Online cleaning type stop valve

Abstract

The utility model discloses an on-line cleaning type stop valve which comprises a valve body, a valve rod screwed on the valve body through a valve cover, a valve disc installed at the lower end of the valve rod and a valve seat installed on the valve body and matched with a sealing face at the lower end of the valve disc. The cleaning guide rod can move in the valve rod in the axial direction and can rotate, and the cleaning guide rod is connected with the valve disc after moving downwards. A cleaning medium hole is formed in the cleaning guide rod in the axial direction, the upper end of the cleaning medium hole can be communicated with the medium connector, the lower end of the cleaning medium hole can be communicated with a cleaning medium outlet in the valve disc after the cleaning guide rod moves downwards, and the cleaning medium outlet faces the sealing face of the valve seat. According to the on-line cleaning type stop valve, on-line cleaning can be carried out on the sealing face of the stop valve under the condition that the stop valve or the valve cover is not disassembled.

Description

Technical Field

[0001] This utility model relates to a valve, and more particularly to a shut-off valve that requires cleaning and maintenance. Background Technology

[0002] A gate valve achieves its function of shutting off the flow of liquid in a pipeline by applying torque to the valve stem, which in turn applies pressure axially to the valve disc. This pressure causes the valve disc sealing surface to fit tightly against the valve seat sealing surface, preventing leakage of liquid through the gaps between the sealing surfaces. Gate valves are widely used in industries such as shipbuilding, wastewater treatment, and chemicals. However, after a period of use, sealing problems may occur, especially when the liquid in the pipeline contains a lot of impurities. Impurities, oil, and particles in the liquid can adhere to the sealing surfaces of the valve disc and valve seat, preventing them from fitting tightly together. To maintain the function of the gate valve, it is necessary to clean it regularly or as needed in such applications. Cleaning requires removing the gate valve from the pipeline or removing the valve cover from the valve body so that the valve disc and seat can be accessed for cleaning. This process is labor-intensive and requires stopping the use of that section of pipeline, i.e., shutting down for maintenance. However, on ships at sea, the function of the pipeline cannot be easily stopped. If the gate valve cannot reliably close the pipeline it is connected to, the use of that pipeline must be stopped for maintenance, which will inevitably affect the normal navigation of the ship and cause many problems. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide an online cleaning type shut-off valve, which can clean the sealing surface of the shut-off valve online without disassembling the shut-off valve or its valve cover.

[0004] To solve the above-mentioned technical problems, this utility model provides an online cleaning shut-off valve, including a valve body, a valve stem screwed onto the valve body via a valve cover, a valve disc installed at the lower end of the valve stem, and a valve seat installed on the valve body that matches the sealing surface of the lower end of the valve disc. A cleaning guide rod is sealed and inserted in the valve stem. The cleaning guide rod can be axially moved and rotated within the valve stem. After the cleaning guide rod is moved downward, it connects to the valve disc. A cleaning medium hole is provided axially within the cleaning guide rod. The upper end of the cleaning medium hole can communicate with a medium connector. After the cleaning guide rod is moved downward, the lower end of the cleaning medium hole can communicate with a cleaning medium outlet on the valve disc. The cleaning medium outlet faces the sealing surface of the valve seat.

[0005] In the above structure, a cleaning guide rod is sealed and inserted in the valve stem. This cleaning guide rod can move axially and rotate within the valve stem. After the cleaning guide rod moves downward, it connects to the valve disc. Thus, when valve cleaning is required, the cleaning guide rod, which can move up and down inside the valve stem, will move downward, connecting the cleaning guide rod to the valve disc. Rotating the cleaning guide rod will cause the valve disc to rotate together. At this time, the sealing surface of the valve disc is in a position close to or slightly in contact with the sealing surface of the valve seat. Rotating the cleaning guide rod will cause the valve disc and the valve seat to rotate relative to each other, which can loosen the debris and particles adhering to the sealing surfaces of the valve disc and the valve seat through the rotation and friction of the valve disc, thereby detaching them from the adhered sealing surfaces and achieving the corresponding cleaning effect.

