CN210088095U - Large-caliber multistage pilot operated safety valve - Google Patents
Large-caliber multistage pilot operated safety valve Download PDFInfo
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- CN210088095U CN210088095U CN201920336565.5U CN201920336565U CN210088095U CN 210088095 U CN210088095 U CN 210088095U CN 201920336565 U CN201920336565 U CN 201920336565U CN 210088095 U CN210088095 U CN 210088095U
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Abstract
The utility model relates to a multistage pilot operated relief valve of heavy-calibre belongs to the valve in fields such as electric power, petrochemical industry. It is mainly composed of main valve body, main valve seat, main valve clack, main valve guide sleeve, main valve spring, main valve cover, primary pilot valve and secondary pilot valve. The inlet of the main valve body is communicated with the upper part of the main valve clack, the outlet side of the valve body is communicated with the lower part of the sealing surface of the main valve clack, and the outer circumferential surface of the main valve clack is not required to be provided with a sealing ring. When the medium is over-pressurized, the primary pilot valve is opened, the discharged medium enters a secondary pilot valve piston cavity to push the secondary pilot valve to open, the medium in the upper cavity of the main valve clack is quickly released, the main valve clack moves upwards in the guide sleeve under the push of the valve inlet medium, the main valve is opened, and the medium is discharged.
Description
Technical Field
The invention relates to a large-caliber multistage pilot operated safety valve, belonging to valves in the fields of electric power, petrochemical industry and the like.
Background
The safety valve with large discharge capacity required in the fields of electric power, petrochemical industry and the like generally adopts a pilot safety valve which consists of a main valve and a pilot valve. The valve clack of the main valve moves up and down in the guide sleeve of the main valve in the working process of the existing large-caliber pilot operated safety valve, so that the opening and closing of the main valve and the discharge of media are realized. The pilot valve is a spring direct action type safety valve and controls the opening and closing of the main valve. Utility model patent grant publication No. CN 205781142U and utility model patent grant publication No. CN 201753791U disclose a guide's formula relief valve, it is sealed that main valve clack and main valve uide bushing adopt O shape circle or lip seal circle, and O shape circle or lip seal circle are sealed to be very easily ageing, wearing and tearing or damage, seriously influence valve leakproofness and life. The above problems are urgently needed to be solved.
Disclosure of Invention
The invention aims to provide a large-caliber multistage pilot operated safety valve which comprises a primary pilot valve, a secondary pilot valve and a main valve, wherein the primary pilot valve and the secondary pilot valve are arranged on a valve cover of the main valve. The invention solves the problems of main valve leakage, main valve clack jamming and the like.
The technical scheme of the invention is to provide a large-caliber multi-stage pilot operated safety valve which comprises a main valve body, a main valve seat, a main valve clack, a main valve guide sleeve, a main valve spring, a main valve bonnet, a primary pilot valve, a secondary pilot valve, a steam exhaust pipe and the like.
The primary pilot valve is a spring direct action type safety valve and a back pressure balanced type structure. The valve mainly comprises a primary valve body, a primary valve seat, an upper adjusting ring, a primary valve guide sleeve, a primary valve spring cover, a primary valve rod, an adjusting screw, a balance piston, a lower adjusting ring, a primary valve exhaust pipe, a primary valve clack and other parts. The valve clack moves up and down in the guide sleeve to realize the opening and closing of the valve, and the adjusting screw changes the compression amount of the spring, so that the take-off pressure of the valve is adjusted; the upper adjusting ring and the lower adjusting ring change the flow direction of a medium and adjust the take-off pressure and the opening and closing pressure difference of the valve; the valve is provided with a balance piston which is integrated with the valve rod, so that the influence of backpressure change on the action performance of the valve is prevented; the valve inlet of the primary pilot valve is not directly connected with the main valve inlet through the main valve clack, the thrust of the medium acting on the valve clack is larger than the spring force when the medium is in overpressure, and the primary pilot valve is opened.
