CN210739479U - Large-diameter pilot operated safety valve - Google Patents
Large-diameter pilot operated safety valve Download PDFInfo
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- CN210739479U CN210739479U CN201921250646.XU CN201921250646U CN210739479U CN 210739479 U CN210739479 U CN 210739479U CN 201921250646 U CN201921250646 U CN 201921250646U CN 210739479 U CN210739479 U CN 210739479U
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Abstract
The utility model relates to a heavy-calibre guide's formula relief valve belongs to the valve in fields such as electric power, petrochemical industry, new forms of energy, and it comprises a pilot valve, secondary pilot valve and main relief valve, mainly includes main relief valve body, main relief valve disk seat, main relief valve rod, main relief valve clack, main relief valve uide bushing, a pilot valve, telescoping device, secondary pilot valve, main relief valve gap (15), main relief valve spring. The primary pilot valve is installed on the valve body of the main safety valve through flange connection, and the secondary pilot valve is directly welded on the valve cover of the main safety valve. The pipe between the primary pilot valve and the secondary pilot valve is respectively provided with a telescopic device in the vertical direction and the horizontal direction, the length of the pipe is adjustable, and the sealing performance is good.
Description
Technical Field
The utility model relates to a heavy-calibre guide's formula relief valve belongs to the valve in fields such as electric power, petrochemical industry, new forms of energy.
Background
The pilot operated safety valve is a non-spring direct action safety valve and is widely used in the fields of electric power, petrochemical industry and the like. The large-caliber pilot operated safety valve generally adopts a vertical structure and comprises a main valve and a pilot valve, an O-shaped ring or a lip-shaped sealing ring is adopted between a valve clack of the main valve and a guide sleeve of the main valve for sealing, but the O-shaped ring or the lip-shaped sealing ring is easy to age, wear or damage for sealing, the sealing performance and the service life of the valve are seriously influenced, and the problems need to be solved urgently.
Disclosure of Invention
The utility model aims at providing a heavy-calibre guide's formula relief valve, it includes primary pilot valve, secondary pilot valve and main relief valve, and primary pilot valve installs on main relief valve body, and secondary pilot valve installs on main relief valve cover. The utility model provides a main relief valve disk seat leak, main relief valve clack bite and the pilot valve between the easy scheduling problem that leaks of connecting pipe department.
The technical scheme of the utility model a heavy-calibre guide's formula relief valve is provided, it includes main relief valve body (1), main relief valve disk seat (2), main relief valve rod (3), main relief valve clack (4), guide pin bushing A (5), main relief valve piston (6), primary pilot valve (7), main relief valve uide bushing (8), pipe (9), exhaust pipe (10), telescoping device (11), secondary pilot valve (12), guide pin bushing B (13), closing cap (14), main relief valve gap (15), main relief valve spring (16), inlet port (17) etc..
The primary pilot valve is a spring type safety valve, the primary pilot valve is connected with a main safety valve body through a flange, and the secondary pilot valve is welded on a main safety valve cover. The outlet of the primary pilot valve is connected with the right cavity of the piston of the secondary pilot valve by a pipe (9), and a telescopic device (11) is respectively arranged on the vertical direction and the horizontal direction of the pipe (9).
The telescopic device (11) consists of a cavity (11-4), a filler (11-5), an end head (11-2), a gland (11-6), a bolt (11-3) and a nut (11-1). The end head (11-2) is connected with the pipe (9) in a welding way, the cavity (11-4) is internally provided with a packing (11-5), and the packing (11-5) is compressed and sealed by a gland (11-6), a bolt (11-3) and a nut (11-1). The length of the pipe (9) can be adjusted in both vertical and horizontal directions.
The secondary pilot valve (12) is connected with a valve cover (15) of the main safety valve in a welding mode and mainly comprises a secondary valve guide sleeve (12-1), a steam exhaust pipe (12-2), a secondary valve body (12-3), a steam inlet pipe (12-4), a secondary valve cover (12-5), a secondary valve piston (12-7), a secondary valve spring (12-8), a secondary valve clack (12-10), a secondary valve rod (12-11) and the like.
A guide sleeve A (5) is arranged on a main safety valve guide sleeve (8), a guide sleeve B (13) is arranged on a main safety valve cover (15), and a main safety valve rod (3) is guided to ensure smooth action of the main safety valve. An air inlet hole (17) is formed in the main safety valve guide sleeve (8) and is communicated with the middle cavity of the main safety valve body (1) and the left cavity of the main safety valve piston (6).
