Mechanical encryption valve

Abstract

The present application relates to the technical field of valve, in particular to a mechanical encryption valve, including valve body, valve cover arranged on the valve body, valve rod arranged on the valve cover and located in the valve body, valve flap arranged on the valve body and threaded with the lower end of the valve rod, the valve flap is lifted in the valve body when the valve rod rotates, the upper end of the valve rod passes through the valve cover, further including rotating body, avoiding hole, first cutout, longitudinal opening, second cutout, control rod, turnover mechanism, locking mechanism, the control rod and the rotating body are integrated, the traditional use of lock core and key is abandoned, the control rod itself is both unlocking tool and operating handle, the management personnel do not need to carry unique key, and the phenomenon that the valve cannot be operated due to the loss of key will not occur, so as to reduce the loss, when the subsequent operation is needed again, the first cutout and the second cutout are corresponded by controlling the rotating body, and the above control mode is repeated.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and specifically to a mechanical encryption valve. Background Technology

[0002] Valves are control components widely used in pipeline transportation systems. Their basic function is to cut off or regulate the flow of media. A drive mechanism moves the valve core within the valve body, changing the flow area at the valve orifice, thereby achieving opening, closing, or throttling control. In industrial pipelines such as water supply, heating, gas supply, and petrochemicals, as well as in civil facilities, valves are key equipment for ensuring the safe operation of the system and achieving fluid parameter regulation.

[0003] However, with the increasing complexity of pipeline systems, the issue of valve operation access management has become increasingly prominent. Particularly in the fields of water supply, heating, and fuel oil transportation, there are instances of unauthorized unauthorized openings into main pipelines to connect to other systems, stealing water, heat, or fuel. Traditional ordinary valves can be operated with common tools, making it impossible to physically restrict operation access and effectively prevent these illegal activities. Therefore, the industry has raised the need for "encrypted valves."

[0004] An encrypted valve is a special type of valve that adds a dedicated opening permission restriction mechanism to a regular valve. Its core feature is that the operator must unlock the valve using specific tools or logical actions before they can open, close, or regulate it. This design aims to restrict valve operation to specific professionals, thereby deterring misuse and protecting energy and public safety.

[0005] Currently, many encrypted valves on the market use a simple combination of lock cylinder and key. However, this encryption structure requires a separate key. In complex environments such as outdoor valve wells and field pipelines, it is very easy for managers to lose the special key they carry. Once the key is lost, the valve will be unable to operate, resulting in the valve not being able to be opened or closed in time, thus causing losses. Summary of the Invention

[0006] The purpose of this invention is to provide a mechanical encryption valve that addresses the shortcomings and deficiencies of existing technologies.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a mechanical encryption valve, comprising a valve body, a valve cover disposed on the valve body, a valve stem rotatably disposed on the valve cover and with its lower end located within the valve body, a valve disc disposed on the valve body and threadedly connected to the lower end of the valve stem for moving up and down within the valve body when the valve stem rotates, the upper end of the valve stem extending through the valve cover, and further comprising a rotating body, a clearance hole, a first cut, a longitudinal opening, a second cut, a control lever, a flipping mechanism, and a locking mechanism;

[0008] The rotating body is rotatably mounted on the upper end of the valve cover, and the clearance hole is longitudinally opened through the rotating body, with the clearance hole and valve stem having a clearance fit.

[0009] The first slit is opened laterally on the upper end face of the valve stem, the second slit is opened at the upper end of the rotating body and is connected to the clearance hole and the longitudinal opening, and the longitudinal opening is opened longitudinally on the rotating body;

[0010] The control lever is raised and lowered within the longitudinal opening, and is used to rise or fall within the longitudinal opening when the control lever is in the longitudinal state and is pulled by an external force. The control lever is in clearance fit with the first cut and the second cut.

[0011] The flipping mechanism is located between the rotating body and the control lever and is located in the longitudinal opening. The flipping mechanism is used to allow the control lever to flip to the lateral state and lock into the first and second cuts after the first cut and the second cut are in the rising state, or to allow the control lever to flip to the longitudinal state and descend from the longitudinal opening when the control lever is in the rising state.

[0012] The locking mechanism is located between the rotating body and the control lever. The locking mechanism is used to lock or unlock the control lever in the longitudinal opening after the control lever is flipped to the longitudinal position and descends from the longitudinal opening.

