 41. A bolt seat 42 is integrally provided on the outer edge of the bottom of the cover shell 41. The bolt seat 42 is installed on the valve body 1 by a nut. A limit ring 43 is integrally provided on the top of the cover shell 41. A limit sleeve 45 is rotatably sleeved on the limit ring 43. A self-aligning nut 46 is welded on the limit sleeve 45. The self-aligning nut 46 is threaded on the self-aligning section 24. The limit ring 43 restricts the limit sleeve 45 to the cover shell 41, so that the self-aligning nut 46 integrally provided on the limit sleeve 45 can only rotate, avoiding the situation where the self-aligning nut 46 falls off. At the same time, it provides thrust for the packing core 2 to slide up and down.

[0034] The cover 41 has a limiting groove 44 inside, and the limiting section 23 is slidably installed in the limiting groove 44. The shape inside the limiting groove 44 matches the shape of the outer edge of the limiting section 23. When the adjusting nut 46 rotates, the limiting groove 44 provides the limiting section 23 with the limiting ability, so that the adjusting section 24 can only move up and down with the rotation of the adjusting nut 46, thereby achieving the effect of adjusting the height of the packing core 2.

[0035] The valve stem 3 includes a rotating rod 31, which is mechanically sealed within the packing core 2. An external threaded block 32 is integrally formed at the bottom of the rotating rod 31, and the external threaded block 32 is threaded into the valve disc 5. A handwheel 33 is mounted on the top of the rotating rod 31 above the packing core 2. When the handwheel 33 is gripped and rotated, the external threaded block 32 rotates along with the rotating rod 31 and the handwheel 33, thereby controlling the valve disc 5 to rise and fall within the outer pressure cover 21, thus functioning as a shut-off valve.

[0036] The valve disc 5 includes a plug 51, which is lifted and positioned in the outer pressure cover 21. The bottom of the plug 51 overlaps the outer disc seat 8. A hexagonal slide rod 52 is integrally provided on the plug 51. The top of the hexagonal slide rod 52 has an internal threaded groove. The top of the hexagonal slide rod 52 is slidably positioned in a hexagonal groove 26 inside the outer pressure cover 21. The hexagonal groove 26 limits the hexagonal slide rod 52. When the valve stem 3 generates rotational force, the valve disc 5 can only move up and down within the outer pressure cover 21 with the rotation of the valve stem 3. At the same time, the installation of the outer disc seat 8 and the outer pressure cover 21 restricts the valve disc 5 within the outer pressure cover 21, preventing the valve disc 5 from falling into the valve body 1.

[0037] The outer valve seat 8 includes a valve ring 81, which overlaps in the valve body 1. A water passage groove 84 is provided in the middle of the valve ring 81. The shape of the inner wall of the water passage groove 84 is adapted to the shape of the bottom end of the valve disc 5. A bolt groove 82 is provided at the bottom of the valve ring 81 near the outer edge. A long bolt 83 is embedded in the bolt groove 82. The long bolt 83 is installed on the outer pressure cover 21. After the packing core 2 is installed on the valve cover 4, the structure on the valve cover 4 is rotated so that the valve cover 4 can be controlled to rise and fall by contacting the structure thread on the packing core 2. Thus, after the valve cover 4 is installed on the valve body 1, the position of the packing core 2 can be controlled by the valve cover 4 to adjust the tightness of the contact between the outer valve seat 8 and the valve seat 12, thereby improving the sealing performance between the outer valve seat 8 and the valve seat 12.

[0038] The outer petal ring 81 has a positioning groove 85 at its top near the outer edge. The bottom end of the outer pressure cover 21 is inserted into the positioning groove 85 and is installed together with it by a long bolt 83. By opening the positioning groove 85, when installing the outer petal seat 8, the bottom end of the outer pressure cover 21 can be directly inserted into the positioning groove 85, which can automatically align the mounting holes and improve the convenience of installation. At the same time, the bottom end of the outer pressure cover 21 is embedded in the outer petal seat 8, which can further increase the firmness of the installation of the outer petal seat 8 after the outer petal seat 8 is installed, and prevent the outer petal seat 8 from shaking.

