Online cleaning type stop valve

Abstract

The invention discloses an online 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, a cleaning guide rod is inserted in the valve rod in a sealed mode, and the cleaning guide rod can move in the valve rod in the axial direction and can rotate. 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 conducted on the sealing face of the stop valve under the condition that the stop valve or the valve deck is not disassembled.

Description

Technical Field

[0001] The present invention relates to a valve, in particular to a stop valve requiring cleaning and maintenance. Background Art

[0002] A globe valve shuts off liquid in a pipeline by applying torque to the valve stem, which in turn applies axial pressure to the valve disc, forcing the disc sealing surface to fit tightly against the seat sealing surface, preventing leakage through the gap between the sealing surfaces. Globe valves are widely used in industries such as shipping, sewage treatment, and the chemical industry. After a period of use, they can become leaky, especially when the liquid in the pipeline contains a high concentration of impurities. Impurities, oil, and particulate matter in the liquid can adhere to the disc and seat sealing surfaces, preventing them from fitting tightly together. In order to maintain the function of the stop valve, it is necessary to clean the stop valve in this type of usage scenario regularly or in a timely manner. When cleaning, the stop valve needs to be removed from the pipeline, or the valve cover needs to be removed from the valve body so that the valve disc and the valve seat can be accessed for cleaning. This process is labor-intensive and requires the use of the section of pipeline to be stopped, that is, maintenance needs to be stopped. However, in a ship during navigation, the pipeline function cannot be easily stopped. Once the stop valve needs to close the pipeline and it cannot be reliably achieved, the use of the pipeline where the stop valve is located can only be stopped for maintenance, which will inevitably affect the normal navigation of the ship and will bring many problems. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an online cleaning stop valve, which can perform online cleaning on the sealing surface of the stop valve without disassembling the stop valve or its valve cover.

[0004] In order to solve the above technical problems, the present invention provides an online cleaning stop valve, including a valve body, a valve stem screwed to the valve body through a valve cover, a valve disc installed at the lower end of the valve stem, and a valve seat installed on the valve body and matching 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 displaced and rotatable in the valve stem. After the cleaning guide rod is displaced downward, it is connected to the valve disc; a cleaning medium hole is axially provided in the cleaning guide rod. The upper end of the cleaning medium hole can be connected to the medium joint. After the cleaning guide rod is displaced downward, the lower end of the cleaning medium hole can be connected to the cleaning medium outlet on the valve disc, and the cleaning medium outlet faces the sealing surface of the valve seat.

[0005] In the above structure, since a cleaning guide rod is seal-inserted in the valve stem, the cleaning guide rod can be axially displaced and rotated in the valve stem, and is connected to the valve disc after being displaced downward, the cleaning guide rod that can be displaced up and down inside the valve stem will be displaced downward when the valve needs to be cleaned, so that the cleaning guide rod and the valve disc are connected together, and when the cleaning guide rod is rotated, the valve disc will be driven 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, so that debris and particles adhering to the sealing surface of the valve disc and the sealing surface of the valve seat can be loosened by the rotation and friction of the valve disc, thereby breaking away from the adhering sealing surface, thereby playing a corresponding cleaning role.

[0006] Since a cleaning medium hole is axially provided in the cleaning guide rod, the upper end of the cleaning medium hole can be connected to the medium joint, and the lower end of the cleaning medium hole can be connected to the cleaning medium outlet on the valve disc after the cleaning guide rod is shifted downward, and the cleaning medium outlet faces the sealing surface of the valve seat. The cleaning medium can enter the cleaning medium hole from the medium joint, and pass through the cleaning medium hole to the cleaning medium outlet on the valve disc after the cleaning guide rod is shifted downward, and then be ejected from the cleaning medium outlet to the valve seat sealing surface with a certain pressure. At this time, the valve disc is in a position close to the valve seat and has a certain gap. The cleaning medium ejected from the cleaning medium outlet will have a good flushing effect on the sealing surface of the valve disc and the valve seat, and peel off the dirt and particulate matter adhered thereto. During the flushing process, the valve disc is driven to rotate by the cleaning guide rod, and the circumferential position of the cleaning medium outlet on the valve disc will rotate accordingly, so that the sealing surface 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 by simply driving the cleaning guide rod to axially shift and rotate. The entire cleaning process is carried out online, without the need to remove the valve or valve cover, nor to stop the use of the pipeline where the valve is located. The cleaning process is convenient and fast, with small workload and low labor intensity.

