A device for quickly replacing a gate valve stem in the field

Abstract

The utility model belongs to valve technical field, concretely relates to a device of gate valve stem can be realized on -the -spot quick replacement, the valve cover is detachably connected with the valve body, the gate is set up inside the valve body, is used for realizing the opening and closing of gate valve, the square sleeve is fixedly connected with the gate, the lower end of lower valve stem is connected with the square sleeve, the hook is fixedly connected in the upper end of lower valve stem, the hook is equipped with the hook -up structure that cooperates with the lifting hook, one end of the lifting hook is fixedly connected with the lower end of upper valve stem, the buckle bolt is arranged in the lifting hook and the hook under the cooperation state. The nut is screwed with the lower end of locking threaded rod. The whole replacement process does not need to stop the machine and dismantle the core flow channel part, and the single maintenance time is shortened by more than 80% than the traditional mode, effectively reduces the yield loss caused by the equipment downtime, and significantly reduces the economic cost caused by the factory production interruption.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a device that enables quick replacement of gate valve stems on-site. Background Technology

[0002] Gate valves, as key equipment for controlling the flow of fluids in fluid transport systems, are widely used in industries such as petroleum, chemical, coal, and power. Their core function depends on the valve stem driving the gate to move up and down. As the core transmission component, the valve stem must withstand the scouring and pressure loads of the medium for a long time and is often in harsh working conditions containing corrosive components (such as acid and alkali media), coal tar, dust, and other impurities.

[0003] During long-term use, harsh operating conditions can easily lead to two major problems with the valve stem: First, the corrosive components in the medium, combined with oxygen in the air, cause the valve stem surface to rust, gradually damaging its transmission accuracy. Second, impurities such as coal tar and dust can easily accumulate in the gap between the valve stem and the packing, which not only increases the frictional resistance when the gate valve is opened and closed, but may also cause scratches and deformation on the valve stem surface during repeated operation, or even cause the valve stem to jam, directly affecting the normal operation of the gate valve.

[0004] However, the stem design of existing gate valves generally suffers from the drawback of "inconvenient maintenance": the stem of traditional gate valves is mostly an integral structure, or linked to the gate and drive device through a fixed connection method that cannot be quickly separated (such as welding or integral thread). When the valve stem needs to be replaced due to corrosion, deformation or damage, the gate valve must be "completely disassembled and reassembled". Specifically, it is necessary to disassemble the connecting flanges of the gate valve and the upstream and downstream pipelines in sequence, remove the fixing bolts of the valve cover and the valve body, take out the packing assembly in the valve body, separate the valve stem from the drive device, and even remove the entire gate from the valve body in order to replace the valve stem.

[0005] This traditional replacement method has significant drawbacks: 1. Long downtime: The disassembly and assembly of the machine is complicated, and a single maintenance often takes several hours or even longer, which forces the production system to shut down for a long time, resulting in direct production losses and economic losses to the factory. 2. High sealing risk: The valve cover and valve body connection structure need to be repeatedly disassembled during the disassembly and assembly process, which can easily damage the packing sealing layer in the valve body. If the sealing is not handled properly when reassembling after replacing the valve stem, it is very easy to cause media leakage, which not only increases the subsequent maintenance cost, but may also bring safety hazards. 3. High operational threshold: The disassembly and assembly of the whole machine requires professional technicians and special hoisting and disassembly tools, and has high requirements for on-site operating space, making it difficult to meet the needs of "rapid emergency maintenance" in industrial sites; 4. High maintenance costs: Frequent disassembly and assembly of the entire machine not only consumes a lot of manpower and material resources, but may also cause bumps and wear to non-vulnerable parts such as valve body and valve cover, shortening the overall service life of the gate valve.

[0006] In summary, the existing methods for replacing gate valve stems can no longer meet the industrial field's demand for "fast, convenient, and low-loss" maintenance. There is an urgent need for a technical solution that can enable rapid on-site replacement of valve stems to address the aforementioned shortcomings of traditional maintenance methods. Utility Model Content

