Stop valve

Abstract

A stop valve mainly comprises a valve body, a valve cover, a flashboard, a valve rod and an executing mechanism, the valve rod is connected with the flashboard, the executing mechanism controls the valve rod to move so as to drive the flashboard to open and close the valve, a middle cavity opening of the valve body is of a valve body hemispherical shell structure, correspondingly, a middle cavity opening of the valve cover is of a valve cover hemispherical shell structure, and a middle cavity is a sphere after the valve cover and the valve cover are matched. The use reliability of the valve is improved, and the service life of the valve is prolonged. And a better guarantee is provided for normal work of the device.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, specifically a shut-off valve, which is mainly used in the petroleum, chemical and other fields. Background Technology

[0002] In the petrochemical industry, many units use working media that are high-temperature, high-flow-rate, and prone to adhesion. These special shut-off valves play a crucial role as opening and closing elements in these units. They directly impact the processes of downstream units, and precise control of the media flow rate is essential for subsequent operations. During unit operation, due to the characteristics of the working media—such as easy adhesion, high temperature, and high flow rate—abnormal pressure increases can occur within the valve cavity when the valve is opened or closed, leading to valve cavity deformation and ultimately, valve seal failure.

[0003] Due to the characteristics of the medium, the valve's passage, cavity, and gate experience severe erosion and wear, which is difficult to remove, thus shortening the valve's lifespan. The inner surface and guide rails in contact with the medium will adhere and coke; medium easily accumulates at the bottom of the valve. When the valve opens and closes, this causes severe wear on the sealing surface, leading to leakage; excessive accumulation at the bottom of the valve can cause incomplete closure and further leakage; and coking on the valve guide rails can cause jamming during gate movement. This necessitates frequent valve replacements and affects the normal operation of the equipment.

[0004] In general, conventional products do not adequately protect the valve's sealing system, and the medium adhering to the inner wall of the valve cavity cannot be removed. With prolonged operation, the valve is subjected to erosion and wear from the medium, and the valve cavity is prone to pressure rise, deformation, and leakage. This not only causes internal leakage affecting downstream processes but also leads to external leakage, increasing safety hazards in production. Utility Model Content

[0005] This invention provides a shut-off valve that improves the reliability of valve use and extends its service life. It also provides better protection for the normal operation of the device.

[0006] The present invention adopts the following technical solution:

[0007] A shut-off valve mainly includes a valve body, a valve cover, a gate, a valve stem, and an actuator. The valve stem is connected to the gate, and the actuator controls the movement of the valve stem to drive the gate to open and close the valve. The central cavity of the valve body is a valve body hemispherical shell structure, and correspondingly, the central cavity of the valve cover is also a valve cover hemispherical shell structure. When the two are combined, the central cavity forms a sphere.

[0008] The valve body is provided with several multi-angle valve body branch channels, specifically: valve body branch channels are provided in the horizontal direction on both sides of the sealing surface channel, and valve body branch channels are provided at the bottom of the valve body; the valve body branch channels are externally connected to a dual-level high-flow precision control system.

[0009] The valve cover is provided with several multi-angle valve cover branch channels, specifically: valve cover branch channels are provided at 45° on both sides of the sealing surface of the valve cover, valve cover branch channels are provided at the packing spacer position in the stuffing box, and each valve cover branch channel is connected to a dual-level high-flow precision control system.

[0010] The dual-level high-flow precision control system is divided into a first-level high-flow precision control system and a second-level high-flow precision control system. The first-level high-flow precision control system includes a positive flange, one end of which is connected to a reverse flange through a sealing flow-limiting orifice plate. The second-level high-flow precision control system consists of a flow control and pressure relief valve connected to the other end of the reverse flange.

[0011] The neck of the valve cover is extended from the bottom of the stuffing box and a temperature-controlled heat sink is provided on the outer wall of the neck.

[0012] The part of the gate plate that comes into contact with the working medium is coated with a chromium carbide layer, and a high-temperature wear-resistant lining is provided in the recesses on both sides of the gate plate.