[0013] A further improvement is that the flipping mechanism includes a fixed rod disposed on the rotating body within a longitudinal opening, and a sliding waist hole disposed on the control rod and in clearance fit with the fixed rod, the sliding waist hole being disposed along the length direction of the control rod.

[0014] Further effects: When the control lever is pulled upwards, the fixed rod changes position in the sliding waist hole until the control lever rises to the tail of the sliding waist hole and abuts against the fixed rod, thus restricting the rise of the control lever. At this point, the operator only needs to flip the control lever to the right to achieve the lateral state flipping, which not only serves as a limit to the rise and flipping function, but also serves as a flipping reminder to the operator; when the control lever is flipped to the longitudinal state, the descent of the control lever in the longitudinal opening will not affect the interference of the fixed rod on the control lever.

[0015] A further improvement is that the locking mechanism includes a side opening on the side end face of the rotating body and connected to the longitudinal opening, a corresponding opening on the side end face of the control lever for descending from the longitudinal opening after the control lever is flipped to the longitudinal state, and a limiting block slidably disposed on the rotating body and located in the side opening for engaging in the corresponding opening to limit the rise of the control lever when the corresponding opening and the side opening are aligned.

[0016] A further improvement is that the corresponding opening is an arc-shaped hole, and the limiting block includes a sliding block slidably disposed on the rotating body and located in the side opening, a limiting circular block disposed on the right end face of the sliding block for engaging and fixing with the corresponding opening, a chamfered surface disposed on the control lever and connected to the corresponding opening for facilitating the limiting circular block to engage in the corresponding opening, a pushing block disposed on the left end face of the sliding block, and a groove disposed on the pushing block.

[0017] Further effects: After the control lever is flipped to the longitudinal position and descends from the longitudinal opening, and the corresponding opening corresponds to the side opening, push the sliding block into the side opening and press it against the push block to the right with a tool, causing the sliding block to move to the right until the limiting block is engaged in the corresponding opening through the chamfered surface. The arc shape of the corresponding opening and the circular shape of the limiting block form a locking state. If it is necessary to release the locking state between the limiting block and the corresponding opening, insert the tool into the groove and pull the sliding block to the left to pull the limiting block out of the corresponding opening through the chamfered surface, thereby releasing the control lever from rising in the longitudinal opening.

[0018] A further improvement is that a protective sleeve is fitted onto the upper end of the rotating body, and the protective sleeve is fitted with the rotating body through an inner cavity. The protective sleeve has a clearance hole for the control lever to pass through the protective sleeve when it is fitted onto the rotating body.

[0019] Further benefits: The protective sleeve can seal the first and second cuts, reducing the risk of non-professionals using tools to drive the valve stem rotation by wedging them in the first cut.

[0020] Further enhancements: When the limiting block is locked into the corresponding opening, the protective sleeve is installed on the rotating body to cover the side opening, preventing others from directly controlling the limiting block. This layered protection design makes it exponentially more difficult to crack, significantly improving the ability to prevent damage and unauthorized operation, thus creating a further encrypted state.

[0021] A further improvement is that the left end face of the push block is provided with an inclined driving surface, which is used to contact the protective sleeve when the protective sleeve is inserted into the rotating body, thereby driving the push block to drive the limiting circle block into the corresponding opening.

[0022] Further benefits: Before inserting the protective sleeve into the rotating body, the sliding block can be pushed in from the side opening until the limiting block abuts against the chamfered surface of the control lever. Then, the protective sleeve is inserted downwards from the rotating body. During the downward insertion, the inclined drive surface presses against the protective sleeve, causing the pushing block to gradually move the sliding block closer to the control lever within the side opening as the protective sleeve is inserted, until the limiting block on the right is engaged in the corresponding opening. This eliminates the need for external force to press the pushing block to engage the limiting block, reducing the complexity of the locking process and preventing the valve from being properly locked due to forgetting to manually push the limiting block. Furthermore, removing the protective sleeve requires a special tool to hook the groove, further increasing the difficulty of unauthorized opening and achieving the effect of automatically locking the control lever after the protective sleeve is installed. When removing the protective sleeve from the rotating body, the groove still allows the tool to hook the pushing block, pulling the sliding block outwards and causing the limiting block to separate from the corresponding opening.

[0023] A further improvement is that the lower end of the rotating body is provided with a mounting opening, and a connecting bearing is provided between the lower end of the rotating body and the upper end of the valve cover, with the connecting bearing located in the mounting opening.

