Valve opening mechanical limiting device, valve and limiting method

Abstract

The invention discloses a valve opening mechanical limiting device, a valve and a limiting method, and belongs to the technical field of valve opening limiting, the valve opening mechanical limiting device comprises a valve positioning support, the valve positioning support comprises a support positioning disc, and a plurality of positioning holes are evenly distributed in the support positioning disc in the circumferential direction; a limiting part is arranged in the limiting disc, and a plurality of limiting holes are evenly distributed in the limiting disc in the circumferential direction; the connecting shaft penetrates into the valve positioning bracket and the limiting disc and is rotationally connected with the valve positioning bracket; the limiting rod is fixedly connected with the connecting shaft, and after the opening degree of the valve is at the maximum preset opening degree, the limiting part prevents the limiting rod from rotating in the direction of increasing the opening degree of the valve; the ratio of the angle between every two adjacent positioning holes to the angle between every two adjacent limiting holes in the forward direction to the reverse direction has decimal. Through the valve positioning support, the limiting disc, the connecting shaft and the limiting rod, mechanical limiting of the opening degree of the valve is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of valve opening limit technology, and in particular relates to a valve opening mechanical limit device, a valve and a limit method. Background Art

[0002] A limit device is a device or mechanism used to limit the range of motion or position of an object. It is usually used in various machinery, equipment, automation systems and industrial production processes to ensure that the movement of an object is within a predetermined range and prevent it from exceeding safety or design limits, thereby protecting the safety of equipment and personnel and ensuring the normal operation of the system. With the development of industrial automation and precision manufacturing, the demand for limit devices continues to increase, especially in applications with high precision, high reliability and complex working conditions.

[0003] The existing conventional adjustable limit devices include electronic rotary limit devices and photoelectric rotary limit devices. The electronic rotary limit device uses a rotary encoder or potentiometer to detect the electrical signal and feed it back to the controller to achieve angle measurement and limit; the photoelectric rotary limit device uses a photoelectric sensor to emit a light beam and detect the light signal passing through the encoder disk, and converts the light signal into an electrical signal, and then the controller realizes angle measurement and limit according to the electrical signal feedback.

[0004] The valve opening limit device is a device used to limit the degree of opening and closing of the valve. For example, the Chinese patent with publication number CN110331703A discloses a ship lock valve opening control device, including a hoist frame, a brake motor, a reducer, a wire rope, a wire rope drum, a rotary encoder, a coupling, a sub-plate, a gear pair and a limit stroke switch. The brake motor, the reducer, the wire rope drum and the sub-plate are arranged on the hoist frame, the wire rope is wound on the wire rope drum, the brake motor output shaft is connected to the reducer, the reducer output shaft is connected to the wire rope drum, the rotary encoder and the limit stroke switch are arranged on the sub-plate, the rotary encoder and the limit stroke switch are both connected to the wire rope drum output shaft through the gear pair, the rotary encoder and the gear pair are connected through the coupling, and the rotary encoder is electrically connected to the limit stroke switch.

[0005] However, both electronic and photoelectric rotary limit devices have problems such as complex installation and reliance on power supply, limited anti-interference capabilities, and low reliability. Once an operating error occurs, it may even affect the safe operation of the equipment. As various types of valve limit devices, they are not suitable as the ultimate guarantee.

[0006] Therefore, it is urgent to develop a valve opening mechanical limit device, a valve and a limit method to solve the problems in the prior art. Summary of the invention

[0007] The purpose of the present invention is to provide a valve opening mechanical limit device, a valve and a limit method, which realizes the mechanical limit of the valve opening through a valve positioning bracket, a limit plate, a connecting shaft and a limit rod, so as to solve the problem that the rotating limit device proposed in the above background technology relies on power supply.

