Lock of stop valve with conical bonnet

Abstract

The lock of the stop valve with the conical bonnet comprises an end socket, a chain lock and a pulling rivet, one end of the end socket comprises an open hole, the open hole is matched with the conical bonnet, and the open hole meets the conditions that d1 is smaller than d2, d1 is the diameter of the open hole, and d2 is the maximum value of the outer diameter of the conical bonnet; the side wall of the sealing head is fixed with a chain lock through a pulling rivet; the chain lock comprises a lock hole and a chain, the lock hole and the chain are used in cooperation, the chain can wind a valve body of the stop valve in the working process, and the lock is locked through the lock hole. According to the utility model, the safety and reliability of the maintenance operation of the stop valve are improved.

Description

Technical Field

[0001] This utility model relates to the field of tools, specifically to a lock for a stop valve with a conical valve cap. Background Technology

[0002] With the widespread use of ammonia pipelines in the chemical industry, ensuring the safety of maintenance personnel during the repair and maintenance of ammonia pipelines has become a crucial issue. In the high-risk process of ammonia pipeline maintenance, misoperation of valves can lead to ammonia leaks, posing a significant safety hazard to maintenance personnel.

[0003] In related technologies, warning signs are used to alert maintenance personnel, but this is not effective in preventing accidental operation by other personnel. To ensure the safety of maintenance personnel, designing a simple yet reliable locking device to prevent accidental valve opening has become a pressing technical challenge.

[0004] Currently, gate valves with conical caps typically do not have dedicated locking mechanisms (such as...). Figure 1 As shown, only warning signs are used to alert workers. However, warning signs cannot prevent accidental opening, especially in environments with multiple workers or significant external interference. While some universal locks exist on the market, most are not suitable for specific conical valve cap designs and cannot effectively secure the valve, leaving it at risk of accidental operation.

[0005] Therefore, how to effectively lock and control the cone-shaped valve cap shut-off valve, prevent the valve cap from being illegally rotated and opened, eliminate the risk of ammonia leakage, and ensure the safety of operators during maintenance has become an urgent technical problem to be solved. Utility Model Content

[0006] This invention provides a lock for a gate valve with a conical valve cap, which solves the problem in related technologies that gate valves with conical valve caps cannot be effectively locked and controlled, thus allowing them to be opened by accident and resulting in low security.

[0007] According to one aspect of the present invention, a lock for a stop valve with a conical valve cap is provided, characterized in that it comprises: a head, a chain lock, and rivets, wherein: one end of the head includes an opening, wherein the opening is adapted to the conical valve cap, and the opening satisfies: d1 < d2, where d1 is the opening diameter of the opening and d2 is the maximum value of the outer diameter of the conical valve cap; the sidewall of the head is fixed to the chain lock by the rivets; the chain lock comprises: a lock hole and a chain, the lock hole and the chain are used in conjunction, the chain can wrap around the valve body of the stop valve during operation, and lock the lock through the lock hole.

[0008] Preferably, the chain of the chain lock adopts a detachable locking structure, and the length of the chain lock is adjustable.

[0009] Preferably, the wall of the opening is provided with an annular silicone pad layer.

[0010] Preferably, the chain lock is provided with a padlock hole.

[0011] Preferably, the opening diameter of the opening satisfies: d < 5 mm, where d is the difference between d1 and d2.

[0012] Preferably, the end cap is made of polyvinyl chloride.

[0013] Preferably, the surface of the end cap is provided with a fluorescent warning layer.

[0014] Preferably, the edges of the opening are chamfered.

[0015] Preferably, the shank surface of the rivet is anodized.

[0016] This utility model provides a lock for a gate valve with a conical valve cap. Through a cap, chain lock, and rivets, the cap's opening design achieves an interference fit with the conical valve cap, forming an initial constraint. The chain lock's chain and lock hole work together to wrap around the valve body, adapting to the valve body's shape and generating a circumferential constraint force. The rivet connection ensures a rigid connection between the cap and the chain. These three structural features work synergistically, enabling the lock to resist both axial tension and tangential torsion, thus achieving the locking of the gate valve with the conical valve cap. This solves the problem in related technologies where gate valves with conical valve caps cannot be effectively locked, leading to accidental opening and low security, thereby improving the operational safety of the gate valve. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of a gate valve with a conical valve cap, based on relevant technologies;

[0019] Figure 2 This is a schematic diagram of a lock for a stop valve with a conical valve cap according to an embodiment of the present invention. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of a lock for a stop valve with a conical valve cap according to an embodiment of the present invention. Figure 2 .

