Novel pilot operated safety valve

Abstract

The utility model relates to the technical field of pilot operated safety valves, in particular to a novel pilot operated safety valve which comprises a main valve body, a valve cover is arranged at the upper end of the main valve body, a first protective cover is arranged at the upper end of the valve cover, and a first opening and closing mechanism is arranged among the first protective cover, the valve cover and the main valve body. A first guide valve body is arranged outside the right side of the main valve body, and a second guide valve body is arranged at the upper end of the first guide valve body. When the valve works, fluid enters from the inlet and then is input into the first guide valve body and the second guide valve body through the guide pipe, at the moment, the fluid jacks the second piston and compresses the second spring, the fluid enters the valve cover through the air inlet pipe and presses the first piston, the first piston linearly descends and then drives the second valve rod and the first valve rod to synchronously descend, and the first valve rod compresses the first spring. The second valve rod drives the valve clack to descend, so that a passage between the inlet and the outlet is opened, pressure is released quickly, and due to the fact that the valve clack is opened downwards, sealing performance can be improved, and leakage is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of pilot-operated safety valves, and specifically relates to a new type of pilot-operated safety valve. Background Art

[0002] A pilot-operated safety valve is a safety device used to protect pressure vessels and pipeline systems, mainly used to prevent the pressure in the system from exceeding the set safety value. Its working principle is to control the opening and closing of the main valve through a pilot valve, so as to achieve more precise pressure regulation and protection.

[0003] Currently, when the existing pilot-operated safety valves are in use, their adaptability is insufficient. For example, many existing pilot-operated safety valves have poor adaptability to large-diameter fluids in design, resulting in reduced efficiency in large-diameter applications. Content of the Utility Model

[0004] The purpose of the utility model is to provide a new type of pilot-operated safety valve to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A new type of pilot-operated safety valve, comprising

[0007] A main valve body, a valve cover is arranged at the upper end of the main valve body, a first protective cover is arranged at the upper end of the valve cover, and a first opening and closing mechanism is arranged between the first protective cover, the valve cover and the main valve body;

[0008] A first pilot valve body is arranged outside the right side of the main valve body, a second pilot valve body is arranged at the upper end of the first pilot valve body, a second protective cover is arranged at the upper end of the second pilot valve body, and a second opening and closing mechanism is arranged between the second pilot valve body, the first pilot valve body and the second protective cover.

[0009] Preferably, an inlet is further arranged below the main valve body, an outlet is arranged on the left side of the main valve body, and one end of the main valve body far from the outlet is connected to the lower end of the first pilot valve body through a guiding pipe;

[0010] Preferably, the first opening and closing mechanism includes a second valve rod, the second valve rod is movably installed in the middle inside the main valve body, a valve disc is arranged at the bottom end of the second valve rod at the upper end inside the inlet, and a first valve rod is movably installed inside the first protective cover through a first spring;

[0011] Preferably, the first opening and closing mechanism further includes a first piston, the first piston is movably installed between the inside of the main valve body and the valve cover, the bottom end of the first valve rod penetrates through the valve cover and is fixedly connected to the first piston, and the top end of the second valve rod penetrates through the main valve body and is fixedly connected to the first piston;

[0012] Preferably, the opening and closing mechanism 2 includes a piston 2, the piston 2 is movably installed between the inside of the pilot valve body 2 and the pilot valve body 1, a valve stem 3 is arranged at the top end of the piston 2, the top end of the valve stem 3 passes through the protective cover 2 and is located inside the protective cover 2, a spring 2 connected to the valve stem 3 is arranged below the inside of the protective cover 2, the left end of the pilot valve body 1 is connected to the air inlet end of the valve cover through the air inlet pipe, and an air outlet pipe is arranged at one end of the pilot valve body 2 away from the air inlet pipe;

[0013] Preferably, a wrench is movably installed on the right side of the upper end of the protective cover 2, and a lifting frame is movably installed on the inner part of the upper end of the protective cover 2. The left side of the lifting frame is movably connected to the protective cover 2 through a rotating shaft, and the top end of the valve stem 3 is movably socketed with the lifting frame.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] This is a new type of pilot-operated safety valve. Fluid enters from the inlet and is then input into the pilot valve body 1 and the pilot valve body 2 through the guide pipe. At this time, the fluid lifts the piston 2 and compresses the spring 2. The fluid enters the valve cover through the intake pipe and presses down the piston 1. After the piston drops in a straight line, it drives the valve stem 2 and the valve stem 1 to drop synchronously. The valve stem 1 compresses the spring 1, and the valve stem 2 drives the valve disc to drop, so that the passage between the inlet and the outlet is opened, and the pressure is quickly released. In addition, since the valve disc opens downward, the sealing performance can be improved to prevent leakage.