[0008] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0009] A valve opening mechanical limit device, comprising:

[0010] The valve positioning bracket comprises a bracket positioning plate, and the bracket positioning plate is provided with a plurality of positioning holes evenly distributed in the circumferential direction; the valve positioning bracket can be connected to the valve body;

[0011] A limiting plate, wherein a limiting portion is arranged inside the limiting plate, and a plurality of limiting holes are evenly distributed on the limiting plate in the circumferential direction, wherein the positioning holes and the limiting holes are used to realize a fixed connection between the bracket positioning plate and the limiting plate;

[0012] A connecting shaft, the connecting shaft penetrates into the valve positioning bracket and the limiting plate and is rotatably connected to the valve positioning bracket; the connecting shaft is used to connect to the transmission device of the valve;

[0013] A limit rod, the limit rod is fixedly connected to the connecting shaft, and when the valve opening is at a maximum preset opening, the limit part unidirectionally limits the rotation of the limit rod;

[0014] Wherein, the positive and negative ratios of the angle between two adjacent positioning holes and the angle between two adjacent limiting holes both have decimals; the arrangement of the limiting holes and the positioning holes satisfies:

[0015] αm=βn-γk;

[0016] Among them, α is the angle between two adjacent positioning holes, β is the angle between two adjacent limiting holes, γ is the limiting angle interval, and when k is an arbitrary integer, both m and n have integer solutions.

[0017] Furthermore, the limiting angle interval is less than or equal to 10°, and the number of the positioning holes and the limiting holes are both less than 20.

[0018] Furthermore, the bracket positioning plate has 18 positioning holes evenly distributed circumferentially, and the angle between two adjacent positioning holes is 20°; the limiting plate has 8 limiting holes evenly distributed circumferentially, and the angle between two adjacent limiting holes is 45°.

[0019] Furthermore, the valve positioning bracket further comprises:

[0020] A bracket connecting rod, one end of which is fixedly connected to the bracket positioning plate;

[0021] The support upper plate is fixedly connected to the other end of the support connecting rod.

[0022] Furthermore, a positioning scale line is provided on the side of the bracket positioning plate, and a scale structure is provided on the limiting plate.

[0023] Furthermore, a limiting cavity is formed in the limiting disk, and the limiting rod is arranged in the limiting cavity.

[0024] Furthermore, the limiting plate is formed by combining a first plate structure and a second plate structure, and the first plate structure and the second plate structure are connected in a detachable manner.

[0025] Furthermore, the limiting rod is provided with a thread, the connecting shaft is provided with a threaded hole matched with the limiting rod, and the limiting rod is fixedly connected to the connecting shaft through the threaded hole.

[0026] A valve comprises the valve opening mechanical limiting device.

[0027] A valve opening mechanical limiting method, applied to the valve opening mechanical limiting device or the valve;

[0028] There are 18 positioning holes evenly distributed on the bracket positioning plate in the circumferential direction, and the angle between two adjacent positioning holes is 20°. There are 8 limiting holes evenly distributed on the limiting plate in the circumferential direction, and the angle between two adjacent limiting holes is 45°. When the positioning plate and the limiting plate are aligned at 0°, at least two axially symmetrical positioning holes are coaxial with the limiting holes.

[0029] The valve opening mechanical limiting method comprises the following steps:

[0030] According to the required rotation limit angle, adjust the limit plate to the required limit angle;

[0031] Connect the limit plate and the bracket positioning plate through fasteners;

[0032] When the connecting shaft rotates to the limiting angle, the limiting plate contacts the limiting rod on the connecting shaft and prevents the limiting rod from further rotating.

[0033] The present invention has the following advantages:

[0034] (1) The present application only requires the installation of a valve positioning bracket, a limit plate, a connecting shaft and a limit rod to achieve mechanical limiting of the valve opening. The present application has low cost and is easy to install. It can significantly reduce manufacturing and operating costs, thus bringing higher economic benefits to users. The present invention is a purely mechanical limit device that does not require other auxiliary equipment. After installation, no other operations are required. The present invention can ensure the safe operation of the equipment. It has strong anti-interference capability and high reliability. It can avoid the problems of complex installation and reliance on power supply that exist in electronic rotary limit devices or photoelectric rotary limit devices. The present invention is suitable as the ultimate guarantee for valve limiting.

