Mechanical coded locking valve

Abstract

The utility model provides a mechanical coded locking valve, and belongs to the technical field of valves. The problem that assembling is inconvenient is solved. The upper end of the valve rod extends out of the valve body, the upper end of the valve rod is fixedly connected with an operating part, the roller coded lock cylinder is arranged in the operating part, a lock head capable of sliding up and down and a reset spring with upward elastic force are arranged in the operating part, and a through hole is formed in the bottom of the operating part. The lock head can stretch out of the through hole after compressing the reset spring, the roller coded lock cylinder can lock the lock head in the state of stretching out of the through hole, a locking groove is formed in the upper end of the valve body, and when the valve rod is located at the position where the mechanical coded locking valve is closed, the operation piece is located at the position, over the locking groove, of the through hole. The device has the advantages of convenience in assembly and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a mechanical password locking valve. Background Art

[0002] With the increasing demand for water and gas resources, managers have begun to replace traditional valves with valves with locking functions. When users have not paid their water or gas bills, the locking function will lock the valves in the closed state so that they cannot be opened at will.

[0003] For example, a password locking valve with patent application number 201320430411.5 includes a valve body and a lock core that can be sleeved on the valve stem extension at the upper end of the valve body. The bottom of the lock core has a concave cavity that matches the valve stem extension at the upper end of the valve body. The lock core is outer-connected with a lock body. The upper end of the lock core is provided with a number of password dials. The side of the upper end of the valve body is provided with an annular embedding groove. The side of the lower end of the lock core is circumferentially provided with a number of penetrating positioning holes. A ball is provided in the positioning hole. Under the action of the inner side wall of the lock body, the ball part extends out of the positioning hole at one end of the inner side wall of the lock core and is embedded in the embedding groove of the valve body. The inner side wall of the lower end of the lock body is provided with grooves with the same number of positioning holes. When the password dial is rotated to the set value, the lock core can rotate relative to the lock body and make the positioning hole face the groove. When the valve is open, the combination dial is rotated to the set value to put the lock core in the unlocked state, the positioning hole on the inner wall of the lock core is opposite to the groove on the inner wall of the lock shell, and the ball arranged in the positioning hole is located in the groove; when the lock core is rotated, the positions of the positioning hole and the groove are staggered with each other, and the inner wall of the lock body causes the ball part to extend out of the positioning hole and embed into the annular groove on the upper end of the valve body, so that the lock core locks the valve body and the two are locked with each other, and then the combination dial can be messed up, so that the valve is closed and cannot be used.

[0004] However, the password locking valve mentioned above also has its shortcomings: the valve is locked by a ball, and in order to ensure that the ball does not fall out when it is unlocked, a lock body needs to be provided on the outside. Therefore, during assembly, it is necessary not only to connect the lock body but also to ensure that the ball does not fall out during the assembly process, which leads to inconvenience in assembly. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems existing in the prior art and propose a mechanical password locking valve to solve the problem of inconvenient assembly.

[0006] The purpose of this utility model can be achieved through the following technical solutions:

[0007] A mechanical password locking valve comprises a valve body, a roller password lock core and a valve stem extending out of the valve body at the upper end, an operating member being fixedly connected to the upper end of the valve stem, and is characterized in that the roller password lock core is arranged in the operating member, a lock head which can slide up and down and a return spring whose elastic force acts upward on the lock head are provided in the operating member, a through hole is provided at the bottom of the operating member, the lock head can extend out of the through hole after compressing the return spring and the roller password lock core can lock the lock head in a state of extending out of the through hole, a locking groove is provided at the upper end of the valve body, and when the valve stem is in the position to close the mechanical password locking valve, the operating member is in a position where the through hole is directly above the locking groove.

