A safety valve with both automatic and manual pressure relief

Abstract

The present invention relates to a safety valve with both automatic and manual pressure relief, comprising a spring-loaded valve mechanism and a manual operating mechanism. The spring-loaded valve mechanism includes a valve seat connected to a pressure vessel, a valve stem disposed on the valve seat, a sealing structure formed between the lower end of the valve stem and the exhaust hole of the valve seat, a spring seat and a spring passing through the valve stem, and the spring-loaded valve mechanism automatically activates to provide overpressure protection when pressure exceeds a set pressure relief value. The manual operating mechanism includes a connecting rod structure connected to the valve stem, and the manual operating mechanism can drive the valve stem to move via the connecting rod structure to provide manual pressure relief. The present invention has both automatic protection against overpressure within the container to which the safety valve is connected and manual pressure relief, thereby improving the safety of container operation testing, inspection and maintenance, and lid opening operations.

Description

Technical Field

[0001] The invention belongs to the design technology of pressure relief valves, and in particular relates to a safety valve capable of both automatic and manual pressure relief. Background Art

[0002] Pressure vessels are devices that hold liquids or gases under pressure. To ensure safety, some pressure vessels are equipped with a safety valve, which releases pressure from the vessel. The valve automatically releases pressure when the pressure exceeds a set value.

[0003] When the pressure vessel is operating normally, its internal pressure has not reached the set pressure relief value. When the pressure vessel needs to be inspected, repaired, or opened, the safety valve can be manually operated to relieve pressure, so that the pressure inside the pressure vessel is balanced with the external pressure, ensuring operational safety.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a safety valve with both automatic and manual pressure relief to ensure the safety of the operation and handling of pressure vessels.

[0006] The technical solution of the present invention is as follows: a safety valve with both automatic and manual pressure relief, comprising a spring-loaded valve mechanism and a manual operating mechanism, the spring-loaded valve mechanism comprising a valve seat connected to a pressure vessel, the valve seat being provided with a valve stem, a sealing structure being formed between the lower end of the valve stem and the exhaust hole of the valve seat, the valve stem being provided with a spring seat and a spring, the spring-loaded valve mechanism automatically jumps when the pressure exceeds a set pressure relief value to achieve overpressure protection; the manual operating mechanism comprising a connecting rod structure connected to the valve stem, the manual operating mechanism being able to drive the valve stem to move through the connecting rod structure to achieve manual pressure relief.

[0007] Furthermore, in the safety valve with both automatic and manual pressure relief as described above, a valve stem sealing surface is provided at the lower end of the valve stem of the spring-loaded valve mechanism, and the valve stem sealing surface cooperates with the valve seat sealing surface on the valve seat exhaust hole to form a sealing structure, and the upper part of the valve stem sealing surface is a boss, and a boss exhaust groove is provided on the boss, and an exhaust groove is also provided along the axial direction of the valve stem surface.

[0008] Furthermore, in the safety valve with both automatic and manual pressure relief as described above, the spring seat of the spring-loaded valve mechanism is arranged in the valve seat, and the spring seat and the valve seat are connected by a thread. The spring seat is located at the upper end of the spring to compress the spring, and the other end of the spring is supported on the boss of the valve stem.

[0009] Furthermore, in the safety valve with both automatic and manual pressure relief as described above, the valve seat sealing surface has a wear-resistant surfacing layer, and the thickness of the wear-resistant surfacing layer is greater than or equal to 3 mm.

[0010] Furthermore, in the safety valve with both automatic and manual pressure relief as described above, the spring-loaded valve mechanism can be matched with the pressure relief value requirements of different pressure vessels by selecting the spring model or adjusting the spring seat height.

[0011] Furthermore, the safety valve with both automatic and manual pressure relief as described above, wherein the manual operating mechanism includes a support ring fixed on the upper part of the valve seat, the valve stem passes through the middle of the support ring, and a lower connecting rod seat is provided at the upper end of the support ring; the connecting rod structure includes a lower connecting rod and an upper connecting rod, the lower connecting rod is "V"-shaped, and is installed on the lower connecting rod seat through a pin shaft, one end of the lower connecting rod is connected to the lower end of the upper connecting rod by a pin shaft, and the other end of the lower connecting rod can drive the valve stem to move upward, the upper end of the upper connecting rod is connected to the upper connecting rod seat by a pin shaft, and the upper connecting rod seat is connected to the operating panel.

