A plug valve that can be replaced online

Abstract

The present invention discloses an online replaceable plug valve and a lifting device, comprising an upper assembly, a lower assembly, a pressure cover and a hand wheel; the upper assembly is installed in the lower assembly through the pressure cover, and the rotation of the plug valve is controlled by the hand wheel; when damaged, a new upper assembly is replaced by the lifting device to realize online maintenance of the plug valve. The lifting device is divided into a detachable first assembly and a second assembly to reduce the height of the lifting bracket of the second assembly, while reducing the stroke of the driver and reducing the cost of the lifting device; the first assembly and the second assembly as well as the first assembly and the plug valve are connected by a ferrule, which improves the convenience of assembly. A drain pipe is added to the first assembly to reduce the internal pressure of the pipeline when a new upper assembly is installed, which facilitates the installation of the upper assembly and discharges the liquid in the lifting device.

Description

Technical Field

[0001] The invention relates to a plug valve which can be replaced online. Background Art

[0002] A valve is a pipe accessory that is often used in urban water supply networks. When the valve is in use for a period of time, various faults may occur. The most common ones are valve leakage, transmission failure, poor valve opening and closing, etc. In the process of valve maintenance, it is often necessary to turn off the main valve of the main pipeline. Cut off the water source, manually open the manhole cover corresponding to the damaged valve, go underground manually, and then disassemble the valve for maintenance. Generally, it takes a long time to repair a valve, and it is common to take more than ten hours. In addition, cutting off the water source will affect the operation of the entire pipe network. How to quickly repair the damaged valve is crucial. Summary of the invention

[0003] In view of the defects of the above prior art, the main purpose of the present invention is to overcome the shortcomings of the prior art and disclose an online replaceable plug valve, comprising an upper assembly, a lower assembly, a gland and a hand wheel;

[0004] The lower assembly includes a valve body and a valve body bracket installed on the valve body, the valve body bracket is provided with an installation cavity allowing the upper assembly to pass through, and the gland is installed on the valve body bracket to install the upper assembly in the lower assembly;

[0005] The upper assembly includes a valve seat, a plug, a valve cover and a valve cover bracket. The plug is axially extended with a rotating shaft. The valve cover is connected to the valve seat to form a plug cavity for installing the plug. The plug is rotatably arranged in the plug cavity. The valve cover bracket is arranged on the valve cover. The valve cover bracket is axially provided with a through hole allowing the rotating shaft to pass through the through hole and protrude from the pressure cover. The handwheel is installed on the rotating shaft to drive the rotation.

[0006] Furthermore, an adjustment portion and a hook portion are provided at the upper end of the valve cover bracket, and the pressure cover is provided with a positioning portion cooperating with the adjustment portion to locate the installation position of the upper assembly, and the hook portion is used to lift the upper assembly.

[0007] Furthermore, the gland and the valve seat bracket are fixed by means of a movable bolt.

[0008] Furthermore, a limit pin is provided on the pressure cover, a guide groove is provided on the hand wheel, and the limit pin is placed in the guide groove to limit the rotation angle of the hand wheel.

[0009] A lifting device comprises a first assembly, a second assembly, a first connecting mechanism and a second connecting mechanism, wherein the second assembly is detachably mounted on the first assembly through the second connecting mechanism, and the first assembly is detachably mounted on a valve body bracket through the first connecting mechanism;

[0010] The first assembly is used to cut off and connect the second assembly with the stopcock;

[0011] The second assembly includes a driver, a lifting rod, a crossbeam, and a lifting bracket. The driver is symmetrically arranged on the sides of the lifting bracket. The crossbeam is connected to the drivers on both sides by fasteners. The lower end of the lifting rod is provided with a hanging part connected to the upper assembly of the plug valve, and the other end is detachably connected to the crossbeam. The driver is used to drive the lifting rod to move vertically.

[0012] Furthermore, the first assembly includes a knife gate valve.

[0013] Furthermore, the fastener includes a screw rod arranged on the driver and two nuts arranged on the screw rod and matched with the screw rod, and the end of the crossbeam rod is sleeved on the screw rod and located between the two nuts.

[0014] Further, the first connection mechanism comprises a first connection flange connected to the first assembly and a first ferrule arranged on the first connection flange, and the first ferrule is threadably matched with the plug valve;

[0015] The second connection mechanism includes a second connection flange connected to the first assembly and a second clamping sleeve arranged on the lifting bracket, and the second clamping sleeve is threadedly matched with the second connection flange.

