Quick assembly process for valve seat of plug valve

Abstract

The invention relates to a quick assembly process for a valve seat of a plug valve. The quick assembly process comprises the following steps that the small head end of a guide sleeve is mounted at a flange of a valve body of the plug valve; when the plug valve is used, the valve seat is firstly arranged in the conical shaft hole of the guide sleeve from the upper part of the guide sleeve, then the valve seat is pressed into the guide sleeve by using the large end of the pressing block, and finally the valve seat is pressed into the inner cavity of the plug valve body by using the small end of the pressing block; the split supporting block assembly is firstly placed in the valve seat, then the wedge-shaped block is inserted into the wedge-shaped groove between the two split supporting blocks, and the wedge-shaped block is pressed downwards to enable the split supporting block assembly to open the valve seat. The taper plug is installed in the valve seat firstly, then the taper plug is pressed downwards through external force so that the taper plug can open the valve seat, and finally the taper plug is pulled out. The relative position accuracy of the valve seat and the valve body and the relative position accuracy of the valve seat and the pressing block are guaranteed, unsafe factors are reduced, the sealing performance of the valve seat can be guaranteed, and the assembling efficiency of the valve seat is effectively improved.

Description

Technical Field

[0001] The invention belongs to a process for assembling a valve seat of a soft-sealed plug valve, and specifically discloses a process for quickly assembling a valve seat of a plug valve. Background Art

[0002] A plug valve is a valve that controls the flow of fluid by rotating the plug body. During the assembly of a soft-sealed plug valve, the assembly effect of the valve seat directly affects the sealing performance and operating torque of the valve. When assembling the valve seat, the valve seat is easily moved under pressure, which creates an unsafe factor. At the same time, in order to ensure the sealing performance of the valve, the valve seat needs to be pressed multiple times and the tooling needs to be frequently switched, which is a complex, time-consuming and inefficient process. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a rapid assembly process for a plug valve seat which has a simple procedure, saves time and is highly efficient.

[0004] According to the technical solution provided by the present invention, the plug valve seat rapid assembly process comprises the following steps: S1. Install the small end of the guide sleeve on the flange of the plug valve body. The guide sleeve has a conical shaft hole, and the diameter of the conical shaft hole of the guide sleeve is gradually reduced in the direction from top to bottom. S2. First, install the valve seat into the conical shaft hole of the guide sleeve from the top of the guide sleeve, then use the large head end of the pressure block to press the valve seat into the guide sleeve, and finally use the small head end of the pressure block to press the valve seat into the inner cavity of the valve body of the plug valve; the pressure block is a stepped cylindrical shape, the large head end of the pressure block has a diameter larger than the upper end diameter of the valve seat, the small head end of the pressure block has a diameter smaller than the lower end diameter of the conical shaft hole of the guide sleeve, and the small head end of the pressure block and the lower end of the conical shaft hole of the guide sleeve are in a clearance fit; S3. First, place the split support block assembly into the valve seat. The split support block assembly consists of two split support blocks. A wedge-shaped groove is provided between the two split support blocks. Then, insert the wedge block into the wedge-shaped groove between the two split support blocks. Press the wedge block downward by external force to make the split support block assembly open the valve seat. Then, repeatedly lift the wedge block, rotate the split support block assembly, and then press the wedge block downward to rotate the wedge-shaped groove 180°. The sealing area of ​​the valve seat is squeezed in a targeted manner by the split support block assembly to ensure the sealing performance of the valve seat. Finally, lift the wedge block and remove the split support block assembly. S4. First install the cone plug in the valve seat, then press the cone plug downward by external force to make the cone plug open the valve seat, and perform secondary extrusion on the valve seat to make the valve seat further fit tightly with the inner cavity of the valve body to ensure the sealing performance of the valve seat. Finally, pull out the cone plug to complete the rapid assembly process of the plug valve seat.