[0035] (2) The setting of the limit holes and the positioning holes of the present application satisfies: αm=βn-γk; and the positive and negative ratios of the angle between two adjacent positioning holes to the angle between two adjacent limit holes both have decimals, so as to reduce the setting of positioning holes and limit holes while ensuring that the limit angle interval is as small as possible, which is helpful for miniaturizing the mechanical limit device of the valve opening and enhancing the structural strength of the bracket positioning plate and the limit plate.

[0036] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural isometric diagram of the valve opening mechanical limit device of the present invention;

[0038] Figure 2 It is a structural cross-sectional view of the valve opening mechanical limit device of the present invention;

[0039] Figure 3 It is a structural side view of the valve opening mechanical limit device of the present invention;

[0040] Figure 4 It is a structural schematic diagram of the valve positioning bracket of the present invention.

[0041] Explanation of markings in the figure: 1. valve positioning bracket; 11. bracket positioning plate; 111. positioning hole; 12. bracket connecting rod; 13. bracket upper plate; 2. limit plate; 21. limit hole; 22. limit part; 3. connecting shaft; 4. limit rod. DETAILED DESCRIPTION

[0042] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] A valve opening mechanical limit device, such as Figures 1 to 3 As shown, including:

[0044] A valve positioning bracket 1, the valve positioning bracket 1 comprises a bracket positioning plate 11, the bracket positioning plate 11 has a plurality of positioning holes 111 evenly distributed in the circumferential direction, and the valve positioning bracket 1 can be fixedly connected to the valve body;

[0045] A limiting plate 2, wherein a limiting portion 22 is provided in the limiting plate 2 to form a limiting cavity, and a plurality of limiting holes 21 cooperating with the positioning holes 111 are evenly distributed on the limiting plate 2 in the circumferential direction, and the positioning holes 111 and the limiting holes 21 are used to realize a fixed connection between the bracket positioning plate 11 and the limiting plate 2;

[0046] A connecting shaft 3, the connecting shaft 3 penetrates into the valve positioning bracket 1 and the limiting plate 2 and is rotatably connected to the valve positioning bracket 1; the connecting shaft 3 is used to connect to the transmission device of the valve;

[0047] The limit rod 4 is arranged in the limit cavity, and the limit rod 4 is fixedly connected to the connecting shaft 3; when the valve opening is at the maximum preset opening, the end of the limit rod 4 contacts the limit part 22 to unidirectionally limit the rotation of the limit rod 4. In this embodiment, the valve opening mechanical limit device is used to limit the minimum opening of the valve, and the limit part 22 prevents the limit rod 4 from rotating in the direction of reducing the valve opening. If the valve opening mechanical limit device is used to limit the maximum opening of the valve, the limit part 22 is correspondingly configured to prevent the limit rod 4 from rotating in the direction of increasing the valve opening.

[0048] In this embodiment, the valve positioning bracket 1 is used to be fixedly connected to the valve body, the upper end of the connecting shaft 3 is provided with a square core for connecting to the transmission device, and the lower end of the connecting shaft 3 is provided with a square hole for connecting to the valve stem. At least two positioning holes 111 and two limiting holes 21 are at the same distance from the rotation axis of the limiting plate 2, so that when the positioning hole 111 and the limiting hole 21 are coaxial, the positioning hole 111 and the limiting hole 21 can be connected by a fastener to achieve a fixed connection between the valve positioning bracket 1 and the limiting plate 2.

[0049] In this embodiment, the connecting shaft 3 can rotate relative to the valve positioning bracket 1, and the connection shaft 3 and the valve positioning bracket 1 are rotatably connected in a contact manner or a non-contact manner.

[0050] When in use, the valve opening is set as required, and fasteners such as bolts or other existing fixing devices are inserted into the corresponding positioning holes 111 and the limiting holes 21 to fix the valve positioning bracket 1 and the limiting plate 2 through the positioning holes 111 and the limiting holes 21. When the valve opening is reduced, the transmission device rotates the connecting shaft 3, and the connecting shaft 3 drives the limiting rod 4 to rotate. When the valve opening is at the minimum valve opening, the connecting shaft 3 located in the limiting cavity abuts against the limiting portion 22 of the limiting plate 2 to limit the limiting rod 4 from continuing to rotate, thereby limiting the valve opening from continuing to decrease. In this embodiment, the limiting portions 22 are symmetrically arranged with two, and the length of the limiting rod 4 is greater than the distance between the limiting portion 22 and the axis of the limiting plate 2.