[0039] Working principle: When using the gate valve, rotating the valve stem 3 to open and close the gate valve will cause the valve disc 5 to slide up and down in the outer pressure cover 21. Therefore, during long-term use, the valve disc 5 will wear out due to friction contact with the outer disc seat 8. By removing the packing core 2 through the valve cover 4, the outer disc seat 8 and the packing core 2 can be directly removed from the valve body 1, so that all the worn parts of the gate valve can be replaced, thereby improving the sealing effect of the gate valve after the valve core assembly is replaced.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shut-off valve, characterized in that, include: An outer flap seat (8) is attached inside the valve body (1). A packing core (2) is installed on the outer flap seat (8). A valve flap (5) is provided between the outer flap seat (8) and the packing core (2). A valve stem (3) is provided inside the valve flap (5). The top of the valve stem (3) passes through the packing core (2) and is coaxially rotatable with it. A valve cover (4) is threaded on the outer edge of the packing core (2). The valve cover (4) is provided on the valve body (1). The packing core (2) includes an outer pressure cover (21) installed on the outer valve seat (8). The outer pressure cover (21) has water inflow grooves (25) that are open on the left and right sides. The valve disc (5) is movably disposed inside the outer pressure cover (21). The top of the outer pressure cover (21) is integrally provided with a screw core section (22). The top of the screw core section (22) is integrally provided with a limit section (23). The top of the limit section (23) is integrally provided with an adjusting section (24). A sealing sleeve (7) is threaded on the core section (22), and a sealing gasket (6) is clamped between the sealing sleeve (7) and the limiting section (23). The outer edge of the sealing gasket (6) is clamped between the valve cover (4) and the valve body (1).

2. A shut-off valve according to claim 1, characterized in that, The valve body (1) includes a valve shell (11), and a valve seat (12) is integrally provided inside the valve shell (11). A flow groove (13) is provided on the valve seat (12). The outer flap seat (8) overlaps inside the flow groove (13). A core connector (14) is integrally provided on the top of the valve shell (11), and the core connector (14) is located directly above the flow groove (13). A sealing bolt (15) is welded to the outer edge of the core connector (14), and the valve cover (4) is inserted into the sealing bolt (15).

3. A shut-off valve according to claim 1, characterized in that, The valve cover (4) includes a cover shell (41). A bolt seat (42) is integrally provided on the outer edge of the bottom of the cover shell (41). The bolt seat (42) is installed on the valve body (1) by a nut. A limit ring (43) is integrally provided on the top of the cover shell (41). A limit sleeve (45) is rotatably sleeved on the limit ring (43). A self-adjusting nut (46) is welded on the limit sleeve (45). The self-adjusting nut (46) is threaded onto the self-adjusting section (24).

4. A shut-off valve according to claim 3, characterized in that, The cover (41) has a limiting groove (44) inside, and the limiting segment (23) is slidably arranged in the limiting groove (44).

5. A shut-off valve according to claim 1, characterized in that, The valve stem (3) includes a rotating rod (31), which is mechanically sealed in the packing core (2). An external threaded block (32) is integrally provided at the bottom end of the rotating rod (31), and the external threaded block (32) is threaded in the valve disc (5). A handwheel (33) is installed on the top of the rotating rod (31) above the packing core (2).

6. A shut-off valve according to claim 1, characterized in that, The valve disc (5) includes a plug (51), which is lifted and installed in the outer pressure cover (21). The bottom of the plug (51) overlaps the outer disc seat (8). A hexagonal slide rod (52) is integrally provided on the plug (51). The top of the hexagonal slide rod (52) is provided with an internal thread groove. The top of the hexagonal slide rod (52) is slidably installed in the hexagonal groove (26) opened inside the outer pressure cover (21).

7. A shut-off valve according to claim 1, characterized in that, The outer valve seat (8) includes a valve ring (81), which overlaps in the valve body (1). A water passage groove (84) is provided in the middle of the valve ring (81). The shape of the inner wall of the water passage groove (84) is adapted to the shape of the bottom of the valve disc (5). A bolt groove (82) is provided at the bottom of the valve ring (81) near the outer edge. A long bolt (83) is embedded in the bolt groove (82). The long bolt (83) is installed on the outer pressure cover (21).

8. A shut-off valve according to claim 7, characterized in that, The top of the valve ring (81) near the outer edge is provided with a positioning groove (85), and the bottom end of the outer pressure cover (21) is inserted into the positioning groove (85) and installed together with it by a long foot bolt (83).

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