[0016] Furthermore, one end of the first assembly connected to the stopcock is connected to a drain pipe and a stop valve.

[0017] Furthermore, the crossbeam rod comprises two support rods arranged in parallel and a connecting rod connecting the support rods and connected to the driver, and the lifting rod is connected to the support rods via a latch.

[0018] Beneficial effects achieved by the present invention:

[0019] The present invention divides the plug valve into an upper assembly and a lower assembly, and the lower assembly does not involve any wearing parts. During maintenance, the upper assembly can be quickly replaced to achieve maintenance of the plug valve. The removed upper assembly can be subsequently repaired without delaying the normal use of the plug valve. In addition, in conjunction with the lifting device, online replacement is achieved without affecting the normal use of the pipeline. Visible bolts are used to fix the valve body bracket and the pressure cover to determine the relative position of the pressure cover and the valve body bracket. At the same time, the positioning part cooperates with the adjustment part to quickly ensure the installation position of the upper assembly. The lifting device is divided into a detachable first assembly and a second assembly to reduce the height of the lifting bracket of the second assembly, while reducing the stroke of the driver and reducing the cost of the lifting device. It should be known that if the stroke is too long, the inner wall of the lifting bracket and the upper assembly have higher requirements for the degree of fit, which makes the manufacturing difficult and the cost high. The first assembly and the second assembly as well as the first assembly and the plug valve are connected by a ferrule, which improves the convenience of assembly. Only by matching the ferrule with the corresponding thread and tightening the ferrule, the first assembly and the second assembly as well as the first assembly and the plug valve will be aligned. A drain pipe is added to the first assembly to reduce the internal pressure of the pipeline when a new upper assembly is installed, making it easier to install the upper assembly and drain the liquid in the lifting device at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of an online replaceable plug valve of the present invention;

[0021] Figure 2 It is a cross-sectional view of a plug valve that can be replaced online according to the present invention;

[0022] Figure 3 is a schematic diagram of the three-dimensional structure of the lower assembly;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the upper assembly;

[0024] Figure 5 It is a cross-sectional view of the upper assembly;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the valve cover bracket;

[0026] Figure 7 for Figure 6 A top view of

[0027] Figure 8 for Figure 7 AA section view;

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the gland;

[0029] Fig.10A schematic diagram of the three-dimensional structure of the gland from another perspective;

[0030] Fig.11 It is a three-dimensional structural diagram of the hand wheel;

[0031] Fig.12 It is a schematic diagram of the connection structure between the valve seat and the valve cover;

[0032] Fig.13 for Fig.12 A magnified view of middle;

[0033] Fig.14 It is a schematic diagram of the connection between the lifting device and the plug valve;

[0034] Fig.15 It is a structural schematic diagram of a lifting device for an online replaceable plug valve of the present invention;

[0035] Fig.16 It is a schematic diagram of the connection structure between the fastener and the crossbeam;

[0036] The reference numerals are as follows:

[0037] 1. Lower assembly, 2. Upper assembly, 3. Gland, 4. Handwheel, 5. First assembly, 6. Second assembly, 7. First connecting mechanism, 8. Second connecting mechanism, 11. Valve body, 12. Valve body bracket, 13. Swivel bolt, 21. Valve seat, 22. Plug, 23. Valve cover, 24. Valve cover bracket, 25. Rotating shaft, 26. Plug cavity, 27. Sealing ring, 28. Sealing groove, 31. Positioning part, 32. Limit pin, 51. Drain pipe, 52. Stop valve, 6 1. Driver, 62. Lifting rod, 63. Crossbeam rod, 64. Lifting bracket, 65. Fastener, 71. First connecting flange, 72. First ferrule, 81. Second connecting flange, 82. Second ferrule, 211. First fixing hole, 231. Second fixing hole, 241. Adjustment part, 242. Hook part, 243. First cavity, 244. Second cavity, 621. Hanging part, 631. Support rod, 632. Connecting rod, 651. Screw, 652. Nut. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] A plug valve that can be replaced online, such as Figure 1-5 As shown, it includes an upper assembly 1, a lower assembly 2, a gland 3 and a hand wheel 4;

[0040] The lower assembly 1 includes a valve body 11 and a valve body bracket 12 installed on the valve body 11. The valve body 11 has a recessed accommodating cavity for installing the upper assembly 2 in the middle, and extends to both sides for the valve body flow channel for liquid to pass through; the valve body bracket 12 is cylindrical and is also used to install the upper assembly 2. The gland 3 is detachably installed on the valve body bracket 12, and the upper assembly 2 is installed in the accommodating cavity of the lower assembly 1. The gland 3 is connected by a hinge bolt 13; specifically, the hinge bolt 13 is symmetrical and valued on the side wall of the valve body bracket 12, and the gland 3 is inverted by the nut set on the hinge bolt 13 to fine-tune the upper and lower positions of the gland 3, thereby tightly restricting the upper assembly 2 in the lower assembly 1.

