A ceramic gate valve

Abstract

The application relates to a ceramic gate valve, which comprises a valve body with an inlet and an outlet, a valve cover assembly arranged on the upper end of the valve body, a valve rod slidingly arranged in the valve cover assembly and provided with threads, a handle rotatingly arranged on the valve cover assembly and connected with the valve rod, the valve rod being driven to move along the vertical direction by rotating the handle, a gate plate clamped on the lower end of the valve rod, a valve seat sleeve slidingly arranged in the valve body and provided with a first U-shaped groove, the gate plate being slidingly arranged in the first U-shaped groove, a first valve seat arranged in the valve seat sleeve and capable of cooperating with the gate plate to block the ceramic gate valve, and a valve seat replacement unit arranged below the valve body, the valve seat sleeve being capable of moving into the valve seat replacement unit to replace the first valve seat with a second valve seat when the gate valve is kept in the closed state. The application has the advantages that the valve seat replacement unit can be used to quickly replace the valve seat, the valve seat can be quickly repaired, and the influence on the operation of the gate valve can be reduced.

Description

Technical Field

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

[0002] The gate valve's opening and closing element is a gate, and the gate's movement direction is perpendicular to the fluid direction. Gate valves belong to the sliding valve category and are mainly used in pipelines to cut off the medium, that is, to be used fully open or fully closed. They are generally not used for throttling. Knife gate valves are a type of gate valve. Currently, most knife gate valves use steel for the gate and seat, which has a lower surface hardness than ceramic. This makes them less wear-resistant and less resistant to erosion, easily corroded and damaged by fluid flow, leading to leakage. To address these issues, ceramic gate valves have been designed, replacing the seat with ceramic material to extend the valve's lifespan. However, existing ceramic knife gate valves require maintenance after a period of use. This involves removing and cleaning the ceramic seat and replacing it with a new one to ensure stable operation. Because the ceramic knife gate valve seat is an integral structure, and the gate is always positioned between the ceramic seat during operation, the valve must be removed from the pipeline, disassembled, and the seat removed. This process is labor-intensive and time-consuming, impacting the overall system's operation. Summary of the Invention

[0003] Therefore, it is necessary to provide a ceramic gate valve that allows for quick disassembly of the valve seat to address the aforementioned problems.

[0004] This invention discloses a ceramic gate valve, comprising: a valve body having an inlet and an outlet, with a valve cover assembly covering the upper end of the valve body; a valve stem slidably disposed within the valve cover assembly, the valve stem having threads; a handle rotatably disposed on the valve cover assembly and connected to the valve stem, the valve stem being able to move vertically by rotating the handle; a gate plate engaging with the lower end of the valve stem; a valve seat sleeve slidably disposed within the valve body, having a first U-shaped groove, the gate plate being slidably disposed within the first U-shaped groove; a first valve seat disposed within the valve seat sleeve and capable of cooperating with the gate plate to block the ceramic gate valve; and a valve seat replacement unit disposed below the valve body, the valve seat sleeve being able to move into the valve seat replacement unit when the gate valve is closed, replacing the first valve seat with a second valve seat.

[0005] In one embodiment, the valve seat replacement unit includes: a mounting cavity formed in the valve body, with a first end cap and a second end cap respectively provided at both ends of the mounting cavity; a second valve seat slidably disposed in the mounting cavity; a spring and a push plate, one end of the spring being connected to the first end cap and the other end being connected to the push plate, the push plate abutting against the second valve seat; and a locking assembly disposed in the valve body, capable of locking the push plate. The valve seat sleeve moves downward, capable of moving from a first working position to a second working position. When the gate moves to the second working position, the locking assembly unlocks, allowing the push plate to push the second valve seat to replace the first valve seat under the action of the spring.

