A valve with multiple sealing functions

Abstract

The utility model belongs to valve technical field discloses a valve with multiple sealing function, including valve body and valve cover, be equipped with inlet chamber and outlet chamber on the valve body, be equipped with linear motion valve stem on the valve cover, the inner end part of valve stem is equipped with the valve core for carrying out closure to through -hole, be equipped with multiple coaxial heart arrangement multistage secondary sealing step on the valve core, the end of valve core is equipped with main level sealing surface, and main level sealing surface is equipped with metal hard sealing layer on, multistage secondary sealing step constitutes " pyramid " type, the interval between secondary sealing step and through -hole side wall reduces gradually and forms pressure reduction chamber. The utility model secondary sealing step and the interval between through -hole side wall reduce gradually and form pressure reduction chamber, and such through multiple different height secondary sealing steps form step -by -step pressure reduction, protect main sealing surface from high pressure direct impact, to have better sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve with multiple sealing functions. Background Technology

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the transport of media. They are devices that allow the media within piping and equipment to flow or stop and control their flow rate. Currently, linear valves on the market, such as gate valves and piston valves, use a drive device (manual, electric, or pneumatic) to move the valve stem linearly, changing the opening between the valve core and the valve seat, thereby regulating the flow rate or completely cutting off the media. Due to limitations in materials and manufacturing technology, after a period of use, the valve stem connection is prone to poor sealing and liquid leakage. Utility Model Content

[0003] To overcome the technical defects of the existing technology, this utility model provides a valve with multiple sealing functions. The distance between the secondary sealing steps and the side wall of the through hole decreases in sequence to form a pressure-reducing cavity. In this way, the pressure is reduced step by step through multiple secondary sealing steps of different heights, protecting the main sealing surface from direct impact of high pressure, thereby achieving a better sealing effect.

[0004] The technical solution adopted by this utility model is: a valve with multiple sealing functions, including a valve body and a valve cover. The valve body is provided with an inlet chamber and an outlet chamber, and a through hole is provided on the valve wall between the inlet chamber and the outlet chamber. The valve cover is provided with a linearly moving valve stem, and the inner end of the valve stem is provided with a valve core for closing the through hole. The valve body is provided with a mounting cavity for installing the valve cover, and a first sealing step is provided on the inner side wall of the mounting cavity. The valve cover is provided with a second sealing step corresponding to the first sealing step. Multiple sealing rings are installed between the first sealing step and the second sealing step.

[0005] The valve core is provided with multiple coaxially arranged multi-level sealing steps, and the height difference of each step in the multiple secondary sealing steps decreases by 0.5-2mm. The valve core is provided with a main sealing surface at its end, and a metal hard sealing layer is provided on the main sealing surface.

[0006] The multi-level secondary sealing steps form a "pyramid" shape, and the distance between the secondary sealing steps and the sidewall of the through hole decreases in sequence to form a pressure-reducing cavity.

[0007] Preferably, the number of layers of the secondary sealing steps is 3-5, and the surface of the secondary sealing steps is covered with a PTFE coating.

[0008] Preferably, the step angle of the secondary sealing step is 50°-55°, and the width of the multi-level secondary sealing steps is narrower at the inside and wider at the outside.

[0009] Preferably, the valve cover and the valve body are fixed together by fixing bolts.

[0010] Preferably, the distance between the outermost secondary sealing step of the multi-stage secondary sealing step and the through hole is 2-3 mm.

[0011] Preferably, the inner contour is adapted to the outer wheel of the valve core, and the inside of the through hole is provided with a reinforcing coating.

[0012] Preferably, the height reduction of the secondary sealing steps in the multi-stage design is 1-1.5 mm per stage.

[0013] The beneficial effects of this utility model are as follows: Multiple coaxially arranged multi-level sealing steps are provided on the valve core, forming a pyramid shape. The distance between the secondary sealing steps and the sidewall of the through hole decreases sequentially, forming a pressure-reducing chamber. This gradual pressure reduction through multiple secondary sealing steps of different heights reduces the load on single-point seals. When the mass flows through the secondary sealing steps, the kinetic and pressure energy alternately convert due to the repeated changes in the cross-sectional area of ​​the flow channel, causing the pressure to decrease gradually. The secondary sealing steps bear most of the differential pressure load, and then the metal hard sealing layer on the main sealing surface is used for sealing, protecting the main sealing surface from direct impact of high pressure, thus achieving a better sealing effect. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the valve core structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the through hole structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the installation of the valve cover of this utility model.