[0021] Figure reference numerals: 1. End cap; 2. Chain lock; 3. Rivet; 21. Opening; 22. Lock hole; 23. Chain; 4. Padlock hole; 5. Conical valve cap. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] This embodiment provides a lock for a stop valve with a conical valve cap. Figure 2 This is a schematic diagram of a lock for a stop valve with a conical valve cap according to an embodiment of the present invention, as shown below. Figure 2 As shown, the locking device for the stop valve with a conical valve cap includes: a head 1, a chain lock 2, and rivets 3. One end of the head 1 includes an opening 21, which is adapted to the conical valve cap 5. The opening 21 satisfies the condition that d1 < d2, where d1 is the opening diameter of the opening 21 and d2 is the maximum value of the outer diameter of the conical valve cap. The side wall of the head 1 is fixed to the chain lock 2 by the rivets 3. The chain lock 2 includes: a locking hole 22 and a chain 23. The locking hole 22 and the chain 23 work together. The chain 23 can wrap around the valve body of the stop valve during operation and lock the device through the locking hole 22.

[0024] In related technologies, gate valves with conical caps typically lack dedicated locking mechanisms, relying instead on warning signs to alert operators. However, these warning signs are insufficient to prevent accidental opening, especially in environments with multiple workers or significant external interference. While some universal locking mechanisms exist, most are unsuitable for the specific conical cap design, failing to effectively secure the valve and thus remaining at risk of accidental operation.

[0025] The technical solution in this embodiment utilizes a cap 1, a chain lock 2, and rivets 3. The opening design of the cap achieves an interference fit with the conical valve cap, forming an initial constraint. The chain lock 2's chain 23 and lock hole 22 cooperate to wind around the valve body of the shut-off valve, adapting to the valve body's shape and generating a circumferential constraint force. The rivets 3 ensure a rigid connection between the cap 1 and the chain lock (e.g., ...). Figure 3 (As shown). These three structural features work together to enable the lock to resist both axial tension and tangential torsion, thereby achieving the locking of the gate valve with a conical valve cap. This solves the problem in related technologies where gate valves with conical valve caps cannot be effectively locked and controlled, leading to accidental opening and low security, thus improving the safety of the gate valve operation.

[0026] It should be noted that the rivet 3 used in implementation mainly consists of three parts: the rivet head, the rivet shank, and the collar. The rivet shank features an ingenious design, with a main ring groove that engages with the collar through deformation, as well as a pull rod with ring grooves throughout its length and a release groove. This clever design not only inherits the advantages of cold riveting rivets, such as convenient installation, low noise, and no pollution, but also significantly improves strength, anti-loosening properties, and corrosion resistance, ensuring the requirements for long service life and high-strength permanent connections. In addition, its optimized values ​​and range cover seven specifications of release groove diameter, ring groove tooth angle, and collar main ring groove fit clearance, further enhancing the product's performance and applicability.

[0027] Rivets, also known as HUCK bolts, are based on Hooke's Law in their fastening principle. When two parts are clamped together using specialized rivet equipment, the metal collar is compressed and fills the groove of the bolt, which has multiple annular grooves, achieving a tight and secure connection. This fastening method offers consistent fastening force and prevents loosening, making it widely used in steel structures for railway freight, bridges, and automobiles, especially in critical parts and key areas.

[0028] In terms of operation, the installation process of the rivets is simple and straightforward: first, insert one side of the rivet into the pre-drilled hole in the component; then, insert the rivet core into the head of the rivet gun and press it firmly against the end face of the rivet. Next, perform the riveting operation until the other side of the rivet expands and the rivet core breaks. Finally, after riveting, the fastening operation is complete. In this embodiment, rivets 3 are used to connect the side wall of the end cap 1 to the chain lock 2, improving the security of the connection and thus ensuring the effectiveness of the lock during operation.

[0029] In practice, the chain 23 of the chain lock 2 adopts a detachable locking structure, and the length of the chain lock 2 is adjustable.

[0030] In real-world industrial settings, the installation locations and environments of gate valves vary significantly. For example, some valves are installed in confined spaces; some have large diameters, deep end caps, and protruding flanges; and some pipelines are densely interwoven, making it impossible to completely wind them with a fixed-length chain lock. Under these diverse on-site conditions, if the chain lock's cable length is fixed, the following problems can easily arise: Chain lock too short: unable to wind around the valve, rendering the lock ineffective; Chain lock too long: not tight enough, allowing for loosening and negating its physical restraint function; Cumbersome on-site installation: fixed-length chains cannot quickly adapt to different valve bodies, increasing maintenance and installation workload and time.

[0031] In this preferred embodiment, the chain 23 of the chain lock 2 adopts a detachable locking structure; the length of the chain lock 2 is adjustable. Specifically, each node of the chain is designed with a pin or buckle, which can be manually installed and removed, allowing the user to decide how many chain links to use based on the actual site conditions; the locking part adopts a spring-loaded structure or an adjustable ring, allowing for flexible control of the locking length; both ends of the chain lock are connected to the lock hole via movable joints or pins to ensure that it will not loosen after length adjustment.