[0008] In a preferred embodiment of the present invention, the lower end of the cleaning guide rod extends beyond the lower end of the valve stem and is inserted into the valve disc. A connecting tenon is provided on the lower end surface of the cleaning guide rod, and a connecting tenon groove corresponding to the connecting tenon is provided on a corresponding surface within the valve disc. After the cleaning guide rod is displaced downward, it is plugged into the valve disc via 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 upward and downward movement of the cleaning guide rod. The provided connecting tenon and the connecting tenon groove facilitate connection and disconnection between the cleaning guide rod and the valve disc through the upward and downward movement of the cleaning guide rod.

[0009] In another preferred embodiment of the present invention, the connecting groove is provided on the upper end surface of the valve disc cock, and the valve disc cock is screwed onto the valve disc from the bottom of the valve disc. This embodiment facilitates the manufacturing and processing of the valve disc and the connecting groove.

[0010] In another preferred embodiment of the present invention, a positioning bead is mounted on the valve stem, and two upper and lower positioning grooves corresponding to the positioning bead are provided on the outer periphery of the cleaning guide rod. The spacing between the upper and lower positioning grooves corresponds to the spacing required for the vertical displacement of the cleaning guide rod. With this embodiment, the cleaning guide rod has a fixed position when it moves up and down, and is easy to use.

[0011] In a further preferred embodiment of the present invention, a driving handle is provided at the upper end of the cleaning guide rod. With this embodiment, the cleaning guide rod can be shifted up and down and rotated by the driving handle, and the control is convenient.

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

[0013] In a further preferred embodiment of the present invention, the media connector is disposed on the outer circumferential surface of the extended end of the valve stem. When the cleaning guide rod is displaced downward, the radial hole at the upper end communicates with the media connector on the valve stem. When the cleaning guide rod is displaced upward, the radial hole at the upper end is located between 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 displaced downward, while the two sealing rings seal and isolate the radial hole when the cleaning guide rod is displaced upward and in a non-cleaning state. Liquid in the pipeline flowing through the stop valve is prevented from leaking out through the cleaning media hole.

[0014] In a further preferred embodiment of the present invention, the radial hole at the lower end of the cleaning guide rod is located above the connecting tenon, and after the cleaning guide rod is displaced downward, the radial hole at the lower end is located in the medium annular cavity in the valve disc, and is connected to the cleaning medium outlet on the valve disc through the connecting hole on the valve disc, and after the cleaning guide rod is displaced 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. With this embodiment, it is possible to ensure that the cleaning medium in the cleaning medium hole flows to the cleaning medium outlet after the cleaning guide rod is displaced downward, and the arrangement of the medium annular cavity can ensure that the cleaning medium flowing out of the radial hole flows to multiple cleaning medium outlets. When the cleaning guide rod is displaced upward and is in a non-cleaning state, the radial hole is located above the sealing ring, and the sealing ring seals and isolates the radial hole from the medium annular cavity. Liquid in the pipeline flowing through the stop valve will not enter the cleaning medium hole through the cleaning medium outlet and the medium annular cavity, and will not leak out through the cleaning medium hole.

[0015] In another further preferred embodiment of the present invention, the medium connector is connected to a pressure cleaning medium source. With this embodiment, the cleaning medium ejected from the cleaning medium outlet is provided by the pressure cleaning medium source, ensuring a constant working pressure during the cleaning operation and achieving an excellent cleaning effect.

[0016] In another further preferred embodiment of the present 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 liquid with a certain pressure, both of which can ensure the effective realization of flushing and cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The online cleaning stop valve of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a structural diagram of a specific embodiment of the online cleaning stop valve of the present invention;

[0019] Figure 2 yes Figure 1 A partial enlarged view of position I in the structure shown;

[0020] Figure 3 yes Figure 1 A partial enlarged view of site II in the structure shown;

[0021] Figure 4 yes Figure 2 The structure shown is a schematic diagram of the cleaning guide rod shifting downward and in a cleaning working state;

[0022] Figure 5 yes Figure 3 The structure shown is a schematic diagram of the cleaning guide rod shifting downward and in a cleaning working state;

[0023] Figure 6 yes Figure 1 Top view of the valve disc cock in the illustrated configuration.

