Safety valve with double adjusting springs

Abstract

The utility model provides a safety valve with double adjusting springs, which relates to the technical field of valves and comprises a valve body, a valve seat and a valve cover, a valve clack, a recoil disc, a guide sleeve and a valve rod are arranged in the valve body, a spring seat is arranged on the surface of the valve rod, a main spring is sleeved on the surface of the valve rod, and an adjusting nut is fixedly mounted in the valve cover. Two groups of independent elastic adjusting assemblies of the main spring and the auxiliary spring are arranged, compression amount is adjusted through the first adjusting head and the second adjusting head respectively, opening pressure and reseating pressure of the safety valve can be independently set, and the flexibility of pressure control of the safety valve is remarkably improved through a double adjusting mechanism; the problems that a traditional spring safety valve is large in opening and closing pressure difference and inaccurate in control are solved, the stability and safety of system operation are improved, and the isolation sleeve is arranged between the main spring and the auxiliary spring, so that mutual interference between the main spring and the auxiliary spring in the working process is effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a double-adjusting spring safety valve. Background Technology

[0002] As a key component in industrial pipelines and equipment systems, the performance of valves directly affects the safe and stable operation of the system. Safety valves, as the core device for preventing system overpressure, must quickly open to relieve pressure when it exceeds a threshold and accurately reseat to seal after the pressure returns to normal.

[0003] In the existing technology, traditional spring-loaded safety valves generally adopt a single spring structure. However, a single spring can only adjust the opening pressure through preload, and the reseating pressure depends on the natural elasticity of the spring and cannot be set independently. This results in a fixed opening and closing pressure difference, which is difficult to meet the pressure control accuracy requirements under complex working conditions and needs to be improved. Utility Model Content

[0004] The purpose of this invention is to solve the problem of single pressure regulation in the existing technology, and to propose a dual-adjustment spring safety valve.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a double-adjustable spring safety valve, comprising a valve body, a valve seat, and a valve cover. The valve body contains a valve disc, a backwash plate, a guide sleeve, and a valve stem. A spring seat is provided on the surface of the valve stem, and a main spring is fitted onto the surface of the valve stem. An adjusting nut is fixedly installed inside the valve cover. An adjusting head one is fixedly installed at one end of the valve stem. A valve cover is fixedly installed on the surface of the valve cover. An isolation sleeve is fixedly installed inside the valve cover. A connecting plate is fixedly connected to the side of the spring seat, and a secondary spring is fixedly connected to the surface of the connecting plate. An adjusting screw is rotatably connected inside the valve cover, and an adjusting head two is fixedly installed at one end of the adjusting screw. A guide rod is fixedly installed inside the valve cover.

[0006] Preferably, the valve stem has threads on its surface, and the valve stem is threadedly connected to the adjusting nut.

[0007] Preferably, there are two sets of spring seats, which are located at the upper and lower ends of the valve stem, and the two ends of the main spring are fixedly connected to the inner side of the spring seats.

[0008] Preferably, the secondary spring is disposed outside the main spring, the isolation sleeve is located between the main spring and the secondary spring, and the connecting plate and the isolation sleeve are slidably connected.

[0009] Preferably, one end of the auxiliary spring is fixedly connected to the inner side of the valve cover, the adjusting screw is threadedly connected to the connecting plate, and the connecting plate is slidably connected to the guide rod.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. In this utility model, by setting two independent elastic adjustment components, a main spring and a secondary spring, and adjusting the compression amount by adjusting head one and adjusting head two respectively, the opening pressure and reseating pressure of the safety valve can be set independently. The dual adjustment mechanism significantly improves the flexibility of the safety valve pressure control, solves the problem of large opening and closing pressure difference and inaccurate control of traditional spring safety valves, and improves the stability and safety of system operation.

[0012] 2. In this utility model, by setting an isolation sleeve between the main spring and the auxiliary spring, mutual interference between the two during operation is effectively prevented. Attached Figure Description

[0013] Figure 1 A three-dimensional structural diagram of a double-adjusting spring safety valve is provided for this utility model;

[0014] Figure 2 A cross-sectional view of a dual-adjustment spring safety valve is provided for this utility model.

[0015] Legend: 1. Valve body; 2. Valve seat; 3. Valve cover; 4. Valve disc; 5. Backflush disc; 6. Guide sleeve; 7. Valve stem; 8. Spring seat; 9. Main spring; 10. Adjusting nut; 11. Adjusting head one; 12. Valve cover; 13. Isolation sleeve; 14. Connecting plate; 15. Secondary spring; 16. Adjusting screw; 17. Adjusting head two; 18. Guide rod. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0018] Example 1: As Figures 1-2As shown, this utility model provides a technical solution: a double-adjustable spring safety valve, including a valve body 1, a valve seat 2, and a valve cover 3. The valve body 1 has a valve disc 4, a backwash plate 5, a guide sleeve 6, and a valve stem 7 inside. A spring seat 8 is provided on the surface of the valve stem 7, and a main spring 9 is fitted onto the surface of the valve stem 7. An adjusting nut 10 is fixedly installed inside the valve cover 3. An adjusting head 11 is fixedly installed at one end of the valve stem 7. A valve cover 12 is fixedly installed on the surface of the valve cover 3. An isolation sleeve 13 is fixedly installed inside the valve cover 3. A connecting plate 14 is fixedly connected to the side of the spring seat 8, and a secondary spring 15 is fixedly connected to the surface of the connecting plate 14. An adjusting screw 16 is rotatably connected inside the valve cover 3 for adjustment. An adjusting head 17 is fixedly installed at one end of the screw 16. A guide rod 18 is fixedly installed inside the valve cover 3. The surface of the valve stem 7 is threaded, and the valve stem 7 is threadedly connected to the adjusting nut 10. There are two sets of spring seats 8, which are located at the upper and lower ends of the valve stem 7. The two ends of the main spring 9 are fixedly connected to the inner side of the spring seat 8. The auxiliary spring 15 is located outside the main spring 9. The isolation sleeve 13 is located between the main spring 9 and the auxiliary spring 15. The connecting plate 14 is slidably connected to the isolation sleeve 13. One end of the auxiliary spring 15 is fixedly connected to the inner side of the valve cover 3. The adjusting screw 16 is threadedly connected to the connecting plate 14, and the connecting plate 14 is slidably connected to the guide rod 18.