[0016] The invention relates to a novel pilot-operated safety valve. When the inlet pressure is reduced, the second spring controls the third valve stem to drive the second piston to descend, so as to close the passage between the air inlet pipe and the guide pipe and open the passage between the air inlet pipe and the air outlet pipe at the same time. The first spring lifts the first valve stem. After the first valve stem is lifted, the first piston is controlled to press the fluid inside the valve cover into the air inlet pipe and then discharged through the air outlet pipe. When the second piston needs to be lifted manually, the wrench is pulled up, and the upper end of the wrench lifts the right side of the lifting frame. When the right side of the lifting frame flips upward, the third valve stem is lifted. When the third valve stem is lifted, the second piston is pulled to rise linearly and the second spring is compressed, so that the passage between the guide pipe and the air inlet pipe is opened. In this way, manual operation can be performed in an emergency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall main structure of the utility model;

[0018] Figure 2 For the utility model Figure 1 The enlarged schematic diagram at A in the middle;

[0019] Figure 3 For the utility model Figure 1 The enlarged schematic diagram of point B in the middle;

[0020] Figure 4 For the utility modelFigure 1 Enlarged schematic view at position C in the middle.

[0021] In the figure: 1. Main valve body; 2. Valve cover; 3. First protective cover; 4. First guide valve body; 5. Second guide valve body; 6. Second protective cover; 7. Inlet; 8. Outlet; 9. Guide pipe; 10. Second valve stem; 11. Valve flap; 12. First spring; 13. First valve stem; 14. First piston; 15. Second piston; 16. Third valve stem; 17. Second spring; 18. Inlet pipe; 19. Outlet pipe; 20. Wrench; 21. Lifting frame. Specific implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] As Figures 1-4 shown, a technical solution provided by the present invention:

[0024] A new type of pilot-operated safety valve includes a main valve body 1. A valve cover 2 is provided at the upper end of the main valve body 1. A first protective cover 3 is provided at the upper end of the valve cover 2. An opening and closing mechanism one is provided between the first protective cover 3, the valve cover 2 and the main valve body 1. The opening and closing mechanism one includes a second valve stem 10. The second valve stem 10 is movably installed in the middle inside of the main valve body 1. The bottom end of the second valve stem 10 is located at the upper end inside the inlet 7 and is provided with a valve flap 11. A first valve stem 13 is movably installed inside the first protective cover 3 through a first spring 12; The opening and closing mechanism one further includes a first piston 14. The first piston 14 is movably installed between the inside of the main valve body 1 and the valve cover 2. The bottom end of the first valve stem 13 penetrates through the valve cover 2 and is fixedly connected to the first piston 14. The top end of the second valve stem 10 penetrates through the main valve body 1 and is fixedly connected to the first piston 14; A further inlet 7 is provided below the main valve body 1. An outlet 8 is provided on the left side of the main valve body 1. One end of the main valve body 1 away from the outlet 8 is connected to the lower end of a first guide valve body 4 through a guide pipe 9; A first guide valve body 4 is provided outside the right side of the main valve body 1. A second guide valve body 5 is provided at the upper end of the first guide valve body 4. A second protective cover 6 is provided at the upper end of the second guide valve body 5. An opening and closing mechanism two is provided between the second guide valve body 5, the first guide valve body 4 and the second protective cover 6; The opening and closing mechanism two includes a second piston 15. The second piston 15 is movably installed between the inside of the second guide valve body 5 and the first guide valve body 4. The top end of the second piston 15 is provided with a third valve stem 16. The top end of the third valve stem 16 penetrates through the second protective cover 6 and is located inside the second protective cover 6. A second spring 17 connected to the third valve stem 16 is provided below the inside of the second protective cover 6. The left end of the first guide valve body 4 is connected to the intake end of the valve cover 2 through an intake pipe 18. An outlet pipe 19 is provided at one end of the second guide valve body 5 away from the intake pipe 18;

[0025] In this embodiment, the fluid enters from the inlet 7 and then is input into the first guide valve body 4 and the second guide valve body 5 through the guide pipe 9. At this time, the fluid lifts the second piston 15 and compresses the second spring 17. The fluid enters the valve cover 2 through the intake pipe 18 and presses down the first piston 14. After the first piston 14 linearly descends, it drives the second valve stem 10 and the first valve stem 13 to descend synchronously. The first valve stem 13 compresses the first spring 12. The second valve stem 10 drives the valve flap 11 to descend, so that the passage between the inlet 7 and the outlet 8 is opened, and rapid pressure relief is achieved. And because the valve flap 11 opens downward, the sealing performance can be improved to prevent leakage.

[0026] As Figure 1 and Figure 4 shown, a wrench 20 is movably installed outside the upper right side of the second protective cover 6. A lifting frame 21 is movably installed inside the upper end of the second protective cover 6. The left side of the lifting frame 21 is movably connected to the second protective cover 6 through a rotating shaft. The top end of the third valve stem 16 is movably sleeved with the lifting frame 21;

[0027] In this embodiment, when the pressure at the inlet 7 is reduced, the second spring 17 controls the third control valve rod 16 to drive the second piston 15 to descend, closing the passage between the intake pipe 18 and the guide pipe 9, and at the same time opening the passage between the intake pipe 18 and the outlet pipe 19. Also, the first spring 12 lifts the first valve rod 13. After the first valve rod 13 is lifted, it controls the first piston 14 to press the fluid inside the valve cover 2 into the intake pipe 18 and then discharge it through the outlet pipe 19. When it is necessary to manually lift the second piston 15, pull up the wrench 20. The upper end of the wrench 20 jacks up the right side of the lifting frame 21. When the right side of the lifting frame 21 flips upward, it lifts the third valve rod 16. When the third valve rod 16 rises, it pulls the second piston 15 to rise linearly and compresses the second spring 17, opening the passage between the guide pipe 9 and the intake pipe 18, so that manual operation can be carried out in case of emergency.

