CN203463741U - Low-pressure large-diameter safety valve - Google Patents
Low-pressure large-diameter safety valve Download PDFInfo
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- CN203463741U CN203463741U CN201320573135.8U CN201320573135U CN203463741U CN 203463741 U CN203463741 U CN 203463741U CN 201320573135 U CN201320573135 U CN 201320573135U CN 203463741 U CN203463741 U CN 203463741U
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- valve body
- disc holder
- safety valve
- valve
- cover plate
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Abstract
The utility model relates to a safety valve for overpressure protection of a pressure system, in particular to a spring-direct-acting type low-pressure large-diameter safety valve. The guide sleeve of the safety valve is connected between a valve body and a cover plate; a valve bonnet is mounted on the upper surface of the cover plate; in the cavity of the valve body, a positioning screw is connected to a side hole in the valve body, and an adjusting ring is connected with the valve body; an O-shaped ring is embedded in a groove formed by a valve flap and a disc holder, and fixed at the lower end of the disc holder; an assembly formed by the O-shaped ring, the valve flap and the disc holder is pressed on the sealing surface of the valve body through a spring; the spring and an upper spring seat are integrally arranged in a cavity formed by the disc holder, the guide sleeve and the cover plate; the spring directly acts on the disc holder; an adjusting screw is mounted on the cover plate; a locking nut is mounted at the upper end of the adjusting screw; the adjusting screw transmits a force to the spring through a thrust washer, a bearing and the upper spring seat so as to adjust set pressure; the disc holder and the sealing surface of the valve body are both ground so as to form metallic seal; non-metallic elastic seal is formed between the O-shaped ring and the sealing surface of the valve body.
Description
Technical field
The utility model relates to a kind of safety valve for pressure system overpressure protection, is specially a kind of low pressure heavy caliber spring direct-operated relief valve.
Background technique
Spring direct acting safety valve is a kind of automatic valve, automatically opens the fluid of discharging certain load quantity, in case locking system internal pressure surpasses predetermined safety value when system pressure reaches Set pressure.When pressure recovers normal, valve will be gone again and be closed to prevent that medium from continuing to flow out.
Along with the industry unit scales such as petrochemical industry, electric power and desired single device thereof are constantly to large scale development, traditional as the maximum Flow area code name " T " of stipulating in API526 < < steel flanges Decompression valves > >, (effectively Flow area is 167.742cm
2) safety valve also often can not meet the demand of actual use.If select the safety valve of the Flow area of regulation in many API 526 to meet the demand of discharge capacity, the increase that first can bring equipment cost, secondly also can give the increase difficulty such as pipe arrangement, maintenance of valve are installed, and finally also can reduce the reliability of system.
For the application of the large discharge capacity operating modes of some low pressure such as large-size spherical tank, conventional security valve in valve cover cavity, conducts to Disc holder by valve rod by spring force by spring fitting, and such structural design often cannot meet the performance of this type of operating mode.For being installed on operating mode indoor or tower top higher position, as large-scale compressor, large oil tank etc., often the size of safety valve and weight are had to certain restriction, large, the whole valve weight of heavy caliber safety valve boundary dimension common on market is large, be unfavorable for safety valve installation, transport, use and maintenance etc.For low pressure operating mode, the sealing of safety valve is also the technological difficulties of more difficult realization, and at present, the seal form that safety valve is conventional has metal sealing and nonmetal elastic packing.Metal sealing leak-down rate is larger, is not suitable for the operating mode of severe toxicity, the medium such as inflammable.Although simple nonmetal elastic packing safety valve sealing increases compared with metal sealing safety valve, in safety valve closing process, can there is greater impact to nonmetal sealing material, to producing a very large impact its working life.Therefore need to develop a kind of for low pressure, little, lightweight, the good airproof performance of installation dimension, can protect sealing material and the heavy caliber safety valve of auxiliary seal function is provided.
Summary of the invention
The purpose of this utility model is to provide a kind of low pressure heavy caliber safety valve, to meet the demand.