[0013] This invention effectively solves the problems of poor sealing performance caused by abnormal pressure rise in the valve cavity during opening and closing when process pipeline media (high-temperature, high-flow-rate, and easily sticky media) pass through the valve cavity of a shut-off valve, as well as problems such as severe wear of the sealing surface due to the characteristics of the media, incomplete closure, and movement jamming. This invention improves the reliability of valve use and extends the service life of the valve. It also provides better protection for the normal operation of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 for Figure 1 Side view;

[0016] Figure 3 This is a schematic diagram of the valve body structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the valve cover structure of this utility model;

[0018] Figure 5 for Figure 4 Side view;

[0019] Figure 6 This is a schematic diagram of the dual-level high-flow precision control system of this utility model;

[0020] Figure 7 This is a schematic diagram of the gate of this utility model;

[0021] Figure 8 This is a schematic diagram of the spherical structure at the center of the hole in this utility model;

[0022] In the diagram: 1-Valve body, 2-Gate, 3-Valve stem, 4-Valve cover, 5-Temperature control radiator, 6-Packing, 7-Bracket, 8-Actuator, 9-Dual-stage high-flow precision control system, 10-Valve body branch passage, 11-Valve body hemispherical shell structure, 12-Valve cover hemispherical shell structure, 13-Valve cover neck, 14-Valve cover branch passage, 15-Positive flange, 16-Reverse flange, 17-Flow control and pressure relief valve, 18-Sealing flow limiting orifice plate, 19-High-temperature wear-resistant lining, 20-Sprayed chromium carbide layer. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0024] Reference Figure 1 , Figure 2 , Figure 8 A shut-off valve mainly includes a valve body 1, a valve cover 4, a gate 2, a valve stem 3, and an actuator 8. The valve stem 3 is connected to the gate 2, and the actuator 8 controls the movement of the valve stem 3, thereby driving the gate 2 to open and close the valve. The central cavity of the valve body 1 is a valve body hemispherical shell structure 11, and correspondingly, the central cavity of the valve cover is also a valve cover hemispherical shell structure 12. When the two are combined, the central cavity is spherical. This shape design makes the central cavity space larger than that of conventional designs, which can accommodate more media. The spherical design shape is more stable, with less deformation and higher strength, which can prevent the problem of sealing failure caused by abnormal pressure rise in the central cavity. It is also more conducive to removing the working medium adhering to the valve cavity wall.

[0025] The valve body 1 and valve cover 4 are sealed by an octagonal ring connection between the flanges. This seal provides good performance, has a simple structure, and is suitable for operating conditions with large temperature fluctuations. This structure allows for better purging of the medium adhering to the inner wall of the valve through a dual-stage high-flow precision control system, while also ensuring the valve's seal.

[0026] Reference Figure 3 The valve body 1 is provided with several multi-angle valve body branch channels 10. Specifically, one valve body branch channel 10 is designed horizontally on each side of the sealing surface channel to protect the side channels. Another valve body branch channel 10 is designed at the bottom of the valve body to prevent the accumulation of medium at the bottom. It also allows for bottom-level purging of the sealing surface, protecting the left and right sealing surfaces of the valve body and reducing wear. Furthermore, it protects the guide rails of the valve body and the gate plate, preventing the working medium from adhering, thus preventing jamming of the insulation gate plate 2 and incomplete closure, leading to leakage. This valve body branch channel 10 is externally connected to a dual-level high-flow precision control system 9 to accurately control the flow rate of the protective medium.

[0027] Reference Figure 4 , Figure 5The valve cover 4 is provided with several multi-angle valve cover branch channels 14. Specifically, valve cover branch channels 14 are provided at 45° angles on both sides of the sealing surface of the valve cover 4 to protect the upper sealing surface of the valve cover, the inner surface of the valve cover, and the sealing surface of the valve body. The valve cover branch channels 14 are used to purge and protect the valve body cavity and the valve body sealing surface from top to bottom. Valve cover branch channels 14 are provided at the packing spacer in the stuffing box to prevent media leakage caused by damage to the packing and the upper sealing surface. Each valve cover branch channel 14 is connected to a dual-level high-flow precision control system 9 to accurately control the flow rate of the protective medium.