[0051] In this embodiment, the positive and negative ratios of the angle between two adjacent positioning holes 111 and the angle between two adjacent limiting holes 21 both have decimals; specifically, the axes of the limiting plate 2, the bracket positioning plate 11 and the valve positioning bracket 1 are the same, the angle between two adjacent positioning holes 111 is the minimum angle between the two adjacent positioning holes 111 and the axis of the limiting plate 2, and the angle between two adjacent limiting holes 21 is the minimum angle between the two adjacent limiting holes 21 and the axis of the limiting plate 2.

[0052] The arrangement of the limiting hole 21 and the positioning hole 111 satisfies:

[0053] αm=βn-γk;

[0054] Among them, α is the angle between two adjacent positioning holes 111, β is the angle between two adjacent limiting holes 21, γ is the limiting angle interval, m represents the mth positioning hole 111, n represents the nth limiting hole 21, k represents the kth limiting angle interval of rotation, and m, n and k satisfy that when k is an arbitrary integer, m and n both have integer solutions.

[0055] The limit holes 21 and the positioning holes 111 set in the above manner in the present application can meet the condition that the limit angle interval is as small as possible, reduce the setting of the positioning holes 111 and the limit holes 21, help to miniaturize the valve opening mechanical limit device, and enhance the structural strength of the bracket positioning plate 11 and the limit plate 2.

[0056] Preferably, the limiting angle interval is less than or equal to 10°, and the number of the positioning holes 111 and the number of the limiting holes 21 are both less than 20.

[0057] The side of the bracket positioning plate 11 is provided with a positioning scale line, in this embodiment, a 0° scale line. The upper surface of the limit plate 2 is provided with a scale structure, and optionally, the scale structure includes part or all of the integer scales from 0° to 360°.

[0058] In this embodiment, the bracket positioning plate 11 has 18 positioning holes 111 evenly distributed circumferentially, that is, the angle between two adjacent positioning holes 111 is 20°; the limiting plate 2 has 8 limiting holes 21 evenly distributed circumferentially, that is, the angle between two adjacent limiting holes 21 is 45°, and the limiting angle interval is 5°.

[0059] Whenever the limiting disk 2 rotates 5°, the hole position of the bracket positioning disk 11 is m*20°, and the hole position of the limiting disk 2 is n*45-k*5°. When the holes on the bracket positioning disk 11 and the limiting disk 2 are coaxial, m*20°= n*45-k*5°, which can be simplified to k=9n-4m. For any integer k, there are integer solutions m and n. Therefore, whenever the limiting disk 2 rotates 5°, the bracket positioning disk 11 and the limiting disk 2 have two axially symmetrical positioning holes 111 that are coaxial with the limiting hole 21. Therefore, bolts can be inserted into the axially symmetrical positioning holes 111 and the limiting holes 21 to achieve a fixed connection between the limiting disk 2 and the valve positioning bracket 1 after each rotation of 5°.

[0060] In this embodiment, Figure 4 As shown, the valve positioning bracket 1 also includes:

[0061] A bracket connecting rod 12, one end of which is fixedly connected to the bracket positioning plate 11;

[0062] The bracket upper plate 13 is fixedly connected to the other end of the bracket connecting rod 12 .

[0063] The limiting plate 2 is arranged between the bracket upper plate 13 and the bracket positioning plate 11 .

[0064] In this embodiment, both the bracket upper plate 13 and the bracket positioning plate 11 are provided with an axial hole for inserting the connecting shaft 3, and the diameter of the axial hole is larger than the diameter of the connecting shaft 3 and smaller than the length of the limiting rod 4. The bracket upper plate 13 and the bracket positioning plate 11 are also provided with waist holes to achieve fixed connection between the valve positioning bracket 1 and the valve body through fasteners.

[0065] In this embodiment, both ends of the bracket connecting rod 12 are welded to the bracket connecting rod 12 and the bracket upper plate 13 respectively. At least two bracket connecting rods 12 are provided, and the bracket connecting rods 12 surround the axial hole in the bracket positioning plate 11.