[0024] After adopting the above technical solution, the beneficial effects of this invention are as follows: In this application, the valve is encrypted through the mechanical control of multiple components. When it is necessary to control the opening and closing of the valve, the locking mechanism releases the control lever from the longitudinal opening, and then pulls the control lever upwards to put it in an ascending state. The flipping mechanism flips the control lever to a lateral state, where it engages with the first and second cuts. At this time, the control lever or rotating body can be controlled to move circumferentially around the valve stem as the central axis. The control lever drives the valve stem to rotate, thereby controlling the rise and fall of the valve disc and realizing the opening or closing of the valve. When it is necessary to keep the valve in an open or closed state, the flipping mechanism flips the control lever to a longitudinal state, disengaging it from the first and second cuts. The lever descends through the longitudinal opening. Once fully lowered, it is locked within the opening by a locking mechanism. Due to the clearance hole, even if the rotating body is rotated, the valve stem cannot be rotated. Without professional instruction, others may not be able to identify the valve opening control method. Integrating the lever and rotating body eliminates the traditional combination of lock cylinder and key. The lever itself serves as both an unlocking tool and an operating handle. Managers do not need to carry a unique key, thus preventing valve malfunction due to lost keys and reducing losses. For subsequent operations, simply align the first and second cuts by controlling the rotating body, and repeat the control method.

[0025] Further benefits: The physical position and angle of the control lever directly indicate the locking / unlocking status of the valve: the vertically lowered state indicates locking (idling), and the horizontally raised state indicates unlocking (linkage). Operators do not need to use tools or instruments; they can determine whether the valve is currently operable simply by observing the posture of the control lever with their naked eyes. This intuitive mechanical indicator effectively avoids misoperation caused by unclear status. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front sectional view of the present invention;

[0028] Figure 2 It corresponds Figure 1 Another state diagram of the joystick;

[0029] Figure 3 This is a three-dimensional sectional view of the rotating body, the clearance hole, the second cut, and the limiting block in this invention;

[0030] Figure 4 This is a front sectional view of the rotating body, valve stem, protective sleeve, mounting opening, and connecting bearing in this invention.

[0031] Figure 5 It corresponds Figure 4 Another state diagram of the protective sleeve;

[0032] Figure 6 It corresponds Figure 5 Enlarged view of part A;

[0033] Figure 7 This is a perspective view of the rotating body in this invention;

[0034] Figure 8 This is a schematic diagram of the bottom of the protective sleeve in this invention;

[0035] Figure 9 This is a schematic diagram of the control lever in this invention;

[0036] Figure 10 This is a schematic diagram of the structure of the limiting block in this invention.

[0037] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Valve disc; 5. Rotating body; 6. Clearance hole; 7. First cut; 8. Longitudinal opening; 9. Second cut; 10. Control lever; 11. Fixed rod; 12. Sliding waist hole; 13. Side opening; 14. Corresponding opening; 15. Limiting block; 151. Sliding block; 152. Limiting circle block; 153. Chamfered surface; 154. Pushing block; 155. Groove; 16. Protective sleeve; 17. Clearance through hole; 18. Inclined driving surface; 19. Mounting opening; 20. Connecting bearing. Detailed Implementation

[0038] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0039] See Figures 1 to 10 As shown, the technical solution adopted in this specific embodiment is: a mechanical encryption valve, including a valve body 1, a valve cover 2 disposed on the valve body 1, a valve stem 3 rotatably disposed on the valve cover 2 and with its lower end located inside the valve body 1, a valve disc 4 disposed on the valve body 1 and threadedly connected to the lower end of the valve stem 3 for moving up and down in the valve body 1 when the valve stem 3 rotates, the upper end of the valve stem 3 protruding from the valve cover 2, and also including a rotating body 5, a clearance hole 6, a first cut 7, a longitudinal opening 8, a second cut 9, a control lever, a flipping mechanism, and a locking mechanism;

[0040] The rotating body 5 is rotatably mounted on the upper end of the valve cover 2, and the clearance hole 6 is longitudinally opened through the rotating body 5, with the clearance hole 6 and the valve stem 3 in clearance fit.

[0041] The first cut 7 is opened laterally on the upper end face of the valve stem 3, and the second cut 9 is opened on the upper end of the rotating body 5 and is connected to the clearance hole 6 and the longitudinal opening 8. The longitudinal opening 8 is opened longitudinally on the rotating body 5.