[0008] Under normal conditions, the roller combination lock cylinder is in the unlocked state, at which point the lock head is lifted by the return spring. To lock the valve, the administrator first pulls the operating member to rotate the valve stem until the valve is closed. When the valve stem is in the valve-closing position, the operating member is positioned so that the through-hole at its bottom is directly above the locking slot on the outer side of the valve body's upper end. The administrator then presses the lock head, which overcomes the return spring and moves downward, causing the lower end of the lock head to extend out of the through-hole and into the locking slot. The combination of the roller combination lock cylinder is then scrambled, locking it in the locked state and locking the locking plate out of the through-hole. This secures the operating member to the valve body and prevents further operation.

[0009] This mechanical password locking valve achieves locking of the operating part and the valve body by arranging a roller password lock core in the operating part and arranging a locking head in the operating part, and the locking head is inserted into the locking groove. The entire locking structure except the locking groove is integrated on the operating part. The operating part is connected to the upper end of the valve stem and no longer has a direct connection with the valve body itself. It is only necessary to provide a locking groove on the outer side of the upper end of the valve body for the locking head to be inserted into after extending out of the operating part. That is to say, during assembly, it is only necessary to fix the operating part and the valve stem together, and there is no need to connect other transition components to the valve body. This greatly reduces the difficulty of assembling the mechanical password locking valve.

[0010] In the above-mentioned mechanical password locking valve, the side of the lock head has a slot, and the roller password lock core includes a locking piece and an action spring arranged along the length direction of the operating part. When the lock head extends out of the through hole, the position of the slot is opposite to the locking piece and the locking piece is inserted into the slot under the elastic force of the action spring. When the roller password lock core is in the locked state, the locking piece is limited in the direction of escaping from the slot.

[0011] When the roller combination lock cylinder is in the unlocked state, press the lock head to insert its lower end into the locking slot. The slot is positioned opposite the locking piece, and the locking piece is inserted into the slot under the action of the spring, thus positioning the lock head. Then, the combination of the roller combination lock cylinder is scrambled to put it in the locked state, and the locking piece is restricted in the direction of being out of the slot, thereby locking the lock head.

[0012] In the above-mentioned mechanical password locking valve, the side of the operating member has a strip-shaped clearance groove arranged along its length direction, and the side of the locking piece is integrally connected with a dial head, which extends out of the clearance groove.

[0013] By setting the dial head, the manager can easily operate the locking piece when the roller password lock cylinder is in the unlocked state.

[0014] In the above-mentioned mechanical password locking valve, the operating part has an assembly hole, which passes through the top of the operating part. The lock head is located in the assembly hole. The side of the lock head also has a limiting groove, which is located below the slot. The upper side wall of the limiting groove is tilted upward.

[0015] In the unlocked / locked state, the lock head is held up by the return spring. In this state, the position of the retaining slot is opposite the locking plate, and the locking plate is inserted into the retaining slot under the elastic force of the action spring. This design ensures that the lock head cannot be completely removed from the assembly hole. In addition, the upper side wall of the retaining slot is tilted upward. This means that when the administrator presses the lock head downward, the upper side wall of the retaining slot moves relative to the locking plate and automatically pushes the locking plate out of the retaining slot, allowing the lock head to smoothly move down to the position where the slot is aligned with the locking plate.

[0016] In the above-mentioned mechanical password locking valve, the upper end of the valve body has a cylindrical neck, the outer side of the neck is protruding with a protrusion, and a locking groove is provided at the top of the protrusion. The lock head includes a main body and an insertion rod slidably arranged in the main body along the vertical direction. The main body is also provided with a support spring that acts downward on the insertion rod with elastic force. The lower end of the insertion rod extends out of the main body, and the return spring rests on the lower end of the main body. The insertion rod is a flat sheet, and one side of the lower end of the insertion rod has an inclined guide surface. When the lock head is in a state of compressing the return spring and rotating the operating part to the valve stem to close the mechanical password locking valve, the lower end of the insertion rod can contact the outer wall of the protrusion and cause the guide surface to move along it.