[0006] In one embodiment, the locking assembly includes: an unlocking member disposed on the valve body and located below the valve seat sleeve, which can be pressed when the valve seat sleeve moves to the second working position; a locking block slidably disposed on the valve body, which can abut against the push plate to restrict the push plate from pushing the second valve seat; and a slider slidably disposed in the valve body, which is provided with an abutting inclined surface and an inclined groove. The lower end of the unlocking member abuts against the abutting inclined surface, and the locking block is slidably disposed in the inclined groove. When the unlocking member moves downward under the action of the first valve seat, it can drive the slider to slide, thereby driving the locking block to descend, so that the push plate is unlocked. The spring can drive the push plate and then drive the second valve seat to move, replacing the first valve seat on the valve seat sleeve.

[0007] In one embodiment, a screw is provided at the lower end of the valve body. The screw is rotatably connected to the lower end of the valve seat sleeve and threadedly connected to the valve body. By rotating the screw, the valve seat sleeve can be switched between a first working position and a second working position.

[0008] In one embodiment, the locking assembly further includes a first elastic element disposed in the valve body and abutting against the slider. When the valve seat sleeve moves upward, the slider can be reset under the action of the elastic element.

[0009] In one embodiment, the locking assembly further includes a second elastic member disposed within the valve body, the second elastic member abutting against the locking block, causing the locking block to protrude upward.

[0010] In one embodiment, a pull cord is provided between the first end cap and the push plate.

[0011] In one embodiment, the valve cover assembly includes a first valve cover and a second valve cover. The first valve cover is disposed on the valve body and has a clearance groove formed in the vertical direction. A limit block is fixedly disposed on the valve stem and is slidably disposed in the clearance groove, thereby restricting the rotation of the valve stem. The second valve cover is fixedly disposed on the upper end of the first valve cover and has a nut rotatably connected to the upper end of the second valve cover. The nut is fixedly connected to the handle and threadedly connected to the valve stem.

[0012] In one embodiment, the lower end of the first valve seat has a first guide slider, the lower end of the second valve seat has a second guide slider, the valve seat sleeve has a first guide groove, the lower side of the mounting cavity has a second guide groove, the second guide groove is connected to the first guide groove, the first guide slider is slidably connected in the first guide groove, the second guide slider is slidably connected in the second guide groove, when the locking block is separated from the push plate, the push plate can push the first guide slider to move into the second guide groove, and push the second guide slider to move into the first guide groove.

[0013] In one embodiment, the first valve seat and the second valve seat have the same structure, both having a through hole connecting the inlet and outlet and a second U-shaped groove. When the gate is fully inserted into the second U-shaped groove, the gate can block the through hole.

[0014] The advantages of this invention are:

[0015] 1. By setting a sliding valve seat sleeve in the valve body and sliding the ceramic valve seat inside the valve seat sleeve, when replacing the ceramic valve seat, the ceramic valve seat can be moved to the second working position by sliding the valve seat sleeve. The valve seat sleeve and the gate cooperate so that when the ceramic valve seat moves to the second working position, the valve seat sleeve can limit the gate, ensuring that the new ceramic valve seat can cooperate with the gate, making the replacement of the ceramic valve seat convenient, and the gate valve can still work well after replacement.

[0016] 2. By setting a sliding valve seat sleeve in the valve body and setting a push plate, when replacing the ceramic valve seat, simply slide the valve seat sleeve to drive the ceramic valve seat to the replacement position. The push plate can push the second valve seat into the valve seat sleeve, while the first valve seat is pushed out. Then, by controlling the valve seat sleeve to return to the first working position, the second valve seat can be pushed to the working position. At the same time, due to the sliding of the valve seat sleeve, when the valve seat sleeve is in the replacement position, the valve seat sleeve can cooperate with the gate to keep the gate valve closed. This invention enables online replacement of ceramic valve seats, which can achieve maintenance without affecting the operation of the gate valve.

