A soft-seal valve disc

Abstract

The utility model discloses a soft sealing valve clack, including the backflushing disc, the backflushing disc bottom is equipped with the locating groove, install the valve clack main part for with the valve seat when constitute sealed cooperation of resistance tight in the locating groove, the lower end surface of valve clack main part is provided with annular seal groove, the section of annular seal groove is the conical shape that big is down small, the first sealing ring is inlayed in the annular seal groove, and the first sealing ring lower end protrudes from valve clack main part lower end surface, is used for when the valve is closed with the valve seat cooperation. The utility model not only has the advantage that the sealing property is good when cooperating with the valve seat, and has the advantage that the structural stability is strong.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a soft-seal valve disc covering gate valves, check valves, and safety valves. Background Technology

[0002] A pilot-operated safety valve is a type of non-direct-load safety valve. It consists of a main valve and a pilot valve (also known as a "slave valve"). The main valve is driven by the medium discharged from the pilot valve. Because the pressure in the system is in pulse form, it is also called a "pulse-type safety valve." Individually, the pilot valve itself is also a type of direct-load safety valve. When the medium pressure reaches the opening pressure of the pilot valve, the pilot valve opens first, and the discharged medium enters the main valve through the bypass pipe.

[0003] Currently, existing pilot-operated safety valves typically include a valve body, valve seat, valve disc, spring, and valve cap. The valve disc is installed in the valve body and corresponds to the valve seat. The valve disc and valve seat usually use a conical metal hard seal (i.e., hard alloy seal). Because the conical metal hard seal between the valve disc and valve seat has a poor reverse sealing effect, especially when the medium is oil, when the pressure at the outlet of the safety valve is higher than the pressure at the inlet of the safety valve, the pressure medium will flow back to the inlet of the safety valve, affecting the safety of the pressure pipeline components or seriously affecting normal operating conditions.

[0004] To address the aforementioned issues, utility model patent application CN202121338045.1 discloses a double-sealed safety valve, comprising a valve seat, a valve disc, and a spring. A hard alloy seal is used between the valve seat and the valve disc. An annular groove is provided on the lower end face of the valve disc, and a sealing gasket is embedded within the annular groove, corresponding to the upper end face of the valve seat outlet. When the safety valve is closed, the valve disc is pressed against the valve seat by the spring, thereby pressing the sealing gasket tightly. The sealing gasket and the upper end face of the valve seat form an end-face seal. Simultaneously, a hard alloy seal is also used between the valve disc and the valve seat, achieving a double seal. However, this structure also has the following problems during use: the sealing gasket is not securely installed. Because the cross-section of the annular groove is rectangular, and the sealing gasket is usually directly pressed into the annular groove, the sealing gasket is easily subjected to water flow impact and frequent stress during use, causing the sealing gasket to loosen and fall out of the sealing groove, resulting in poor structural stability.

[0005] Therefore, it is necessary to improve the valve disc structure. Utility Model Content

[0006] The purpose of this invention is to provide a soft-seal valve disc, which not only has good sealing performance when matched with the valve seat, but also has the advantage of strong structural stability.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a soft-seal valve disc, including a backflush disc, the bottom of which is provided with a positioning groove, and a valve disc body for forming a sealing fit when it abuts against a valve seat is installed in the positioning groove; an annular sealing groove is provided on the lower end face of the valve disc body, the cross-section of which is tapered with a larger upper section and a smaller lower section, and a first sealing ring is embedded in the annular sealing groove, with the lower end of the first sealing ring protruding from the lower end face of the valve disc body, for cooperating with the valve seat when the valve is closed.

[0008] By adopting the above technical solution, the annular sealing groove at the lower end of the valve disc body is a conical shape with a larger upper part and a smaller lower part, that is, the opening width is smaller than the inner end width of the groove. The first sealing ring is embedded in the annular sealing groove and is not easy to come out of the annular sealing groove. It not only has good sealing performance when it is matched with the valve seat, but also has the advantage of strong structural stability. It is suitable for gate valves, check valves and safety valves.