[0006] Furthermore, since a cleaning medium hole is provided axially inside the cleaning guide rod, the upper end of the cleaning medium hole can be connected to the medium connector, and after the cleaning guide rod moves downward, the lower end of the cleaning medium hole can be connected to the cleaning medium outlet on the valve disc. The cleaning medium outlet faces the sealing surface of the valve seat, so the cleaning medium can enter the cleaning medium hole from the medium connector, and after the cleaning guide rod moves downward, it passes through the cleaning medium hole to the cleaning medium outlet on the valve disc, and then is shot from the cleaning medium outlet towards the sealing surface of the valve seat with a certain pressure. At this time, the valve disc is in a position close to the valve seat with a certain gap. The cleaning medium ejected from the cleaning medium outlet will have a good flushing effect on the sealing surfaces of the valve disc and the valve seat, peeling off the dirt and particles adhering to them. During the flushing process, the cleaning guide rod drives the valve disc to rotate, and the circumferential position of the cleaning medium outlet on the valve disc will rotate accordingly, so that the sealing surfaces of the entire valve disc and the valve seat can be completely cleaned.

[0007] The above-mentioned valve disc rotation friction cleaning and cleaning medium flushing cleaning process can be achieved simply by driving the cleaning guide rod to move axially and rotate. The entire cleaning process is carried out online, without disassembling the valve or valve cover, and without stopping the use of the pipeline where the valve is located. Moreover, the cleaning process is convenient and quick, with little workload and low labor intensity.

[0008] In a preferred embodiment of this invention, the lower end of the cleaning guide rod extends beyond the lower end of the valve stem and inserts into the valve disc. A connecting tenon is provided on the lower end face of the cleaning guide rod, and a corresponding connecting tenon groove is provided on the inner surface of the valve disc. After the cleaning guide rod is moved downward, it is connected to the valve disc through the connecting tenon and the connecting tenon groove. With this embodiment, the cleaning guide rod and the valve disc have a defined positional relationship, ensuring reliable vertical movement of the cleaning guide rod. The connecting tenon and connecting tenon groove facilitate easy connection and disconnection between the cleaning guide rod and the valve disc through vertical movement.

[0009] In another preferred embodiment of this utility model, the connecting tenon groove is provided on the upper end face of the valve disc plug, and the valve disc plug is screwed onto the valve disc from the bottom. This embodiment facilitates the manufacturing and processing of the valve disc and the connecting tenon groove.

[0010] In another preferred embodiment of this utility model, a positioning bead is installed on the valve stem, and two positioning grooves corresponding to the positioning bead are provided on the outer periphery of the cleaning guide rod. The distance between the two positioning grooves corresponds to the distance required for the vertical movement of the cleaning guide rod. With this embodiment, the vertical movement of the cleaning guide rod has a definite position, making it convenient to use.

[0011] In a further preferred embodiment of this invention, a drive handle is provided at the upper end of the cleaning guide rod. With this embodiment, the cleaning guide rod can move up and down and rotate via the drive handle, providing convenient control.

[0012] In another preferred embodiment of this invention, the cleaning medium hole is closed at both ends, and radial holes communicating with the cleaning medium hole are provided at both ends of the cleaning guide rod. With this embodiment, the closed cleaning medium hole ensures that the cleaning medium will not leak out during use, and the radial holes facilitate the control of the connection between the cleaning medium hole and the corresponding medium connector and cleaning medium outlet when the cleaning guide rod moves up and down.

[0013] In another preferred embodiment of this utility model, the media connector is disposed on the outer circumferential surface of the extended end of the valve stem. After the cleaning guide rod is moved downward, the radial hole at its upper end communicates with the media connector on the valve stem. After the cleaning guide rod is moved upward, the radial hole at its upper end is located between the two sealing rings installed between the cleaning guide rod and the valve stem. This embodiment ensures that the radial hole at the upper end of the cleaning guide rod communicates with the media connector when the cleaning guide rod is moved downward, and that the radial hole is sealed and isolated by the two sealing rings when the cleaning guide rod is moved upward and in a non-cleaning state, preventing liquid in the pipeline flowing through the shut-off valve from leaking out through the cleaning media hole.