[0032] The detachable structure of this embodiment significantly improves the adaptability of the lock. This adjustable chain lock structure allows the same lock to be widely used in various models, sizes, and angled cone-shaped valve caps without needing to replace locks of different lengths. Secondly, it improves operational efficiency. Maintenance personnel only need to manually adjust the chain length according to the actual dimensions of the pipeline valve during on-site operations, eliminating the need to carry multiple locks of different specifications or additional extension accessories, greatly reducing installation complexity.

[0033] In practice, an annular silicone pad is provided on the wall of the opening 21. This annular silicone pad enhances the tightness of the engagement between the end cap 1 and the conical valve cap 5, improving the friction locking capability. On the other hand, it provides good buffering and sealing performance, improving the adaptability and service life of the lock under complex working conditions, while reducing structural wear and the risk of misoperation.

[0034] In the above embodiment, the end cap 1 covers the conical valve cap 5; the steel cable chain lock is wrapped and fixed in place; finally, the friction between the end cap 1 and the conical valve cap 5 achieves the purpose of limiting rotation and locking. In this structure, the opening 21 is the key interface for the contact, nesting, and clamping of the end cap 1 and the conical valve cap 5. If the edge of the opening 21 is not fine enough, or the material hardness is too high and it does not fit the conical surface, the following problems may easily occur: the mechanical gap is too large, and the end cap 1 becomes loose. The end cap 1 may easily fall off the conical valve cap 5 or still rotate slowly after the chain lock 2 is wrapped around it; effective friction cannot be formed: the material is in hard contact with the material, the sliding friction coefficient is low, resulting in an unstable locking state; poor sealing performance allows dust and liquid to enter: causing valve body contamination or lock corrosion failure.

[0035] In the specific implementation process, an annular silicone pad is added to the inner edge of the hole wall of the end cap opening 21. Its structure can be as follows: the silicone pad is 1-2mm thick and made of flexible material; the pad is fixed to the inner edge of the opening by heat bonding, slotting or embedded mold; it can adapt to the slight unevenness of the conical cap surface and deform to form a tight fit.

[0036] The technical solutions adopted in the above embodiments and their preferred embodiments can enhance the coefficient of friction and improve locking stability. Silicone is a material with a high coefficient of friction and strong flexible deformation capability. When in contact with PVC or metal conical valve caps, it can generate strong surface friction, unlike smooth plastics which are prone to slippage. Thus, even if the opening size of the end cap is slightly larger than the conical cap, a locking effect can be achieved through flexible fit and high frictional resistance. Secondly, the compressibility of silicone allows it to absorb a tolerance range of 2-3mm between the opening and the conical valve cap. This means that one end cap can fit various conical caps with diameters ± a few millimeters; the orifice control during manufacturing no longer requires extremely high precision, greatly simplifying the production process and reducing costs. In addition, it can improve protective sealing performance and prevent the intrusion of foreign objects. Conical valve caps are generally precision components and are often located in chemical pipelines and ammonia pipelines. If the sealing of the opening edge is poor, it may lead to: dust, liquid, and other contaminants entering the valve cap gaps; causing valve corrosion or jamming; and consequently causing the lock to misjudge the locked state but actually fail. The silicone pad can act as a sealing ring, providing a primary seal while locking the structure, preventing foreign objects from entering the interface area.

[0037] In practice, the chain lock 2 is equipped with a padlock hole 4. (See...) Figure 3 Padlock hole 4 can be used to install a safety lock. This technical feature improves the stability of the lock's locking effect, ensuring that the valve is always in a safe and unopenable state.

[0038] In implementation, the opening diameter of the opening 21 satisfies the condition: d < 5 mm, where d is the difference between d1 and d2. This technical feature achieves precise matching and improves the locking stability of the lock. Controlling the difference between the opening diameter and the valve cap diameter within 5 mm (d < 5 mm) ensures that the end cap 1 forms an approximately fitted state with the valve cap surface during installation. After the lock is fitted, it can be stably fixed on the valve cap surface, achieving a preliminary mechanical locking effect before the chain lock 2 is wound, providing basic support for subsequent friction locking and physical locking. Secondly, it improves the lock's engagement tightness, forming an effective contact area and resistance surface. Thirdly, it increases the coefficient of friction and enhances the locking force. A suitable clearance allows for compressive force between the end cap 1 and the conical valve cap 5, forming a static friction locking mechanism after the chain lock 2 is wound. This ensures that even with external vibration or slight human pulling, the conical valve cap 5 cannot be easily rotated or removed. It should also be noted that setting a clearance tolerance zone of less than 5mm as a standard allows for compatibility with most conical valve caps in the DN40-DN65 size range. This tolerance strategy ensures structural stability and simplifies the manufacturing process. It eliminates the need to customize different opening sizes for each valve cap model; the same opening size can accommodate conical caps of various diameters, reducing production costs and the number of spare parts required.