[0019] Explanation of reference numerals in the attached figures: 1. Valve body; 2. Inlet chamber; 3. Outlet chamber; 4. Valve cover; 5. Through hole; 6. Valve stem; 7. Valve core; 8. Mounting cavity; 9. First sealing step; 10. Second sealing step; 11. Sealing ring; 12. Secondary sealing step; 13. Primary sealing surface; 14. Metal hard sealing layer; 15. Pressure reducing cavity; 16. PTFE coating; 17. Reinforcing coating. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0021] like Figures 1-4 As shown, this embodiment provides a valve with multiple sealing functions, including a valve body 1 and a valve cover 4. The valve body 1 has an inlet chamber 2 and an outlet chamber 3, and a through hole 5 is provided on the valve wall between the inlet chamber 2 and the outlet chamber 3. The valve cover 4 has a linearly moving valve stem 6, and the inner end of the valve stem 6 has a valve core 7 for closing the through hole 5. The valve body 1 has a mounting cavity 8 for mounting the valve cover 4, and a first sealing step 9 is provided on the inner side wall of the mounting cavity 8. The valve cover 4 has a second sealing step 10 corresponding to the first sealing step. Multiple sealing rings 11 are installed between the first sealing step 9 and the second sealing step. This facilitates disassembly, thereby facilitating the maintenance of the valve core.

[0022] The valve core 7 is provided with multiple coaxially arranged multi-level sealing steps 12. The height difference of each step in the multiple layers of secondary sealing steps 12 decreases by 0.5-2mm. The end of the valve core is provided with a primary sealing surface 13, and a metal hard sealing layer 14 is provided on the primary sealing surface 13. The multiple secondary sealing steps 12 form a "pyramid" shape. The distance between the secondary sealing steps 12 and the side wall of the through hole 5 decreases sequentially to form a pressure reducing cavity 15. By providing multiple coaxially arranged multi-level sealing steps 12 on the valve core 7, the multi-level secondary sealing steps 12 form a "pyramid" shape. The distance between the secondary sealing steps 12 and the sidewall of the through hole 5 decreases sequentially to form a pressure-reducing chamber 15. In this way, the pressure is reduced step by step by multiple secondary sealing steps 12 of different heights, reducing the load on single-point sealing. When the mass flows through the secondary sealing steps 12, due to the repeated changes in the cross-sectional area of ​​the flow channel, kinetic energy and pressure energy are alternately converted, and the pressure decreases step by step. The secondary sealing steps 12 bear most of the pressure difference load, and then the metal hard sealing layer 14 on the main sealing surface 13 is used for sealing, protecting the main sealing surface from direct impact of high pressure, thereby achieving a better sealing effect.

[0023] The secondary sealing step 12 of the multi-stage system has 3-5 layers. Too many layers increase flow resistance, while too few layers result in insufficient pressure reduction. The surface of the secondary sealing step 12 is covered with a PTFE coating 16 to resist corrosion from strong acids (concentrated sulfuric acid / aqua regia), strong alkalis, and organic solvents, thereby extending the service life of chemical equipment.

[0024] The secondary sealing step 12 has a step angle of 50°-55° to guide the medium to change direction and consume kinetic energy. The width of the multi-stage secondary sealing steps 12 is narrower at the inside and wider at the outside, gradually increasing from the inside to the outside to distribute the pressure load. The narrow main sealing surface ensures high specific pressure, while the wide secondary sealing surface intercepts particulate matter.

[0025] The valve cover 4 is fixed to the valve body 1 by fixing bolts, which facilitates disassembly.

[0026] The distance between the outermost secondary sealing step of the multi-stage secondary sealing step 12 and the through hole 5 is 2-3 mm.