[0009] The present invention is further configured such that the valve disc body includes a mounting plate and a pressure plate, the bottom of the mounting plate is provided with a mounting groove, the pressure plate is connected to the mounting groove, the bottom of the mounting plate is provided with a first annular flange protruding from the lower end face of the mounting plate, the inner circumference of the first annular flange is provided with a first conical surface, the bottom of the outer circular surface of the pressure plate is provided with a second annular flange, the outer circumference of the second annular flange is provided with a second conical surface, and the lower end of the mounting plate forms the annular sealing groove at the position between the first conical surface and the second conical surface.

[0010] By adopting the above technical solution, the second annular flange can move relative to the first annular flange. When the pressure plate and the mounting plate are engaged, the first sealing ring is clamped and fixed, which not only facilitates the installation of the first sealing ring, but also ensures good installation stability.

[0011] The present invention is further configured such that the valve disc body also includes a locking screw, a first circular hole is provided at the center of the pressure plate, a first screw hole coaxial with the first circular hole is provided at the lower end of the mounting plate, and the first screw hole does not penetrate the mounting plate, the screw portion of the locking screw passes through the first circular hole and is threadedly engaged with the first screw hole, and the screw head of the locking screw abuts against the lower end of the pressure plate.

[0012] By adopting the above technical solution, the mounting plate and the pressure plate are installed together by screw connection, which is very convenient for disassembly and assembly. Moreover, the first screw hole does not penetrate the mounting plate, reducing leakage points and lowering the probability of leakage.

[0013] The present invention is further provided that a washer is provided between the screw head of the locking screw and the pressure plate.

[0014] By adopting the above technical solution, when tightening the locking screw, the washer can apply an axial preload to the locking screw, increase the thread friction between the locking screw and the first threaded hole, thereby achieving the effect of loosening the locking screw.

[0015] The present invention is further configured such that an annular groove coaxial with the first screw hole is provided on the inner end face of the mounting plate corresponding to the mounting groove, and a second sealing ring for forming a sealing fit with the pressure plate is embedded in the annular groove.

[0016] By adopting the above technical solution, a vacuum cavity is formed between the first sealing ring and the second sealing ring, which prevents the first sealing ring from flying out under high pressure and further improves the firmness of the first sealing ring installation.

[0017] The present invention is further configured such that the valve disc body is connected to the recoil plate by a plurality of positioning screws, the valve disc body has a plurality of second through holes arranged in a circumferential array on its outer periphery, and the valve disc body has a plurality of second screw holes arranged in a circumferential array on its outer periphery, the positioning screws pass through the corresponding second through holes and are threadedly engaged with the corresponding second screw holes.

[0018] By adopting the above technical solution, the valve disc body and the backflush plate are connected by screws, which makes disassembly and assembly very convenient. Moreover, the positioning screws are distributed in a circumferential array on the same horizontal plane. Compared with the vertical connection method, the valve disc body is subjected to uniform force in all parts, resulting in better installation stability.

[0019] The present invention is further configured such that a pressure stabilizing hole communicating with the positioning groove is provided at the upper end of the backflush plate.

[0020] By adopting the above technical solution, the valve disc body can be installed more smoothly into the positioning groove of the recoil plate, making the installation of the valve disc body more convenient.

[0021] The present invention is further configured such that the upper center of the valve disc body is provided with a conical positioning protrusion that is smaller at the top and larger at the bottom, and the position of the backflush plate corresponding to the inner end of the positioning groove is provided with a conical positioning recess that matches the conical positioning protrusion.

[0022] By adopting the above technical solution, the valve disc body can be aligned during installation, ensuring it is installed at the exact center of the recoil plate, resulting in higher precision. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This utility model Figure 1 A magnified structural diagram of part A in the middle.

