Limiting structure for online addition of adjustable valve

Abstract

The utility model relates to the field of chemical process control, and discloses an on-line adding adjustable valve limiting structure which comprises a valve body and a valve rod, a valve rod connecting piece is arranged at the bottom of the valve rod, a limiting mechanism is arranged at the bottom of the valve rod connecting piece, and the limiting mechanism comprises an inner layer adjusting block. An outer thread is arranged on the outer side of the inner-layer adjusting block, an outer-layer adjusting block is connected to the outer side of the inner-layer adjusting block in a threaded mode, an inner thread is arranged on the inner side of the outer-layer adjusting block, two outer-layer half fixing holes are fixedly connected to the two sides of the outer-layer adjusting block, and the valve rod is used for being connected with an actuator and a valve element. Force is transmitted to adjust the position of the valve element. According to the utility model, through the customized design of the sizes of the valve rod connecting piece and the valve rod, the accurate adjustment of the valve position is realized, other structures of the valve are not influenced, and the valve has universality and compatibility; the design of multi-layer nesting, threaded connection and vertical subdivision is adopted, limiting blocks can be added at any time, the opening degree can be flexibly adjusted, the adaptability is wide, and adjustment is convenient.

Description

Technical Field

[0001] The utility model relates to the field of chemical process control, in particular to an online adding adjustable valve limit structure. Background Art

[0002] In process control in chemical plants, linear control valves are widely used to regulate media flow and stabilize process parameters. Their actuators typically operate in a linear motion. A linear control valve regulates fluid flow by driving the valve stem in linear motion. Its basic structure consists of a valve body, stem, valve core, valve seat, actuator, and bonnet. The valve body is the primary component of the fluid passage. The valve stem connects the actuator and valve core, transmitting force to adjust the valve core position, thereby controlling fluid flow. The actuator is typically composed of pneumatic, electric, or hydraulic devices, while a positioner precisely controls the actuator's movement. The bonnet seals and protects internal components, ensuring safe operation under high-pressure or high-temperature conditions. Linear control valves offer a simple structure, fast response, and high regulation accuracy, making them key components in industrial automation control systems.

[0003] This online adjustable valve limiter utilizes a modular design and is quickly secured to the actuator and valve stem connection using clamping, slotting, or magnetic adsorption. It offers strong adaptability and easy installation. The structure incorporates an adjustable slide, limit screw, or block, which, through manual adjustment, precisely limits the vertical motion of the valve stem. Combined with graduated markings and a locking mechanism, the operator can flexibly adjust the valve opening according to process requirements while maintaining stability after adjustment. This entire process eliminates the need to disassemble the pipeline or shut down the equipment, significantly improving maintenance efficiency and adjustment accuracy.

[0004] In the existing technology, during the use of straight-stroke control valves, if the actuator or positioner fails, the valve usually exists in a faulty form and stays in the fully open or fully closed state, which makes it difficult to meet the process control requirements. If the limit bolt is not set at the beginning of the design, the only way is to add a stop block online and fix it between the valve stem connector and the actuator or the pressure cover to limit the movement of the valve stem. However, this method has obvious shortcomings: first, it is difficult to flexibly adjust the valve opening after the stop block is fixed, and the adjustment accuracy is low, which makes it difficult to meet the needs of precise control; second, long-term use may cause wear or damage to the valve components, affecting the life of the equipment; third, there is a lack of modular and convenient design, and the operation is complicated and inefficient. These defects are particularly prominent under working conditions where shutdown processing is impossible, and an efficient and flexible limit solution is urgently needed.

[0005] In view of the above problems, an online adjustable valve limit structure is proposed to solve the above problems. Utility Model Content

[0006] In order to make up for the above shortcomings, the utility model provides an online adjustable valve limit structure, which aims to solve the problems in the prior art of valve malfunction caused by actuator or positioner failure, and the low adjustment accuracy, complex operation and difficult adjustment of the traditional block fixing method.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: an online adjustable valve limit structure, comprising a valve body and a valve stem, a valve stem connector is provided at the bottom of the valve stem, and a limit mechanism is provided at the bottom of the valve stem connector;

[0008] The limiting mechanism includes an inner layer adjustment block, the outer side of the inner layer adjustment block is provided with an external thread, the outer side of the inner layer adjustment block is threadedly connected to the outer layer adjustment block, the inner side of the outer layer adjustment block is provided with an internal thread, and both sides of the outer layer adjustment block are fixedly connected with two half outer layer fixing holes.

[0009] As a further description of the above technical solution:

[0010] The valve stem is used to connect the actuator and the valve core and transmit force to adjust the position of the valve core.

[0011] As a further description of the above technical solution:

[0012] A bracket is provided at the bottom of the actuator, and a limiting mechanism and a valve stem connecting piece are provided inside the bracket.

[0013] As a further description of the above technical solution:

[0014] The valve stem connecting piece is located on the top of the inner layer adjusting block.

[0015] As a further description of the above technical solution:

[0016] The top of the valve body is connected to the valve cover through a plurality of bolts.

[0017] As a further description of the above technical solution:

[0018] The inner layer adjustment block and the outer layer adjustment block both adopt a half-split structure.

[0019] As a further description of the above technical solution:

[0020] The two outer layer adjustment blocks are fixed with the two half fixing holes of the outer layer via a connecting piece.

[0021] As a further description of the above technical solution:

[0022] The valve stem slides inside the valve body.