[0014] In a further preferred embodiment of this invention, the radial hole at the lower end of the cleaning guide rod is located above the connecting tenon. After the cleaning guide rod is moved downward, the radial hole at the lower end is located in the medium ring cavity within the valve disc and communicates with the cleaning medium outlet on the valve disc through a connecting hole. After the cleaning guide rod is moved upward, the radial hole at the lower end is located on the upper side of the sealing ring installed between the cleaning guide rod and the valve disc. This embodiment ensures that the cleaning medium in the cleaning medium hole flows to the cleaning medium outlet after the cleaning guide rod is moved downward. The medium ring cavity ensures that the cleaning medium flowing out of the radial hole flows to multiple cleaning medium outlets. When the cleaning guide rod is moved upward and in a non-cleaning state, the radial hole is located above the sealing ring. The sealing ring seals and isolates the radial hole from the medium ring cavity, preventing liquid in the pipeline flowing through the shut-off valve from entering the cleaning medium hole through the cleaning medium outlet and the medium ring cavity, and preventing leakage through the cleaning medium hole.

[0015] In another further preferred embodiment of this invention, the media connector is connected to a pressure cleaning media source. With this embodiment, the cleaning media ejected from the cleaning media outlet is supplied by the pressure cleaning media source, ensuring the working pressure of the cleaning media during cleaning operations and resulting in excellent cleaning performance.

[0016] In another preferred embodiment of this invention, the pressure cleaning medium source is a compressed air source or a fluid pump. In this embodiment, the cleaning medium is compressed air or water or cleaning fluid with a certain pressure, both of which ensure effective flushing and cleaning. Attached Figure Description

[0017] The online cleaning shut-off valve of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of a specific embodiment of the online cleaning shut-off valve of this utility model;

[0019] Figure 2 yes Figure 1 A magnified view of part I in the structure shown;

[0020] Figure 3 yes Figure 1 A magnified view of part II in the structure shown;

[0021] Figure 4 yes Figure 2 The diagram shows the structure in the cleaning working state when the cleaning guide rod is moved downwards;

[0022] Figure 5 yes Figure 3 The diagram shows the structure in the cleaning working state when the cleaning guide rod is moved downwards;

[0023] Figure 6 yes Figure 1 The top view of the valve disc plug in the structure shown.

[0024] In the diagram: 1-valve body, 2-valve seat, 3-cleaning medium outlet, 4-connecting hole, 5-valve disc plug, 6-valve disc, 7-connecting tenon groove, 8-medium ring cavity, 9-connecting tenon, 10-radial hole, 11-sealing ring, 12-cleaning guide rod, 13-cleaning medium hole, 14-valve cover, 15-valve stem, 16-positioning groove, 17-positioning bead, 18-medium connector, 19-drive handle. Detailed Implementation

[0025] exist Figure 1 In the online cleaning shut-off valve shown, the valve cover 14 is sealed and installed at the opening above the valve body 1. The valve stem 15 is screwed onto the valve body 1 through the valve cover 14. A handwheel is installed at the upper end of the valve stem 15. The valve disc 6 is movably installed at the lower end of the valve stem 15, located in the valve cavity of the valve body 1. The valve seat 2 is installed on the valve body 1. Its annular upper surface is a sealing surface that matches the sealing surface at the lower end of the valve disc 6 to form a sealing pair. The valve disc 6 in the valve cavity moves up and down relative to the valve seat 2 under the drive of the valve stem 15.

[0026] See Figure 2 and Figure 3 The valve stem 15 is a hollow component. A cleaning guide rod 12 is sealed and inserted into the inner hole of the valve stem 15 by several upper and lower sealing rings 11. The lower end of the cleaning guide rod 12 extends out of the lower end of the valve stem 15 and is inserted into the valve disc 6. The cleaning guide rod 12 can be moved axially and rotated within the valve stem 15. A positioning bead 17 is installed on the side wall of the upper end of the valve stem 15. Two positioning grooves 16 corresponding to the positioning bead 17 are provided on the outer periphery of the cleaning guide rod 12. The distance between the upper and lower positioning grooves 16 corresponds to the distance required for the vertical movement of the cleaning guide rod 12. The upper end of the cleaning guide rod 12 also extends out of the valve stem 15. A drive handle 19 is provided at the upper end of the cleaning guide rod 12. The drive handle 19 can simply be a rod that intersects the cleaning guide rod 12 perpendicularly. The cleaning guide rod 12 can be moved vertically or rotated by the drive handle 19. A connecting tenon 9 is provided on the lower end face of the cleaning guide rod 12, and a corresponding connecting tenon groove 7 is provided on the inner surface of the valve disc 6. The connecting tenon 9 is preferably a cross-shaped protrusion, and the connecting tenon groove 7 is a corresponding cross-shaped groove. See the figure for its shape. Figure 6 This allows the connecting tenon 9 to be rotated at most 90 degrees to connect with the connecting tenon groove 7. For ease of manufacturing, the connecting tenon groove 7 in the valve disc 6 is located on the upper end face of the valve disc plug 5. The valve disc plug 5 is screwed and fixed to the valve disc 6 from the bottom. After the cleaning guide rod 12 is moved downward, it is connected to the valve disc 6 through the connecting tenon 9 and the connecting tenon groove 7, so that the cleaning guide rod 12 is connected to the valve disc 6 and can drive the valve disc 6 to rotate.