[0025] In the diagram: 1. Backflush plate; 2. Positioning groove; 3. Valve disc body; 4. Annular sealing groove; 5. First sealing ring; 6. Mounting plate; 7. Pressure plate; 8. Mounting groove; 9. First annular flange; 10. First conical surface; 11. Second annular flange; 12. Second conical surface; 13. Locking screw; 14. First round hole; 15. First screw hole; 16. Washer; 17. Annular groove; 18. Second sealing ring; 19. Positioning screw; 20. Second through hole; 21. Second screw hole; 22. Pressure stabilizing hole; 23. Conical positioning protrusion; 24. Conical positioning recess. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example: As attached Figure 1 and attached Figure 2 The diagram illustrates a soft-seal valve disc, comprising a backflush plate 1. The backflush plate 1 has a positioning groove 2 at its bottom, in which a valve disc body 3 is installed for a sealing fit when it abuts against a valve seat. The lower end face of the valve disc body 3 has an annular sealing groove 4. The annular sealing groove 4 has a tapered cross-section, wider at the top and narrower at the bottom. A first sealing ring 5 is embedded within the annular sealing groove 4. The width of the first sealing ring 5 is greater than the width of the lower opening of the annular sealing groove 4, and the lower end of the first sealing ring 5 protrudes from the lower end face of the valve disc body 3, for engagement with the valve seat when the valve is closed. The annular sealing groove 4 at the lower end of the valve disc body 3 has a tapered shape, meaning the opening width is smaller than the inner width of the groove. The first sealing ring 5 is embedded in the annular sealing groove 4 and is not easily dislodged. This design not only provides good sealing when engaged with the valve seat but also offers strong structural stability, making it suitable for gate valves, check valves, and safety valves.

[0028] As attached Figure 1 and attached Figure 2As shown, the valve disc body 3 includes a mounting plate 6 and a pressure plate 7. The mounting plate 6 has a mounting groove 8 at its bottom, and the pressure plate 7 is connected to the mounting groove 8. The mounting plate 6 has a first annular flange 9 protruding from its lower end face at its bottom. The first annular flange 9 and the mounting plate 6 are an integral structure. The inner circumference of the first annular flange 9 has a first conical surface 10. The bottom of the outer circular surface of the pressure plate 7 has a second annular flange 11, which is an integral structure with the pressure plate 7. The outer circumference of the second annular flange 11 has a second conical surface 12. The lower end of the mounting plate 6 is located between the first conical surface 10 and the second conical surface 12, forming the annular sealing groove 4, i.e., an annular sealing groove 4 that is larger at the top and smaller at the bottom. The second annular flange 11 can move relative to the first annular flange 9. When the pressure plate 7 and the mounting plate 6 are engaged, the first sealing ring 5 is clamped and fixed, which not only facilitates the installation of the first sealing ring 5 but also ensures good installation stability.

[0029] As attached Figure 1 As shown, the valve disc body 3 also includes a locking screw 13. A first circular hole 14 is formed at the center of the pressure plate 7. A first threaded hole 15, coaxial with the first circular hole 14, is formed at the lower end of the mounting plate 6. The first threaded hole 15 does not penetrate the mounting plate 6. The screw portion of the locking screw 13 passes through the first circular hole 14 and is threaded into the first threaded hole 15. The screw head of the locking screw 13 abuts against the lower end of the pressure plate 7. The mounting plate 6 and the pressure plate 7 are installed together by screws, making assembly and disassembly very convenient. Furthermore, the first threaded hole 15 does not penetrate the mounting plate 6, reducing leakage points and lowering the probability of leakage.

[0030] As attached Figure 1 As shown, a washer 16 is provided between the screw head of the locking screw 13 and the pressure plate 7. When the locking screw 13 is tightened, the washer can apply an axial preload to the locking screw 13, increasing the thread friction between the locking screw 13 and the first screw hole 15, thereby relaxing the locking screw 13.

[0031] As attached Figure 1 As shown, the mounting plate 6 has an annular groove 17 coaxial with the first screw hole 15 on the inner end face of the mounting groove 8. A second sealing ring 18 is embedded in the annular groove 17 to form a sealing fit with the pressure plate 7. A vacuum cavity is formed between the first sealing ring 5 and the second sealing ring 18 to prevent the first sealing ring 5 from flying out under high pressure, and to further improve the firmness of the installation of the first sealing ring 5.

[0032] As attached Figure 1As shown, the valve disc body 3 is connected to the recoil plate 1 by multiple positioning screws 19. The valve disc body 3 has multiple second through holes 20 arranged in a circumferential array on its outer periphery, and multiple second threaded holes 21 arranged in a circumferential array on its outer periphery. The positioning screws 19 pass through the corresponding second through holes 20 and are threaded into the corresponding second threaded holes 21. The valve disc body 3 and the recoil plate 1 are connected by screws, making assembly and disassembly very convenient. Furthermore, the positioning screws 19 are arranged in a circumferential array on the same horizontal plane, resulting in more even stress distribution across the valve disc body 3 compared to a vertical connection, leading to better installation stability.

