A stop valve and a method of processing the same

Abstract

The application relates to a stop valve, aiming at the technical problem that the single sealing effect of the existing stop valve is poor for high-pressure medium, and the stop valve comprises a valve body, a closing mechanism, a shunt mechanism and a high-pressure filling sealing mechanism, the closing mechanism is arranged on the valve body through bolts, the shunt mechanism is arranged in an input end of the valve body, and the high-pressure filling sealing mechanism is arranged in the valve body and connected with the closing mechanism, wherein the shunt mechanism, the closing mechanism and the high-pressure filling sealing mechanism constitute an expansion sealing structure. After the valve body is connected with a pipeline and in a high-pressure state, the stop valve is filled with conveying medium to the shunt mechanism and then to the high-pressure filling sealing mechanism, the high-pressure filling sealing mechanism is deformed, the high-pressure filling sealing mechanism is attached to the closing mechanism, secondary sealing treatment is carried out, and the sealing effect of the stop valve is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, and more particularly to a gate valve and its processing method. Background Technology

[0002] The opening and closing element of a gate valve is a plug-shaped valve disc, with a flat or conical sealing surface. The valve disc moves linearly along the centerline of the valve seat. The valve stem movement (common name: non-rising stem) can also be a rising and rotating stem type, used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media.

[0003] Existing gate valves mostly operate by lifting and rotating rods. In the sealing and transportation of high-pressure fluids and gases, a single valve disc seal cannot effectively meet the requirements for opening and closing of such high-pressure media. Therefore, it is particularly important to propose a gate valve with a secondary seal. In view of this, we propose a gate valve. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, adapt to practical needs, and provide a gate valve to solve the technical problem of poor sealing effect of existing gate valves for single high-pressure media. To achieve this objective, the technical solution adopted is as follows: a gate valve is designed, including a valve body, a closing mechanism, a diverting mechanism, and a high-pressure filling and sealing mechanism. The valve body and the closing mechanism are bolted to the valve body. The diverting mechanism is located inside the valve body's input end. The high-pressure filling and sealing mechanism is located inside the valve body and connected to the closing mechanism. The diverting mechanism, the closing mechanism, and the high-pressure filling and sealing mechanism constitute an expansion sealing structure. This invention, through the connection of the valve body to the pipeline and under high pressure, creates a high-pressure state inside the gate valve. The medium is then filled and connected to the diverting mechanism, which in turn connects to the high-pressure filling and sealing mechanism. This causes the high-pressure filling and sealing mechanism to deform, resulting in a secondary sealing process where it comes into contact with the closing mechanism, effectively improving the sealing effect of the gate valve.

[0005] Preferably, the closing mechanism includes a valve cover, a screw, a connecting limit rod, and a valve disc. The valve cover is bolted to the top of the valve body, and a limit bracket is provided at the lower end of the valve cover. The screw passes through the inside of the valve cover, and the connecting limit rod is sleeved on the end of the screw via a bearing. The connecting limit rod is movably connected to the screw. The valve disc is arranged at the end of the connecting limit rod, and a beveled pressing block is provided at the bottom of the valve disc. This invention, by using a bearing sleeve on the screw, allows the screw to rotate while simultaneously using the limit bracket to limit the connecting limit rod and the valve disc. It prevents rotation during lifting and lowering, ensuring the beveled pressing block is always linked to the diversion mechanism.

[0006] Preferably, the diversion mechanism includes a sleeve and a resisting shaft. The sleeve is arranged inside the valve body input end, and the sleeve end has several diversion holes. A diversion cavity is formed inside the sleeve. The resisting shaft is arranged inside the diversion cavity and extends to the outside of the sleeve. The resisting shaft consists of a protruding shaft, a hollow shaft, and a beveled shaft. A connecting groove is provided inside the hollow shaft. A slot A communicating with the high-pressure filling and sealing mechanism is provided inside the beveled shaft. The gap between the outer wall of the resisting shaft and the inner wall of the sleeve forms a flow cavity. The resisting shaft is movably connected to the sleeve. The flow cavity, the connecting groove, and the slot A constitute an expansion communication cavity. This invention uses the protruding shaft to cooperate with the high-pressure fluid to move the entire resisting shaft when the shut-off valve is opened. This allows the protruding shaft to fit tightly against the inner wall of the diversion cavity to prevent backflow. Simultaneously, the slot A is misaligned with the high-pressure filling and sealing mechanism to close the expansion communication cavity and stabilize the internal pressure of the expansion communication cavity.