[0041] The upper assembly 2 includes a valve seat 21, a plug 22, a valve cover 23 and a valve cover bracket 24. The plug 22 is horizontally provided with a plug flow channel for liquid to pass through. The plug 22 is rotated so that the plug flow channel is flush with the valve body flow channel, and the plug valve is opened; when the plug flow channel of the plug 22 is perpendicular to the valve body flow channel, the plug valve is disconnected. The plug 22 is axially extended with a rotating shaft 25, and the rotation of the plug valve 22 is controlled by rotating the rotating shaft 25. The valve cover 23 is arranged on the valve seat 21 to form a plug cavity 26, and the valve cover 23 is provided with a first through hole allowing the rotating shaft 25 to pass through; the valve cover bracket 24 is arranged on the valve cover 23, and the valve cover bracket 24 is axially provided with a second through hole that penetrates and allows the rotating shaft 25 to pass through. The plug 22 is rotatably arranged in the plug cavity 26, and the rotating shaft 25 passes through the first through hole and the second through hole and protrudes from the valve cover bracket 24. In addition, a third through hole is provided on the pressure cover 3 , and the rotating shaft 25 passes through and protrudes from the third through hole. The hand wheel 4 is installed on the rotating shaft 25 , and the rotating shaft 25 drives the plug 22 to rotate by rotating the hand wheel 4 .

[0042] In one embodiment, if Figure 6-10 As shown, the upper end of the valve cover bracket 24 is provided with an adjustment portion 241 and a hook portion 242, and the gland 3 is provided with a positioning portion 31 that cooperates with the adjustment portion 241; the valve seat 21 plays a sealing role between the plug 22 and the valve body 11, so a through hole corresponding to the valve body flow channel is provided on the valve seat 21, so when the upper assembly 2 is installed, the installation direction of the upper assembly 2 is fixed, and the relative position of the gland 3 and the valve body bracket 12 is fixed during installation, so the upper assembly 2 can be installed in place through the adjustment portion 241 and the positioning portion 31; otherwise, the gland 3 cannot be installed smoothly. The hook portion 242 is used to lift the upper assembly 2. In the above embodiment, the upper end surface of the valve cover bracket 24 is concavely provided with a first cavity 243 and a second cavity 244, the second cavity 244 is cylindrical, the first cavity 243 is a long strip groove provided on the second cavity 244, wherein the adjustment portion 241 is a side plane of the first cavity 243, and the hook portion 242 is a horizontal interface between the second cavity 244 and the first cavity 243. The positioning portion 31 is a convex block provided downward at the bottom of the gland 3.

[0043] In one embodiment, if Figure 9-11 As shown, a limit pin 32 is provided on the gland 3, and a guide groove 41 is provided on the hand wheel 4. The limit pin 32 is placed in the guide groove 41 to limit the rotation angle of the hand wheel. Usually, the guide groove 41 is an arc-shaped guide groove and is concentric with the rotation center of the hand wheel 4.

[0044] In one embodiment, if Figure 12-13 As shown, a plurality of first fixing holes 211 (bright holes) are provided on the side wall of the upper end of the valve seat 21, and second fixing holes 231 (screw holes) matching the first fixing holes 211 are provided at corresponding positions of the valve cover 23. The upper end portion of the valve seat 21 is sleeved on the valve cover 23 so that the first fixing holes 211 are aligned with the second fixing holes 231. The first fixing holes 211 and the second fixing holes 231 are connected by fixing screws to realize the connection between the valve cover 23 and the valve seat 21.

[0045] In one embodiment, if Figure 1-8 As shown, in order to improve the sealing performance between the upper assembly 2 and the valve body bracket 12, the valve cover bracket 24 has the same outer diameter as the valve cover 23 and matches the inner diameter of the valve body bracket 12. Preferably, the side wall of the valve cover 23 is recessed with an annular sealing groove 28, and the sealing ring 27 is arranged in the sealing groove 28. The side wall of the valve cover bracket 24 is also recessed with an annular sealing groove 28, and the sealing ring 27 is arranged in the sealing groove 28. Preferably, at least two sealing grooves 28 are arranged in parallel on the valve cover 23 and the valve cover bracket 24.