[0017] This mechanical password locking valve has two locking methods, one of which is: when the roller password lock cylinder is unlocked (the lock head is lifted by the return spring at this time) and the valve is open, the administrator pulls the operating part to drive the valve stem to rotate to close the valve, and then the administrator directly presses the lock head to make the lower end of the insertion rod pass through the through hole and insert into the locking groove. Finally, the administrator locks the roller password lock cylinder to lock the position of the lock head to fix the operating part and the valve body. This is a conventional locking method.

[0018] Another method is: when the roller combination lock cylinder is unlocked (the lock head is retracted by the return spring) and the valve is open, the administrator directly presses the lock head to make the lower end of the plug rod pass through the through hole, and then locks the roller combination lock cylinder to lock the position of the lock head. At this time, the lower end of the plug rod is not inserted into the locking groove, that is, the operating member is not fixed to the valve body, and the operating member is still in a movable state. Once the user pulls the operating member to drive the valve stem to close the valve, the plug rod moves with the operating member. When the lower end of the plug rod comes into contact with the outer wall of the protrusion, the outer wall of the protrusion moves along the guide surface of the lower end of the plug rod, overcoming the action of the support spring and pushing the plug rod upward until the lower end of the plug rod is located above the locking groove. The plug rod is automatically inserted into the locking groove under the elastic force of the support spring, and the operating member is fixed to the valve body. The second locking method is mainly set to enable users to only close the valve in emergency situations. For example, when this mechanical password valve is used on a gas pipeline, if a gas leak occurs, the user can close the valve in an emergency to prevent further gas leakage. After the valve is closed in an emergency, the operating part cannot be moved again to ensure that the valve is reopened only when the gas leak has been resolved, avoiding users from opening the valve on their own when they are not sure whether the gas leak has been resolved.

[0019] In the above-mentioned mechanical password locking valve, the outer side wall of the protrusion has an inclined matching surface, and the matching surface can be in contact with the guide surface.

[0020] When the mechanical password locking valve is in the second locking mode, the lower end of the insertion rod can be pushed upward more smoothly when it contacts the side wall of the protrusion due to the setting of the matching surface.

[0021] In the above-mentioned mechanical password locking valve, the side of the main body has a strip-shaped anti-rotation groove arranged along the vertical direction, and the side of the insertion rod is fixedly connected with an anti-rotation pin, which is located in the anti-rotation groove.

[0022] The anti-rotation pin and anti-rotation groove ensure that the rod can move up and down without rotating relative to the main body, thus ensuring that the angle of the guide surface does not deviate. This structure also prevents the rod from falling out of the operating member.

[0023] In the above-mentioned mechanical password locking valve, a matching groove in the shape of a strip in the vertical direction is provided on the inner wall of the assembly hole, and the side of the main body has a matching portion in the shape of a strip arranged vertically, and the matching portion is located in the matching groove.

[0024] By setting the matching groove and the matching part, the main body can move up and down without rotating relative to the operating part, and the insertion rod and the main body are circumferentially fixed by the matching of the anti-rotation pin and the anti-rotation groove, so that the insertion rod will not rotate relative to the operating part, thereby ensuring that the angle of the guide surface will not deviate.

[0025] In the above-mentioned mechanical password locking valve, the operating member is in the shape of a handle, one end of the operating member is connected to the valve stem, the cross-section of the upper end of the valve stem is non-circular, the bottom of the end of the operating member connected to the valve stem has a connecting hole and the end of the operating member has a cavity, the cavity passes through the upper surface of the operating member and the connecting hole is connected to the cavity, the shape of the connecting hole matches the upper end of the valve stem, the upper end of the valve stem passes through the connecting hole into the cavity and the upper end of the valve stem is threadedly connected to a locking nut, the locking nut rests on the bottom wall of the cavity, and the operating member is also connected to a protective cover at the cavity.

[0026] Compared with the existing technology, this mechanical password locking valve sets the roller password lock core in the operating part and sets a lock head in the operating part, and the lock head is inserted into the locking groove to fix the operating part and the valve body. Except for the locking groove, the rest of the entire locking structure is integrated on the operating part. The operating part is connected to the upper end of the valve stem and no longer has a direct connection with the valve body itself. It is only necessary to set a locking groove on the outer side of the upper end of the valve body. That is to say, during assembly, it is only necessary to fix the operating part and the valve stem together, thereby greatly reducing the assembly difficulty of the mechanical password locking valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a cross-sectional view of the mechanical password locking valve when the operating member and the valve body are locked.

