Sealing safety valve

Abstract

The utility model discloses a sealing safety valve, and belongs to the technical field of safety valves. A sealing safety valve comprises a valve body, a valve seat, a valve clack, a recoil disc, a valve rod, a guide sleeve, a valve deck, a spring and a leakage-proof assembly. Through the arrangement of the leakage-proof assembly, the movable disc is driven by the elastic force of the spring to compress the sealing ring upwards, so that the sealing ring can abut against the recoil disc to form sealing, and the sealing performance of the device is guaranteed; the elastic force of the spring can ensure that the sealing ring is always in an inward deformation state, so that the sealing ring can always abut against the recoil disc, and the sealing performance is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of safety valves, and more specifically, relates to a sealed safety valve. Background Art

[0002] A safety valve is in a normally closed state under the action of external force on the opening and closing member. When the medium pressure in the equipment or pipeline rises above the specified value, it is a special valve that prevents the medium pressure in the pipeline or equipment from exceeding the specified value by discharging the medium to the outside of the system;

[0003] During the operation of the safety valve, the closing and opening of the valve seat and the valve flap are driven by the medium pressure for circulation. During use, the valve flap moves in the guide sleeve by pushing the backflush disc, so the sealing between the backflush disc and the guide sleeve is an important part of the leak-proof seal of the safety valve. The seal between the traditional guide sleeve and the backflush disc is realized by installing a sealing ring. However, during actual use, the sealing ring is deformed after repeated wear, and the sealing ring cannot abut against the backflush disc, resulting in leakage. Therefore, a spring leak-proof safety valve is proposed; therefore, a sealed safety valve is proposed. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a sealed safety valve, which can achieve the purpose of improving the sealing performance of the safety valve.

[0005] A sealed safety valve of the utility model includes a valve body, a valve seat, a valve flap, a backflush disc, a valve rod, a guide sleeve, a valve cover, a spring and a leak-proof component;

[0006] The valve seat is fixedly installed at the lower end inside the valve body, the valve cover is fixedly installed at the upper end of the valve body, the valve flap is installed at the lower end of the backflush disc, and the lower end face of the valve flap is in mating contact with the end face of the valve seat; the guide sleeve is fixedly installed at the upper end of the valve body, the backflush disc is movably installed inside the guide sleeve, the upper end of the valve rod is connected to the valve cover, a connection head is arranged at the lower end of the valve rod, the connection head is connected to the backflush disc, a top plate is arranged at the upper end of the valve rod, the spring is sleeved on the valve rod, and both ends of the spring are respectively abutted against the top plate and the connection head; the leak-proof component is fixedly installed at the lower end of the guide sleeve, and the output end of the leak-proof component abuts against the outer wall of the backflush disc to achieve sealing.

[0007] As a further improvement of the utility model, the leak-proof component includes a fixed disc, a movable disc, a spring and a sealing ring; the fixed disc is fixedly connected to the lower end face of the guide sleeve; the movable disc is movably installed on the fixed disc, both ends of the spring are respectively fixedly connected to the upper end face of the fixed disc and the lower end face of the movable disc, the upper and lower ends of the sealing ring are respectively fixedly connected to the lower end face of the guide sleeve and the upper end face of the movable disc, and the sealing ring abuts against the outer wall of the backflush disc.

[0008] As a further improvement of the utility model, the middle part of the sealing ring bulges inward in the natural state.

[0009] As a further improvement of the present utility model, a guide rod is provided on the lower end face of the guide sleeve. The lower end of the guide rod is fixedly connected to the fixed disk, and the movable disk movably penetrates through the guide rod.

[0010] As a further improvement of the present utility model, the number of the guide rods is at least 4, and they are uniformly arranged along the circumferential direction on the lower end face of the guide sleeve.

[0011] As a further improvement of the present utility model, limit posts are provided on both the lower end face of the movable disk and the upper end face of the fixed disk, and the spring is sleeved on the limit posts.

[0012] Compared with the prior art, the advantages of the present utility model are as follows:

[0013] By setting the anti-leakage component, the elastic force of the spring drives the movable disk to compress the sealing ring upward, so that the sealing ring can abut against the backwash disk to form a seal, ensuring the sealing performance of the device; the elastic force of the spring can ensure that the sealing ring is always in a state of inward deformation, so as to ensure that the sealing ring can always abut against the backwash disk and ensure the sealing performance. Description of the Drawings

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is the structural schematic diagram at the backwash disk of the present utility model;

[0016] Figure 3 is the sectional structural schematic diagram at the anti-leakage component of the present utility model.