[0046] The plug valve is divided into an upper assembly 2 and a lower assembly 1. The lower assembly 1 adopts the simplest structure and is usually not damaged. Some wearing parts are assembled in the upper assembly 2. By directly replacing the assembly 2, the plug valve can be replaced online.

[0047] The present invention also provides a lifting device for an online replaceable plug valve, such as Figure 14-15 As shown, it includes a first assembly body 5, a second assembly body 6, a first connecting mechanism 7 and a second connecting mechanism 8, the second assembly body 6 is detachably mounted on the first assembly body 5 through the second connecting mechanism 8, and the first assembly body 5 is detachably mounted on the valve body bracket 12 through the first connecting mechanism 7;

[0048] The first assembly 5 is used to cut off and connect the second assembly 6 and the plug valve; preferably, the first assembly 5 includes a knife gate valve.

[0049] The second assembly 6 includes a driver 61, a lifting rod 62, a crossbeam 63, and a lifting bracket 64. The lifting bracket 64 is a cylindrical structure. The driver 61 can be a hydraulic device, including but not limited to an oil cylinder; at least two oil cylinders are provided, symmetrically arranged on the side of the lifting bracket 64, and the crossbeam 63 is connected to the drivers on both sides through fasteners 65, that is, the piston rod of the hydraulic device. The lower end of the lifting rod 62 protrudes to both sides to set a hanging part 621, and the other end is detachably connected to the crossbeam 63. The driver 61 drives the lifting rod 62 to move, and then lifts the upper assembly 2 and separates it from the lower assembly 1. When in use, the lifting rod 62 is separated from the crossbeam 63, and its lower end enters the second cavity 244 through the first cavity 243 and rotates 90°, so that the hanging part 621 cooperates with the hook part 242 to lock, and then the upper end of the lifting rod 62 is connected to the crossbeam 63. In order to prevent the liquid in the pipeline from overflowing along the gap between the upper assembly 2 and the lifting bracket 64 when the upper assembly 2 is removed, the inner diameter of the lifting bracket 64 matches the upper assembly 2, that is, matches the inner diameter of the valve cover bracket 24.

[0050] In one embodiment, if Figure 14-16 As shown, the fastener 65 includes a screw rod 651 disposed on the driver 61 and two nuts 652 disposed on and matched with the screw rod 651. The end of the crossbeam 63 is sleeved on the screw rod 651 and located between the two nuts 652. The height position of the crossbeam 63 is adjusted by rotating the nuts 652, so that the crossbeam 63 is conveniently connected to the lifting crossbar 62.

[0051] In one embodiment, if Figure 14-16 As shown, the crossbeam rod 63 includes two support rods 631 arranged in parallel and a connecting rod 632 connecting the support rods 631 and connected to the driver 61 , and the lifting rod 62 is connected to the support rods 631 via a latch.

[0052] In one embodiment, if Figure 14-15 As shown, the first connecting mechanism 7 includes a first connecting flange 71 connected to the first assembly body 5 and a first ferrule 73 arranged on the first connecting flange 72, and the first ferrule 73 cooperates with the plug valve thread; that is, an external thread is arranged on the valve body bracket 12 of the plug valve, and the first ferrule 73 is provided with an internal thread that cooperates with the external thread; in this way, it is only necessary to buckle the first connecting flange 72 on the valve body bracket 24, and rotate the first ferrule 73 to connect the first assembly body 5 with the plug valve.

[0053] The second connection mechanism 8 includes a second connection flange 81 connected to the first assembly 5 and a second ferrule 82 disposed on the lifting bracket 64, and the second ferrule 82 is threadedly matched with the second connection flange 81. Similarly, the assembly between the first assembly 5 and the second assembly 6 can be realized conveniently and quickly.

[0054] In one embodiment, if Figure 14-15 As shown, a drain pipe 51 and a stop valve 52 are provided at one end of the first assembly 5 connected to the stopcock. Specifically, the drain pipe 51 is connected to the first connection method flange 71, and the stop valve 52 is used to control the opening and closing of the drain pipe 51. When the upper assembly 2 is taken out, the stop valve 52 is in a closed state. When the lifting device lifts the upper assembly 2 to a level higher than the first assembly 5, the knife gate valve is closed. At this time, the two sides of the lower assembly 1 are connected to the pipelines, so that there is no need to cut off the main pipeline during maintenance. When the new upper assembly 2 is installed, the stop valve 52 is opened, so that part of the liquid in the valve body 11 flows out from the drain pipe 51 to reduce the internal pressure of the valve body 11, so as to facilitate the installation of the upper assembly 2 and avoid high pressure from damaging the sealing ring 27 on the upper assembly 2.