[0017] 3. By setting a locking component, the gate valve locks the push plate when it is working normally. When the ceramic valve seat needs to be replaced, simply control the valve seat sleeve to move to the second working position to unlock the locking component, thereby unlocking the push plate. Then, through the spring, the second valve seat can be pushed to slide and move to the working position, realizing automatic replacement, which is quite convenient. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention;

[0019] Figure 2 For the present invention Figure 1 Sectional view along the AA direction;

[0020] Figure 3 This is a cross-sectional view of the ceramic valve seat during replacement according to the present invention.

[0021] Figure 4 For the present invention Figure 3 Sectional view along the BB direction;

[0022] Figure 5 For the present invention Figure 1 Enlarged view at point I;

[0023] Figure 6 This is a cross-sectional view of the ceramic valve seat of the present invention;

[0024] Figure 7 For the present invention Figure 6 Sectional view along the CC direction.

[0025] In the figure, the components are: valve body 1, inlet 11, outlet 12, first valve cover 21, clearance groove 211, second valve cover 22, first guide groove 13, valve stem 3, thread 31, limit block 32, handle 41, nut 411, gate 42, valve seat sleeve 43, first U-shaped groove 431, second guide groove 432, first valve seat 5, first guide slider 51, second U-shaped groove 52, valve seat replacement unit mounting cavity 61, first end cover 611, second end cover 612, second valve seat 62, second guide slider 621, spring 63, push plate 64, unlocking component 71, locking block 72, guide slope 721, slider 73, abutment slope 731, inclined groove 732, first elastic element 74, second elastic element 75, pull rope 76, and screw 8. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that when a component is said to be "attached" to another component, it can be directly on the other component or it can be in the middle of another component. When a component is said to be "set" to another component, it can be directly set to the other component or it may also be in the middle of another component. When a component is said to be "fixed" to another component, it can be directly fixed to the other component or it may also be in the middle of another component.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] like Figures 1 to 7 As shown, this invention discloses a ceramic gate valve, comprising: a valve body 1 having an inlet 11 and an outlet 12, with a valve cover assembly covering the upper end of the valve body 1; a valve stem 3 slidably disposed within the valve cover assembly, with a thread 31 on the valve stem 3; a handle 41 rotatably disposed on the valve cover assembly and connected to the valve stem 3, wherein rotating the handle 41 can drive the valve stem 3 to move vertically; a gate plate 42 engaging with the lower end of the valve stem 3; a valve seat sleeve 43 slidably disposed within the valve body 1, having a first U-shaped groove 431, with the gate plate 42 slidably disposed within the first U-shaped groove 431; a first valve seat 5 disposed within the valve seat sleeve 43 and capable of cooperating with the gate plate 42 to block the ceramic gate valve; and a valve seat replacement unit disposed below the valve body 1, wherein, when the gate valve is closed, the valve seat sleeve 43 can move into the valve seat replacement unit to replace the first valve seat 5 with a second valve seat 62.

[0030] Understandably, by setting up a valve seat replacement unit, the valve seat can be replaced without affecting the normal operation of the gate valve when it is closed, thereby reducing the impact on the normal operation of the pipeline and improving work efficiency.

[0031] Preferably, the valve seat replacement unit includes: a mounting cavity 61 formed within the valve body 1, with a first end cap 611 and a second end cap 612 respectively provided at both ends of the mounting cavity 61; a second valve seat 62 slidably disposed within the mounting cavity 61; a spring 63 and a push plate 64, one end of the spring 63 being connected to the first end cap 611 and the other end being connected to the push plate 64, the push plate 64 abutting against the second valve seat 62; and a locking assembly disposed within the valve body 1, capable of locking the push plate 64. The valve seat sleeve 43 moves downward, capable of moving from a first working position to a second working position. When the gate plate 42 moves to the second working position, the locking assembly unlocks, allowing the push plate 64 to push the second valve seat 62 to replace the first valve seat 5 under the action of the spring 63.

