A stop valve

Abstract

The utility model discloses a stop valve, including valve body, valve core and valve rod, the top of valve body is provided with the detachable connection of valve cover, one end of valve rod is connected with valve core, and the other end passes through valve cover and is provided with hand wheel in end portion, valve rod is connected with valve cover thread, the middle part of valve cover has the through slot, be provided with oil tank in the through slot, valve rod passes through oil tank and is connected with its screw thread, the oil tank has the oil storage cavity for oil storage in, the inner wall of through slot has the limiting piece detachable connection with oil tank, through the design of oil tank, the thread section of each area of the surface of valve rod in the lifting process will pass through oil tank and be infiltrated by internal oil, can play good antirust and lubrication effect, even if long -term use valve rod rotation process still can keep good smoothness, thereby ensure the labor -saving of operating hand wheel.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a gate valve. Background Technology

[0002] A gate valve is a type of forced-seal valve. Its core working principle is that the rise and fall of the valve stem drives the valve core to move linearly along the valve seat axis, thereby changing the flow cross-sectional area between the valve core and the valve seat, and realizing the opening, closing, or flow regulation of the medium in the pipeline. It is one of the most widely used valve types in industrial pipelines and civil water supply / heating systems. Its core characteristics are strong sealing performance and stable regulation performance, making it particularly suitable for scenarios that require precise control of medium flow or complete cut-off of the medium.

[0003] During the opening and closing of the gate valve, the valve stem is mainly rotated by the handwheel, which in turn drives the valve core to rise and fall to open and close the valve. However, after long-term use, the threaded section on the valve stem may become rusty, which eventually reduces the smoothness of rotating the valve stem. The frictional resistance increases when turning the handwheel, making it more difficult. Further improvements are needed. Utility Model Content

[0004] To further improve the smoothness of valve stem rotation, this application provides a shut-off valve.

[0005] This application provides a shut-off valve, which adopts the following technical solution: A shut-off valve includes a valve body, a valve core, and a valve stem. The valve body has a valve cover detachably connected to its top. One end of the valve stem is connected to the valve core, and the other end passes through the valve cover and has a handwheel at its end. The valve stem is threadedly connected to the valve cover. The valve cover has a through groove in its middle, and an oil tank is disposed in the through groove. The valve stem passes vertically through the oil tank and is threadedly connected to it. The oil tank has an oil storage cavity for storing oil, and the inner wall of the through groove has a limiting member detachably connected to the oil tank.

[0006] Optionally, the limiting component includes limiting posts symmetrically arranged on both sides of the oil tank. The two sides of the oil tank have limiting holes for the ends of the limiting posts to be inserted into. One end of the limiting post is threaded to the inner wall of the through groove, and the other end is used to be inserted into the limiting hole.

[0007] Optionally, the top of the oil tank is provided with an oil filling port, and the top of the valve cover is provided with an oil filling hole for communicating with the oil filling port.

[0008] Optionally, the bottom wall of the oil tank has recessed grooves on both sides.

[0009] Optionally, the bottom wall of the recessed groove is provided with a chip removal hole, and a first plug is threadedly connected to the chip removal hole.

[0010] Optionally, the connection between the valve cover and the valve stem has a packing cavity, which is filled with packing material. A packing gland is provided on the top of the packing cavity, and the packing gland is fixed to the valve cover by bolts.

[0011] Optionally, the bottom of the oil tank is provided with an oil leakage hole corresponding to the bolt, and a second plug is threadedly connected to the oil leakage hole.

[0012] Optionally, the limiting post has an operating part in the middle, and the operating part is hexagonal prism-shaped and integrally formed with the limiting post.

[0013] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the design of the oil tank, the threaded sections of each area on the surface of the valve stem will pass through the oil tank and be lubricated by the internal oil during the lifting and lowering process. This can play a good role in rust prevention and lubrication. Even after long-term use, the valve stem can still maintain good smoothness during rotation, thus ensuring the effortless operation of the handwheel. 2. The oil tank and valve cover are circumferentially limited by a limiting post. In actual use, the limiting post can also be removed so that the oil tank can rotate and rise and fall with the valve stem. On the one hand, when the oil tank contacts the top wall of the channel, it can play the role of vertical stroke limitation. On the other hand, during the rotation of the oil tank, some particulate impurities inside it will be located in the groove on the outer periphery under the action of centrifugal force, and then discharged through the chip discharge hole, which is convenient for removing particulate impurities in the oil tank. 3. The design of the oil drain hole allows the oil to be drained when the oil tank is rotated so that the oil drain hole aligns with the bolt below, thus lubricating the bolt and effectively preventing rust and ensuring long-term good use of the bolt. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view from the first perspective of an embodiment of this application.