[0017] Explanation of the reference numerals in the drawings:

[0018] 1. Valve body; 2. Valve seat; 3. Valve flap; 4. Backwash disk; 5. Valve stem; 6. Guide sleeve; 7. Valve cover; 9. Anti-leakage component; 901. Fixed disk; 902. Movable disk; 903. Sealing ring; 904. Guide rod; 905. Limit post. Detailed Embodiment

[0019] Specific Embodiment 1: Please refer to Figures 1-3 a kind of sealed safety valve, including a valve body 1, a valve seat 2, a valve flap 3, a backwash disk 4, a valve stem 5, a guide sleeve 6, a valve cover 7, a spring and an anti-leakage component 9;

[0020] The valve seat 2 is fixedly installed at the lower end inside the valve body 1, the valve cover 7 is fixedly installed at the upper end of the valve body 1, the valve flap 3 is installed at the lower end of the backwash disc 4, and the lower end face of the valve flap 3 abuts against the end face of the valve seat 2; the guide sleeve 6 is fixedly installed at the upper end of the valve body 1, the backwash disc 4 is movably installed inside the guide sleeve 6, the upper end of the valve stem 5 is connected to the valve cover 7, a connection head is arranged at the lower end of the valve stem 5, the connection head is connected to the backwash disc 4, a top plate is arranged at the upper end of the valve stem 5, the spring is sleeved on the valve stem 5, and both ends of the spring abut against the top plate and the connection head respectively;

[0021] The leak-proof component 9 includes a fixed disc 901, a movable disc 902, a spring and a sealing ring 903; a guide rod 904 is arranged on the lower end face of the guide sleeve 6, and the lower end of the guide rod 904 is fixedly connected to the fixed disc 901; the movable disc 902 is movably installed on the fixed disc 901; the movable disc 902 movably penetrates through the guide rod 904, and the guide rod 904 can play a guiding role in the movement of the movable disc 902, both ends of the spring are fixedly connected to the upper end face of the fixed disc 901 and the lower end face of the movable disc 902 respectively; at the same time, limiting posts 905 are arranged on both the lower end face of the movable disc 902 and the upper end face of the fixed disc 901, the spring is sleeved on the limiting posts 905, and the limiting posts 905 can limit the spring to prevent the spring from shifting during use. The upper and lower ends of the sealing ring 903 are fixedly connected to the lower end face of the guide sleeve 6 and the upper end face of the movable disc 902 respectively, and the sealing ring 903 abuts against the outer wall of the backwash disc 4; at the same time, the middle part of the sealing ring 903 bulges inwards in the natural state, so as to play a guiding role in inward deformation when the sealing ring 903 is compressed, ensuring that the sealing ring 903 can stably fit with the backwash disc 4 for sealing.

[0022] Working principle: In the present utility model, the elastic force of the spring drives the movable disc 902 to compress the sealing ring 903 upwards, so that the sealing ring 903 can abut against the backwash disc 4 to form a seal, ensuring the sealing performance of the device; the elastic force of the spring can ensure that the sealing ring 903 is always in a state of inward deformation, so as to ensure that the sealing ring 903 can always abut against the backwash disc 4 and ensure the sealing performance.

[0023] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.

Claims

1. A sealed safety valve, characterized in that: It includes a valve body (1), a valve seat (2), a valve disc (3), a backwash disc (4), a valve stem (5), a guide sleeve (6), a valve cover (7), a spring and a leak-proof assembly (9); The valve seat (2) is fixedly installed at the lower end inside the valve body (1), the valve cover (7) is fixedly installed at the upper end of the valve body (1), the valve disc (3) is installed at the lower end of the backwash disc (4), and the lower end face of the valve disc (3) is in contact and abutted against the end face of the valve seat (2); the guide sleeve (6) is fixedly installed at the upper end of the valve body (1), the backwash disc (4) is movably installed inside the guide sleeve (6), the upper end of the valve stem (5) is connected to the valve cover (7), a connector is provided at the lower end of the valve stem (5), the connector is connected to the backwash disc (4), a top plate is provided at the upper end of the valve stem (5), the spring is sleeved on the valve stem (5), and the two ends of the spring are respectively in contact and abutted against the top plate and the connector; the leak-proof assembly (9) is fixedly installed at the lower end of the guide sleeve (6), and the output end of the leak-proof assembly (9) is in contact and abutted against the outer wall of the backwash disc (4) to achieve sealing; the leak-proof assembly (9) includes a fixed disc (901), a movable disc (902), a spring and a sealing ring (903); the fixed disc (901) is fixedly connected to the lower end face of the guide sleeve (6); the movable disc (902) is movably installed on the fixed disc (901), the two ends of the spring are respectively fixedly connected to the upper end face of the fixed disc (901) and the lower end face of the movable disc (902), the upper and lower ends of the sealing ring (903) are respectively fixedly connected to the lower end face of the guide sleeve (6) and the upper end face of the movable disc (902), and the sealing ring (903) is in contact and abutted against the outer wall of the backwash disc (4); limiting posts (905) are provided on both the lower end face of the movable disc (902) and the upper end face of the fixed disc (901), and the spring is sleeved on the limiting posts (905).

2. The sealed safety valve according to claim 1, characterized in that: The middle part of the sealing ring (903) bulges inward in the natural state.

3. A sealed safety valve according to claim 1, characterized in that: A guide rod (904) is provided on the lower end face of the guide sleeve (6), the lower end of the guide rod (904) is fixedly connected to the fixed disc (901), and the movable disc (902) movably penetrates through the guide rod (904).

4. A sealed safety valve according to claim 3, characterized in that: The number of the guide rods (904) is at least four (4), and they are evenly arranged along the circumferential direction on the lower end face of the guide sleeve (6).

Images