[0019] In this embodiment, as the system pressure gradually increases, the medium pressure acts on the valve disc 4. At this time, the valve disc 4 is subjected to the combined action of the downward preload of the main spring 9 and the upward thrust of the medium. By rotating the adjusting head 11, the valve stem 7 is driven to rotate. The threaded connection between the valve stem 7 and the adjusting nut 10 allows for precise adjustment of the compression of the main spring 9, thereby setting the opening pressure of the safety valve. When the medium pressure exceeds the set value, the valve disc 4 overcomes the force of the main spring 9 and moves upward to open. The backwash plate 5 generates an auxiliary opening force due to the impact of the medium, accelerating the opening process of the valve disc 4. After the safety valve opens and releases pressure, the system pressure drops. At this time, the valve disc 4 is driven by the rotating adjusting head 17... Rotating the adjusting screw 16 allows the threaded connection between the adjusting screw 16 and the connecting plate 14 to adjust the preload of the secondary spring 15. The change in the elastic force of the secondary spring 15, combined with the force of the main spring 9, controls the valve disc 4 to fall back. Since the secondary spring 15 is located outside the main spring 9 and separated by the isolation sleeve 13, the connecting plate 14 slides stably along the isolation sleeve 13 under the constraint of the guide rod 18, ensuring that the secondary spring 15 will not deviate when it extends or retracts, thereby accurately controlling the reseating pressure of the safety valve and realizing independent and precise adjustment of the opening pressure and the reseating pressure. At the same time, the two sets of spring seats 8 effectively fix the two ends of the main spring 9, disperse the force, and improve the working stability of the main spring 9.

[0020] The working principle of this embodiment is as follows: In use, the safety valve is first installed on the pressure vessel or pipeline system to be protected. The medium acts on the bottom of the valve disc 4 through the internal channel of the valve body 1. When the system pressure is lower than the set value, the main spring 9 applies pressure through the upper and lower spring seats 8, so that the valve disc 4 is tightly pressed against the valve seat 2 to maintain a sealed state. When the system pressure rises to the set opening pressure, the force of the medium overcomes the elasticity of the main spring 9 and pushes the valve disc 4 upward. The backwash plate 5, together with the guide sleeve 6, guides the valve disc 4 to open smoothly and release excess pressure. At this time, the compression of the main spring 9 can be adjusted by rotating the adjusting head 11, so as to accurately set the opening pressure. A secondary spring 15 is provided outside the main spring 9. One end of it is fixed to the inside of the valve cover 3, and the other end is connected to the adjusting screw 16 through the connecting plate 14 and can slide axially under the guidance of the guide rod 18. By rotating the adjusting head 17, the adjusting screw 16 is moved to change the initial compression state of the secondary spring 15, which is used to assist in adjusting the reseating pressure when the valve is closed. The isolation sleeve 13 is set between the main spring 9 and the secondary spring 15 to prevent them from interfering with each other.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A double-adjusting spring safety valve, comprising a valve body (1), a valve seat (2), and a valve cover (3), characterized in that: The valve body (1) is provided with a valve disc (4), a backflush disc (5), a guide sleeve (6) and a valve stem (7) inside. The valve stem (7) is provided with a spring seat (8) on its surface and a main spring (9) on its surface. An adjusting nut (10) is fixedly installed inside the valve cover (3). An adjusting head (11) is fixedly installed at one end of the valve stem (7). A valve cover (12) is fixedly installed on the surface of the valve cover (3). An isolation sleeve (13) is fixedly installed inside the valve cover (3). A connecting plate (14) is fixedly connected to the side of the spring seat (8). A secondary spring (15) is fixedly connected to the surface of the connecting plate (14). An adjusting screw (16) is rotatably connected inside the valve cover (3). An adjusting head (17) is fixedly installed at one end of the adjusting screw (16). A guide rod (18) is fixedly installed inside the valve cover (3).

2. The dual-adjusting spring safety valve according to claim 1, characterized in that: The valve stem (7) has threads on its surface, and the valve stem (7) is threadedly connected to the adjusting nut (10).

3. The dual-adjusting spring safety valve according to claim 1, characterized in that: There are two sets of spring seats (8). The spring seats (8) are located at the upper and lower ends of the valve stem (7). The two ends of the main spring (9) are fixedly connected to the inner side of the spring seats (8).

4. The dual-adjusting spring safety valve according to claim 1, characterized in that: The secondary spring (15) is disposed outside the main spring (9), the isolation sleeve (13) is located between the main spring (9) and the secondary spring (15), and the connecting plate (14) is slidably connected to the isolation sleeve (13).

5. The dual-adjusting spring safety valve according to claim 1, characterized in that: One end of the secondary spring (15) is fixedly connected to the inner side of the valve cover (3), the adjusting screw (16) is threadedly connected to the connecting plate (14), and the connecting plate (14) is slidably connected to the guide rod (18).

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