[0032] It is understandable that by setting a sliding valve seat sleeve 43 inside the valve body 1 and sliding the ceramic valve seat inside the valve seat sleeve 43, when replacing the ceramic valve seat, the ceramic valve seat can be moved to the second working position by sliding the valve seat sleeve 43. Furthermore, the valve seat sleeve 43 cooperates with the gate 42, so that when the ceramic valve seat moves to the second working position, the valve seat sleeve 43 can limit the gate 42, ensuring that the new ceramic valve seat can cooperate with the gate 42. This makes the replacement of the ceramic valve seat convenient, and the gate valve can still work well after replacement.

[0033] It is worth mentioning that by setting a sliding valve seat sleeve 43 inside the valve body 1 and setting a push plate 64, when replacing the ceramic valve seat, simply slide the valve seat sleeve 43 to drive the ceramic valve seat to the replacement position. The push plate 64 can push the second valve seat 62 into the valve seat sleeve 43, while the first valve seat 5 is pushed out. Then, by controlling the valve seat sleeve 43 to return to the first working position, the second valve seat 62 can be pushed to the working position. At the same time, due to the sliding of the valve seat sleeve 43, when the valve seat sleeve 43 is in the replacement position, the valve seat sleeve 43 can cooperate with the gate plate 42 to keep the gate valve closed. This invention enables online replacement of ceramic valve seats, achieving maintenance without affecting the operation of the gate valve.

[0034] Preferred, such as Figure 5As shown, the locking assembly includes: an unlocking member 71, disposed on the valve body 1 and located below the valve seat sleeve 43, which can press the unlocking member 71 when the valve seat sleeve 43 moves to the second working position; a locking block 72, slidably disposed on the valve body 1, which can abut against the push plate 64, thereby restricting the push plate 64 from pushing the second valve seat 62; and a slider 73, slidably disposed within the valve body 1, which is provided with an abutting inclined surface 731 and an inclined groove 732. The lower end of the unlocking member 71 abuts against the abutting inclined surface 731, and the locking block 72 is slidably disposed within the inclined groove 732. When the unlocking member 71 moves downward under the action of the first valve seat 5, it can drive the slider 73 to slide, thereby driving the locking block 72 to descend, so that the push plate 64 is unlocked. The spring 63 can drive the push plate 64 and then drive the second valve seat 62 to move, replacing the first valve seat 5 on the valve seat sleeve 43.

[0035] It should be noted that by setting a locking component, when the gate valve is working normally, the locking component locks the push plate 64. When the ceramic valve seat needs to be replaced, simply control the valve seat sleeve 43 to move to the second working position to unlock the locking component, thereby unlocking the push plate 64. Then, through the spring 63, the second valve seat 62 can be pushed to slide and move to the working position, realizing automatic replacement, which is quite convenient.

[0036] Preferably, the upper end of the locking block 72 is provided with a guide slope 721. When the push plate 64 moves to the left, it can push the locking block 72 downward by abutting the guide slope 721, so that the push plate 64 can smoothly pass over the locking block 72 and move to the left side of the locking block 72.

[0037] Preferably, a screw 8 is provided at the lower end of the valve body 1. The screw 8 is rotatably connected to the lower end of the valve seat sleeve 43 and threadedly connected to the valve body 1 31. By rotating the screw 8, the valve seat sleeve 43 can be switched between the first working position and the second working position.

[0038] Preferably, the locking assembly further includes a first elastic element 74, which is disposed inside the valve body 1 and abuts against the slider 73. When the valve seat sleeve 43 moves upward, the slider 73 can be reset under the action of the elastic element.

[0039] Preferably, the locking assembly further includes a second elastic member 75, which is disposed within the valve body 1 and abuts against the locking block 72, causing the locking block 72 to protrude upward.

[0040] Preferably, a pull rope 76 is provided between the first end cap 611 and the push plate 64.

[0041] Preferably, the valve cover assembly includes a first valve cover 21 and a second valve cover 22. The first valve cover 21 is disposed on the valve body 1. An clearance groove 211 is formed on the first valve cover 21 along the vertical direction. A limit block 32 is fixedly disposed on the valve stem 3. The limit block 32 is slidably disposed in the clearance groove 211, thereby restricting the rotation of the valve stem 3. The second valve cover 22 is fixedly disposed on the upper end of the first valve cover 21. A nut 411 is rotatably connected to the upper end of the second valve cover 22. The nut 411 is fixedly connected to the handle 41 and threadedly connected to the valve stem 3.