[0012] Furthermore, there are two sets of connecting rod structures, which are symmetrically arranged on both sides of the valve stem.

[0013] Furthermore, the safety valve with both automatic and manual pressure relief as described above, wherein the valve stem is provided with an adjusting nut, the adjusting nut is connected to the valve stem through a thread, the tightening nut is installed above the adjusting nut, one end of the lower connecting rod is in contact with the lower surface of the adjusting nut, when the upper connecting rod and the lower connecting rod are driven to move by the operating panel, one end of the lower connecting rod pries the adjusting nut, and the adjusting nut drives the valve stem to move upward, thereby realizing manual pressure relief.

[0014] Furthermore, the safety valve with both automatic and manual pressure relief as described above, wherein the upper part of the valve stem passes through the middle circular hole of the operating disk, a sliding groove is provided in the middle circular hole of the operating disk, a key groove is provided on the valve stem, a key is installed between the sliding groove and the key groove, which can make the operating disk move up and down and limit rotation at the same time, and a retaining ring is installed on the top of the valve stem to prevent the operating disk from detaching.

[0015] Furthermore, in the safety valve with both automatic and manual pressure relief as described above, the set pressure relief value is fine-tuned by adjusting the position of the adjusting nut.

[0016] The beneficial effects of the present invention are as follows: the safety valve with both automatic and manual pressure relief provided by the present invention integrates automatic pressure relief and manual pressure relief, which can realize the overpressure protection function of the pressure vessel and the manual pressure relief function of the pressure vessel, thereby improving the safety of the operation and maintenance of the pressure vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a safety valve in a closed state with both automatic and manual pressure relief according to the present invention;

[0018] Figure 2This is a structural diagram of the safety valve of the present invention in a tripping state;

[0019] Figure 3 Schematic diagram of the structure of the valve stem in an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the structure of the operating panel and the upper connecting rod seat in an embodiment of the present invention.

[0021] In the figure: 1. Manual operating mechanism; 2. Spring-loaded valve mechanism; 3. Valve stem; 4. Retaining ring; 5. Pin; 6. Operating panel; 7. Upper connecting rod seat; 8. Upper connecting rod; 9. Lower connecting rod; 10. Lower connecting rod seat; 11. Compression nut; 12. Adjusting nut; 13. Support ring; 14. Spring seat; 15. Spring; 16. Valve seat; 17. Valve seat sealing surface; 18. Pin hole; 19. Keyway; 20. Thread; 21. Exhaust groove; 22. Boss; 23. Boss exhaust groove; 24. Valve stem sealing surface; 25. Sliding groove. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] like Figure 1 As shown, the present invention provides a safety valve with both automatic and manual pressure relief, comprising a spring-loaded valve mechanism 2 and a manual operating mechanism 1. The spring-loaded valve mechanism 2 automatically trips when pressure exceeds a set pressure relief value to provide overpressure protection, while the manual operating mechanism 1 performs manual pressure relief.

[0024] like Figure 2 As shown, the spring-loaded valve mechanism includes a valve seat 16, a spring seat 14, a spring 15, and a valve stem 3. The valve seat 16 is installed on the pressure vessel, and the connection method with the pressure vessel can be welding, flange connection, sealing thread connection, or slot connection. The spring seat 14 is set in the valve seat 16, and the valve stem 3 passes through the spring seat 14 and the spring 15. The spring seat 14 is located at the upper end of the spring 15. The spring seat 14 is provided with an external thread, which cooperates with the internal thread of the valve seat 16 to press the spring 15. Figure 3 As shown, the valve stem 3 is an integrally machined part. The lower end of the valve stem 3 is provided with a valve stem sealing surface 24. The valve stem sealing surface 24 cooperates with the valve seat sealing surface 17 on the valve seat exhaust hole to form a sealing structure. The upper portion of the valve stem sealing surface 24 is a boss 22, and the boss 22 is provided with a plurality of boss exhaust grooves 23. The valve stem boss exhaust grooves 23 are evenly distributed on the valve stem boss 22. Exhaust grooves 21 are also provided along the axial surface of the valve stem 3. The lower end of the spring 15 acts on the valve stem boss 22.