Under the normal working state, under the combined action of the main safety valve spring (16) and the medium force, the main safety valve clack (4) compresses the main safety valve seat (2) for sealing. When the medium is in overpressure, after the primary pilot valve (7) is opened, the discharged medium enters a piston cavity of the secondary pilot valve (12), the thrust of the medium acting on a secondary valve piston (12-7) is larger than the medium force and the spring force acting on a valve clack (12-10) of the secondary valve, and the secondary pilot valve (12) is opened. The medium in the left cavity of the main safety valve piston (6) is rapidly discharged through the steam exhaust pipe (12-2), the main safety valve piston (6) rapidly moves along the main safety valve guide sleeve (8) under the pushing of the medium force in the left cavity of the main safety valve piston (6), and the main safety valve piston (6) drives the main safety valve clack (4) to open through the main safety valve rod (3). When the medium pressure is reduced to the recoil pressure, the primary pilot valve (7) is closed to drive the secondary pilot valve (12) to be closed, so that the medium pressure in the right cavity of the main safety valve piston (6) is quickly recovered, the medium pressures in the left cavity and the right cavity of the main safety valve piston (6) are balanced, the valve clack (4) of the main safety valve is attached to the valve seat (2) of the main safety valve under the pushing of the spring force and the medium force, and the main safety valve is closed.
The invention has the beneficial effects that: according to the large-caliber pilot operated safety valve, the valve rod (3) of the main safety valve is guided by the guide sleeve A (5) of the guide sleeve (8) of the main safety valve and the guide sleeve B (13) of the valve cover (15) of the main safety valve at two points, so that smooth action of the valve is guaranteed; the primary pilot valve is connected by a flange and is directly arranged on the main safety valve body (1), so that the primary pilot valve is convenient to assemble and disassemble, and leakage points of pipeline connection are effectively avoided; a telescopic device (11) is arranged between the primary pilot valve (7) and the secondary pilot valve (12), so that the length of the primary pilot valve and the length of the secondary pilot valve can be adjusted in the vertical direction and the horizontal direction, and the sealing is reliable.
Drawings
FIG. 1 is a schematic structural diagram of a large-caliber pilot operated safety valve
FIG. 2 is a schematic view of the structure of the telescopic device
FIG. 3 is a schematic diagram of a secondary pilot valve
In the figure, 1 is a main safety valve body, 2 is a main safety valve seat, 3 is a main safety valve rod, 4 is a main safety valve clack, 5 is a guide sleeve A, 6 is a main safety valve piston, 7 is a primary pilot valve, 8 is a main safety valve guide sleeve, 9 is a pipe, 10 is a steam exhaust pipe, 11 is a telescopic device (11-1 is a nut, 11-2 is an end head, 11-3 is a bolt, 11-4 is a cavity, 11-5 is a filler, 11-6 is a gland), 12 is a secondary pilot valve (12-1 is a secondary valve guide sleeve, 12-2 is a steam exhaust pipe, 12-3 is a secondary valve body, 12-4 is a steam inlet pipe, 12-5 is a secondary valve cover, 12-6 is a nut, 12-7 is a secondary valve piston, 12-8 is a secondary valve spring, 12-9 is a bolt, 12-10 is a secondary valve clack, 12-11 secondary valve stem), 13 guide sleeve B, 14 sealing cover, 15 main safety valve cover, 16 main safety valve spring, 17 air inlet hole
Detailed Description
In the embodiment shown in fig. 1, fig. 2, fig. 3, the utility model discloses a heavy-calibre guide formula relief valve comprises primary pilot valve, secondary pilot valve and main relief valve, mainly includes main relief valve body (1), main relief valve disk seat (2), main relief valve rod (3), main relief valve clack (4), guide pin bushing A (5), main relief valve piston (6), primary pilot valve (7), main relief valve uide bushing (8), steam exhaust pipe (10), telescoping device (11), secondary pilot valve (12), guide pin bushing B (13), main relief valve lid (15), main relief valve spring (16), spare parts such as inlet port (17). The primary pilot valve is installed on the valve body of the main safety valve through flange connection, and the secondary pilot valve is directly welded on the valve cover of the main safety valve.
A guide sleeve A (5) is arranged on a guide sleeve (8) of the main safety valve, a guide sleeve B (13) is arranged on a valve cover (15) of the main safety valve, and the valve rod (3) of the main safety valve is guided; an air inlet hole (17) is formed in the main safety valve guide sleeve (8) and is communicated with the middle cavity of the main safety valve body (1) and the lower cavity of the main safety valve piston (6).
