Emergency cut-off valve with three-piece type compact valve element structure

Abstract

The utility model discloses an emergency cut-off valve with a three-piece type compact valve core structure, which comprises a valve body and a valve cover connected with the valve body, a pneumatic actuating mechanism is arranged above the valve cover, the pneumatic actuating mechanism is connected with a valve rod, the lower end of the valve rod is connected with a wedge-shaped block, the middle part of the wedge-shaped block is provided with a waist-shaped groove, and the waist-shaped groove is connected with the valve cover. The wedge-shaped block is provided with a kidney-shaped groove, flashboards are arranged on the two sides of the wedge-shaped block, the flashboards are provided with limiting rods inserted into the kidney-shaped groove, the two sides of the wedge-shaped block are arranged to be inclined faces, and the flashboards are provided with guide grooves used for containing the wedge-shaped block. The utility model has the advantages of compact structure, good sealing effect, stability and reliability, and emergency cut-off.

Description

Technical Field

[0001] This utility model relates to the field of shut-off valves, specifically an emergency shut-off valve with a three-piece compact valve core structure. Background Technology

[0002] Because of the excellent sealing performance on both the inlet and outlet sides of the valve, the medium entering the valve cavity is sealed within it. Under external heat, the temperature of the medium inside the cavity rises, causing the sealed medium to gradually change from a cold state to a hot state, and liquids may vaporize. The gas expands rapidly, but since the volume of the cavity cannot increase, the pressure inside the valve cavity rises sharply, causing the pressure to be several times higher than the nominal pressure. This can affect the normal opening of the valve, and in severe cases, damage the valve's pressure-bearing components, opening components, and actuators. To address these issues, a patent with publication number 220037499 discloses a resilient internal pressure relief double-gate valve, which solves the aforementioned technical problems.

[0003] First, an improved emergency shut-off valve with a three-piece compact valve core structure is proposed. The differences between the three-piece compact valve core structure emergency shut-off valve and the resilient internal pressure relief double gate valve are as follows:

[0004] 1. Different structural components: The elastic internal pressure relief double gate valve adopts a conventional double gate structure, with internal components consisting of five parts: two sealing discs, two expansion blocks, and a wedge block; the three-piece compact valve core consists of three parts: two gates and a wedge block. The three-piece compact valve core has fewer parts, improving product processing efficiency; the force transmission between parts is more efficient, resulting in better valve sealing performance.

[0005] 2. Different applicable diameter range: The conventional double gate valve internal structure consists of five parts. When used in small diameter valves, it is difficult to guarantee the machining accuracy of the parts and the sealing performance is unstable. The three-piece compact valve core is often used in small diameter valves ≤4 inches. It has fewer internal parts, the parallelism of the two gates is easier to control, and the product performance is stable and reliable.

[0006] 3. Different functions: The resilient internal pressure relief double gate valve mainly addresses the requirement for pressure relief in the valve cavity. The three-piece compact valve core structure provides bidirectional sealing and, when used with a pneumatic actuator, also includes an emergency shut-off function. Utility Model Content

[0007] The purpose of this utility model is to provide an emergency shut-off valve with a three-piece compact valve core structure to solve the problems mentioned in the background art. It has the advantages of good sealing effect and stable reliability.

[0008] To achieve the above objectives, this utility model provides the following technical solution: an emergency shut-off valve with a three-piece compact valve core structure, comprising a valve body and a valve cover connected to the valve body, a pneumatic actuator is provided above the valve cover, a valve stem is connected to the pneumatic actuator, a wedge block is connected to the lower end of the valve stem, a waist-shaped groove is provided in the middle of the wedge block, gate plates are provided on both sides of the wedge block, a limiting rod is provided on the gate plate and inserted into the waist-shaped groove, the two sides of the wedge block are set as inclined surfaces, and the gate plate is provided with a guide groove for accommodating the wedge block.

[0009] Preferably, the valve stem is fitted with a split ring, and the valve stem is fitted with a threaded sleeve located on the upper side of the split ring. The upper part of the wedge block is circular and threadedly connected to the threaded sleeve.

[0010] Preferably, the wedge-shaped block has a through hole inside, and a first spring and a push rod are disposed inside the through hole.

[0011] Preferably, the pneumatic actuator is a cylinder, which contains a piston body. The piston body is connected to a piston rod, which is connected to a valve rod. A second spring is provided above the piston body.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This design features a three-piece compact valve core structure, primarily composed of a wedge block and two gates. The wedge block has a round head and beveled surfaces on both the front and rear sides. These beveled surfaces undergo surface hardening treatment, resulting in high wear resistance and extending the valve's service life. A grooved structure is used between the wedge block and the gate, allowing the wedge block room to continue moving downwards after the gate is in position, ensuring reliable valve sealing.

[0014] 2. A through hole is provided in the middle of the wedge block, and a spring and push rod structure is provided in the middle of the through hole to prevent the left and right gates from moving on the same line when the valve flow channel is pressurized.

[0015] 3. This design has two gates, left and right, with sealing rings on both sides. The overall outline of the gate is cylindrical, and a guide groove is provided at the connection with the wedge block to prevent the sealing disc from swinging left and right during the opening and closing of the valve.