[0042] Preferred, combined Figure 7 As shown, the lower end of the first valve seat 5 has a first guide slider 51, and the lower end of the second valve seat 62 has a second guide slider 621. The valve seat sleeve 43 is provided with a first guide groove 13, and the lower side of the mounting cavity 61 is provided with a second guide groove 432. The second guide groove 432 is connected to the first guide groove 13. The first guide slider 51 is slidably connected in the first guide groove 13, and the second guide slider 621 is slidably connected in the second guide groove 432. When the locking block 72 is separated from the push plate 64, the push plate 64 can push the first guide slider 51 to move into the second guide groove 432 and push the second guide slider 621 to move into the first guide groove 13.

[0043] Preferred, such as Figure 6 and Figure 7 As shown, the first valve seat 5 and the second valve seat 62 have the same structure. Both are provided with a through hole connecting the inlet 11 and the outlet 12 and a second U-shaped groove 52. When the gate 42 is fully inserted into the second U-shaped groove 52, the gate 42 can block the through hole.

[0044] The working method of this invention is as follows: Figure 1 and Figure 2 As shown, the present invention is in the closed state at this time. When it is necessary to open the gate valve, simply turn the handle 41 to drive the nut 411 to rotate, thereby driving the gate plate 42 to move upward to open the gate valve. Reverse rotation of the handle 41 can cause the gate plate 42 to move downward to cut off the inlet 11 and the outlet 12.

[0045] When this invention requires maintenance after prolonged use, first rotate the handle 41 to lower the gate plate 42, closing the gate valve. Then rotate the screw 8. Since the screw 8 engages with the valve body 1's thread 31, it lowers the valve seat sleeve 43. Because the upper side of the valve seat sleeve 43 is a closed structure, it can still block the gate valve when it moves to the second working position. When the valve seat sleeve 43 moves to the second working position, as... Figure 3 and Figure 4 As shown, when the valve seat sleeve 43 presses down on the unlocking member 71, it causes the slider 73 to move to the left, which in turn causes the locking member to descend, so that the push plate 64 can move to the right under the action of the spring 63, pushing the second valve seat 62 and the first valve seat 5 to move to the right synchronously. When the second valve seat 62 moves to the initial position of the first valve seat 5, the first valve seat 5 abuts against the second end cover 612, thereby completing the replacement of the valve seat. Then, the screw 8 is rotated in the opposite direction, causing the valve seat sleeve 43 to move upward to the first working position.