[0027] A cleaning medium hole 13 is provided axially inside the cleaning guide rod 12. The cleaning medium hole 13 is closed at both ends. The upper end of the cleaning medium hole 13 can be connected to the medium connector 18. After the cleaning guide rod 12 is moved downward, the lower end of the cleaning medium hole 13 can be connected to the cleaning medium outlet 3 on the valve disc 6. The cleaning medium outlet 3 faces the sealing surface of the valve seat 2. The number of cleaning medium outlets 3 is preferably four to eight, and each cleaning medium outlet 3 is evenly distributed around the valve disc 6. To facilitate the connection between the upper end of the cleaning medium hole 13 and the medium connector 18, and the lower end of the cleaning medium hole 13 and the cleaning medium outlet 3 on the valve disc 6, radial holes 10 are provided at both ends of the cleaning guide rod 12 to communicate with the cleaning medium hole 13. The lower radial hole 10 is located above the connecting tenon 9. When the cleaning guide rod 12 is in the upper position, the upper radial hole 10 is located between the two sealing rings 11 installed between the cleaning guide rod 12 and the valve stem 15, and is not connected to the medium connector 18. The lower radial hole 10 is located on the upper side of the sealing ring 11 installed between the cleaning guide rod 12 and the valve disc 6, and is also blocked by the sealing ring 11 from communicating with the cleaning medium outlet 3. At this time, the shut-off valve is in normal working condition and no cleaning operation is performed.

[0028] When the shut-off valve needs cleaning, see [link / reference]. Figure 4 and Figure 5The valve stem 15 is driven to make the valve disc 6 and the valve seat 2 float in contact. The drive handle 19 is pressed down to move the cleaning guide rod 12 downward and rotate it at an appropriate angle so that the connecting tenon 9 at the lower end of the cleaning guide rod 12 is inserted into the connecting tenon groove 7 on the valve disc 6. At this time, the cleaning guide rod 12 can drive the valve disc 6 to rotate or swing back and forth, so that the valve disc 6 and the valve seat 2 rotate relative to each other. The debris and particles adhering to the sealing surface of the valve disc 6 and the sealing surface of the valve seat 2 are loosened by the rotation and friction of the valve disc 6, thereby detaching from the adhering sealing surface and playing a corresponding cleaning role. After the cleaning guide rod 12 moves downward, its upper radial hole 10 communicates with the medium connector 18 located on the outer circumferential surface of the extended end of the valve stem 15. The lower radial hole 10 is located in the medium annular cavity 8 within the valve disc 6 and communicates with each cleaning medium outlet 3 on the valve disc 6 through the connecting hole 4. At this time, a passage is formed between the medium connector 18 and the cleaning medium outlet 3. The medium connector 18 is connected to a pressure cleaning medium source, which is a compressed air source or a fluid pump. The pressure cleaning medium source provides compressed air or cleaning medium with a certain pressure. The cleaning medium is ejected from the cleaning medium outlet 3 towards the sealing surface of the valve seat 2. At this time, the valve stem 15 raises the valve disc 6 slightly, creating a gap between the valve disc 6 and the valve seat 2. The cleaning medium ejected from the cleaning medium outlet 3 effectively flushes the sealing surfaces of the valve disc 6 and valve seat 2, removing adhering dirt and particles. During the flushing process, the drive handle 19 causes the cleaning guide rod 12 to rotate the valve disc 6. The circumferential positions of the cleaning medium outlets 3 on the valve disc 6 rotate accordingly, thus ensuring that the entire sealing surface of the valve disc 6 and valve seat 2 is thoroughly cleaned. The entire cleaning process is performed online, requiring no disassembly of any components or interruption of the pipeline. The cleaning process is convenient, quick, and involves minimal workload and labor intensity.