For achieving the above object, technical solution adopted in the utility model is:
A kind of low pressure heavy caliber safety valve, its agent structure consists of valve body, guide pin bushing, cover plate and the bonnet of valve seat valve body integral type, guide pin bushing is connected in the middle of valve body and cover plate, bonnet is arranged on above cover plate, in valve body chamber, positioning screwn is connected to valve body side opening place, is connected with Adjusting ring on valve body, and Adjusting ring regulates by positioning screwn; O type circle embeds in the groove of flap and Disc holder formation, by hex screw, be fixed on the disk body lower end of Disc holder, form an assemblying body, this assemblying body is pressed in by spring on the sealing surface of valve body, and this assemblying body and valve body, Adjusting ring form the main flow passage structure of safety valve jointly; Spring and upper spring seat integral body are positioned at the cavity consisting of Disc holder, guide pin bushing and cover plate, and spring is directly installed on Disc holder; Adjust screw and install on the cover board, locking nut is arranged on the upper end of adjusting screw, adjusts screw, by thrust washer, bearing and upper spring seat, power is conducted to spring, and Set pressure is regulated; The sealing surface of Disc holder and valve body all, through grinding, forms metal sealing; The sealing surface of O type circle and valve body forms nonmetal elastic packing.
The working procedure of described safety valve is as follows: in safety valve closed condition, nonmetal elastic packing plays primary seal effect, the medium of safety valve ingress can enter the groove at flap place, system pressure is conducive to compress O type circle, also help the sealing surface that compresses Disc holder, the sealing force that increases the metal sealing that the sealing surface of itself and valve body forms, realizes zero leakage; When safety valve is opened, savings is released by the groove at flap place at the pressure at Disc holder, flap and O type circle place, to avoid O type circle because the pressure gathering is blown; When system pressure declines, Disc holder drives O type circle and flap to return seat under spring action, returns in seat process, and O type circle, because of the metal spacing of the metal sealing formation of the sealing surface of Disc holder and valve body, can not be subject to larger impact and compression.
The material of described valve body, Disc holder, bonnet is aluminium; The material of described O type circle is fluorine rubber.
Described guide pin bushing is bolted in the middle of valve body and cover plate.
Described bonnet is arranged on above cover plate by screw thread.
Described positioning screwn is threaded connection at valve body side opening place.
Described adjustment screw is installed on the cover board by screw thread.
Described locking nut is arranged on the upper end of adjusting screw by screw thread.
The obtained beneficial effect of the utility model is:
The utility model has designed a kind of heavy caliber safety valve that is directly installed on Disc holder, metal sealing and nonmetal elastic packing double seal for valve seat valve body integral type, the spring of low pressure.This safety valve has larger discharge capacity, can be widely used in the large-scale plant of the industries such as petrochemical industry, electric power.This safety valve is directly installed on Disc holder, cancels valve gap valve rod, is used the improvement of the structural designs such as cover plate by valve seat valve body integral type design, spring, spring-force driven dual point is reduced, reduces guide elements quantity, therefore can realize the performance of low pressure operating mode, Overpressure of a safety valve≤10%, Blowdown of a safety valve≤5%; By body element material selection aluminium such as valve bodies, cancel valve gap, valve rod, reduce number of spare parts, optimizing structure design, thereby valve monnolithic case size is less, compact structure, whole valve weight is approximately 1/3 of like product weight, is applicable to the operating mode that pipe arrangement difficulty is installed in indoor or tower top higher position etc.; This safety valve also has the design of Sealing Structure of nonmetal elastic packing and metal sealing double seal, combine both advantages, not only can provide auxiliary seal to meet the sealing of improving metal sealing, realize zero leakage, can meet the seal request of low pressure operating mode, reduce dielectric loss and the pollution to environment thereof, and the working life of the nonmetal sealing material of significant prolongation, for energy-saving and emission-reduction, have great importance.By custom-designed groove structure on flap, not only improve the sealing of nonmetal elastic packing, and the sealing of the metal sealing of the formation of increase Disc holder and valve body, the metal spacing that this metal sealing forms also can reduce the suffered impact in safety valve closing process of O type circle, extend the working life of O type circle, thereby can meet the seal request of low pressure operating mode.