[0005] Preferably, a connection block and a lifting screw are also used in step S3 and step S4, wherein the connection block comprises a connection block top plate, a connection block connecting side plate and a connection block bottom plate fixed integrally from top to bottom, a lifting screw installation notch is provided on the connection block top plate, and an external expansion component installation notch is provided on the connection block bottom plate; The width of the bolt head portion of the lifting screw is greater than the width of the lifting screw installation notch, and the screw rod portion of the lifting screw is clearance-matched with the lifting screw installation notch.

[0006] Preferably, the wedge block comprises a wedge block body, a wedge block connecting bottom plate, a wedge block connecting column and a wedge block connecting top plate fixed from bottom to top; The widths of the wedge block connecting the bottom plate and the wedge block connecting the top plate are both greater than the width of the installation notch of the outward expansion component, and the wedge block connecting column cooperates with the installation notch of the outward expansion component; after the wedge block connecting column moves into the installation notch of the outward expansion component, there is a clearance fit between the top surface of the wedge block connecting the bottom plate and the bottom surface of the connecting block bottom plate, as well as between the bottom surface of the wedge block connecting the top plate and the top surface of the connecting block top plate.

[0007] Further preferably, when the wedge block needs to be pressed down, the wedge block connecting column on the wedge block is first moved into the installation notch of the outward expansion component on the connecting block, and then the downward pressure of the pressure head of the press is applied to the top surface of the top plate of the connecting block to press down the wedge block; When the wedge block needs to be pulled out upward, first screw the screw part of the lifting screw upward into the pressure head of the press, then drive the pressure head of the press to move the lifting screw into the lifting screw installation notch, and finally drive the pressure head of the press to rise, and then the wedge block can be pulled out upward.

[0008] Preferably, the cone plug comprises a cone plug body, a cone plug connecting column and a cone plug connecting top plate fixed integrally from bottom to top; The width of the cone plug connection top plate is greater than the width of the installation notch of the external expansion component. After the cone plug connection column moves into the installation notch of the external expansion component, there is a clearance fit between the top surface of the cone plug body and the bottom surface of the connection block bottom plate, as well as between the bottom surface of the cone plug connection top plate and the top surface of the connection block top plate. Further preferably, when the cone plug needs to be pressed down, the cone plug connecting column on the cone plug is first moved into the installation notch of the outer expansion component on the connecting block, and then the downward pressure of the pressure head of the press is applied to the top surface of the top plate of the connecting block to press down the cone plug; When the cone plug needs to be pulled out upward, first screw the screw part of the lifting screw upward into the pressure head of the press, then drive the pressure head of the press to move the lifting screw into the lifting screw installation notch, and finally drive the pressure head of the press to rise, and then the cone plug can be pulled out upward.

[0009] Compared with the prior art, the present invention has the following advantages: 1. The present invention ensures the relative position accuracy between the valve seat and the valve body, and between the valve seat and the pressing block, reduces unsafe factors, and effectively improves the valve seat assembly efficiency.

[0010] 2. The present invention can ensure the sealing performance of the valve seat and effectively improve the assembly efficiency of the valve seat.

[0011] 3. The present invention can not only reduce the number of operations during the process of pressing and lifting the wedge block and the cone plug, but also enable quick disassembly and assembly when replacing the wedge block and the cone plug, thereby effectively improving the assembly efficiency of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the guide sleeve installed on the plug valve body.

[0013] Figure 2 It is a structural diagram of the valve seat being pressed into the inner cavity of the plug valve body.

[0014] Figure 3 It is a schematic diagram of the structure of using a split support block assembly and a wedge block to extrude the valve seat.