The secondary pilot valve has a check structure and mainly comprises a locking nut, a piston, a secondary valve spring, a secondary valve rod, a secondary valve outlet, a secondary valve steam outlet, a secondary valve seat, a secondary valve clack, a secondary valve body and other parts. The piston chamber of secondary pilot valve communicates with the export of primary pilot valve, and the entry and the main valve clack epicoele of secondary pilot valve communicate, and the export of secondary pilot valve communicates with the main valve export through the exhaust pipe, secondary valve body and a valve body formula structure as an organic whole. The valve rod of the secondary valve is connected with the valve clack and the piston, and under the normal working state, the spring force and the medium force assist the sealing of the valve clack of the secondary valve; after the primary pilot valve is opened, the discharged medium enters a secondary valve piston cavity, the thrust of the medium acting on the piston is larger than the medium force of the medium acting on the valve clack of the upper cavity of the main valve clack plus the spring force, and the secondary pilot valve is opened.
The valve seat of the main valve is welded with the valve body, and the valve seat is provided with two round R-shaped anti-cracking grooves to prevent cracks during welding and cold-hot alternation; and (3) overlaying a cobalt-based hard alloy (Stellite) on the sealing surface of the valve seat, wherein the thickness of the cobalt-based hard alloy layer is more than 6 mm. The excircle of the valve clack of the main valve is provided with a plurality of balance grooves, and after the safety valve is opened, a medium is equalized by the balance grooves, so that the valve clack is centered in the action process, and the valve is sealed; the main valve clack sealing surface is provided with a lip sealing pair, a gathering groove and a supporting surface, and the angle a2 of the lip sealing pair is larger than the angle a 1; the lowest part of the valve clack of the main valve is provided with a 45-degree drain hole for draining condensed water; the upper part of the valve clack is provided with a spring to assist the valve to close. After the secondary pilot valve is opened, the medium in the upper cavity of the main valve clack is drained quickly, the medium pressure in the lower part of the main valve clack is greater than that in the upper cavity of the main valve clack, the medium pushes the valve clack to move upwards quickly in the guide sleeve, and the valve is opened.
The invention has the beneficial effects that: according to the large-caliber multi-stage pilot operated safety valve, the inlet of the main valve body is communicated with the upper part of the main valve clack, the outlet side of the valve body is communicated with the lower part of the sealing surface of the main valve clack, and the outer circumferential surface of the main valve clack is not required to be provided with a sealing ring, so that the service life and the sealing property of the valve are greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of a large-caliber multi-stage pilot operated safety valve
FIG. 2 is a schematic diagram of the primary and secondary pilot valves
FIG. 3 is a schematic view of the main valve flap
FIG. 4 is a schematic view of the structure of the main valve seat
In the figure, 1, a main valve body, 2, a main valve seat, 3, a main valve flap, 301, a discharge hole, 302, a balance groove, 303, a lip seal pair, 304, a gathering groove, 305, a support surface, 4, a main valve guide sleeve, 5, a main valve spring, 6, a main valve bonnet, 7, a primary pilot valve, 701, a primary valve body, 702, a primary valve seat, 703, an upper adjusting ring, 704, a primary valve guide sleeve, 705, a primary valve spring, 706, a primary valve spring cover, 707, a primary valve stem, 708, an adjusting screw, 709, a primary valve piston, 710, a lower adjusting ring, 711, a primary valve exhaust pipe, 712, a primary flap, 8, a secondary pilot valve, 801, a locking nut, 802, a secondary valve piston, 803, a secondary valve spring, 804, a secondary valve stem, 805, a secondary valve outlet, 806, a secondary valve seat, 807, a secondary valve flap, 808, a secondary valve body, 9, a steam exhaust pipe, a secondary, 10. And welding anti-cracking grooves A and 11 and welding anti-cracking grooves B.