[0023] The utility model has the following beneficial effects:

[0024] 1. In the utility model, the dimensions of the valve stem connector and the valve stem are customized, which has no effect on other valve structures. It has universality and compatibility, is easy to adjust, and limit blocks can be added at any time according to the valve stroke length. It has strong flexibility and wide adaptability.

[0025] 2. This device features a large adjustable margin. By adjusting the height of the internal stopper against the stem connector, precise adjustment of the valve position is achieved. The device utilizes a multi-layer nested structure with threaded connections and a vertically split design. The diameter and number of stoppers can be customized based on the dimensions of the valve stem and stem connector, as well as the length of the valve stroke, ensuring the valve operates within a specified opening range. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a three-dimensional schematic diagram of an online adjustable valve limit structure proposed by the utility model;

[0027] Figure 2 This is a structural diagram of an external thread for adding an online adjustable valve limit structure proposed by the utility model;

[0028] Figure 3 This is a structural diagram of the outer two halves of the fixed holes of an online adjustable valve limit structure proposed by the present invention;

[0029] Figure 4 This is a structural schematic diagram of an outer regulating block with an online adjustable valve limit structure proposed by the utility model.

[0030] Legend:

[0031] 1. Valve body; 2. Valve stem; 3. Valve stem connector; 4. Limiting mechanism; 401. Inner adjustment block; 402. External thread; 403. Outer adjustment block; 404. Internal thread; 405. Outer two halves fixing holes; 5. Valve cover; 6. Actuator; 7. Bracket; 8. Bolts. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Reference Figure 1 - Figure 4The utility model provides an embodiment: an online adjustable valve limit structure, comprising a valve body 1 and a valve stem 2. The bottom of the valve stem 2 is connected to a valve stem connector 3, which is connected to a limit mechanism 4 for achieving precise adjustment of the valve opening. The limit mechanism 4 is composed of an inner adjustment block 401 and an outer adjustment block 403, wherein the outer side of the inner adjustment block 401 is provided with an external thread 402, which is threadedly connected to cooperate with the internal thread 404 of the outer adjustment block 403 to form a stable and adjustable structure. Both the inner adjustment block 401 and the outer adjustment block 403 adopt a half-split structure design, which is convenient for installation and disassembly, while reducing maintenance costs. The two sides of the outer adjustment block 403 are fixedly connected with two outer half fixing holes 405, and the two outer half fixing holes 405 are fixed by connecting plates to further enhance the stability of the limit mechanism 4. The valve stem connector 3, located at the top of the inner adjustment block 401, is designed to assist in connecting the valve stem 2 to the actuator 6 and the valve core, transmitting force to adjust the valve core position and ensure accurate valve operation. A bracket 7 is mounted at the bottom of the actuator 6. This bracket 7 houses both the position limiter 4 and the valve stem connector 3, creating a compact and easily adjustable overall layout. The valve stem 2 can slide within the valve body 1 to accommodate various operating conditions and operational requirements. The top of the valve body 1 is tightly connected to the valve cover 5 via several bolts 8, forming a reliable seal that prevents external interference with the valve's internal operation.

[0034] Working Principle: The valve opening is precisely adjusted through the limiting mechanism 4, which consists of an inner adjustment block 401 and an outer adjustment block 403. Height adjustment is achieved through a threaded connection to ensure the stability and adjustability of the limiting mechanism 4. The valve stem connector 3 connects the valve stem 2 to the actuator 6 and the valve core, and is used to transmit force to adjust the position of the valve core, thereby controlling the valve opening. The bracket 7 at the bottom of the actuator 6 accommodates the limiting mechanism 4 and the connector, resulting in a compact overall layout and flexible operation. The valve stem 2 can slide inside the valve body 1, which is connected to the valve cover 5 via bolts 8 to form a sealing structure, effectively preventing external interference and ensuring the precise operation of the equipment.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An online adjustable valve limit structure, comprising a valve body (1) and a valve stem (2), characterized in that: A valve stem connecting piece (3) is provided at the bottom of the valve stem (2), and a limiting mechanism (4) is provided at the bottom of the valve stem connecting piece (3); The limiting mechanism (4) comprises an inner layer adjusting block (401), an outer side of the inner layer adjusting block (401) is provided with an external thread (402), the outer side of the inner layer adjusting block (401) is threadedly connected to an outer layer adjusting block (403), an inner side of the outer layer adjusting block (403) is provided with an internal thread (404), and both sides of the outer layer adjusting block (403) are fixedly connected with two outer layer fixing holes (405).

2. The online adjustable valve limiting structure according to claim 1, characterized in that: The valve stem (2) is used to connect the actuator (6) and the valve core, and transmit force to adjust the position of the valve core.

3. The online adjustable valve limiting structure according to claim 2, characterized in that: A bracket (7) is provided at the bottom of the actuator (6), and a limiting mechanism (4) and a valve stem connecting piece (3) are provided inside the bracket (7).

4. The online adjustable valve limiting structure according to claim 1, characterized in that: The valve stem connecting piece (3) is located on the top of the inner layer adjustment block (401).

5. The online adjustable valve limiting structure according to claim 1, characterized in that: The top of the valve body (1) is connected to the valve cover (5) via a plurality of bolts (8).

6. The online adding adjustable valve limiting structure according to claim 1, characterized in that: The inner layer adjustment block (401) and the outer layer adjustment block (403) both adopt a half-split structure.

7. The online adjustable valve limiting structure according to claim 1, characterized in that: The two outer layer adjustment blocks (403) are fixed to the two outer layer fixing holes (405) via a connecting piece.

8. The online adding adjustable valve limit structure according to claim 1, characterized in that: The valve stem (2) slides inside the valve body (1).

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