[0015] Figure 4 It is a schematic diagram of the structure of using a cone plug to squeeze the valve seat. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0017] A rapid assembly process for a plug valve seat, the process comprising the following steps: S1. Install the small end of the guide sleeve 1 on the flange of the plug valve body 8. The guide sleeve 1 has a conical axial hole, and the diameter of the conical axial hole of the guide sleeve 1 is gradually reduced in the direction from top to bottom. Figure 1 As shown; S2. First, install the valve seat 9 into the conical shaft hole of the guide sleeve 1 from the top of the guide sleeve 1, then use the large end of the pressure block 2 to press the valve seat 9 into the guide sleeve 1, and finally use the small end of the pressure block 2 to press the valve seat 9 into the inner cavity of the valve body 8 of the plug valve; the pressure block 2 is a stepped cylindrical shape, the large end diameter of the pressure block 2 is larger than the upper end diameter of the valve seat 9, the small end diameter of the pressure block 2 is smaller than the lower end diameter of the conical shaft hole of the guide sleeve 1, and the small end of the pressure block 2 and the lower end of the conical shaft hole of the guide sleeve 1 are in a clearance fit, such as Figure 2 As shown; S3. First, place the split support block assembly 3 into the valve seat 9. The split support block assembly 3 is composed of two split support blocks. A wedge-shaped groove 3.1 is provided between the two split support blocks. Then, insert the wedge block 4 into the wedge-shaped groove 3.1 between the two split support blocks. Press the wedge block 4 downward by external force to make the split support block assembly 3 open the valve seat 9. Then, repeatedly lift the wedge block 4, rotate the split support block assembly 3, and then press the wedge block 4 downward to rotate the wedge-shaped groove 3.1 by 180°. The sealing area of ​​the valve seat 9 is squeezed in a targeted manner by the split support block assembly 3 to ensure the sealing performance of the valve seat 9. Finally, lift the wedge block 4 and remove the split support block assembly 3. Figure 3 As shown; S4, first install the cone plug 5 in the valve seat 9, then press the cone plug 5 downward by external force to make the cone plug 5 open the valve seat 9, perform secondary extrusion on the valve seat 9, so that the valve seat 9 is further closely fitted with the inner cavity of the valve body 8 to ensure the sealing performance of the valve seat 9, and finally pull out the cone plug 5 to complete the rapid assembly process of the plug valve seat. Figure 4 shown.

[0018] In step S3 and step S4, a connection block 6 and a lifting screw 7 are also used. The connection block 6 includes a connection block top plate 6.1, a connection block connecting side plate 6.2 and a connection block bottom plate 6.3 fixed integrally from top to bottom. A lifting screw installation notch 6.11 is provided on the connection block top plate 6.1, and an external expansion component installation notch 6.31 is provided on the connection block bottom plate 6.3. The width of the bolt head portion of the lifting screw 7 is greater than the width of the lifting screw installation notch 6.11, and the screw rod portion of the lifting screw 7 is clearance-matched with the lifting screw installation notch 6.11.

[0019] The wedge block 4 comprises a wedge block body 4.1, a wedge block connecting bottom plate 4.2, a wedge block connecting column 4.3 and a wedge block connecting top plate 4.4 fixed from bottom to top; The widths of the wedge block connecting bottom plate 4.2 and the wedge block connecting top plate 4.4 are both greater than the width of the outward expansion component installation notch 6.31, and the wedge block connecting column 4.3 cooperates with the outward expansion component installation notch 6.31; after the wedge block connecting column 4.3 moves into the outward expansion component installation notch 6.31, there is a clearance fit between the top surface of the wedge block connecting bottom plate 4.2 and the bottom surface of the connecting block bottom plate 6.3, as well as between the bottom surface of the wedge block connecting top plate 4.4 and the top surface of the connecting block top plate 6.1.

[0020] When the wedge block 4 needs to be pressed down, first move the wedge block connection column 4.3 on the wedge block 4 into the expansion component installation notch 6.31 on the connection block 6, and then apply the downward pressure of the press head to the top surface of the connection block top plate 6.1 to press down the wedge block 4; When the wedge block 4 needs to be pulled out upward, first screw the screw part of the lifting screw 7 upward into the pressure head of the press, then drive the pressure head of the press to move the lifting screw 7 into the lifting screw installation notch 6.11, and finally drive the pressure head of the press to rise, and the wedge block 4 can be pulled out upward.