[0042] The control lever is raised and lowered within the longitudinal opening 8, and is used to rise or fall within the longitudinal opening 8 when the control lever is in the longitudinal state and is pulled by an external force. The control lever is in clearance fit with the first cut 7 and the second cut 9.

[0043] The flipping mechanism is located between the rotating body 5 and the control lever, and is located in the longitudinal opening 8. The flipping mechanism is used to allow the control lever to be flipped to the horizontal state and inserted into the first cut 7 and the second cut 9 when the first cut 7 and the second cut 9 are in the rising state, or to allow the control lever to be flipped to the longitudinal state and descend from the longitudinal opening 8 when the control lever is in the rising state.

[0044] A locking mechanism is provided between the rotating body 5 and the control lever. The locking mechanism is used to lock or unlock the control lever in the longitudinal opening 8 after the control lever is flipped to the longitudinal state and descends from the longitudinal opening 8.

[0045] The rotating body 5 is a square block, and the clearance hole 6 is a square hole with a side length greater than the diameter of the upper end of the valve stem 3. A first slit 7 is horizontally through the valve stem 3, forming a straight cut. A second slit 9 is horizontally through the upper surface of the rotating body 5. The first slit 7 and the second slit 9 have the same depth and width. To further enhance the sealing effect, the height of the valve stem 3 is set lower than the height of the rotating body 5, so that control can only be achieved through a lever. In this case, the depth of the second slit 9 is greater than the depth of the first slit 7. A longitudinal opening 8 is perpendicular to the first slit 7 and the second slit 9.

[0046] The flipping mechanism includes a fixed rod 11 disposed on the rotating body 5 and located in the longitudinal opening 8, and a sliding waist hole 12 opened on the control lever and clearance-fitted with the fixed rod 11. The sliding waist hole 12 is opened along the length direction of the control lever.

[0047] like Figure 9 As shown, the sliding waist hole 12 is located in the lower half of the control lever, and the fixed rod 11 is located on the rotating body 5 at the middle of the control lever. After the control lever is fully pulled up, the tail of the sliding waist hole 12 abuts against the fixed rod 11, which restricts the control lever from rising further. The clearance fit between the control lever and the second cut 9, as well as the distance between the tail of the control lever and the longitudinal opening 8, are sufficient to allow the control lever to flip to the right in a horizontal state, so that it can be inserted into the first cut 7 and the second cut 9. In this application, the rotating body 5 is processed by a split mold with the structure in half during production. After demolding, it is precision machined and then assembled and welded together. The fixed rod 11 and the rotating body 5 are produced by integral molding. The sliding waist hole 12 and the control lever can also be processed by integral molding, or the sliding waist hole 12 can be milled separately after the control lever is processed.

[0048] In another embodiment, for the flipping mechanism, the fixed rod 11 can be set on the front and rear sides of the control rod 10, and the sliding waist hole 12 can be opened on the rotating body 5 and communicate with the longitudinal opening 8. In this case, the sliding waist hole 12 is located on the front and rear sides of the control rod 10 and is in clearance fit with the fixed rod 11.

[0049] The locking mechanism includes a side opening 13 on the side end face of the rotating body 5 and connected to the longitudinal opening 8; a corresponding opening 14 on the side end face of the control lever, which corresponds to the position of the side opening 13 after the control lever is flipped to the longitudinal state and descends from the longitudinal opening 8; and a limiting block 15 slidably disposed on the rotating body 5 and located in the side opening 13, which engages with the corresponding opening 14 to limit the rise of the control lever when the corresponding opening 14 corresponds to the position of the side opening 13.

[0050] The corresponding opening 14 is an arc-shaped hole. The limiting block 15 includes a sliding block 151 slidably disposed on the rotating body 5 and located in the side opening 13, a limiting round block 152 disposed on the right end face of the sliding block 151 for engaging and fixing with the corresponding opening 14, a chamfered surface 153 disposed on the control lever and connected to the corresponding opening 14 for facilitating the locking of the limiting round block 152 into the corresponding opening 14, a pushing block 154 disposed on the left end face of the sliding block 151, and a groove 155 disposed on the pushing block 154.