The primary pilot valve is a spring type safety valve, the outlet of the primary pilot valve is connected with the upper cavity of the piston of the secondary pilot valve through a pipe (9), and a telescopic device (11) is respectively arranged on the vertical direction and the horizontal direction of the pipe (9). The telescopic device (11) consists of a cavity (11-4), a filler (11-5), an end head (11-2), a gland (11-6), a bolt (11-3) and a nut (11-1). The end (11-2) is connected with the pipe (9) in a welding way, the cavity (11-4) is internally provided with a packing (11-5), and the packing (11-5) is pressed by a gland (11-6), a bolt (11-3) and a nut (11-1) to keep sealing. The length of the pipe (9) can be adjusted in both vertical and horizontal directions.
The secondary pilot valve (12) mainly comprises a secondary valve guide sleeve (12-1), a steam exhaust pipe (12-2), a secondary valve body (12-3), a steam inlet pipe (12-4), a secondary valve cover (12-5), a secondary valve piston (12-7), a secondary valve spring (12-8), a secondary valve clack (12-10), a secondary valve rod (12-11) and other parts. The right cavity of the secondary valve piston (12-7) is communicated with the primary pilot valve (7), and the secondary pilot valve (12) is communicated with the right cavity of the main safety valve piston (6) after being opened.
Under the normal working state, under the combined action of the main safety valve spring (16) and the medium force, the main safety valve clack (4) compresses the main safety valve seat (2) for sealing. When the medium exceeds the set pressure, after the primary pilot valve (7) is opened, the discharged medium enters a piston cavity of the secondary pilot valve (12), the thrust of the medium acting on the secondary valve piston (12-7) is larger than the medium force and the spring force acting on a valve clack (12-10) of the secondary valve, and the secondary pilot valve (12) is opened. After the secondary pilot valve (12) is opened, a medium in a right cavity of a main safety valve piston (6) is rapidly discharged through a steam exhaust pipe (12-2), the left cavity of the main safety valve piston (6) is communicated with a middle cavity of a main safety valve body (1), under the pushing of medium force, the main safety valve piston (6) rapidly moves along a main safety valve guide sleeve (8), and the main safety valve piston (6) drives a main safety valve clack (4) to be opened through a main safety valve rod (3). When the medium pressure is reduced to the return pressure, the primary pilot valve (7) is closed, the high-pressure medium in the right cavity of the piston of the secondary pilot valve (12) is cut off, and the secondary pilot valve (12) is closed under the action of spring force. The medium pressure in the right cavity of the main safety valve piston (6) is recovered rapidly, so that the medium pressure in the left cavity and the right cavity of the main safety valve piston (6) is balanced, the main safety valve clack (4) moves rapidly under the pushing of the spring force and the medium force of the main safety valve, the main safety valve clack (4) is tightly attached to the main safety valve seat (2), and the main safety valve is closed.
Claims (3)
1. A large-caliber pilot operated safety valve is characterized in that: the safety valve mainly comprises a main safety valve body (1), a main safety valve seat (2), a main safety valve rod (3), a main safety valve clack (4), a guide sleeve A (5), a main safety valve piston (6), a primary pilot valve (7), a main safety valve guide sleeve (8), a steam exhaust pipe (10), a telescopic device (11), a secondary pilot valve (12), a guide sleeve B (13), a main safety valve cover (15) and a main safety valve spring (16); the primary pilot valve is installed on the valve body of the main safety valve through flange connection, and the secondary pilot valve is directly welded on the valve cover of the main safety valve.
2. The large-bore pilot operated safety valve according to claim 1, wherein: the connecting pipe between the primary pilot valve and the secondary pilot valve is respectively provided with a telescopic device in the vertical direction and the horizontal direction, and the length of the pipe (9) can be adjusted.
3. The large-bore pilot operated safety valve according to claim 1, wherein: the telescopic device (11) is provided with a packing (11-5) and is pressed and sealed by a gland (11-6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921250646.XU CN210739479U (en) | 2019-07-27 | 2019-07-27 | Large-diameter pilot operated safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921250646.XU CN210739479U (en) | 2019-07-27 | 2019-07-27 | Large-diameter pilot operated safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210739479U true CN210739479U (en) | 2020-06-12 |
Family
ID=70983641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921250646.XU Active CN210739479U (en) | 2019-07-27 | 2019-07-27 | Large-diameter pilot operated safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210739479U (en) |
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2019
- 2019-07-27 CN CN201921250646.XU patent/CN210739479U/en active Active
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