[0021] The cone plug 5 comprises a cone plug body 5.1, a cone plug connecting column 5.2 and a cone plug connecting top plate 5.3 which are fixed integrally from bottom to top; The width of the cone plug connection top plate 5.3 is greater than the width of the external expansion component installation notch 6.31. After the cone plug connection column 5.2 moves into the external expansion component installation notch 6.31, there is a clearance fit between the top surface of the cone plug body 5.1 and the bottom surface of the connection block bottom plate 6.3, as well as between the bottom surface of the cone plug connection top plate 5.3 and the top surface of the connection block top plate 6.1. When the cone plug 5 needs to be pressed down, first move the cone plug connection column 5.2 on the cone plug 5 into the expansion component installation notch 6.31 on the connection block 6, and then apply the downward pressure of the press head to the top surface of the connection block top plate 6.1 to press down the cone plug 5; When the cone plug 5 needs to be pulled out upward, first screw the screw part of the lifting screw 7 upward into the pressure head of the press, then drive the pressure head of the press to move the lifting screw 7 into the lifting screw installation notch 6.11, and finally drive the pressure head of the press to rise, so that the cone plug 5 can be pulled out upward.

[0022] The guide sleeve 1 in the present invention guides the valve seat 9 and the pressing block 2, thereby ensuring the relative position accuracy between the valve seat 9 and the valve body 8, and between the valve seat 9 and the pressing block 2, reducing unsafe factors, and effectively improving the assembly efficiency of the valve seat 9; The split support block assembly 3 and the cone plug 5 in the present invention squeeze the valve seat 9 twice. First, a press applies pressure to the wedge block 4 to make the split support block open outward, squeeze the valve seat 9 so that the valve seat 9 fits tightly with the inner cavity of the valve body 8. Then, a press applies pressure to the cone plug 5 to squeeze the valve seat 9 for a second time, so that the valve seat 9 further fits tightly with the inner cavity of the valve body 8, ensuring the sealing performance of the valve seat 9. The present invention uses the split support block assembly 3 and the cone plug 5 to squeeze the sealing area of ​​the valve seat 9 in a targeted manner, ensures the sealing performance of the valve seat 9, and effectively improves the assembly efficiency of the valve seat 9.

[0023] The connecting block 6 of the present invention adopts an open installation structure, which can reduce operations during the process of pressing and lifting the wedge block 4 and the cone plug 5, and can be quickly disassembled and assembled when replacing the wedge block 4 and the cone plug 5, effectively improving the assembly efficiency of the valve seat 9.

[0024] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A rapid assembly process for a plug valve seat, characterized in that The process includes the following steps: S1. Install the small end of the guide sleeve (1) on the flange of the plug valve body (8), wherein the guide sleeve (1) has a conical axial hole, and the diameter of the conical axial hole of the guide sleeve (1) is gradually reduced in a direction from top to bottom; S2. First, install the valve seat (9) from the top of the guide sleeve (1) into the conical shaft hole of the guide sleeve (1), then use the large head end of the pressing block (2) to press the valve seat (9) into the guide sleeve (1), and finally use the small head end of the pressing block (2) to press the valve seat (9) into the inner cavity of the valve body (8) of the plug valve; the pressing block (2) is a stepped cylindrical shape, the large head end of the pressing block (2) has a diameter larger than the upper end diameter of the valve seat (9), the small head end of the pressing block (2) has a diameter smaller than the lower end diameter of the conical shaft hole of the guide sleeve (1), and the small head end of the pressing block (2) and the lower end of the conical shaft hole of the guide sleeve (1) are in a clearance fit; S3, firstly, placing the split support block assembly (3) into the valve seat (9), the split support block assembly (3) being composed of two split support blocks, with a wedge-shaped groove (3.1) being provided between the two split support blocks, and then inserting the wedge-shaped block (4) into the wedge-shaped groove (3.1) between the two split support blocks, and pressing the wedge-shaped block (4) downward by external force, so that the split support block assembly (3) opens the valve seat (9), and then repeatedly lifting the wedge-shaped block (4), rotating the split support block assembly (3), and then pressing the wedge-shaped block (4) downward, so that the wedge-shaped groove (3.1) rotates 180 degrees, and the split support block assembly (3) is used to perform targeted extrusion on the sealing area of ​​the valve seat (9) to ensure the sealing performance of the valve seat (9), and finally lifting the wedge-shaped block (4) and removing the split support block assembly (3); S4. First, install the cone plug (5) in the valve seat (9), then press the cone plug (5) downward by external force so that the cone plug (5) opens the valve seat (9), and perform secondary extrusion on the valve seat (9) so that the valve seat (9) further fits tightly with the inner cavity of the valve body (8) to ensure the sealing performance of the valve seat (9). Finally, pull out the cone plug (5) to complete the rapid assembly process of the valve seat of the plug valve.