[0028] Figure 2 It is a three-dimensional schematic diagram of the mechanical password locking valve in a state where the operating member and the valve body are locked.

[0029] Figure 3 This is a three-dimensional schematic diagram from another angle of the mechanical password locking valve when the operating member and the valve body are locked.

[0030] Figure 4 It is a three-dimensional schematic diagram when the locking piece locks the lock head in position.

[0031] Figure 5 The mechanical password locking valve is in a state where the lock head is locked but the operating part can still be operated.

[0032] Figure 6 It is an exploded diagram between the operating part and the valve body.

[0033] In the figure, 1, valve body; 1a, locking groove; 1b, neck; 1c, protrusion; 1c1, mating surface; 1d, stop block; 2, valve stem; 3, ball core; 4, operating part; 4a, through hole; 4b, limit block; 4c, give way groove; 4d, assembly hole; 4e, connecting hole; 4f, cavity; 4g, lower half shell; 4h, upper half shell; 5, roller combination lock cylinder; 6, lock head; 6a, main body; 6a1, slot; 6a2, limit groove; 6a3, anti-rotation groove; 6b, insert rod; 6b1, guide surface; 7, return spring; 8, locking plate; 8a, dial head; 8b, locking part; 9, action spring; 10, wheel axle; 10a, shoulder; 11, code change wheel; 12, number wheel; 13, support spring; 14, anti-rotation pin; 15, lock nut; 16, protective cover. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] like Figure 1 and, Figure 2 and Figure 3 As shown, the mechanical password locking valve comprises a valve body 1 and a valve stem 2, the upper end of which extends out of the valve body 1. A ball core 3 is also located within the valve body 1, and the lower end of the valve stem 2 is connected to the ball core 3. An operating member 4 is fixedly connected to the upper end of the valve stem 2, and a roller password lock cylinder 5 is located within the operating member 4. The operating member 4 is handle-shaped, with one end connected to the valve stem 2. It houses a lock head 6 that can slide up and down, and a return spring 7 that acts upward on the lock head 6. The bottom of the operating member 4 has a through hole 4a. After the return spring 7 is compressed, the lock head 6 can extend out of the through hole 4a, and the roller password lock cylinder 5 can lock the lock head 6 in a state where it extends out of the through hole 4a. A locking groove 1a is located at the upper end of the valve body 1. When the valve stem 2 is in the valve-closing position, the operating member 4 is positioned directly above the through hole 4a and the locking groove 1a. Among them, the upper end of the valve body 1 has a cylindrical neck 1b, the outer side of the neck 1b is protruding with a protrusion 1c, and the locking groove 1a is provided at the top of the protrusion 1c; the outer side of the neck 1b is also protruding with two stops 1d, and the angle between the two stops 1d is 90°. The bottom of one end of the operating member 4 connected to the valve stem 2 has a limit block 4b located between the two stops 1d. When the valve stem 2 is in the valve closing position, the limit block 4b abuts against one of the stops 1d.

[0036] Specifically, if Figure 1 and Figure 4As shown, the side of the lock cylinder 6 has a slot 6a. The roller combination lock cylinder 5 includes a locking plate 8 and an action spring 9 arranged along the length of the operating member 4. When the lock cylinder 6 extends out of the through hole 4a, the slot 6a is positioned opposite the locking plate 8, and the locking plate 8 is inserted into the slot 6a under the elastic force of the action spring 9. When the roller combination lock cylinder 5 is locked, the locking plate 8 is restrained from exiting the slot 6a. The side of the operating member 4 has a strip-shaped clearance groove 4c arranged along its length. The side of the locking plate 8 is integrally connected to a dial head 8a, which extends out of the clearance groove 4c. The operating member 4 has an assembly hole 4d extending through the top of the operating member 4. The lock cylinder 6 is located within the assembly hole 4d. The lock cylinder 6 also has a limiting groove 6a2 on its side. The limiting groove 6a2 is located below the slot 6a, and the upper side wall of the limiting groove 6a2 is tilted upward. In this embodiment, the locking piece 8 has a locking portion 8 b , and the locking portion 8 b of the locking piece 8 is inserted into the slot 6 a or the limiting groove 6 a 2 of the lock head 6 .