[0066] Optionally, the bracket connecting rod 12 can be arranged in the limiting cavity or outside the limiting cavity. As another embodiment, the valve positioning bracket 1 includes a bracket positioning plate 11 and a bracket upper plate 13, and the bracket connecting rod 12 is not arranged. The structure of the bracket upper plate 13 is the same as that of the bracket positioning plate 11. The bracket positioning plate 11, the limiting plate 2 and the bracket upper plate 13 are fixedly connected to the valve positioning bracket 1 and the bracket positioning plate 11 and the bracket upper plate 13 by bolts passing through the corresponding limiting holes 21 and positioning holes 111.

[0067] In this embodiment, the support positioning plate 11 is in the shape of a disc, and the limiting plate 2 is also in the shape of a disc. Optionally, the support positioning plate 11 and the limiting plate 2 may also be in a rectangular or other irregular shape.

[0068] In this embodiment, the limiting plate 2 is a split type, including a first plate structure and a second plate structure. The limiting plate 2 is formed by combining the first plate structure and the second plate structure. The first plate structure and the second plate structure are both provided with connecting parts, and the connecting parts are provided with bolt holes or through holes. The first plate structure and the second plate structure can be detachably connected by bolts.

[0069] In this embodiment, threads are arranged on the surface of the limiting rod 4 , and a threaded hole matching with the limiting rod 4 is arranged in the connecting shaft 3 . The limiting rod 4 is fixedly connected with the connecting shaft 3 through the threaded hole.

[0070] In this embodiment, the valve positioning bracket 1, the limiting plate 2, the connecting shaft 3 and the limiting rod 4 are made of 40CrNiMoA material and subjected to quenching and tempering treatment. The valve positioning bracket 1 and the limiting plate 2 are subjected to oxidation treatment, and the connecting shaft 3 and the limiting rod 4 are also subjected to sulfur-nitrogen co-diffusion treatment and oxidation treatment.

[0071] A valve, comprising:

[0072] A valve body, the valve body being connected to the valve positioning bracket 1;

[0073] A transmission device connected to the upper end of the connecting shaft 3;

[0074] A valve stem, wherein the valve stem is connected to the lower end of the connecting shaft 3.

[0075] The other structures of the valve can be referred to the prior art and will not be described in detail in this application.

[0076] A limiting method, applied to the valve opening mechanical limiting device or the valve, comprises the following steps:

[0077] According to the required rotation limit angle, adjust the limit plate 2 to the required limit angle;

[0078] Connect the limit plate 2 and the bracket positioning plate 11 through fasteners;

[0079] When the connecting shaft 3 rotates to the limiting angle, the limiting plate 2 comes into contact with the limiting rod 4 on the connecting shaft 3 and prevents the limiting rod 4 from further rotating.

[0080] The preparation of the valve or the valve opening mechanical limit device includes the following steps:

[0081] The limiting hole 21 and the positioning hole 111 are set according to the following formula:

[0082] αm=βn-γk;

[0083] Among them, α is the angle between two adjacent positioning holes 111, β is the angle between two adjacent limiting holes 21, γ is the limiting angle interval, m represents the mth positioning hole 111, n represents the nth limiting hole 21, k represents the kth limiting angle interval of rotation, and m, n and k satisfy that when k is an arbitrary integer, m and n both have integer solutions.

[0084] At the same time, both the positive and negative ratios of the angle between two adjacent positioning holes 111 and the angle between two adjacent limiting holes 21 have decimals.

[0085] In this embodiment, when the minimum opening limit of the valve is 50°, the 50° scale on the limit plate 2 is aligned with the scale line on the scale plate of the valve positioning bracket 1. At this time, the hole position with an angle of 0° is the first hole, the angle of the third hole of the positioning plate 1 is 40°, the angle of the third hole of the limit plate 2 is 40°, and they are coaxial. The angles of the twelfth hole of the positioning plate 1 and the seventh hole of the limit plate 2 are both 120°, and they are coaxial. The positioning plate 1 and the limit plate 2 can be fixed to each other with external hexagonal bolts.