Accompanying drawing explanation
Fig. 1 is low pressure heavy caliber safety valve structure schematic diagram described in the utility model;
Fig. 2 is double sealing structure partial enlarged drawing;
Fig. 3 is safety valve opening state double sealing structure partial enlarged drawing;
In figure: 1, valve body; 2, flap; 3, Disc holder; 4, guide pin bushing; 5, Adjusting ring; 6, cover plate; 7, bonnet; 8, adjust screw; 9, spring; 10, positioning screwn; 11, thrust washer; 12, locking nut; 13, bearing; 14, upper spring seat; 15, hex screw; 16, O type circle.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
As shown in Figure 1, low pressure heavy caliber safety valve agent structure described in the utility model consists of valve body 1, guide pin bushing 4, cover plate 6 and the bonnet 7 of valve seat valve body integral type.Guide pin bushing 4 is bolted in the middle of valve body 1 and cover plate 6, and bonnet 7 is arranged on above cover plate 6 by screw thread.In valve body chamber, positioning screwn 10 is threaded connection at valve body 1 side opening place, is connected with Adjusting ring 5 on valve body 1, and Adjusting ring 5 can regulate by positioning screwn 10, and then the performance parameter such as the Overpressure of a safety valve of regulation safety valve and Reseating pressure of a safety valve.
Adjust screw 8 and be arranged on cover plate 6 by screw thread, locking nut 12 is arranged on the upper end of adjusting screw 8 by screw thread, for locking, adjusts screw 8.Adjust screw 8, by thrust washer 11, bearing 13 and upper spring seat 14, power is conducted to spring 9, thereby can regulate Set pressure.As shown in Figure 2, O type circle 16 embeds in the groove of flap 2 and Disc holder 3 formations, is fixed on the disk body lower end of Disc holder 3 by hex screw 15, forms an assemblying body, and this assemblying body is pressed on the sealing surface of valve body 1 by spring 9.This assemblying body and valve body 1, the common main flow passage structure that forms safety valve of Adjusting ring 5.This flow passage structure has larger discharge capacity and good performance parameter, Overpressure of a safety valve≤10%, Blowdown of a safety valve≤5%.。
Spring 9 and upper spring seat 14 integral body are positioned at the cavity consisting of Disc holder 3, guide pin bushing 4 and cover plate 6, and spring 9 is directly installed on Disc holder 3, thereby significantly reduce the point of action of spring force, can meet the performance requirement of low pressure operating mode.
The material of described valve body 1, Disc holder 3, bonnet 7 is aluminium; The material of described O type circle 16 is fluorine rubber; The sealing surface of Disc holder 3 and valve body 1 all, through grinding, forms metal sealing; The sealing surface of O type circle 16 and valve body 1 forms nonmetal elastic packing, as shown in Figure 2.Metal sealing and nonmetal elastic packing form double seal jointly.
As shown in Figure 2 to 3, the double sealing structure of low pressure heavy caliber safety valve described in the utility model is when work:
In safety valve closed condition, nonmetal elastic packing plays primary seal effect, the medium of safety valve ingress can enter the groove at flap 2 places, system pressure is not only conducive to compress O type circle 16, also help the sealing surface that compresses Disc holder 3, the sealing force that increases the metal sealing that the sealing surface of itself and valve body 1 forms, therefore can realize zero leakage.
When safety valve is opened, as shown in Figure 3, savings is released by the groove at flap 2 places at the pressure at Disc holder 3, flap 2 and O type circle 16 places, thereby can avoid O type circle 16 because the pressure gathering is blown.When system pressure declines, Disc holder 3 drives O type circle 16 and 2 times seats of flap under spring 9 effects, in returning seat process, O type circle 16 is due to the metal spacing that has the metal sealing of the sealing surface of Disc holder 3 and valve body 1 to form, therefore can not be subject to larger impact and compression, thereby can there is longer working life, thereby can meet the seal request of low pressure operating mode.