[0046] Once the replacement is complete, the invention can be used normally. Then, open the second end cover 612, remove the first valve seat 5, clean and maintain it. If there is no major damage, it can be reused. Then, install the second end cover 612, and then open the first end cover 611. Pull the push plate 64 by pulling the pull rope 76. When the push plate 64 contacts the guide slope 721, the push plate 64, through the action of the guide slope 721, passes over the locking member and can be pulled out of the mounting cavity 61. Then, put the new ceramic valve seat into the mounting cavity 61 so that the new ceramic valve seat can be aligned with the first guide groove 13 on the valve seat sleeve 43. Then, put the push plate 64 into the mounting cavity 61, install the spring 63, and install the first end cover 611. At this time, the locking block 72 abuts against the right side of the push plate 64, so that the spring 63 is compressed, completing the installation of the valve seat replacement unit for future use.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A ceramic gate valve, characterized by, The ceramic gate valve includes: a valve body having an inlet and an outlet, with a valve cover assembly covering the upper end of the valve body; a valve stem slidably disposed within the valve cover assembly, the valve stem having threads; a handle rotatably disposed on the valve cover assembly and connected to the valve stem, the valve stem being able to move vertically by rotating the handle; a gate plate engaging with the lower end of the valve stem; a valve seat sleeve slidably disposed within the valve body, having a first U-shaped groove, the gate plate being slidably disposed within the first U-shaped groove; a first valve seat disposed within the valve seat sleeve and capable of cooperating with the gate plate to block the ceramic gate valve; and a valve seat replacement unit disposed below the valve body, the valve seat sleeve being able to move into the valve seat replacement unit when the gate valve is closed, replacing the first valve seat with a second valve seat. The valve seat replacement unit includes: a mounting cavity formed in the valve body, with a first end cap and a second end cap respectively provided at both ends of the mounting cavity; a second valve seat slidably disposed in the mounting cavity; a spring and a push plate, with one end of the spring connected to the first end cap and the other end connected to the push plate, the push plate abutting against the second valve seat; and a locking assembly disposed in the valve body, capable of locking the push plate. The valve seat sleeve moves downward, capable of moving from a first working position to a second working position. When the gate moves to the second working position, the locking assembly unlocks, allowing the push plate to push the second valve seat to replace the first valve seat under the action of the spring. The locking assembly includes: an unlocking member disposed on the valve body and located below the valve seat sleeve, which can be pressed when the valve seat sleeve moves to the second working position; a locking block slidably disposed on the valve body, which can abut against the push plate to restrict the push plate from pushing the second valve seat; and a slider slidably disposed in the valve body, which is provided with an abutting inclined surface and an inclined groove. The lower end of the unlocking member abuts against the abutting inclined surface, and the locking block is slidably disposed in the inclined groove. When the unlocking member moves downward under the action of the first valve seat, it can drive the slider to slide, thereby driving the locking block to descend, so that the push plate is unlocked. The spring can drive the push plate and then drive the second valve seat to move, replacing the first valve seat on the valve seat sleeve.

2. The ceramic gate valve according to claim 1, characterized in that, A screw is provided at the lower end of the valve body. The screw is rotatably connected to the lower end of the valve seat sleeve and threadedly connected to the valve body. By rotating the screw, the valve seat sleeve can be switched between a first working position and a second working position.

3. The ceramic gate valve according to claim 2, characterized in that, The locking assembly further includes a first elastic element disposed in the valve body and abutting against the slider. When the valve seat sleeve moves upward, the slider can be reset under the action of the elastic element.

4. The ceramic gate valve according to claim 2, characterized in that, The locking assembly further includes a second elastic element disposed within the valve body, which abuts against the locking block, causing the locking block to protrude upward.

5. The ceramic gate valve according to claim 1, characterized in that, A pull rope is provided between the first end cap and the push plate.

6. The ceramic gate valve according to claim 1, characterized in that, The valve cover assembly includes a first valve cover and a second valve cover. The first valve cover is disposed on the valve body and has a clearance groove formed in the vertical direction. A limit block is fixedly disposed on the valve stem and is slidably disposed in the clearance groove, thereby restricting the rotation of the valve stem. The second valve cover is fixedly disposed on the upper end of the first valve cover and has a nut rotatably connected to the upper end of the second valve cover. The nut is fixedly connected to the handle and threadedly connected to the valve stem.

7. The ceramic gate valve according to claim 2, characterized in that, The first valve seat has a first guide slider at its lower end, and the second valve seat has a second guide slider at its lower end. The valve seat sleeve has a first guide groove, and the mounting cavity has a second guide groove on its lower side. The second guide groove is connected to the first guide groove. The first guide slider is slidably connected in the first guide groove, and the second guide slider is slidably connected in the second guide groove. When the locking block is separated from the push plate, the push plate can push the first guide slider to move into the second guide groove and push the second guide slider to move into the first guide groove.

8. The ceramic gate valve according to claim 2, characterized in that, The first valve seat and the second valve seat have the same structure. Both are provided with a through hole connecting the inlet and the outlet and a second U-shaped groove. When the gate is fully inserted into the second U-shaped groove, the gate can block the through hole.

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