[0024] In the figure: 1-valve body, 2-valve seat, 3-cleaning medium outlet, 4-connecting hole, 5-valve disc plug, 6-valve disc, 7-connecting tenon, 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 joint, 19-driving handle. DETAILED DESCRIPTION

[0025] exist Figure 1In the online cleaning stop valve shown, the valve cover 14 is sealingly mounted at the opening above the valve body 1, the valve stem 15 is screwed to the valve body 1 through the valve cover 14, a handwheel is mounted on the upper end of the valve stem 15, the valve disc 6 is movably mounted at the lower end of the valve stem 15 and is located in the valve cavity of the valve body 1, the valve seat 2 is mounted on the valve body 1, the annular upper surface of which is a sealing surface that matches the sealing surface at the lower end of the valve disc 6 to form a sealing pair, and the valve disc 6 in the valve cavity is opened and closed and raised and lowered relative to the valve seat 2 under the drive of the valve stem 15.

[0026] See also Figure 2 and Figure 3 The valve stem 15 is a hollow component. A cleaning guide rod 12 is sealed and inserted in the inner hole of the valve stem 15 through 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 axially displaced and rotatable in the valve stem 15. A positioning bead 17 is installed on the side wall of the upper end of the valve stem 15. Upper and lower positioning grooves 16 corresponding to the positioning beads 17 are provided on the outer periphery of the cleaning guide rod 12. The spacing between the upper and lower positioning grooves 16 corresponds to the spacing required for the up and down displacement of the cleaning guide rod 12. The upper end of the cleaning guide rod 12 also extends out of the valve stem 15. A driving handle 19 is provided at the upper end of the cleaning guide rod 12. The driving handle 19 can be simply a rod that intersects the cleaning guide rod 12 perpendicularly. The cleaning guide rod 12 can be driven to shift up and down or rotate by the driving handle 19. A connecting tenon 9 is provided on the lower end surface 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. The connecting tenon 9 is preferably a cross-shaped convex tenon, and the connecting tenon groove 7 is correspondingly a cross-shaped tenon groove. Figure 6 , so that the connecting tenon 9 only needs to be rotated 90 degrees at most to be connected with the connecting tenon groove 7. For the convenience of manufacturing, the connecting tenon groove 7 in the valve disc 6 is set on the upper end surface of the valve disc cock 5. The valve disc cock 5 is screwed and fixed to the valve disc 6 from the bottom of the valve disc 6. After the cleaning guide rod 12 is shifted 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, which can drive the valve disc 6 to rotate.

[0027] A cleaning medium hole 13 is axially provided in the cleaning guide rod 12. Both ends of the cleaning medium hole 13 are closed. The upper end of the cleaning medium hole 13 can be connected to the medium joint 18. After the cleaning guide rod 12 is shifted 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 the cleaning medium outlets 3 is preferably four to eight, and each cleaning medium outlet 3 is evenly distributed along the circumference of the valve disc 6. In order to facilitate the connection between the upper end of the cleaning medium hole 13 and the medium joint 18 and the connection between the lower end of the cleaning medium hole 13 and the cleaning medium outlet 3 on the valve disc 6, radial holes 10 connected to the cleaning medium hole 13 are respectively provided at both ends of the cleaning guide rod 12, wherein the radial hole 10 at the lower end is located above the connecting tenon 9. When the cleaning guide rod 12 is in the upper position, 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, and is not connected to the medium joint 18. 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, and is also blocked by the sealing ring 11 from being connected to the cleaning medium outlet 3. At this time, the stop valve is in normal working condition and no cleaning operation is performed.