[0033] As attached Figure 1 As shown, the upper end of the recoil plate 1 has a pressure stabilizing hole 22 that communicates with the positioning groove 2. This design allows the valve disc body 3 to be installed more smoothly into the positioning groove 2 of the recoil plate 1, making the installation of the valve disc body 3 more convenient.

[0034] As attached Figure 1 As shown, the upper center of the valve disc body 3 is provided with a tapered positioning protrusion 23 that is smaller at the top and larger at the bottom. The recoil plate 1 is provided with a tapered positioning recess 24 that matches the tapered positioning protrusion 23 at the inner end of the positioning groove 2. This design can center the valve disc body 3 during installation, keeping it installed at the exact center of the recoil plate 1, resulting in higher fitting accuracy.

Claims

1. A soft-seal valve disc, comprising a backflush disc (1), wherein the bottom of the backflush disc (1) is provided with a positioning groove (2), and a valve disc body (3) for forming a sealing fit when pressed against a valve seat is installed in the positioning groove (2); characterized in that: The lower end face of the valve disc body (3) is provided with an annular sealing groove (4). The cross-section of the annular sealing groove (4) is a cone shape with a larger upper part and a smaller lower part. A first sealing ring (5) is embedded in the annular sealing groove (4), and the lower end of the first sealing ring (5) protrudes from the lower end face of the valve disc body (3) for cooperating with the valve seat when the valve is closed.

2. The soft-seal valve disc according to claim 1, characterized in that: The valve disc body (3) includes a mounting plate (6) and a pressure plate (7). The mounting plate (6) has a mounting groove (8) at its bottom and the pressure plate (7) is connected to the mounting groove (8). The mounting plate (6) has a first annular flange (9) protruding from the lower end face of the mounting plate (6) at its bottom. The inner circumference of the first annular flange (9) has a first conical surface (10). The bottom of the outer circular surface of the pressure plate (7) has a second annular flange (11). The outer circumference of the second annular flange (11) has a second conical surface (12). The lower end of the mounting plate (6) is located between the first conical surface (10) and the second conical surface (12) to form the annular sealing groove (4).

3. A soft-sealing valve disc according to claim 2, characterized in that: The valve disc body (3) also includes a locking screw (13). A first circular hole (14) is provided at the center of the pressure plate (7). A first screw hole (15) is provided at the lower end of the mounting plate (6) and is coaxial with the first circular hole (14). The first screw hole (15) does not penetrate the mounting plate (6). The screw of the locking screw (13) passes through the first circular hole (14) and is threadedly engaged with the first screw hole (15). The screw head of the locking screw (13) abuts against the lower end of the pressure plate (7).

4. A soft-sealing valve disc according to claim 3, characterized in that: A washer (16) is provided between the screw head of the locking screw (13) and the pressure plate (7).

5. A soft-sealing valve disc according to claim 3, characterized in that: The mounting plate (6) has an annular groove (17) coaxial with the first screw hole (15) on the inner end face of the mounting groove (8). A second sealing ring (18) for forming a sealing fit with the pressure plate (7) is embedded in the annular groove (17).

6. A soft-sealing valve disc according to claim 2, characterized in that: The valve body (3) is connected to the backflush plate (1) by a plurality of positioning screws (19). The valve body (3) has a plurality of second through holes (20) arranged in a circumferential array on its outer periphery. The valve body (3) has a plurality of second screw holes (21) arranged in a circumferential array on its outer periphery. The positioning screws (19) pass through the corresponding second through holes (20) and are threaded into the corresponding second screw holes (21).

7. A soft-sealing valve disc according to claim 6, characterized in that: The upper end of the backflush plate (1) is provided with a pressure stabilizing hole (22) that is connected to the positioning groove (2).

8. A soft-seal valve disc according to claim 6, characterized in that: The valve body (3) has a conical positioning protrusion (23) at the center of its upper end, which is smaller at the top and larger at the bottom. The backflush plate (1) has a conical positioning recess (24) at the position of the inner end of the positioning groove (2) that is adapted to the conical positioning protrusion (23).

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