[0007] Furthermore, the high-pressure filling and sealing mechanism includes an installation groove and a sealing groove. The installation groove is located at the middle of the valve body, and the sealing groove is located within the groove of the installation groove. The sealing groove has a slot B that communicates with the installation groove, and a pressure relief hole is provided inside the installation groove, with a one-way plug inside the pressure relief hole. When the shut-off valve is open, the connection between the pressure relief hole and the installation groove and the sealing groove allows the sealing groove to have a pressure relief channel, enabling loosening between the sealing groove and the valve disc.

[0008] Preferably, the sealing groove block is made of shape memory metal and consists of a concave block, a protruding block, and a fitting block, with the concave block fixedly connected to the mounting groove block. The protruding block of this invention is made of shape memory metal and is deformable, while the concave block is welded to the mounting groove block, allowing the sealing groove block to be partially fixedly connected to the mounting groove block. This enables the sealing groove block to deform and directly fit the fitting block to the valve disc for secondary sealing.

[0009] Preferably, the closing mechanism uses a threaded lifting control to move the resistance shaft axially, forming a control switch that connects the expansion cavity with the high-pressure filling and sealing mechanism and / or connects the high-pressure filling and sealing mechanism with the pressure relief hole.

[0010] A method for manufacturing a gate valve includes the following steps:

[0011] S100: Valve body casting process: Valve body parts, valve cover, and mounting slot blocks are cast using molds;

[0012] S200: Accessory installation and processing: Weld the one-way plug to the mounting groove block, and weld the concave block on one side of the sealing groove block to the mounting groove block to achieve partial connection;

[0013] S300: Welding process: The valve body components are welded together to form a single unit;

[0014] S400: Installation and machining: Insert the anti-force shaft into the valve body input end, and rotate the sleeve to connect the sleeve to the valve body as a whole;

[0015] S500: Assembly and machining: The closing mechanism is connected to the valve body by bolts.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention, through the connection of the valve body to the pipeline and the high-pressure state inside the shut-off valve, and in conjunction with the filling of the conveying medium to the diversion mechanism to connect to the high-pressure filling and sealing mechanism, causes the high-pressure filling and sealing mechanism to deform, causing the high-pressure filling and sealing mechanism to fit into the closing mechanism, performing a secondary sealing process, effectively improving the sealing effect of the shut-off valve.

[0018] 2. The present invention uses a bearing sleeve on the screw, so that while the screw rotates, it works with the limiting frame to limit the connecting limiting rod and valve disc. It can only perform lifting and lowering operations and cannot rotate. The oblique cutting pressure block can always work in conjunction with the diversion mechanism.

[0019] 3. The present invention uses a raised shaft to move the entire force shaft in conjunction with the high-pressure fluid when the shut-off valve is opened, so that the raised shaft fits tightly against the inner wall of the diversion cavity to prevent backflow. At the same time, the groove A and the high-pressure filling and sealing mechanism are misaligned to close the expansion cavity and stabilize the internal pressure of the expansion cavity.

[0020] 4. When the shut-off valve is open, the present invention, in conjunction with the arrangement of the pressure relief hole communicating with the mounting groove block and the sealing groove block, enables the sealing groove block to have a pressure relief channel, allowing the sealing groove block to loosen from the valve disc.

[0021] 5. The protruding block of the present invention is made of shape memory metal and can be deformed. The concave block is welded to the mounting groove block, so that the sealing groove block is partially fixedly connected to the mounting groove block. This allows the sealing groove block to deform and directly attach the fitting block to the valve disc for secondary sealing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 2 This is a three-dimensional schematic diagram of the closing mechanism of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the valve body of the present invention;

[0025] Figure 4 For the present invention Figure 2 A magnified view of the structure at point A in the middle;

[0026] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the middle;

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the anti-force shaft of the present invention.

[0028] In the diagram: 1. Valve body; 2. Closing mechanism; 3. Diverting mechanism; 4. High-pressure filling and sealing mechanism;

[0029] 201. Valve cover; 202. Screw; 203. Connecting limit rod; 204. Valve disc;

[0030] 301. Sleeve; 302. Bearing shaft;

[0031] 401. Install the groove block; 402. Seal the groove block. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0033] Example 1: A shut-off valve, see [link to example]. Figures 1 to 6 The invention includes a valve body 1, a closing mechanism 2, a diversion mechanism 3, and a high-pressure filling and sealing mechanism 4. The valve body 1 and the closing mechanism 2 are bolted to the valve body 1. The diversion mechanism 3 is located inside the input end of the valve body 1. The high-pressure filling and sealing mechanism 4 is located inside the valve body 1 and connected to the closing mechanism 2. The diversion mechanism 3, the closing mechanism 2, and the high-pressure filling and sealing mechanism 4 constitute an expansion sealing structure. This invention, through the connection of the valve body 1 to the pipeline and under high pressure, creates a high-pressure environment inside the shut-off valve. The medium is then filled and connected to the diversion mechanism 3 and the high-pressure filling and sealing mechanism 4, causing the high-pressure filling and sealing mechanism 4 to deform and adhere to the closing mechanism 2, performing a secondary sealing process and effectively improving the sealing effect of the shut-off valve.