[0025] When the safety valve is closed, the valve stem sealing surface 24 is in close contact with the valve seat sealing surface 17 on the valve seat exhaust hole to achieve sealing; when the pressure vessel exceeds the set pressure, the valve stem 3 moves upward under the pressure, the spring 15 is compressed, the safety valve is in the open state, and the valve stem sealing surface 24 leaves the valve seat sealing surface 17. At this time, the medium in the pressure vessel is discharged to the outside through the valve stem boss exhaust groove 23 and the valve stem exhaust groove 21.

[0026] As a preferred solution, the valve seat sealing surface 17 may have a wear-resistant surfacing layer, the thickness of the wear-resistant surfacing layer is greater than or equal to 3 mm, and the wear-resistant surfacing material is not limited to cobalt-based alloys and nickel-based alloys.

[0027] By changing the model of the spring 15 or adjusting the height of the spring seat 14 , the spring-loaded valve mechanism can be adapted to the requirements of pressure relief values ​​of different pressure vessels.

[0028] like Figure 2 As shown, the manual operating mechanism 1 includes a retaining ring 4, a pin 5, an operating disk 6, an upper connecting rod seat 7, an upper connecting rod 8, a lower connecting rod 9, a lower connecting rod seat 10, a clamping nut 11, an adjusting nut 12 and a support ring 13.

[0029] The support ring 13 is provided with an internal thread, which is assembled with the external thread on the upper end of the valve seat 16. A circular hole is provided in the middle of the support ring 13 to allow the valve stem 3 to pass through. The lower connecting rod seat 10 can be integrally processed with the support ring 13 or the two can be welded and fixed. The lower connecting rod 9 is installed on the lower connecting rod seat 10 through a pin. The lower connecting rod 9 is "V"-shaped, with two groups in total, and is symmetrically arranged with respect to the valve stem. In this embodiment, the two sides of the lower connecting rod 9 are of different lengths. Its long side is connected to the upper connecting rod 8 through a pin, and its short side is in contact with the lower surface of the adjusting nut 12. The adjusting nut 12 is installed on the thread 20 of the valve stem 3, and the clamping nut 11 is installed above the adjusting nut 12 to form a locking effect. The other end of the upper connecting rod 8 is connected to the upper connecting rod seat 7 through a pin. There are two upper connecting rods in total, which are symmetrically arranged with respect to the valve stem. The operating disk 6 and the upper connecting rod seat 7 can be processed as a whole or the two can be welded and fixed. A circular hole is provided in the middle of the operating disk 6 so that the valve stem 3 can pass through. A sliding groove 25 is provided inside the circular hole. Figure 4 The retaining ring 4 is mounted on the top of the valve stem 3 through the pin 5 , and the pin 5 passes through the pin hole 18 at the top of the valve stem to prevent the operating disk 6 from being separated from the valve stem 3 .

[0030] A key is installed between the sliding groove 25 on the operating disk 6 and the valve stem key groove 19, which allows the operating disk 6 and the upper connecting rod seat 7 to move up and down while limiting rotation.

[0031] By pressing the operating disk 6 downward, the force is transmitted to the upper connecting rod 8 and the lower connecting rod 9 in turn. The lower connecting rod "prizes" the adjusting nut 12 with its short side according to the "lever principle", and the adjusting nut 12 drives the valve stem 3 to move upward, thereby realizing the manual operation pressure relief function.

[0032] The adjusting nut 12 also has the function of fine-tuning the set pressure relief value. The principle is that when the lower connecting rod is at different angles, the force exerted by gravity on the adjusting nut will be different due to the supporting effect of the lower connecting rod.