[0037] In practice, if Figure 1 As shown, the roller combination lock cylinder 5 also includes a wheel axle 10 arranged along the length direction of the operating member 4, code-changing wheels 11 sequentially sleeved on the wheel axle 10, and number wheels 12 sleeved outside each code-changing wheel 11, each number wheel 12 is partially exposed outside the upper surface of the operating member 4, and the end of the wheel axle 10 close to the lock head 6 has a shoulder 10a and a reset spring 7 sleeved on this end of the wheel axle 10. The wheel axle 10 is blocked in the direction close to the lock head 6, and the two ends of the reset spring 7 respectively abut against the shoulder 10a and the code-changing wheel 11 closest to the shoulder 10a, and a plug-in structure with a concave-convex fit is provided between each number wheel 12 and the code-changing wheel 11 sleeved thereon. Each code change wheel 11 has an unlocking notch on its edge closest to the shoulder 10a. Each number wheel 12 passes through a locking plate 8. The locking plate 8 has a pointed portion corresponding to each unlocking notch along the axial direction of the wheel shaft 10. One end of the wheel shaft 10 with the shoulder 10a abuts against the locking plate 8 toward the lock head 6. The roller combination lock cylinder 5 is prior art, as detailed in previously published patent application number 202422151676.2.

[0038] Further, if Figure 1 and Figure 5As shown, the lock 6 includes a main body 6a and a rod 6b that slides vertically within the main body 6a. A support spring 13 is also provided within the main body 6a, exerting a downward force on the rod 6b. The lower end of the rod 6b extends outside the main body 6a, and a return spring 7 abuts the lower end of the main body 6a. The main body 6a has a mating hole extending through its lower end surface, the upper end of the rod 6b is positioned within the mating hole, and the support spring 13 is positioned within the mating hole. The side of the main body 6a has a vertically extending strip-shaped anti-rotation groove 6a3. An anti-rotation pin 14 is fixedly connected to the upper side of the rod 6b and positioned within the anti-rotation groove 6a3. The engagement of the anti-rotation pin 14 with the anti-rotation groove 6a3 prevents the rod 6b from rotating relative to the main body 6a and also prevents the rod 6b from falling out of the operating member 4. The inner wall of the assembly hole 4d is provided with a vertically extending, strip-shaped mating groove. The side of the main body 6a has a vertically extending, strip-shaped mating portion located within the mating groove. The insert rod 6b is flat, with an inclined guide surface 6b1 on one side of its lower end. When the lock 6 is in the state of compressing the return spring 7 and rotating the operating member 4 to close the valve stem 2, the lower end of the insert rod 6b can contact the outer wall of the protrusion 1c, causing the guide surface 6b1 to move along it. The outer wall of the protrusion 1c has an inclined mating surface 1c1 that abuts against the guide surface 6b1.

[0039] This mechanical password locking valve actually has two locking methods. One of them is: when the roller password lock cylinder 5 is unlocked (the lock head 6 is lifted by the return spring 7) and the valve is open, the administrator pulls the operating member 4 to drive the valve stem 2 to rotate to close the valve, and then the administrator directly presses the lock head 6, so that the lower end of the insertion rod 6b passes through the through hole 4a and inserts into the locking groove 1a. At the same time, the locking piece 8 is inserted into the slot 6a on the side of the lock head 6 under the action of the action spring 9. Finally, the administrator locks the roller password lock cylinder 5 to lock the position of the lock head 6 to achieve the fixation of the operating member 4 and the valve body 1. This is a conventional locking method, just like Figure 1 、 Figure 2 and Figure 3 Same as shown.