[0034] Specifically, the closing mechanism 2 includes a valve cover 201, a screw 202, a connecting limit rod 203, and a valve disc 204. The valve cover 201 is bolted to the top of the valve body 1. A limit bracket is provided at the lower end of the valve cover 201. The screw 202 passes through the inside of the valve cover 201. The connecting limit rod 203 is sleeved on the end of the screw 202 via a bearing. The connecting limit rod 203 is movably connected to the screw 202. The valve disc 204 is located at the end of the connecting limit rod 203, and a beveled pressing block is provided at the bottom of the valve disc 204. This invention, by using a bearing sleeve on the screw 202, allows the screw 202 to rotate while simultaneously using the limit bracket to limit the connecting limit rod 203 and the valve disc 204. It only performs lifting and lowering operations and cannot rotate, ensuring the beveled pressing block is always linked with the diversion mechanism 3.

[0035] Furthermore, the diversion mechanism 3 includes a sleeve 301 and a support shaft 302. The sleeve 301 is arranged inside the input end of the valve body 1, and several diversion holes are opened at the end of the sleeve 301. A diversion cavity is opened inside the sleeve 301. The support shaft 302 is arranged inside the diversion cavity and extends to the outside of the sleeve 301. The support shaft 302 is composed of a protruding shaft, a hollow shaft, and a beveled shaft. A connecting groove is provided inside the hollow shaft. A slot A communicating with the high-pressure filling and sealing mechanism 4 is provided inside the beveled shaft. The gap between the outer wall of the support shaft 302 and the inner wall of the sleeve 301 forms a flow cavity. The support shaft 302 is movably connected to the sleeve 301. The flow cavity, the connecting groove, and the slot A constitute an expansion connecting cavity. The present invention uses a raised shaft to move the entire force shaft 302 in conjunction with the high-pressure fluid when the shut-off valve is opened, so that the raised shaft fits tightly against the inner wall of the diversion cavity to prevent backflow. At the same time, the groove A and the high-pressure filling and sealing mechanism 4 are misaligned to close the expansion communication cavity and stabilize the internal pressure of the expansion communication cavity.

[0036] Furthermore, the high-pressure filling and sealing mechanism 4 includes a mounting groove 401 and a sealing groove 402. The mounting groove 401 is arranged in the middle of the valve body 1, and the sealing groove 402 is arranged in the groove of the mounting groove 401. The sealing groove 402 has a slot B that communicates with the mounting groove 401, and the mounting groove 401 has a pressure relief hole inside, with a one-way plug inside the pressure relief hole. When the shut-off valve is opened, the connection between the pressure relief hole and the mounting groove 401 and the sealing groove 402 allows the sealing groove 402 to have a pressure relief channel, enabling the sealing groove 402 to loosen from the valve disc 204.

[0037] It is worth noting that the sealing groove block 402 is made of shape memory metal and consists of a concave block, a protruding block, and a fitting block, with the concave block fixedly connected to the mounting groove block 401. The protruding block of this invention is made of shape memory metal and is deformable, while the concave block is welded to the mounting groove block 401, allowing the sealing groove block 402 to be partially fixedly connected to the mounting groove block 401. This allows the sealing groove block 402 to deform and directly fit the fitting block to the valve disc 204 for secondary sealing.

[0038] In addition, the closing mechanism 2 uses a threaded lifting control to move the resistance shaft 302 axially, forming an expansion communication cavity that connects with the high-pressure filling sealing mechanism 4 and / or forming a control switch that connects the high-pressure filling sealing mechanism 4 with the pressure relief hole.

[0039] Working principle:

[0040] Installation process: Connect the shut-off valve to the input and output pipes using bolts; initial sealing process: Manually rotate the screw 202 in conjunction with the limit bracket to allow the connecting limit rod 203 and valve disc 204 to descend, ensuring the valve disc 204 fully engages with the mounting groove block 401 for the initial sealing; secondary sealing process: Based on the initial sealing process, when the valve disc 204 descends, the oblique-cut pressure block contacts the pressure shaft 302. The oblique shape of the pressure shaft 302 and the oblique-cut pressure block causes the pressure shaft 302 to move, connecting the expansion cavity to the high-pressure filling sealing mechanism 4. The high-pressure medium in the input pipe causes the sealing groove block 402 to deform, thus performing a secondary sealing on the valve disc 204.