[0028] Working principle: During operation, the fluid enters from the inlet 7 and then is input into the first guide valve body 4 and the second guide valve body 5 through the guide pipe 9. At this time, the fluid jacks up the second piston 15 and compresses the second spring 17. The fluid enters the valve cover 2 through the intake pipe 18 and presses down the first piston 14. After the first piston 14 descends linearly, it drives the second valve rod 10 and the first valve rod 13 to descend synchronously. The first valve rod 13 compresses the first spring 12, and the second valve rod 10 drives the valve flap 11 to descend, opening the passage between the inlet 7 and the outlet 8 and quickly relieving pressure. When the pressure at the inlet 7 is reduced, the second spring 17 controls the third control valve rod 16 to drive the second piston 15 to descend, closing the passage between the intake pipe 18 and the guide pipe 9, and at the same time opening the passage between the intake pipe 18 and the outlet pipe 19. Also, the first spring 12 lifts the first valve rod 13. After the first valve rod 13 is lifted, it controls the first piston 14 to press the fluid inside the valve cover 2 into the intake pipe 18 and then discharge it through the outlet pipe 19. When it is necessary to manually lift the second piston 15, pull up the wrench 20. The upper end of the wrench 20 jacks up the right side of the lifting frame 21. When the right side of the lifting frame 21 flips upward, it lifts the third valve rod 16. When the third valve rod 16 rises, it pulls the second piston 15 to rise linearly and compresses the second spring 17, opening the passage between the guide pipe 9 and the intake pipe 18.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of pilot-operated safety valve, characterized in that: including a main valve body (1), on the upper end of the main valve body (1) there is a valve cover (2), on the upper end of the valve cover (2) there is a first protective cover (3), and an opening and closing mechanism one is arranged among the first protective cover (3), the valve cover (2) and the main valve body (1); on the outer side of the right side of the main valve body (1) there is a first guide valve body (4), on the upper end of the first guide valve body (4) there is a second guide valve body (5), on the upper end of the second guide valve body (5) there is a second protective cover (6), and an opening and closing mechanism two is arranged among the second guide valve body (5), the first guide valve body (4) and the second protective cover (6).

2. The novel pilot-operated safety valve according to claim 1, characterized in that: further below the main valve body (1) there is an inlet (7), on the left side of the main valve body (1) there is an outlet (8), and one end of the main valve body (1) far from the outlet (8) is connected and communicated with the lower end of the first guide valve body (4) through a guide pipe (9).

3. A novel pilot-operated safety valve according to claim 2, characterized in that: the opening and closing mechanism one includes a second valve rod (10), the second valve rod (10) is movably installed in the middle inside of the main valve body (1), at the bottom end of the second valve rod (10) located inside the upper end of the inlet (7) there is a valve flap (11), and inside the first protective cover (3) there is a first valve rod (13) movably installed through a first spring (12).

4. The novel pilot-operated safety valve according to claim 3, wherein: the opening and closing mechanism one further includes a first piston (14), the first piston (14) is movably installed between the inside of the main valve body (1) and the valve cover (2), the bottom end of the first valve rod (13) penetrates through the valve cover (2) and is fixedly connected to the first piston (14), and the top end of the second valve rod (10) penetrates through the main valve body (1) and is fixedly connected to the first piston (14).

5. A novel pilot-operated safety valve according to claim 1, characterized in that: the opening and closing mechanism two includes a second piston (15), the second piston (15) is movably installed between the inside of the second guide valve body (5) and the first guide valve body (4), at the top end of the second piston (15) there is a third valve rod (16), the top end of the third valve rod (16) penetrates through the second protective cover (6) and is located inside the second protective cover (6), below the inside of the second protective cover (6) there is a second spring (17) connected to the third valve rod (16), the left end of the first guide valve body (4) is connected and communicated with the air inlet end of the valve cover (2) through an air inlet pipe (18), and one end of the second guide valve body (5) far from the air inlet pipe (18) there is an air outlet pipe (19).

6. A novel pilot-operated safety valve according to claim 5, characterized in that: on the outer side of the upper right side of the second protective cover (6) there is a wrench (20) movably installed, inside the upper end of the second protective cover (6) there is a lifting frame (21) movably installed, the left side of the lifting frame (21) is movably connected to the second protective cover (6) through a rotating shaft, and the top end of the third valve rod (16) is movably sleeved with the lifting frame (21).

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