[0086] When the valve opening is gradually closed to 50°, the limit plate 2 comes into contact with the limit rod 4 and prevents the limit rod 4 from continuing to rotate. The connecting shaft 3 and the limit rod 4 interfere with each other and cannot rotate, thereby achieving the limiting effect.

[0087] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A valve opening mechanical limit device, characterized in that: include: The valve positioning bracket comprises a bracket positioning plate, and the bracket positioning plate is provided with a plurality of positioning holes evenly distributed in the circumferential direction; the valve positioning bracket can be connected to the valve body; A limiting plate, wherein a limiting portion is arranged inside the limiting plate, and a plurality of limiting holes are evenly distributed on the limiting plate in the circumferential direction, wherein the positioning holes and the limiting holes are used to realize a fixed connection between the bracket positioning plate and the limiting plate; A connecting shaft, the connecting shaft penetrates into the valve positioning bracket and the limit plate and is rotatably connected to the valve positioning bracket; the connecting shaft is used to connect to the transmission device of the valve; A limit rod, the limit rod is fixedly connected to the connecting shaft, and when the valve opening is at a maximum preset opening, the limit part unidirectionally limits the rotation of the limit rod; Wherein, the positive and negative ratios of the angle between two adjacent positioning holes and the angle between two adjacent limiting holes both have decimals; the arrangement of the limiting holes and the positioning holes satisfies: αm=βn-γk; Among them, α is the angle between two adjacent positioning holes, β is the angle between two adjacent limiting holes, γ is the limiting angle interval, and when k is an arbitrary integer, both m and n have integer solutions.

2. The valve opening mechanical limit device according to claim 1, characterized in that: The limiting angle interval is less than or equal to 10°, and the number of the positioning holes and the limiting holes are both less than 20.

3. The valve opening mechanical limit device according to claim 2, characterized in that: The bracket positioning plate has 18 positioning holes evenly distributed circumferentially, and the angle between two adjacent positioning holes is 20°; the limiting plate has 8 limiting holes evenly distributed circumferentially, and the angle between two adjacent limiting holes is 45°.

4. The valve opening mechanical limit device according to claim 2, characterized in that: The valve positioning bracket also includes: A bracket connecting rod, one end of which is fixedly connected to the bracket positioning plate; The support upper plate is fixedly connected to the other end of the support connecting rod.

5. The valve opening mechanical limit device according to claim 4, characterized in that: A positioning scale line is arranged on the side of the bracket positioning plate, and a scale structure is arranged on the limiting plate.

6. The valve opening mechanical limit device according to claim 4, characterized in that: A limiting cavity is formed in the limiting disk, and the limiting rod is arranged in the limiting cavity.

7. The valve opening mechanical limit device according to claim 6, characterized in that: The limiting plate is formed by combining a first plate structure and a second plate structure, and the first plate structure and the second plate structure are connected in a detachable manner.

8. The valve opening mechanical limit device according to claim 6, characterized in that: The limiting rod is provided with a thread, the connecting shaft is provided with a threaded hole matched with the limiting rod, and the limiting rod is fixedly connected to the connecting shaft through the threaded hole.

9. A valve, characterized in that: It comprises the valve opening mechanical limiting device as described in any one of claims 1-8.

10. A method for mechanically limiting valve opening, characterized in that: Applicable to the valve opening mechanical limit device according to any one of claims 1 to 8 or the valve according to claim 9; There are 18 positioning holes evenly distributed on the circumferential direction of the bracket positioning plate, and the angle between two adjacent positioning holes is 20°. There are 8 limiting holes evenly distributed on the circumferential direction of the limiting plate, and the angle between two adjacent limiting holes is 45°. When the positioning plate and the limiting plate are aligned at 0°, at least two positioning holes are coaxial with the limiting holes. The valve opening mechanical limiting method comprises the following steps: According to the required rotation limit angle, adjust the limit plate to the required limit angle; Connect the limit plate and the bracket positioning plate through fasteners; When the connecting shaft rotates to the limiting angle, the limiting plate contacts the limiting rod and prevents the limiting rod from rotating further.

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