[0007] In view of the technical problems existing in the valve stem of the above-mentioned gate valve, the present invention provides a device that enables quick replacement of the valve stem of the gate valve in the field.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A device for quickly replacing the valve stem of a gate valve on-site includes a valve body, a valve cover, a gate, a square sleeve, a lower valve stem, a hook, a lifting hook, a snap-fit ​​bolt, an upper valve stem, a locking threaded rod, and a nut. The valve cover is detachably connected to the valve body. The gate is disposed inside the valve body and is used to open and close the gate valve. The square sleeve is fixedly connected to the gate and is used to transmit the driving force of the valve stem. The lower end of the lower valve stem is connected to the square sleeve, and the axis of the lower valve stem is consistent with the movement direction of the gate. The hook is fixedly connected to the upper end of the lower valve stem and has a hooking structure that cooperates with the lifting hook. One end of the lifting hook is connected to the upper valve stem. The lower end is fixedly connected, and the other end of the hook can be detached from the hook's hook-and-hook structure to realize the power transmission or separation of the upper and lower valve stems; the snap bolt passes through the hook and hook in the mating state to lock and fix them together and prevent them from separating; the bottom of the valve body has a through hole, and the locking threaded rod can be inserted into the hole from the outside of the valve body, and after insertion, the upper end of the locking threaded rod can be threadedly connected to the lower end of the gate plate; the nut is threadedly engaged with the lower end of the locking threaded rod to lock and fix the locking threaded rod to the valve body after the locking threaded rod is connected to the gate plate, so as to support the gate plate.

[0009] It also includes a plug, which is detachably connected to a hole at the bottom of the valve body, and is used to seal the hole after the locking threaded rod is removed to prevent leakage of the medium inside the valve body.

[0010] It also includes a drive device, the upper end of which is connected to the drive device for driving the upper valve stem to move along the axial direction.

[0011] The hook is threaded to the lower end of the upper valve stem, and the threaded connection is provided with an anti-loosening structure.

[0012] The hook is threaded to the upper end of the lower valve stem, and the hook has a U-shaped groove for attaching. The mating end of the hook is a hook-shaped structure that fits the U-shaped groove.

[0013] The lower end of the lower valve stem is threaded to the square sleeve, and the square sleeve is fixed to the gate by bolts. The inner wall of the square sleeve is provided with an internal thread that is compatible with the lower valve stem.

[0014] The valve cover and the valve body are detachably connected by circumferentially distributed connecting bolts. The number of connecting bolts is not less than 4, and the spacing between adjacent connecting bolts satisfies the following condition: after some connecting bolts are removed, the valve cover can rotate 90° relative to the valve body around the upper valve stem axis.

[0015] The snap bolt is equipped with a snap nut, which is threaded to the snap bolt. An elastic washer is provided between the snap nut and the hook to enhance the anti-loosening effect after locking.

[0016] The inner wall of the hole at the bottom of the valve body is provided with an internal thread, and the plug is a threaded plug adapted to the internal thread, and a sealing gasket is provided on the contact surface between the plug and the valve body.

[0017] Compared with the prior art, the advantages of this utility model are: 1. This utility model features a detachable hook and latch structure, combined with the gate support function of the bottom locking threaded rod, completely eliminating the cumbersome process of disassembling the entire machine when replacing the valve stem in traditional gate valves. During replacement, simply loosen the connecting bolts between the valve cover and the valve body, rotate the valve cover 90°, and then remove the snap-fit ​​bolts to separate the upper and lower valve stems, quickly completing the replacement and reinstallation of the upper valve stem. The locking threaded rod stably supports the gate position, avoiding additional adjustment work caused by gate displacement during replacement. The entire replacement process does not require stopping the machine to disassemble core flow channel components, reducing single maintenance time by more than 80% compared to traditional methods. This effectively reduces production losses caused by equipment downtime and significantly lowers the economic costs caused by factory production interruptions, making it particularly suitable for fields with high requirements for production continuity, such as petroleum, chemical, and coal industries.

[0018] 2. When replacing the valve stem, this utility model allows the valve cover to be rotated rather than completely removed, preserving the sealing performance of the packing and valve stem to the greatest extent possible. Simultaneously, the through hole at the bottom of the valve body is sealed with a threaded plug and a sealing gasket after the threaded rod is removed, effectively preventing leakage of the medium from the bottom hole within the valve body. Furthermore, the hook and latch are secured with snap-fit ​​bolts, resulting in a small connection gap and reliable sealing, preventing medium seepage or leakage due to loose transmission structure, further ensuring the sealing performance of the gate valve and reducing safety hazards and maintenance costs caused by seal failure.