[0015] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0016] Figure 3 This is a cross-sectional view from a second perspective of an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1. Valve body; 2. Valve core; 3. Valve stem; 4. Valve seat; 5. Handwheel; 6. Valve cover; 7. Through groove; 8. Oil tank; 9. Oil reservoir; 10. Limiting post; 11. Limiting hole; 12. Oil inlet; 13. Oil inlet hole; 14. Recessed groove; 15. Chip removal hole; 16. First plug; 17. Operating part; 18. Packing chamber; 19. Packing gland; 20. Bolt; 21. Oil leakage hole; 22. Second plug; 23. Nut. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0019] A type of shut-off valve, such as Figure 1 and Figure 2 As shown, the valve includes a valve body 1, a valve core 2, and a valve stem 3. The valve body 1 has an inlet and an outlet at both ends. A valve seat 4 is installed inside the valve body 1, and the valve seat 4 has a communication port. The valve core 2 is used to block the communication port of the valve seat 4. The valve stem 3 is vertically arranged, with one end connected to the valve core 2 and the other end connected to a handwheel 5. A valve cover 6 is detachably connected to the top of the valve body 1. The valve cover 6 can be fixed to the valve body 1 by screws. The valve stem 3 passes through the valve cover 6 and is threadedly connected to it. In this way, by rotating the handwheel 5, the valve stem 3 is driven to rotate, thereby raising and lowering the valve, which in turn drives the valve core 2 to rise and fall, ultimately realizing the opening and closing of the valve.

[0020] like Figure 1 and Figure 2 As shown, the valve cover 6 has a horizontal through groove 7 in the middle, and an oil tank 8 is provided in the through groove 7, which is sleeved on the valve stem 3 and threadedly connected to it. The oil tank 8 has an oil storage chamber 9 for storing oil. At the same time, a limiting member is provided between the oil tank 8 and the inner wall of the through groove 7 of the valve cover 6 to connect the two. The limiting member is used to restrict the oil tank 8 from rotating with the valve stem 3.

[0021] In this way, during the lifting and lowering of the valve stem 3, the threaded sections on each area of ​​its surface will pass through the oil tank 8 and be lubricated by the internal oil, which can play a good role in rust prevention and lubrication. Even after long-term use, the valve stem 3 can still maintain good smoothness during rotation, thus ensuring the effortless operation of the handwheel 5.

[0022] like Figure 1 and Figure 2 As shown, the limiting component includes a limiting post 10, which is symmetrically arranged on both sides of the oil tank 8. One end of the limiting post 10 is threaded to the inner wall of the through groove 7, and the other end is used to insert into the limiting hole 11 of the oil tank 8. The limiting post 10 and the limiting hole 11 cooperate to limit the rotation of the oil tank 8. After the limiting post 10 is rotated and its end is dislodged from the limiting hole 11, the limiting of the oil tank 8 can be released. The oil tank 8 can rotate and rise and fall with the valve stem 3. In this way, when the oil tank 8 rises and contacts the top wall of the through groove 7, it can play a certain role in limiting the stroke. In addition, as the oil tank 8 rotates, some particulate impurities inside can be thrown to the outer periphery under the action of centrifugal force, which is convenient for cleaning and ensures that there are fewer particulate impurities in the middle of the oil tank 8, reducing the impact of particulate impurities on the rotation of the valve stem 3.

[0023] like Figure 1 and Figure 2As shown, an oil inlet 12 communicating with the oil storage chamber 9 is provided on the top of the oil tank 8, and an oil filling hole 13 communicating with the oil inlet 12 is provided on the top of the valve cover 6. When the oil tank 8 rises to the limit position with the valve rod 3 and abuts against the top wall of the through groove 7, the oil inlet 12 and the oil filling hole 13 correspond and communicate. Oil can be added to the oil tank 8 simply by adding oil into the oil filling hole 13, which improves the convenience of oil replenishment and avoids the situation where the oil inlet 12 is located inside the through groove 7 and is difficult to operate.