Detailed Description
In the embodiment shown in fig. 1, 2, 3 and 4, the large-diameter multi-stage pilot operated safety valve of the present invention is a two-stage pilot operated safety valve, which includes a main valve body 1, a main valve seat 2, a main valve flap 3, a main valve guide sleeve 4, a main valve spring 5, a main valve bonnet 6, a primary pilot valve 7, a secondary pilot valve 8, a steam exhaust pipe 9, etc., wherein the primary pilot valve and the secondary pilot valve are mounted on the main valve bonnet. When medium is over-pressurized, the primary pilot valve is opened, the discharged medium enters a secondary pilot valve piston cavity, the piston is pushed to drive the valve clack of the secondary valve to move downwards, the secondary pilot valve is opened, the medium in the upper cavity of the valve clack of the main valve is quickly released, the medium pressure in the upper cavity of the valve clack of the main valve is quickly reduced and is far lower than the medium pressure in the lower part of the valve clack, the valve clack of the main valve is quickly moved upwards.
As shown in fig. 2, the primary pilot valve is a spring-direct-acting safety valve, and the primary pilot valve inlet is directly connected to the inlet of the main valve without passing through the main valve flap. It mainly comprises the following parts: the valve comprises a primary valve body 701, a primary valve seat 702, an upper adjusting ring 703, a primary valve guide sleeve 704, a primary valve spring 705, a primary valve spring cover 706, a primary valve stem 707, an adjusting screw 708, a balance piston 709, a lower adjusting ring 710, a primary valve exhaust pipe 711 and a primary valve clack 712. The primary pilot valve is of a back pressure balanced structure, a balance piston 709 is arranged, the balance piston 709 and a valve rod 707 are of an integrated structure, the back pressure of the valve is balanced, the action performance of the valve is kept stable, and a steam exhaust pipe is communicated with an inner cavity of the spring cover and an outlet of the secondary pilot valve; the valve is provided with an upper adjusting ring and a lower adjusting ring, the upper adjusting ring adjusts the opening and closing pressure difference of the valve by changing the flow direction of a medium, and the lower adjusting ring is used for adjusting the take-off precision of the valve. The spring cover is provided with an adjusting screw, and the valve take-off pressure is adjusted by changing the compression amount of the spring. The spring compresses the valve clack through the valve rod, and in a working state, the spring force is greater than the medium force, and the valve is closed and sealed; when the medium exceeds the setting pressure, the medium force is larger than the spring force, the valve clack is pushed to move upwards in the guide sleeve, the primary pilot valve is opened, and the discharged medium enters the secondary pilot valve piston cavity through the valve outlet.
As shown in fig. 2, the secondary pilot valve 8 has a check structure, and mainly includes a lock nut 801, a piston 802, a secondary valve spring 803, a secondary valve stem 804, a secondary valve outlet 805, a secondary valve seat 806, a secondary valve flap 807, and a secondary valve body 808. The secondary valve rod 804 and the valve clack 807 are of an integrated structure, the secondary valve rod 804 is connected with the piston 802 through a locking nut 801, a spring 803 is arranged below the piston 802, and the spring force and the medium force assist the sealing of the valve clack of the secondary valve; the secondary valve body 808 and the primary valve body 701 are of an integrated structure, and the valve body presses the valve seat of the secondary valve; the piston cavity of the secondary pilot valve is communicated with the outlet of the primary pilot valve, the inlet of the secondary pilot valve is communicated with the upper cavity of the main valve clack, and the outlet 805 of the secondary valve is communicated with the outlet of the main valve through a steam exhaust pipe 9. After the primary pilot valve is opened, the discharged medium enters a secondary valve piston cavity, the thrust of the medium acting on the piston is larger than the medium force of the medium acting on the valve clack of the upper cavity of the main valve clack plus the spring force, and the secondary pilot valve is opened.