[0028] When the stop valve needs to be cleaned, refer to Figure 4 and Figure 5, drive the valve stem 15 to make the valve disc 6 and the valve seat 2 in a floating contact state, press down the driving handle 19 to shift the cleaning guide rod 12 downward, and rotate it at a certain 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 breaking away from the adhering sealing surface, thereby playing a corresponding cleaning role. After the cleaning guide rod 12 is shifted downward, the radial hole 10 at its upper end is connected to the medium joint 18 provided on the outer peripheral surface of the extended end of the valve stem 15, and the radial hole 10 at the lower end is located in the medium annular cavity 8 in the valve disc 6, and is connected to each cleaning medium outlet 3 on the valve disc 6 through the communicating hole 4 on the valve disc 6. At this time, a passage is formed from the medium joint 18 to the cleaning medium outlet 3, and the medium joint 18 is connected to the pressure cleaning medium source. The pressure cleaning medium source is a compressed air source or a fluid pump. The compressed air or cleaning medium with a certain pressure provided by the pressure cleaning medium source Liquid is ejected from the cleaning medium outlet 3 toward the sealing surface of the valve seat 2. At this time, the valve disc 6 is lifted a short distance by the valve stem 15 to create a certain gap between the valve disc 6 and the valve seat 2. The cleaning medium ejected from the cleaning medium outlet 3 will have a good flushing effect on the sealing surface of the valve disc 6 and the valve seat 2, peeling off the dirt and particles adhering thereto. During the flushing process, the cleaning guide rod 12 is driven by the driving handle 19 to rotate the valve disc 6. The circumferential positions of the cleaning medium outlets 3 on the valve disc 6 will rotate accordingly, thereby cleaning the entire sealing surface of the valve disc 6 and the valve seat 2. The entire cleaning process is carried out online without the need to disassemble any components or stop the use of the pipeline where the valve is located. The cleaning process is convenient and fast, with low workload and low labor intensity.

[0029] The above only lists some preferred embodiments of the present invention, but the present invention is not limited thereto, and many improvements and modifications can be made. As long as the improvements and modifications are made on the basis of the basic principles of the present invention, they should be considered to fall within the scope of protection of the present invention.

Claims

1. An online cleaning type stop valve, comprising a valve body (1), a valve stem (15) screwed to the valve body (1) through 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 matching 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 axially displaced and rotated in the valve stem (15). After the cleaning guide rod (12) is displaced downward, it is connected to the valve disc (6). A cleaning medium hole (13) is axially provided in the cleaning guide rod (12). The upper end of the cleaning medium hole (13) can be communicated with the medium joint (18). After the cleaning guide rod (12) is displaced downward, the lower end of the cleaning medium hole (13) can be communicated with 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 stop valve according to claim 1, characterized in that: 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). A connecting tenon (9) is provided on the lower end surface 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) is displaced downward, it is plugged into and connected to the valve disc (6) through the connecting tenon (9) and the connecting tenon groove (7).

3. The online cleaning stop valve according to claim 2, characterized in that: The connecting tongue and groove (7) in the valve disc (6) is arranged on the upper end surface of the valve disc rotary plug (5), and the valve disc rotary plug (5) is screwed onto the valve disc (6) from the bottom of the valve disc (6).

4. The online cleaning stop valve according to claim 1, characterized in that: A positioning bead (17) is installed on the valve stem (15), and two upper and lower positioning grooves (16) corresponding to the positioning bead (17) are provided on the outer periphery of the cleaning guide rod (12), and the spacing between the upper and lower positioning grooves (16) corresponds to the spacing required for the upper and lower displacement of the cleaning guide rod (12).

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

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

7. The online cleaning stop valve according to claim 6, characterized in that: The medium joint (18) is arranged on the outer peripheral surface of the extended end of the valve stem (15); after the cleaning guide rod (12) is displaced downward, the radial hole (10) at the upper end is communicated with the medium joint (18) on the valve stem (15); after the cleaning guide rod (12) is displaced upward, the radial hole (10) at the upper end is located between two sealing rings (11) installed between the cleaning guide rod (12) and the valve stem (15).

8. The online cleaning stop 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 displaced downward, the radial hole (10) at the lower end is located in the medium annular cavity (8) in 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 displaced 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 stop valve according to claim 1, characterized in that: The medium connector (18) is connected to a pressure cleaning medium source.

10. The online cleaning stop 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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