2. The rapid assembly process for the plug valve seat according to claim 1 is characterized in that: Step S3 and step S4 also use a connection block (6) and a lifting screw (7), wherein the connection block (6) comprises a connection block top plate (6.1), a connection block connecting side plate (6.2) and a connection block bottom plate (6.3) fixed integrally from top to bottom, a lifting screw mounting notch (6.11) is provided on the connection block top plate (6.1), and an external expansion component mounting notch (6.31) is provided on the connection block bottom plate (6.3); The width of the bolt head portion of the lifting screw (7) is greater than the width of the lifting screw installation notch (6.11), and the screw rod portion of the lifting screw (7) is clearance-matched with the lifting screw installation notch (6.11).

3. The rapid assembly process for the plug valve seat according to claim 2, characterized in that: The wedge block (4) comprises a wedge block body (4.1), a wedge block connecting bottom plate (4.2), a wedge block connecting column (4.3) and a wedge block connecting top plate (4.4) fixed integrally from bottom to top; The widths of the wedge block connecting bottom plate (4.2) and the wedge block connecting top plate (4.4) are both greater than the width of the external expansion component installation notch (6.31), and the wedge block connecting column (4.3) is matched with the external expansion component installation notch (6.31); after the wedge block connecting column (4.3) moves into the external expansion component installation notch (6.31), there is a clearance fit between the top surface of the wedge block connecting bottom plate (4.2) and the bottom surface of the connecting block bottom plate (6.3), and between the bottom surface of the wedge block connecting top plate (4.4) and the top surface of the connecting block top plate (6.1).

4. The rapid assembly process for the plug valve seat according to claim 3 is characterized by: When the wedge block (4) needs to be pressed down, the wedge block connecting column (4.3) on the wedge block (4) is first moved into the expansion component installation notch (6.31) on the connecting block (6), and then the downward pressure of the press head is applied to the top surface of the connecting block top plate (6.1), thereby pressing down the wedge block (4); When it is necessary to pull the wedge block (4) upward, first screw the screw part of the lifting screw (7) upward into the pressure head of the press, then drive the pressure head of the press to move the lifting screw (7) into the lifting screw installation notch (6.11), and finally drive the pressure head of the press to rise, so that the wedge block (4) can be pulled upward.

5. The rapid assembly process for the plug valve seat according to claim 2, characterized in that: The cone plug (5) comprises a cone plug body (5.1), a cone plug connecting column (5.2) and a cone plug connecting top plate (5.3) fixed integrally from bottom to top; The width of the cone plug connection top plate (5.3) is greater than the width of the external expansion component installation notch (6.31), and after the cone plug connection column (5.2) moves into the external expansion component installation notch (6.31), there is a clearance fit between the top surface of the cone plug body (5.1) and the bottom surface of the connection block bottom plate (6.3), as well as between the bottom surface of the cone plug connection top plate (5.3) and the top surface of the connection block top plate (6.1).

6. The rapid assembly process for the plug valve seat according to claim 5, characterized in that: When the cone plug (5) needs to be pressed down, the cone plug connecting column (5.2) on the cone plug (5) is first moved into the mounting notch (6.31) of the outer expansion component on the connecting block (6), and then the downward pressure of the pressing head of the press is applied to the top surface of the connecting block top plate (6.1), thereby pressing down the cone plug (5); When it is necessary to pull out the cone plug (5) upward, first screw the screw part of the lifting screw (7) upward into the pressure head of the press, then drive the pressure head of the press to move the lifting screw (7) into the lifting screw installation notch (6.11), and finally drive the pressure head of the press to rise, so that the cone plug (5) can be pulled out upward.

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