[0051] Without the sliding block 151, limiting block 152, pushing block 154, chamfered surface 153, and groove 155, the shape of the corresponding opening 14 can be the same as the shape of the side opening 13. The fixing effect can be achieved simply by having the limiting block 15, which slides within the side opening 13, engage with the corresponding opening 14. The side opening 13 is located in the upper half of the control lever.

[0052] The upper end of the rotating body 5 is fitted with a protective sleeve 16. The protective sleeve 16 is fitted with the rotating body 5 through an inner cavity. The protective sleeve 16 has a clearance hole 17 for the control lever to pass through the protective sleeve 16 when the protective sleeve 16 is installed on the rotating body 5.

[0053] The inner cavity of the protective sleeve 16 has the same shape as the rotating body 5, and the gap between the two is between 0.2-2mm. The smaller the gap between the two, the greater the sliding resistance of the protective sleeve 16 on the rotating body 5, thereby reducing the difficulty for external personnel to easily lift the protective sleeve 16 off the rotating body 5.

[0054] The left end face of the push block 154 is provided with an inclined driving surface 18, which is used to contact the protective sleeve 16 when the protective sleeve 16 is installed on the rotating body 5, thereby driving the push block 154 to drive the limiting circle block 152 to be inserted into the corresponding opening 14.

[0055] like Figure 6 , Figure 10 As shown, the tilting drive surface 18 is located on the upper left end face of the push block 154. When installing the protective sleeve 16, the position of the avoidance hole 17 should be aligned with the control lever before installation.

[0056] The lower end of the rotating body 5 is provided with a mounting hole 19, and a connecting bearing is provided between the lower end of the rotating body 5 and the upper end of the valve cover 2. The connecting bearing is located in the mounting hole 19. The upper end of the valve cover 2 is provided with a boss, which is located in the mounting hole 19, and a space for the connecting bearing is formed between the mounting hole 19 and the boss. The rotation of the rotating body 5 on the valve cover 2 is realized by the setting of the connecting bearing, and the connecting bearing is fixed to the rotating body 5 and the valve cover 2 by fitting.

[0057] The working principle of this invention: In this application, the valve is encrypted through the mechanical control of multiple components. When it is necessary to control the opening and closing of the valve, if the protective sleeve 16 has been installed, the protective sleeve 16 must be removed first to expose the side opening 13. The push block 154 is pulled to the left by hooking the groove 155 with a tool, so that the limiting block 152 is dislodged from the corresponding opening 14, thereby releasing the control lever from locking in the longitudinal opening 8. Then, the control lever is pulled upward to make it in the rising state. Through the hinge and sliding cooperation of the sliding waist hole 12 and the fixed rod 11, the control lever is flipped to the horizontal state and inserted into the first cut 7 and the second cut 9. At this time, the control lever or the rotating body 5 can be controlled to move circumferentially around the valve stem 3 as the central axis. The control lever drives the valve stem 3 to rotate, so as to control the rise and fall of the valve disc 4 and realize the opening or closing of the valve.

[0058] When the valve needs to be kept open or closed, the control lever is flipped to the longitudinal position through the hinge of the sliding waist hole 12 and the fixed rod 11, so that it disengages from the first cut 7 and the second cut 9 and descends from the longitudinal opening 8. After the control lever is fully descended, the sliding block 151 is pushed in from the side opening 13 until the limiting block 152 abuts against the control lever at the chamfered surface 153. At this time, the protective sleeve 16 is inserted downward from the rotating body 5. During the downward insertion of the protective sleeve 16, the inclined driving surface 18 presses against the protective sleeve 16, so that the pushing block 154 gradually drives the sliding block 151 to move closer to the control lever in the side opening 13 as the protective sleeve 16 is inserted downward, until the limiting block 152 on the right is engaged. In the corresponding opening 14, the arc shape of the corresponding opening 14 and the circular shape of the limiting block 152 form a locking state, so that the limiting block 152 can be locked into the corresponding opening 14 without external force to squeeze the pushing block 154. This reduces the cumbersomeness of the locking process and avoids the situation where the valve is not truly locked due to forgetting to manually push the limiting block 15. At the same time, removing the protective cover 16 requires a special tool to hook the groove 155, which further increases the difficulty of unauthorized opening. This achieves the effect of automatically locking the control lever after the protective cover 16 is installed. At this time, due to the setting of the avoidance hole 6, even if the rotating body 5 is rotated, it cannot drive the valve stem 3 to rotate. If others have not received professional user training, it is difficult for them to discover the control method for opening the valve.