[0019] 3. The structural design of this utility model fully considers the convenience of on-site operation: the snap-fit ​​bolts enable quick locking or unlocking of the hook and the latch without the need for special disassembly tools; the locking threaded rod and the gate are connected by threads, and the gate can be quickly supported and unlocked with the help of nuts, making the operation steps clear and easy to understand. Compared with traditional replacement methods that require professional technicians, special hoisting equipment, and a large amount of manpower, ordinary maintenance personnel can independently complete the replacement work after simple training, which greatly reduces the maintenance operation threshold, reduces manpower input and technical dependence, and avoids component damage caused by complex operations.

[0020] 4. When replacing the valve stem, this utility model eliminates the need to remove the gate, disassemble the connection structure between the square sleeve and the gate, or dismantle the connection between the valve body and upstream / downstream pipelines. Only vulnerable components such as the valve stem and hook are operated on, maximizing the protection of the structural integrity and precision of core load-bearing and control components such as the valve body, gate, and square sleeve. Simultaneously, the threaded connection between the lower valve stem and the square sleeve is stable, and the cooperation between the hook and the latch avoids additional stress during valve stem transmission, reducing the risk of valve stem deformation and indirectly extending the service life of the lower valve stem and related components, thus lowering the overall maintenance and replacement costs of the gate valve. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an enlarged view of the hook and suspension hook of this utility model; Figure 3 This is an enlarged view of the locking threaded rod at the bottom of the valve of this utility model.

[0024] Wherein: 1 is nut, 2 is locking threaded rod, 3 is valve body, 4 is gate, 5 is square sleeve, 6 is lower valve stem, 7 is hook, 8 is lifting hook, 9 is snap bolt, 10 is upper valve stem, and 11 is valve cover. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. These descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the claims of this utility model. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] This embodiment provides a device that enables rapid on-site replacement of gate valve stems, such as... Figure 1-3 As shown, during normal operation, the drive unit is connected to the upper end of the upper valve stem 10, and the power output by the drive unit drives the upper valve stem 10 to move along its own axis. Since the lower end of the upper valve stem 10 is fixedly connected to the hook 8, and the hook 8 is connected to the hook 7 through the hook structure, and the snap bolt 9 passes through the hook 8 and hook 7 in the connected state and locks them in place, the moving power of the upper valve stem 10 can be stably transmitted to the hook 7. The hook 7 is fixedly connected to the upper end of the lower valve stem 6, and the lower end of the lower valve stem 6 is connected to the square sleeve 5. The square sleeve 5 is fixedly connected to the gate 4. Therefore, the power is transmitted to the gate 4 in sequence through the upper valve stem 10, hook 8, hook 7, lower valve stem 6, and square sleeve 5, and finally drives the gate 4 to move along the axis of the lower valve stem 6 inside the valve body 3, realizing the opening or closing of the gate valve. At the same time, the plug at the bottom of the valve body 3 is detachably connected to the through hole at the bottom of the valve body 3 to seal the hole, prevent the medium inside the valve body 3 from leaking, and ensure the sealed operation of the gate valve.

[0029] When the valve stem needs to be replaced on-site, first loosen the plug at the bottom of the valve body 3, and insert the locking threaded rod 2 through the through hole at the bottom of the valve body 3 from the outside, so that the upper end of the locking threaded rod 2 is threadedly connected to the lower end of the gate plate 4. Then, lock the locking threaded rod 2 to the valve body 3 through the nut 1 that mates with the thread at the lower end of the locking threaded rod 2. At this time, the locking threaded rod 2 provides stable support for the gate plate 4, preventing the gate plate 4 from shifting during subsequent operations. Then, loosen some of the connecting bolts between the valve body 3 and the valve cover 11 (because the valve cover 11 and the valve body 3 are detachably connected by circumferentially distributed connecting bolts, and the spacing between adjacent bolts meets the rotation requirements), rotate the valve cover 11 90° around the axis of the upper valve stem 10, and then loosen the snap bolt 9 to release the locking and fixing of the hook 8 and the hook 7. At this time, the valve cover 11, along with the upper valve stem 10 and the hook 8, can be removed to complete the removal of the old upper valve stem.

[0030] After replacing the upper valve stem, fix the new upper valve stem to the hook 8, and then hoist the valve cover 11, the new upper valve stem, and the hook 8 as a whole, so that the hook 8 and the hook 7 can be re-fitted through the hook structure. Then, insert the snap bolt 9 and lock it to realize the power transmission connection between the new upper valve stem and the lower valve stem 6. Then, turn the valve cover 11 back to the initial position, tighten the connecting bolt between the valve body 3 and the valve cover 11, then loosen the nut 1, rotate the locking thread rod 2 to disengage it from the gate plate 4, and remove the locking thread rod 2 from the bottom hole of the valve body 3. Finally, install the plug to seal the bottom hole of the valve body 3, and complete the quick on-site replacement of the valve stem. The whole process does not require the disassembly and assembly of the gate valve. The replacement operation is achieved only through the detachable and separable fit between the components.