[0039] Preferably, the end cap 1 is made of polyvinyl chloride (PVC). The PVC material enhances the lock's resistance to corrosive gas environments and provides a good balance between structural rigidity and flexibility. It is suitable for rapid on-site drilling and mass injection molding, improving the lock's adaptability and long-term reliability. This material selection ensures that the lock does not degrade or break during long-term use in highly corrosive environments such as ammonia pipelines. Furthermore, it provides good rigidity and processing adaptability, facilitating rapid on-site installation, low-cost manufacturing, and replacement, significantly improving the overall safety, reliability, and cost-effectiveness of the lock.

[0040] During implementation, a fluorescent warning layer is provided on the surface of end cap 1. The fluorescent layer provides a visual warning in dark environments, which can improve the security of the lock.

[0041] In implementation, the edges of the opening 21 are chamfered. This chamfering in the preferred embodiment avoids the risk of scratches to workers during installation and disassembly due to sharp edges. This optimizes operational safety and reduces on-site installation accidents.

[0042] In a preferred embodiment, the shank surface of the rivet 3 is anodized. This treatment enhances the rivet's corrosion resistance.

[0043] The locking device for the cone-shaped valve cap stop valve provided in this embodiment and its preferred embodiment is suitable for locking the cone-shaped valve cap stop valve under different working conditions. During ammonia pipeline maintenance, it can solve the safety hazard caused by the inability to lock the valve, thereby improving the safety and reliability of the operation.

[0044] In practical use, the locking mechanism for the gate valve with the conical valve cap provided in this application, used at the ammonia valve operation site, can be implemented using the following steps:

[0045] First, close the shut-off valve using a conical valve cap, then screw the conical valve cap back onto the shut-off valve. Place the PVC end cap (cap) of the lock onto the conical valve cap (the diameter of the opening 21 of the end cap must be smaller than the maximum diameter of the conical valve cap; otherwise, it will not lock). Then, wrap the steel cable chain (chain) of the lock around the locked valve body, inserting the end of the chain 23 into the lock hole 22. Finally, install the safety lock on the padlock hole 4. In case of misoperation, after the chain lock 2 is tightened, the PVC end cap and the valve cap (conical valve cap) will generate friction, preventing the valve cap from rotating. Even if the valve cap can initially rotate, as the linear distance between the valve cap and the valve body increases, the valve cap will eventually lock and cannot be rotated off, thus opening the shut-off valve. This ensures safe and reliable operation and eliminates safety hazards caused by the inability to lock.

[0046] This embodiment and its preferred embodiments provide a dedicated locking device for conical valve caps, effectively preventing accidental opening of valves during ammonia pipeline maintenance. Existing technologies fail to provide an efficient and safe solution for locking valves, creating potential safety hazards. The technical solution of this application, through a locking device combining a PVC end cap and a steel cable chain lock (chain lock), eliminates the technological gap of being unable to lock gate valves with conical valve caps, preventing ammonia leakage due to misoperation of the gate valve during maintenance, thereby improving the safety and reliability of maintenance operations.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lockset having a stop valve with a tapered bonnet, characterized by, include: End caps, chain locks, and rivets, including: One end of the end cap includes an opening, wherein the opening is adapted to the conical valve cap, and the opening satisfies: d1 < d2, where d1 is the opening diameter of the opening and d2 is the maximum value of the outer diameter of the conical valve cap; The sidewall of the end cap is fixed to the chain lock by the rivets; The chain lock includes a lock hole and a chain, which are used together. The chain can wrap around the valve body of the shut-off valve during operation and lock the lock through the lock hole.

2. The lock according to claim 1, characterized in that, The chain lock uses a detachable locking mechanism, and the length of the chain lock is adjustable.

3. The lock according to claim 1, characterized in that, The hole wall is provided with an annular silicone pad layer.

4. The lock according to claim 1, characterized in that, The chain lock is provided with a padlock hole.

5. The lock according to claim 1, characterized in that, The opening diameter satisfies the following condition: d < 5 mm, where d is the difference between d1 and d2.

6. The lock according to any one of claims 1 to 5, characterized in that, The end cap is made of polyvinyl chloride.

7. The lock according to any one of claims 1 to 5, characterized in that, The surface of the end cap is provided with a fluorescent warning layer.

8. The lock according to any one of claims 1 to 5, characterized in that, The edges of the opening are chamfered.

9. The lock according to any one of claims 1 to 5, characterized in that, The shank surface of the rivet is anodized.

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