[0024] like Figure 1 and Figure 2 As shown, the inner bottom wall of the oil tank 8 has a recessed groove 14 on its outer periphery. The bottom wall of the recessed groove 14 is provided with a chip discharge hole 15, and a first plug 16 is threadedly connected to the chip discharge hole 15. The recessed groove 14 can store particulate impurities. As the oil tank 8 rotates, the particulate impurities inside will be located on the outer periphery under the action of centrifugal force and fall into the recessed groove 14. When cleaning is required, the particulate impurities in the recessed groove 14 can be discharged simply by removing the first plug 16, which effectively improves the convenience of cleaning particulate impurities.

[0025] like Figure 2 As shown, an operating part 17 integrally formed with the limiting post 10 is provided in the middle of the limiting post 10. The operating part 17 is hexagonal prism in shape. The design of the operating part 17 makes it easy to rotate the limiting post 10 by hand, reducing the phenomenon that the limiting post 10 is difficult to rotate due to slippage.

[0026] like Figure 3 As shown, the connection between the valve cover 6 and the valve stem 3 has a packing cavity 18, which is filled with packing. A packing gland 19 is provided on the top of the packing cavity 18. The packing gland 19 is used to tighten the packing to ensure the sealing of the connection. The packing gland 19 is fixed by a threaded connection. An oil leakage hole 21 corresponding to the bolt 20 is provided at the bottom of the oil tank 8. A removable second plug 22 is threadedly connected to the oil leakage hole 21. In this way, the oil leakage through the oil leakage hole 21 can lubricate the bolt 20 below, effectively preventing the threaded section on the bolt 20 from being difficult to rotate and connect the nut 23 due to rust. Simply rotate the oil tank 8 until the oil leakage hole 21 is above the bolt 20, open the second plug 22 to achieve oil leakage and lubricate the bolt 20 and nut 23 below.

[0027] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A shut-off valve, characterized in that: The valve includes a valve body (1), a valve core (2), and a valve stem (3). The top of the valve body (1) is provided with a valve cover (6) that is detachably connected to it. One end of the valve stem (3) is connected to the valve core (2), and the other end passes through the valve cover (6) and is provided with a handwheel (5). The valve stem (3) is threadedly connected to the valve cover (6). The valve cover (6) has a through groove (7) in the middle. An oil tank (8) is provided in the through groove (7). The valve stem (3) passes vertically through the oil tank (8) and is threadedly connected to it. The oil tank (8) has an oil storage chamber (9) for storing oil. The inner wall of the through groove (7) has a limiting member that is detachably connected to the oil tank (8).

2. A shut-off valve according to claim 1, characterized in that: The limiting component includes a limiting post (10) and is symmetrically arranged on both sides of the oil tank (8). The oil tank (8) has limiting holes (11) on both sides for the end of the limiting post (10) to be inserted. One end of the limiting post (10) is threaded to the inner wall of the through groove (7), and the other end is used to be inserted into the limiting hole (11).

3. A shut-off valve according to claim 2, characterized in that: The top of the oil tank (8) is provided with an oil inlet (12), and the top of the valve cover (6) is provided with an oil inlet (13) for communicating with the oil inlet (12).

4. A shut-off valve according to claim 2, characterized in that: The bottom wall of the oil tank (8) has recessed grooves (14) on both sides.

5. A shut-off valve according to claim 4, characterized in that: The bottom wall of the recessed groove (14) is provided with a chip removal hole (15), and a first plug (16) is threadedly connected to the chip removal hole (15).

6. A shut-off valve according to claim 1, characterized in that: The valve cover (6) and valve stem (3) are connected by a packing cavity (18), which is filled with packing material. A packing gland (19) is provided on the top of the packing cavity (18), and the packing gland (19) is connected and fixed to the valve cover (6) by bolts (20).

7. A shut-off valve according to claim 6, characterized in that: The bottom of the oil tank (8) is provided with an oil leakage hole (21) corresponding to the bolt (20), and a second plug (22) is threadedly connected to the oil leakage hole (21).

8. A shut-off valve according to claim 2, characterized in that: The limiting post (10) has an operating part (17) in the middle, and the operating part (17) is hexagonal prism and is integrally formed with the limiting post (10).

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