The main valve comprises a main valve body 1, a main valve seat 2, a main valve clack 3, a main valve guide sleeve 4, a main valve spring 5, a main valve bonnet 6 and the like. As shown in fig. 4, the main valve seat is provided with two round R-shaped anti-cracking grooves, and the valve seat is welded with the main valve body; and (3) overlaying a cobalt-based hard alloy (Stellite) on the sealing surface of the valve seat, wherein the thickness H of the cobalt-based hard alloy layer is more than 6 mm. As shown in fig. 3, a plurality of balance grooves 302 are arranged on the outer circle of the main valve flap, and after the safety valve is opened, the valve flap is ensured to move in the center; the sealing surface of the main valve flap is provided with a lip-shaped sealing pair 303, a gathering groove 304 and a supporting surface 305, the angle a2 of the lip-shaped sealing pair 303 is larger than the angle a1, and when the valve is closed, a medium presses the lip-shaped sealing pair to ensure the sealing of the valve; when the valve jumps, the leaked medium is collected in the collecting tank to quickly open the valve; when the valve returns to the seat, the supporting surface contacts with the valve seat to bear the impact force, and the lip-shaped sealing pair is effectively prevented from deforming. The lowest department of main valve clack sets up 45 degrees drain holes 301 for excrete the comdenstion water, prevent valve clack epicoele ponding. The upper part of the valve clack is provided with a spring to assist the valve to close. After the secondary pilot valve is opened, the medium in the upper cavity of the main valve clack is drained quickly to make the medium pressure in the lower part of the main valve clack greater than that in the upper cavity, and the medium pushes the valve clack to move upwards in the guide sleeve quickly to open the valve for draining the medium from the container.
Claims (4)
1. The utility model provides a multistage pilot operated relief valve of heavy-calibre, it mainly includes main valve body (1), main valve disk seat (2), main valve clack (3), main valve uide bushing (4), main valve spring (5), main valve gap (6), primary pilot valve (7), secondary pilot valve (8), exhaust pipe (9), characterized by: the primary pilot valve and the secondary pilot valve are arranged on the main valve cover, and the primary pilot valve is directly connected with the inlet of the main valve without passing through the valve clack of the main valve.
2. The large-caliber multi-stage pilot operated safety valve according to claim 1, wherein: the lowest part of the main valve clack (3) is provided with a 45-degree drain hole; the sealing surface of the main valve clack (3) is provided with a lip-shaped sealing pair, a gathering groove and a supporting surface.
3. The large-caliber multi-stage pilot operated safety valve according to claim 1, wherein: the main valve seat (2) is provided with a circular welding anti-cracking groove A and a circular welding anti-cracking groove B; the thickness H of the cobalt-based hard alloy layer welded on the sealing surface of the valve seat is larger than 6 mm.
4. The large-caliber multi-stage pilot operated safety valve according to claim 1, wherein: the inlet side of the main valve body is communicated with the upper part of the main valve clack, the outlet side of the valve body is communicated with the lower part of the sealing surface of the main valve clack, and a sealing ring is not arranged on the circumference of the outer diameter of the main valve clack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920336565.5U CN210088095U (en) | 2019-03-08 | 2019-03-08 | Large-caliber multistage pilot operated safety valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920336565.5U CN210088095U (en) | 2019-03-08 | 2019-03-08 | Large-caliber multistage pilot operated safety valve |
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| CN210088095U true CN210088095U (en) | 2020-02-18 |
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| CN201920336565.5U Active CN210088095U (en) | 2019-03-08 | 2019-03-08 | Large-caliber multistage pilot operated safety valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030412A (en) * | 2019-03-08 | 2019-07-19 | 哈电集团哈尔滨电站阀门有限公司 | A kind of heavy caliber multistage pilot operated safety valve |
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2019
- 2019-03-08 CN CN201920336565.5U patent/CN210088095U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030412A (en) * | 2019-03-08 | 2019-07-19 | 哈电集团哈尔滨电站阀门有限公司 | A kind of heavy caliber multistage pilot operated safety valve |
| CN110030412B (en) * | 2019-03-08 | 2024-06-04 | 哈电集团哈尔滨电站阀门有限公司 | Large-caliber multi-stage pilot operated safety valve |
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