[0029] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. An online cleaning shut-off valve, comprising a valve body (1), a valve stem (15) screwed onto the valve body (1) via a valve cover (14), a valve disc (6) mounted on the lower end of the valve stem (15), and a valve seat (2) mounted on the valve body (1) and mating with the sealing surface of the lower end of the valve disc (6), characterized in that: A cleaning guide rod (12) is sealed and inserted in the valve stem (15). The cleaning guide rod (12) can be moved axially and rotated within the valve stem (15). After the cleaning guide rod (12) is moved downward, it is connected to the valve disc (6). A cleaning medium hole (13) is provided axially within the cleaning guide rod (12). The upper end of the cleaning medium hole (13) can be connected to the medium connector (18). After the cleaning guide rod (12) is moved downward, the lower end of the cleaning medium hole (13) can be connected to the cleaning medium outlet (3) on the valve disc (6). The cleaning medium outlet (3) faces the sealing surface of the valve seat (2).

2. The online cleaning shut-off valve according to claim 1, characterized in that: The lower end of the cleaning guide rod (12) extends beyond the lower end of the valve stem (15) and is inserted into the valve disc (6). A connecting tenon (9) is provided on the lower end face of the cleaning guide rod (12), and a connecting tenon groove (7) corresponding to the connecting tenon (9) is provided on the corresponding surface inside the valve disc (6). After the cleaning guide rod (12) moves downward, it is connected to the valve disc (6) by the connecting tenon (9) and the connecting tenon groove (7).

3. The online cleaning shut-off valve according to claim 2, characterized in that: The connecting tenon groove (7) in the valve disc (6) is provided on the upper end face of the valve disc plug (5), which is screwed onto the valve disc (6) from the bottom.

4. The online cleaning shut-off valve according to claim 1, characterized in that: A positioning bead (17) is installed on the valve stem (15), and two positioning grooves (16) corresponding to the positioning bead (17) are provided on the outer periphery of the cleaning guide rod (12). The distance between the two positioning grooves (16) corresponds to the distance required for the cleaning guide rod (12) to move up and down.

5. The online cleaning shut-off valve according to claim 1, 2 or 4, characterized in that: A drive handle (19) is provided at the upper end of the cleaning guide rod (12).

6. The online cleaning shut-off valve according to claim 1, characterized in that: The cleaning medium hole (13) is closed at both ends, and radial holes (10) communicating with the cleaning medium hole (13) are provided at both ends of the cleaning guide rod (12).

7. The online cleaning shut-off valve according to claim 6, characterized in that: The media connector (18) is located on the outer circumferential surface of the extended end of the valve stem (15). After the cleaning guide rod (12) is moved downward, the radial hole (10) at the upper end is connected to the media connector (18) on the valve stem (15). After the cleaning guide rod (12) is moved upward, the radial hole (10) at the upper end is located between the two sealing rings (11) installed between the cleaning guide rod (12) and the valve stem (15).

8. The online cleaning shut-off valve according to claim 6, characterized in that: The radial hole (10) at the lower end of the cleaning guide rod (12) is located above the connecting tenon (9). After the cleaning guide rod (12) is moved downward, the radial hole (10) at the lower end is located in the medium ring cavity (8) inside the valve disc (6) and is connected to the cleaning medium outlet (3) on the valve disc (6) through the connecting hole (4) on the valve disc (6). After the cleaning guide rod (12) is moved upward, the radial hole (10) at the lower end is located on the upper side of the sealing ring (11) installed between the cleaning guide rod (12) and the valve disc (6).

9. The online cleaning shut-off valve according to claim 1, characterized in that: The medium connector (18) is connected to the pressure cleaning medium source.

10. The online cleaning shut-off valve according to claim 9, characterized in that: The pressure cleaning medium source is a compressed air source or a fluid pump.

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