[0059] This invention integrates the control lever with the rotating body 5, eliminating the traditional combination of lock cylinder and key. The control lever itself is both an unlocking tool and an operating handle. Managers do not need to carry a unique key, thus preventing the valve from becoming inoperable due to a lost key, thereby reducing losses. When it is necessary to operate the valve again in the future, simply control the rotating body 5 to align the positions of the first cut 7 and the second cut 9, and repeat the above control method.

[0060] This invention protects the product's structure; the model numbers of the components are not protected by this invention, as they are common technology. Any component on the market that can achieve the functions described above can be used as a mechanical encryption valve. Therefore, the model numbers and other parameters of the components are not described in detail in this invention. The contribution of this invention lies in the scientific combination of the various components.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents. Any aspects not detailed in the present invention are well-known to those skilled in the art.

Claims

1. A mechanical encryption valve, comprising a valve body, a valve cover disposed on the valve body, a valve stem rotatably disposed on the valve cover with its lower end located within the valve body, and a valve disc disposed on the valve body and threadedly connected to the lower end of the valve stem for moving up and down within the valve body when the valve stem rotates, wherein the upper end of the valve stem protrudes from the valve cover, characterized in that: It also includes a rotating body, a clearance hole, a first cut, a longitudinal opening, a second cut, a control lever, a flipping mechanism, and a locking mechanism; The rotating body is rotatably mounted on the upper end of the valve cover, and the clearance hole is longitudinally opened through the rotating body, with the clearance hole and valve stem having a clearance fit. The first slit is opened laterally on the upper end face of the valve stem, the second slit is opened at the upper end of the rotating body and is connected to the clearance hole and the longitudinal opening, and the longitudinal opening is opened longitudinally on the rotating body; The control lever is raised and lowered within the longitudinal opening, and is used to rise or fall within the longitudinal opening when the control lever is in the longitudinal state and is pulled by an external force. The control lever is in clearance fit with the first cut and the second cut. The flipping mechanism is located between the rotating body and the control lever and is located in the longitudinal opening. The flipping mechanism is used to allow the control lever to flip to the lateral state and lock into the first and second cuts after the first cut and the second cut are in the rising state, or to allow the control lever to flip to the longitudinal state and descend from the longitudinal opening when the control lever is in the rising state. The locking mechanism is located between the rotating body and the control lever. The locking mechanism is used to lock or unlock the control lever in the longitudinal opening after the control lever is flipped to the longitudinal position and descends from the longitudinal opening. The locking mechanism includes a side opening on the side end face of the rotating body and connected to the longitudinal opening, a corresponding opening on the side end face of the control lever for the control lever to descend from the longitudinal opening after being flipped to the longitudinal state, and a limiting block slidably disposed on the rotating body and located in the side opening for locking into the corresponding opening to limit the rise of the control lever when the corresponding opening and the side opening are in the corresponding position. The corresponding opening is an arc-shaped hole. The limiting block includes a sliding block slidably disposed on the rotating body and located in the side opening, a limiting round block disposed on the right end face of the sliding block for engaging and fixing with the corresponding opening, a chamfered surface disposed on the control rod and connected to the corresponding opening for facilitating the limiting round block to engage in the corresponding opening, a pushing block disposed on the left end face of the sliding block, and a groove disposed on the pushing block. The upper end of the rotating body is fitted with a protective sleeve, which is fitted with the rotating body through an inner cavity. The protective sleeve has a clearance hole for the control lever to pass through when the protective sleeve is installed on the rotating body.

2. The mechanical encryption valve according to claim 1, characterized in that: The flipping mechanism includes a fixed rod disposed on the rotating body within a longitudinal opening, and a sliding waist hole disposed on the control rod and in clearance fit with the fixed rod, the sliding waist hole being disposed along the length direction of the control rod.

3. The mechanical encryption valve according to claim 1, characterized in that: The left end face of the push block is provided with an inclined driving surface, which is used to contact the protective sleeve when the protective sleeve is put into the rotating body, thereby driving the push block to drive the limiting circle block into the corresponding opening.

4. A mechanical encryption valve according to claim 1, characterized in that: The lower end of the rotating body is provided with a mounting opening, and a connecting bearing is provided between the lower end of the rotating body and the upper end of the valve cover. The connecting bearing is located in the mounting opening.

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