[0040] Another method is: when the roller combination lock cylinder 5 is unlocked (the lock head 6 is bounced by the return spring 7) and the valve is open, the manager directly presses the lock head 6 to make the lower end of the insertion rod 6b pass through the through hole 4a, and then the manager locks the roller combination lock cylinder 5 to lock the position of the lock head 6. At this time, the lower end of the insertion rod 6b is not inserted into the locking groove 1a, that is, the operating member 4 has not yet been fixed to the valve body 1, and the operating member 4 is still in a movable state. This state is as shown in FIG. Figure 5As shown. Once the user activates the operating member 4 to rotate the valve stem 2 and close the valve, the plunger 6b moves with the operating member 4. When the lower end of the plunger 6b contacts the outer wall of the protrusion 1c, the outer wall of the protrusion 1c moves along the guide surface 6b1 at the lower end of the plunger 6b, pushing the plunger 6b upward, overcoming the force of the support spring 13 until the lower end of the plunger 6b is above the locking groove 1a. Under the elastic force of the support spring 13, the plunger 6b automatically inserts into the locking groove 1a, securing the operating member 4 to the valve body 1. The second locking method is designed to allow users to only use the valve for emergency closure in critical situations. For example, if this mechanical code valve is used on a gas pipeline, if a gas leak occurs, the user can close the valve to prevent further leakage. After the valve is closed, the operating member 4 cannot be activated again. This ensures that the valve is reopened only by a management personnel after the leak has been resolved, preventing users from reopening the valve without knowing whether the leak has been resolved.

[0041] This mechanical password locking valve is achieved by setting the roller password lock core 5 in the operating member 4 and setting a lock head 6 in the operating member 4. The lock head 6 is inserted into the locking groove 1a to fix the operating member 4 and the valve body 1. The entire locking structure is integrated on the operating member 4 except for the locking groove 1a. The operating member 4 is connected to the upper end of the valve stem 2 and has no direct connection with the valve body 1 itself. It is only necessary to set a locking groove 1a on the outer side of the upper end of the valve body 1. That is to say, during assembly, it is only necessary to fix the operating member 4 and the valve stem 2 together, thereby greatly reducing the assembly difficulty of the mechanical password locking valve.

[0042] like Figure 1 and Figure 6 As shown, the cross-section of the upper end of the valve stem 2 is non-circular. The bottom of the end of the operating member 4 connected to the valve stem 2 has a coupling hole 4e, and the operating member 4 has a cavity 4f within this end. Cavity 4f extends through the upper surface of the operating member 4, and the coupling hole 4e is connected to the cavity 4f. The shape of the coupling hole 4e matches the upper end of the valve stem 2. The upper end of the valve stem 2 passes through the coupling hole 4e into the cavity 4f. The upper end of the valve stem 2 is threadedly connected to a locking nut 15, which abuts the bottom wall of the cavity 4f. The operating member 4 is also connected to the cavity 4f with a protective cover 16. In practice, the operating member 4 is composed of a lower half shell 4g and an upper half shell 4h fixed by fasteners.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A mechanical password locking valve, comprising a valve body (1), a roller password lock core (5), and a valve stem (2) whose upper end extends out of the valve body (1), wherein an operating member (4) is fixedly connected to the upper end of the valve stem (2), and characterized in that: The roller password lock core (5) is arranged in the operating member (4), and a lock head (6) that can slide up and down and a return spring (7) with elastic force acting upward on the lock head (6) are provided in the operating member (4). The bottom of the operating member (4) has a through hole (4a), and the lock head (6) can extend out of the through hole (4a) after compressing the return spring (7), and the roller password lock core (5) can lock the lock head (6) in a state of extending out of the through hole (4a). The upper end of the valve body (1) has a locking groove (1a), and when the valve stem (2) is in a position to close the mechanical password locking valve, the operating member (4) is in a position where the through hole (4a) is located directly above the locking groove (1a).