[0033] When the pressure inside the safety valve exceeds the set pressure relief value, the safety valve automatically opens to relieve pressure. After the internal pressure is lowered below the set pressure by pressure relief, the safety valve automatically closes to achieve overpressure protection inside the safety valve. When the pressure inside the safety valve does not reach the set pressure relief value but the container connected to the safety valve needs to be opened, the operating panel of the safety valve can be manually operated to actively relieve the pressure of the safety valve to reduce the internal pressure of the container to the same level as the external pressure.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A safety valve with both automatic and manual pressure relief, characterized in that: The invention comprises a spring-loaded valve mechanism (2) and a manual operating mechanism (1), wherein the spring-loaded valve mechanism (2) comprises a valve seat (16) connected to a pressure vessel, a valve stem (3) is provided on the valve seat (16), a sealing structure is formed between the lower end of the valve stem and the exhaust hole of the valve seat, a spring seat (14) and a spring (15) are passed through the valve stem (3), and the spring-loaded valve mechanism (2) automatically jumps to realize overpressure protection when the pressure exceeds the set pressure relief value; the manual operating mechanism (1 ... valve stem (3) is provided on the valve stem (3), a spring seat (14) and a spring (15) are provided on the valve stem (3), and the spring-loaded valve mechanism (2) automatically jumps to realize overpressure protection when the pressure exceeds the set pressure relief value; the manual operating mechanism (1) comprises a valve seat (16) connected to a pressure vessel, a valve stem (3) is provided on the valve seat (16), a valve stem (3) is provided on the valve seat (16), a valve stem (3) is provided on the valve stem (3), a valve stem (3) is provided The invention relates to a connecting rod structure connected to the valve stem (3), wherein the connecting rod structure has two sets, which are symmetrically arranged on both sides of the valve stem. The manual operating mechanism (1) can drive the valve stem (3) to move through the connecting rod structure to achieve manual pressure relief. The manual operating mechanism includes a support ring (13) fixed on the upper part of the valve seat (16), the valve stem (3) passes through the middle of the support ring (13), and the upper end of the support ring (13) is provided with a lower connecting rod seat (10); the connecting rod structure includes a lower connecting rod (9) and an upper connecting rod (8 ), the lower connecting rod (9) is in a "V" shape and is installed on the lower connecting rod seat (10) through a pin shaft. One end of the lower connecting rod (9) is connected to the lower end of the upper connecting rod (8) through a pin shaft. The other end of the lower connecting rod (9) can drive the valve stem (3) to move upward. The upper end of the upper connecting rod (8) is connected to the upper connecting rod seat (7) through a pin shaft. The upper connecting rod seat (7) is connected to the operating panel (6); an adjusting nut (12) is provided on the valve stem (3), and the adjusting nut (12) is screwed to the valve stem (3). The valve stem (3) is connected with the valve stem (3), the pressing nut (11) is installed above the adjusting nut (12), one end of the lower connecting rod (9) contacts the lower surface of the adjusting nut (12), and when the upper connecting rod (8) and the lower connecting rod (9) are driven to move by the operating panel (6), one end of the lower connecting rod (9) pries the adjusting nut (12), and the adjusting nut (12) drives the valve stem (3) to move upward, thereby realizing manual pressure relief. The set pressure relief value is fine-tuned by adjusting the position of the adjusting nut (12).

2. The safety valve with both automatic and manual pressure relief according to claim 1, characterized in that: The lower end of the valve stem (3) is provided with a valve stem sealing surface (24), and the valve stem sealing surface (24) cooperates with the valve seat sealing surface (17) on the valve seat exhaust hole to form a sealing structure. The upper part of the valve stem sealing surface (24) is a boss (22), and the boss (22) is provided with a boss exhaust groove (23), and an exhaust groove (21) is also provided along the axial direction of the valve stem surface.

3. The safety valve with both automatic and manual pressure relief according to claim 2, characterized in that: The spring seat (14) of the spring-loaded valve mechanism is arranged in the valve seat (16), and the spring seat (14) and the valve seat (16) are connected by a thread. The spring seat (14) is located at the upper end of the spring (15) to compress the spring (15), and the other end of the spring (15) is supported on the boss (22) of the valve stem (3).

4. The safety valve with both automatic and manual pressure relief according to claim 2, characterized in that: The valve seat sealing surface (17) has a wear-resistant surfacing layer, and the thickness of the wear-resistant surfacing layer is greater than or equal to 3 mm.

5. The safety valve with both automatic and manual pressure relief according to claim 3, characterized in that: By selecting the model of the spring (15) or adjusting the height of the spring seat (14), the spring-loaded valve mechanism (2) can be matched with the requirements of pressure relief values ​​of different pressure vessels.

6. The safety valve with both automatic and manual pressure relief according to claim 1, characterized in that: The upper portion of the valve stem (3) passes through the central circular hole of the operating disk (6), a sliding groove (25) is provided in the central circular hole of the operating disk (6), a key groove (19) is provided on the valve stem (3), a key is installed between the sliding groove (25) and the key groove (19), so that the operating disk (6) can move up and down while limiting rotation, and a retaining ring is installed at the top of the valve stem (3) to prevent the operating disk (6) from detaching.

Images