[0016] 4. The connection between the valve stem and the wedge block is equipped with a threaded sleeve and a split ring structure, which ensures good centering during the output force transmission process, increases the connection strength, and makes processing more convenient;

[0017] 5. The valve body is equipped with an integrally cast guide rib structure, which provides precise guidance during the valve opening and closing process;

[0018] 6. The valve adopts a two-module design with the valve body and the pneumatic actuator, which facilitates maintenance and replacement;

[0019] 7. The actuator is equipped with a spring, which allows the valve to close quickly in case of a gas supply failure, providing an emergency shut-off function. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0021] Figure 2 This is a schematic diagram illustrating the connection relationship between the gate, wedge block, valve stem, split ring, and threaded sleeve in the embodiment.

[0022] In the diagram: 1. Valve body; 2. Valve seat; 3. Push rod; 4. First spring; 5. Gate; 6. Limiting pin; 7. Wedge block; 8. Split ring; 9. Screw sleeve; 10. Valve stem; 11. Valve cover; 12. Clamping block; 13. Bracket; 14. Piston body; 15. Second spring; 16. Pneumatic actuator; 17. Waist-shaped groove; 18. Limiting rod; 19. Guide groove; 20. Piston rod. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In this embodiment of the utility model,

[0025] An emergency shut-off valve with a three-piece compact valve core structure, such as Figures 1-2 As shown, the device includes a valve body 1 and a valve cover 11 connected to the valve body 1. A pneumatic actuator 16 is provided above the valve cover 11. The pneumatic actuator 16 is connected to a valve stem 10. A wedge block 7 is connected to the lower end of the valve stem 10. A waist-shaped groove 17 is provided in the middle of the wedge block 7. Gate plates 5 are provided on both sides of the wedge block 7. The gate plates 5 are provided with limiting rods 18 that are inserted into the waist-shaped grooves 17. The two sides of the wedge block 7 are set as inclined surfaces. The gate plates 5 are provided with guide grooves 19 for accommodating the wedge block 7.

[0026] The valve body 1 is provided with a valve seat 2 located on one side of the gate 5.

[0027] The valve stem 10 is sleeved with a split ring 8, and the valve stem 10 is sleeved with a threaded sleeve 9 located on the upper side of the split ring 8. The upper part of the wedge block 7 is circular and threadedly connected to the threaded sleeve 9.

[0028] The wedge-shaped block 7 has a through hole inside, and a first spring 4 and a push rod 3 are installed inside the through hole.

[0029] The pneumatic actuator 16 is a cylinder, and a piston body 14 is provided inside the cylinder. The piston body 14 is connected to a piston rod 20, which is connected to a valve rod 10. A second spring 15 is provided above the piston body 14.

[0030] A limit post 6 is provided inside the through hole. A bracket 13 is provided between the valve cover 11 and the pneumatic actuator 16, and a clamping block 12 is provided inside the bracket 13.

[0031] Working principle:

[0032] When the working air source enters the cylinder through the air inlet hole of the cylinder bottom cover, the piston drives the piston rod 20 to move from bottom to top under the action of compressed air. The piston rod 20 drives the valve rod 10, and the valve rod 10 drives the wedge block 7 to move upward. Under the action of the inclined surface of the wedge block 7, the gate 5 first contracts, and after the sealing surfaces separate, the valve opens. There is no friction on the sealing surfaces during the valve opening process.

[0033] When the gas supply fails, the second spring 15 pushes the piston body 14, which in turn drives the piston rod 20 to move rapidly from top to bottom. The piston rod 20 drives the valve rod 10, which in turn drives the wedge block 7 to move downwards. The gate 5 first falls to the bottom, and under the action of the inclined surface of the wedge block 7, the gate 5 moves laterally and adheres to the sealing surface of the valve seat 2, thus achieving a tight seal.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An emergency shut-off valve with a three-piece compact valve core structure, comprising a valve body (1) and a valve cover (11) connected to the valve body (1), wherein a pneumatic actuator (16) is disposed above the valve cover (11), characterized in that: The pneumatic actuator (16) is connected to a valve stem (10), and a wedge block (7) is connected to the lower end of the valve stem (10). A waist-shaped groove (17) is provided in the middle of the wedge block (7), and gate plates (5) are provided on both sides of the wedge block (7). A limiting rod (18) is provided in the gate plate (5) and inserted into the waist-shaped groove (17). The two sides of the wedge block (7) are set as inclined surfaces, and the gate plate (5) is provided with a guide groove (19) for accommodating the wedge block (7).

2. An emergency shut-off valve with a three-piece compact valve core structure according to claim 1, characterized in that: The valve stem (10) is fitted with a split ring (8), and the valve stem (10) is fitted with a threaded sleeve (9) located on the upper side of the split ring (8). The wedge block (7) is circular above and threadedly connected to the threaded sleeve (9).

3. An emergency shut-off valve with a three-piece compact valve core structure according to claim 1, characterized in that: The wedge block (7) has a through hole inside, and a first spring (4) and a push rod (3) are installed inside the through hole.

4. An emergency shut-off valve with a three-piece compact valve core structure according to claim 1, characterized in that: The pneumatic actuator (16) is a cylinder, and a piston body (14) is provided inside the cylinder. The piston body (14) is connected to a piston rod (20), and the piston rod (20) is connected to a valve rod (10). A second spring (15) is provided above the piston body (14).

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