[0027] The inner contour of the through hole 5 is adapted to the outer ring of the valve core 7, and a reinforcing coating 17 is provided on the inside of the through hole. The surface hardness of the valve hole is increased to HV 800-1500 by the hard coating (such as hard chrome, nickel-based alloy or tungsten carbide), which reduces the erosion and wear of the hole wall by the fluid medium (especially containing particulate matter). The coating fills the micro defects of the substrate and reduces the surface roughness (Ra≤0.2μm), ensuring that the valve core and the hole wall are tightly fitted when the valve is closed. In acidic / alkaline media, the coating (such as chemical plating of Ni-P alloy) forms a passivation film, which blocks the corrosion of the base metal and extends the valve life by 3-5 times.

[0028] The height reduction of the secondary sealing steps 12 in the multi-stage design is 1-1.5mm per stage, which balances the pressure attenuation gradient and structural strength.

[0029] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0030] During operation, multiple coaxially arranged multi-level sealing steps 12 are provided on the valve core 7, forming a "pyramid" shape. The distance between the secondary sealing steps 12 and the sidewall of the through hole 5 decreases sequentially to form a pressure-reducing chamber 15. In this way, the pressure is gradually reduced by multiple secondary sealing steps 12 of different heights, reducing the load on single-point seals. When the mass flows through the secondary sealing steps 12, the kinetic energy and pressure energy are alternately converted due to the repeated changes in the cross-sectional area of ​​the flow channel, and the pressure gradually decreases. The secondary sealing steps 12 bear most of the pressure difference load, and then the metal hard sealing layer 14 on the main sealing surface 13 is used for sealing, protecting the main sealing surface from direct impact of high pressure, thus achieving a better sealing effect.

[0031] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A valve with multiple sealing functions, comprising a valve body (1) and a valve cover (4), wherein the valve body (1) is provided with an inlet chamber (2) and an outlet chamber (3), and a through hole (5) is provided on the valve wall between the inlet chamber (2) and the outlet chamber (3), and a valve stem (6) with linear motion is provided on the valve cover (4), wherein the inner end of the valve stem (6) is provided with a valve core (7) for closing the through hole (5), characterized in that: The valve body (1) is provided with an installation cavity (8) for installing the valve cover (4), and the inner side wall of the installation cavity (8) is provided with a first sealing step (9), and the valve cover (4) is provided with a second sealing step (10) corresponding to the first sealing step. Multiple sealing rings (11) are installed between the first sealing step (9) and the second sealing step. The valve core (7) is provided with multiple coaxially arranged multi-level sealing steps (12), and the step height difference in the multiple layers of the secondary sealing steps (12) decreases by 0.5-2mm at each level. The valve core is provided with a main sealing surface (13) at its end, and a metal hard sealing layer (14) is provided on the main sealing surface (13). The multi-level secondary sealing steps (12) form a "pyramid" shape, and the distance between the secondary sealing steps (12) and the sidewall of the through hole (5) decreases in sequence to form a pressure-reducing cavity (15).

2. A valve with multiple sealing functions according to claim 1, characterized in that: The number of layers of the secondary sealing step (12) is 3-5, and the surface of the secondary sealing step (12) is covered with a PTFE coating (16).

3. A valve with multiple sealing functions according to claim 1, characterized in that: The step angle of the secondary sealing step (12) is 50°-55°, and the width of the multi-level secondary sealing step (12) is narrower inside and wider outside.

4. A valve with multiple sealing functions according to claim 1, characterized in that: The valve cover (4) and the valve body (1) are fixed together by fixing bolts.

5. A valve with multiple sealing functions according to claim 1, characterized in that: The distance between the outermost secondary sealing step (12) and the through hole (5) is 2-3 mm.

6. A valve with multiple sealing functions according to claim 1, characterized in that: The inner contour of the through hole (5) is adapted to the outer wheel of the valve core (7), and the inside of the through hole is provided with a reinforcing coating (17).

7. A valve with multiple sealing functions according to claim 1, characterized in that: The height reduction of the secondary sealing steps (12) in the multi-stage process is 1-1.5 mm per stage.

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