[0041] Example 2: A method for processing a gate valve, comprising the following steps:

[0042] S100: Valve body casting process: The valve body 1 parts, valve cover 201, and mounting slot block 401 are cast and formed using molds;

[0043] S200: Accessory installation and processing: Weld the one-way plug to the mounting groove 401, and weld the concave block on one side of the sealing groove 402 to the mounting groove 401 to form a partial connection;

[0044] S300: Welding process: The valve body 1 component is welded together to form a single unit;

[0045] S400: Installation and processing: Insert the support shaft 302 into the input end of the valve body 1, and at the same time rotate the sleeve 301 to connect the sleeve 301 with the valve body 1 as a whole;

[0046] S500: Assembly and processing: The closing mechanism 2 is connected to the valve body 1 by bolts.

[0047] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A shut-off valve, characterized in that, include: Valve body (1); closing mechanism (2), which is bolted to the valve body (1); flow diversion mechanism (3), which is arranged inside the input end of the valve body (1); high pressure filling and sealing mechanism (4), which is arranged inside the valve body (1) and connected to the closing mechanism (2), wherein the flow diversion mechanism (3), the closing mechanism (2), and the high pressure filling and sealing mechanism (4) constitute an expansion sealing structure; The high-pressure filling and sealing mechanism (4) includes: a mounting groove (401) arranged in the middle of the valve body (1); a sealing groove (402) arranged in the groove of the mounting groove (401), wherein the sealing groove (402) has a hole B that communicates with the mounting groove (401), and the mounting groove (401) has a pressure relief hole inside, and a one-way plug is provided in the pressure relief hole; The closing mechanism (2) includes: a valve cover (201), which is bolted to the top of the valve body (1), wherein a limit bracket is provided at the lower end of the valve cover (201); a screw (202), which passes through the inside of the valve cover (201); a connecting limit rod (203), which is sleeved on the end of the screw (202) through a bearing; wherein the connecting limit rod (203) is movably connected to the screw (202); and a valve disc (204), which is arranged at the end of the connecting limit rod (203), and a beveled pressing block is provided at the bottom of the valve disc (204). The diversion mechanism (3) includes: a sleeve (301) arranged inside the input end of the valve body (1), and the sleeve (301) has several diversion holes at its end, wherein the sleeve (301) has a diversion cavity inside; a support shaft (302) arranged inside the diversion cavity and extending to the outside of the sleeve (301), wherein the support shaft (302) is composed of a protruding shaft, a hollow shaft, and a chamfered shaft, wherein the hollow shaft has a connecting groove inside, wherein the chamfered shaft has a hole groove A that communicates with the high-pressure filling sealing mechanism (4), wherein the gap between the outer wall of the support shaft (302) and the inner wall of the sleeve (301) forms a flow cavity, wherein the support shaft (302) is movably connected to the sleeve (301), wherein the flow cavity, the connecting groove, and the hole groove A constitute an expansion connecting cavity.

2. A shut-off valve as described in claim 1, characterized in that, The sealing groove block (402) is made of shape memory metal and consists of a concave block, a protruding block and a fitting block, and the concave block is fixedly connected to the mounting groove block (401).

3. A shut-off valve as described in claim 2, characterized in that, The closing mechanism (2) uses a threaded lifting control to move the resistance shaft (302) axially, forming an expansion communication cavity that connects with the high-pressure filling sealing mechanism (4) and / or forming a control switch that connects the high-pressure filling sealing mechanism (4) with the pressure relief hole.

4. A method for processing a stop valve according to any one of claims 1-3, characterized in that, Includes the following steps: S100: Valve body casting process: The valve body (1) accessories, valve cover (201) and mounting slot (401) are cast and formed by using molds; S200: Accessory installation and processing: Weld the one-way plug to the mounting groove (401) and weld the inner concave block on one side of the sealing groove (402) to the mounting groove (401) to form a partial connection; S300: Welding process: The valve body (1) and accessories are welded together to form a whole; S400: Installation and processing: Insert the support shaft (302) into the input end of the valve body (1), and at the same time rotate the sleeve (301) to connect the sleeve (301) and the valve body (1) as a whole; S500: Assembly and processing: The closing mechanism (2) is connected to the valve body (1) by bolts.

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