Claims (8)
1. a low pressure heavy caliber safety valve, it is characterized in that: its agent structure consists of valve body (1), guide pin bushing (4), cover plate (6) and the bonnet (7) of valve seat valve body integral type, guide pin bushing (4) is connected in the middle of valve body (1) and cover plate (6), bonnet (7) is arranged on cover plate (6) above, in valve body (1) chamber, positioning screwn (10) is connected to valve body (1) side opening place, is connected with Adjusting ring (5) on valve body (1), and Adjusting ring (5) regulates by positioning screwn (10); O type circle (16) embeds in the groove of flap (2) and Disc holder (3) formation, by hex screw (15), be fixed on the disk body lower end of Disc holder (3), form an assemblying body, this assemblying body is pressed on the sealing surface of valve body (1) by spring (9), and this assemblying body and valve body (1), Adjusting ring (5) form the main flow passage structure of safety valve jointly; Spring (9) and upper spring seat (14) integral body are positioned at the cavity consisting of Disc holder (3), guide pin bushing (4) and cover plate (6), and spring (9) is directly installed on Disc holder (3); Adjusting screw (8) is arranged on cover plate (6), locking nut (12) is arranged on the upper end of adjusting screw (8), adjust screw (8), by thrust washer (11), bearing (13) and upper spring seat (14), power is conducted to spring (9), Set pressure is regulated; The sealing surface of Disc holder (3) and valve body (1) all, through grinding, forms metal sealing; The sealing surface of O type circle (16) and valve body (1) forms nonmetal elastic packing.
2. low pressure heavy caliber safety valve according to claim 1, it is characterized in that: the working procedure of described safety valve is as follows: in safety valve closed condition, nonmetal elastic packing plays primary seal effect, the medium of safety valve ingress can enter the groove that flap (2) is located, system pressure is conducive to compress O type circle (16), also help the sealing surface that compresses Disc holder (3), increase itself and the sealing force of the metal sealing of the sealing surface formation of valve body (1), realize zero leakage; When safety valve is opened, the groove that the pressure that savings is located at Disc holder (3), flap (2) and O type circle (16) is located by flap (2) is released, to avoid O type circle (16) because the pressure gathering is blown; When system pressure declines, Disc holder (3) drives O type circle (16) and flap (2) to return seat under spring (9) effect, return in seat process, O type circle (16), because of the metal spacing of the metal sealing formation of the sealing surface of Disc holder (3) and valve body (1), can not be subject to larger impact and compression.
3. low pressure heavy caliber safety valve according to claim 1 and 2, is characterized in that: the material of described valve body (1), Disc holder (3), bonnet (7) is aluminium; The material of described O type circle (16) is fluorine rubber.
4. low pressure heavy caliber safety valve according to claim 1 and 2, is characterized in that: described guide pin bushing (4) is bolted in the middle of valve body (1) and cover plate (6).
5. low pressure heavy caliber safety valve according to claim 1 and 2, is characterized in that: described bonnet (7) is arranged on cover plate (6) above by screw thread.
6. low pressure heavy caliber safety valve according to claim 1 and 2, is characterized in that: described positioning screwn (10) is threaded connection at valve body (1) side opening place.
7. low pressure heavy caliber safety valve according to claim 1 and 2, is characterized in that: described adjustment screw (8) is arranged on cover plate (6) by screw thread.
8. low pressure heavy caliber safety valve according to claim 1 and 2, is characterized in that: described locking nut (12) is arranged on the upper end of adjusting screw (8) by screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573135.8U CN203463741U (en) | 2013-09-16 | 2013-09-16 | Low-pressure large-diameter safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573135.8U CN203463741U (en) | 2013-09-16 | 2013-09-16 | Low-pressure large-diameter safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203463741U true CN203463741U (en) | 2014-03-05 |
Family
ID=50176108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320573135.8U Expired - Lifetime CN203463741U (en) | 2013-09-16 | 2013-09-16 | Low-pressure large-diameter safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203463741U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968113A (en) * | 2013-09-16 | 2014-08-06 | 北京航天动力研究所 | Low-pressure large-diameter safety valve |
| WO2023019979A1 (en) * | 2021-08-16 | 2023-02-23 | 北京航天石化技术装备工程有限公司 | Safety valve for low-temperature and low-pressure working condition |
-
2013
- 2013-09-16 CN CN201320573135.8U patent/CN203463741U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968113A (en) * | 2013-09-16 | 2014-08-06 | 北京航天动力研究所 | Low-pressure large-diameter safety valve |
| CN103968113B (en) * | 2013-09-16 | 2017-02-01 | 北京航天动力研究所 | Low-pressure large-diameter safety valve |
| WO2023019979A1 (en) * | 2021-08-16 | 2023-02-23 | 北京航天石化技术装备工程有限公司 | Safety valve for low-temperature and low-pressure working condition |
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