[0055] When the present invention is used, Figure 1-16 As shown, when the plug valve fails, perform the following steps:

[0056] Step 1, remove the hand wheel 4, loosen the swing bolt 13, and open the gland 3;

[0057] Step 2, install the first assembly 5, align the first connecting flange 71 with the valve body bracket 12, and rotate the first ferrule 72 to connect the first assembly 5 with the valve body bracket 12. Then install the second assembly 6, align the second connecting flange 81 of the lifting bracket 64, and rotate the second ferrule 82 to connect the second assembly 6 with the first assembly 5.

[0058] Step 3, connect the upper assembly 2, separate the lifting rod 62 from the crossbeam 63, insert the lifting rod 62 into the second cavity 244, and rotate it 90° so that the hook part 242 is locked with the hanging part 621, and then rotate the nut 652 to adjust the height position of the crossbeam 63 so that the fixing hole of the lifting rod 62 is aligned with the fixing hole on the crossbeam 63, and insert the pin for connection.

[0059] Step 4, remove the upper assembly, start the driver 61, control the lifting rod 62 to drive the upper assembly 2 to move up slowly. When the bottom of the upper assembly 2 is lifted to exceed the knife gate valve, close the knife gate valve to isolate the liquid in the pipeline. At this time, remove the second ferrule 82 to separate the second assembly 6 from the first assembly 5; then lower the lifting rod 62 through the driver 61 to make the upper assembly 2 protrude from the lifting bracket 64, rotate the upper assembly 2 to separate the hook part 242 from the hanging part 621, and take out the upper assembly 2.

[0060] Step 5, install the new upper assembly 2, connect the new upper assembly 2 to the lifting rod 62, and then start the driver 61 to make the upper assembly 2 enter the lifting bracket 62, and then connect the second assembly 6 to the first assembly 1, open the knife gate valve to the fully open state, and open the stop valve 52, and push the upper assembly 2 through the first assembly 5 and then enter the lower assembly 1 through the driver 61 to complete the installation and remove the first assembly 5 and the second assembly 6.

[0061] Step 6, install the pressure cover 3 and the hand wheel 4, rotate the upper assembly 2 to adjust its position so that the positioning part 31 cooperates with the adjustment part 241, cover the pressure cover 3 on the valve body bracket 12, and fix it with the movable bolt 13 to complete the online replacement of the plug valve; finally, cover the well cover.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, they should all be included in the protection scope of the claims of the present invention.

Claims

1. A plug valve that can be replaced online, characterized in that: Including upper assembly, lower assembly, gland and hand wheel; The lower assembly includes a valve body and a valve body bracket installed on the valve body, the valve body bracket is provided with an installation cavity allowing the upper assembly to pass through, and the gland is installed on the valve body bracket to install the upper assembly in the lower assembly; The upper assembly includes a valve seat, a plug, a valve cover and a valve cover bracket. The plug is axially extended to form a rotating shaft. The valve cover is connected to the valve seat to form a plug cavity for installing the plug. The plug is rotatably arranged in the plug cavity. The valve cover bracket is arranged on the valve cover. The valve cover bracket is axially provided with a through hole allowing the rotating shaft to pass through. The rotating shaft passes through the through hole and protrudes from the gland. The hand wheel is installed on the rotating shaft to drive the plug to rotate. An adjusting portion and a hanging buckle portion are provided at the upper end of the valve cover bracket, and the gland is provided with a positioning portion cooperating with the adjusting portion to locate the installation position of the upper assembly, and the hanging buckle portion is used to lift the upper assembly; A plurality of first fixing holes are arranged on the side wall of the upper end of the valve seat, and second fixing holes matching with the first fixing holes are arranged at corresponding positions of the valve cover. The upper end portion of the valve seat is sleeved on the valve cover so that the first fixing holes are aligned with the second fixing holes. The first fixing holes and the second fixing holes are connected by fixing screws to realize the connection between the valve cover and the valve seat.

2. The plug valve that can be replaced online according to claim 1 is characterized in that: The gland and the valve body bracket are fixed by means of a hinge bolt.

3. The plug valve that can be replaced online according to claim 1 is characterized in that: A limit pin is arranged on the pressure cover, a guide groove is arranged on the hand wheel, and the limit pin is placed in the guide groove to limit the rotation angle of the hand wheel.

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