[0031] The above description only describes the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model, and all such changes should be included within the protection scope of the present utility model.

Claims

1. A device for quickly replacing the valve stem of a gate valve on-site, characterized in that: The valve includes a valve body (3), a valve cover (11), a gate (4), a square sleeve (5), a lower valve stem (6), a hook (7), a lifting hook (8), a snap bolt (9), an upper valve stem (10), a locking threaded rod (2), and a nut (1). The valve cover (11) is detachably connected to the valve body (3). The gate (4) is located inside the valve body (3) and is used to open and close the gate valve. The square sleeve (5) is fixedly connected to the gate (4) and is used to transmit the valve stem driving force. The lower end of the lower valve stem (6) is connected to the square sleeve (5), and the axis of the lower valve stem (6) is consistent with the movement direction of the gate (4). The hook (7) is fixedly connected to the upper end of the lower valve stem (6), and the hook (7) is provided with a hooking structure that cooperates with the lifting hook (8). One end of the lifting hook (8) is connected to the upper valve stem (6). The lower end of the hook (8) is fixedly connected to the hook (7), and the other end of the hook (8) can be separated from the hook (7) to realize the power transmission or separation of the upper valve stem (10) and the lower valve stem (6); the buckle bolt (9) is inserted into the hook (8) and the hook (7) in the mating state to lock and fix the two to prevent relative separation; the bottom of the valve body (3) is provided with a through hole, and the locking thread rod (2) can be inserted into the hole from the outside of the valve body (3), and after insertion, the upper end of the locking thread rod (2) can be threadedly connected to the lower end of the gate plate (4); the nut (1) is threadedly engaged with the lower end of the locking thread rod (2) to lock and fix the locking thread rod (2) and the valve body (3) after the locking thread rod (2) is connected to the gate plate (4) to support the gate plate (4).

2. The device for quickly replacing the valve stem of a gate valve according to claim 1, characterized in that: It also includes a plug, which is detachably connected to a hole at the bottom of the valve body (3) and is used to seal the hole after the locking thread rod (2) is removed to prevent leakage of the medium inside the valve body (3).

3. The device for quickly replacing the valve stem of a gate valve according to claim 1, characterized in that: It also includes a drive device, the upper end of the upper valve stem (10) is connected to the drive device for transmission, and the drive device is used to drive the upper valve stem (10) to move along the axial direction.

4. The device for quickly replacing the valve stem of a gate valve according to claim 1, characterized in that: The hook (8) is threaded to the lower end of the upper valve stem (10), and the threaded connection is provided with an anti-loosening structure.

5. The device for quickly replacing the valve stem of a gate valve according to claim 1, characterized in that: The hook (7) is threaded to the upper end of the lower valve stem (6), and the hook (7) has a U-shaped groove for attaching. The hook (8) has a hook-shaped structure that is compatible with the U-shaped groove for mating.

6. The device for quickly replacing the valve stem of a gate valve according to claim 1, characterized in that: The lower end of the lower valve stem (6) is threaded to the square sleeve (5), and the square sleeve (5) is fixedly connected to the gate (4) by bolts. The inner wall of the square sleeve (5) is provided with an internal thread that is compatible with the lower valve stem (6).

7. The device for quickly replacing the valve stem of a gate valve according to claim 1, characterized in that: The valve cover (11) and the valve body (3) are detachably connected by circumferentially distributed connecting bolts. The number of connecting bolts is not less than 4, and the spacing between adjacent connecting bolts satisfies the following condition: after some connecting bolts are removed, the valve cover (11) can rotate 90° relative to the valve body (3) around the axis of the upper valve stem (10).

8. The device for quickly replacing the valve stem of a gate valve according to claim 1, characterized in that: The snap bolt (9) is equipped with a snap nut, which is threadedly engaged with the snap bolt (9). An elastic washer is provided between the snap nut and the hook (8) to enhance the anti-loosening effect after locking.

9. The device for quickly replacing the valve stem of a gate valve according to claim 2, characterized in that: The inner wall of the hole at the bottom of the valve body (3) is provided with an internal thread, the plug is a threaded plug that is adapted to the internal thread, and a sealing gasket is provided on the contact surface between the plug and the valve body (3).

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