2. The mechanical password locking valve according to claim 1, characterized in that: The lock head (6) has a slot (6a1) on its side, and the roller password lock core (5) includes a locking piece (8) and an action spring (9) arranged along the length direction of the operating member (4). When the lock head (6) extends out of the through hole (4a), the position of the slot (6a1) is opposite to the locking piece (8), and the locking piece (8) is inserted into the slot (6a1) under the elastic force of the action spring (9). When the roller password lock core (5) is in the locked state, the locking piece (8) is limited in the direction of being out of the slot (6a1).

3. The mechanical password locking valve according to claim 2, characterized in that: The side of the operating member (4) has a strip-shaped clearance groove (4c) arranged along its length direction, and the side of the locking piece (8) is integrally fixedly connected with a dial head (8a), and the dial head (8a) extends out of the clearance groove (4c).

4. The mechanical password locking valve according to claim 2, characterized in that: The operating member (4) has an assembly hole (4d) therein, the assembly hole (4d) passes through the top of the operating member (4), the lock head (6) is located in the assembly hole (4d), and the side of the lock head (6) also has a limiting groove (6a2), the limiting groove (6a2) is located below the slot (6a1), and the upper side groove wall of the limiting groove (6a2) is arranged to be inclined upward.

5. The mechanical password locking valve according to claim 4, characterized in that: The valve body (1) has a cylindrical neck (1b) at the upper end, a protrusion (1c) is provided on the outer side of the neck (1b), a locking groove (1a) is provided on the top of the protrusion (1c), and the lock head (6) includes a main body (6a) and an insert rod (6b) which is slidably provided in the main body (6a) in the vertical direction, and a supporting spring (13) which acts downward on the insert rod (6b) is provided in the main body (6a), and the lower end of the insert rod (6b) extends out of the main body (6a). The reset spring (7) abuts against the lower end of the main body (6a), the insert rod (6b) is in the shape of a flat sheet, and one side of the lower end of the insert rod (6b) has an inclined guide surface (6b1). When the lock head (6) is in the state of compressing the reset spring (7), the operating member (4) is rotated to the valve stem (2) to close the mechanical password locking valve. The lower end of the insert rod (6b) can contact the outer wall of the protrusion (1c) and make the guide surface (6b1) move along it.

6. The mechanical code locking valve according to claim 5, characterized in that: The outer side wall of the protrusion (1c) has an inclined mating surface (1c1), and the mating surface (1c1) can form abutment with the guide surface (6b1).

7. The mechanical password locking valve according to claim 5, characterized in that: The side of the main body (6a) has a strip-shaped anti-rotation groove (6a3) arranged in the vertical direction, and the side of the insertion rod (6b) is fixedly connected with an anti-rotation pin (14), which is located in the anti-rotation groove (6a3).

8. The mechanical code locking valve according to claim 7, characterized in that: The inner wall of the assembly hole (4d) is provided with a matching groove in the shape of a strip in the vertical direction, and the side of the main body (6a) has a matching portion in the shape of a strip arranged vertically, and the matching portion is located in the matching groove.

9. The mechanical password locking valve according to claim 1, characterized in that: The operating member (4) is in the shape of a handle, one end of the operating member (4) is connected to the valve stem (2), the cross section of the upper end of the valve stem (2) is non-circular, the bottom of the end of the operating member (4) connected to the valve stem (2) has a connecting hole (4e), and the end of the operating member (4) has a cavity (4f), the cavity (4f) passes through the upper surface of the operating member (4), and the connecting hole (4e) is connected to the cavity (4f), the shape of the connecting hole (4e) matches the upper end of the valve stem (2), the upper end of the valve stem (2) passes through the connecting hole (4e) into the cavity (4f), and the upper end of the valve stem (2) is threadedly connected to a locking nut (15), the locking nut (15) abuts against the bottom wall of the cavity (4f), and the operating member (4) is also connected to a protective cover (16) at the cavity (4f).

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