[0028] Reference Figure 6 The dual-level high-flow precision control system 9 is divided into a first-level high-flow precision control system and a second-level high-flow precision control system. The first-level high-flow precision control system includes a positive flange 15, one end of which is connected to a sealing flow-limiting orifice plate 18 and a reverse flange 16. This layer controls the purging flow rate of the protective medium, which is the maximum flow rate that protects the valve cavity from the adhesion of the working medium. The other end of the positive flange 15 is connected to the valve body branch channel 10 and the valve cover branch channel 14.

[0029] The second-level high-flow precision control system is as follows: the other end of the anti-flange 16 is connected to the flow control and pressure relief valve 17, which controls the flow according to the different properties of the protective medium, protects the valve with an appropriate flow, and also reasonably controls the flow of the protective medium according to the characteristics of different working media.

[0030] The flow control and pressure relief valve 17 can not only more accurately control the flow of the protected medium, but also relieve pressure when the valve cavity is pressurized to a certain level.

[0031] When the valve is opened or closed, the valve cavity may experience abnormal pressure rise due to the characteristics of the working medium. When the pressure in the valve cavity is higher than the flow pressure of the protected medium, the flow control and pressure relief valve 17 releases pressure to the outside to ensure that the valve cavity is within a normal and controllable pressure range.

[0032] Reference Figure 1 , Figure 4 , Figure 5 The neck 13 of the valve cover 4 is extended from the bottom of the stuffing box, and a temperature-controlled heat dissipation fin 5 is provided on the outer wall of the neck. This can reduce the temperature inside the stuffing box, ensure the reliability of the packing seal, and extend the service life of the packing 6.

[0033] Reference Figure 7 The portion of the gate plate 2 that comes into contact with the working medium is coated with a chromium carbide layer 20, and high-temperature wear-resistant linings 19 are provided in the recesses on both sides of the gate plate 2. This improves the gate plate 2's resistance to erosion, high temperature resistance, and wear resistance of the sealing surface, thereby enhancing the gate plate's performance.

Claims

1. A shut-off valve, mainly comprising a valve body, a valve cover, a gate, a valve stem, and an actuator, wherein the valve stem is connected to the gate, and the actuator controls the movement of the valve stem to drive the gate to open and close the valve, characterized in that, The valve body (1) has a hemispherical shell structure (11) in the middle cavity. Correspondingly, the valve cover has a hemispherical shell structure (12) in the middle cavity. When the two are combined, the middle cavity is spherical.

2. A shut-off valve according to claim 1, characterized in that, The valve body (1) is provided with several multi-angle valve body branch channels (10), specifically: valve body branch channels (10) are provided on both sides of the sealing surface channel in the horizontal direction, and valve body branch channels (10) are provided at the bottom of the valve body; the valve body branch channel (10) is connected to a dual-level high flow precision control system (9).

3. A shut-off valve according to claim 1, characterized in that, The valve cover (4) is provided with several multi-angle valve cover branch channels (14), specifically: valve cover branch channels (14) are provided at 45° on both sides of the sealing surface on the valve cover (4), valve cover branch channels (14) are provided at the packing spacer in the stuffing box, and each valve cover branch channel (14) is connected to a dual-level high flow precision control system (9).

4. A shut-off valve according to claim 2 or 3, characterized in that, The dual-level high-flow precision control system (9) is divided into a first-level high-flow precision control system and a second-level high-flow precision control system; the first-level high-flow precision control system includes a positive flange (15), one end of which is connected to a sealing flow limiting orifice plate (18) and a reverse flange (16); The second-level high-flow precision control system is as follows: the other end of the anti-flange (16) is connected to the flow control and pressure relief valve (17).

5. A shut-off valve according to claim 1, characterized in that, The neck (13) of the valve cover (4) is extended from the bottom of the stuffing box and a temperature-controlled heat sink (5) is provided on the outer wall of the neck.

6. A shut-off valve according to claim 1, characterized in that, The part of the gate (2) that comes into contact with the working medium is coated with a chromium carbide layer (20), and a high-temperature wear-resistant lining (19) is provided in the recesses on both sides of the gate (2).

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