CN108692075B - High-performance spring full-open type safety valve - Google Patents
High-performance spring full-open type safety valve Download PDFInfo
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- CN108692075B CN108692075B CN201810696670.XA CN201810696670A CN108692075B CN 108692075 B CN108692075 B CN 108692075B CN 201810696670 A CN201810696670 A CN 201810696670A CN 108692075 B CN108692075 B CN 108692075B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0413—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of closure plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0466—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with a special seating surface
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a high-performance spring full-open type safety valve. The valve mainly solves the problems that the valve seat pressure of the existing spring full-open type safety valve is difficult to reach more than 95%, the valve clack cannot reach the valve opening height rapidly, and the high performance stability is poor. The method is characterized in that: an air-gathering cavity (8) is formed between the air-gathering cover (7) and the disc (61), the diameter of the air-gathering cavity (8) is not smaller than 2 times of the inner diameter (B) of the straight hole of the nozzle of the valve seat (2), the height of the air-gathering cavity (8) is not smaller than 1.5 times of the valve opening height (H), and the diameter of the air exhaust hole (62) is not smaller than the valve opening height (H); the diameter of the valve cavity (11) is not smaller than 1.8 times of the inner diameter of the valve body outlet (12). The valve seat returning pressure can reach more than 95%, the valve clack can quickly reach the valve opening height, the high performance stability is good, the valve can avoid full performance test when leaving the factory, the cost is reduced, and the user requirement is met.
Description
Technical Field
The invention relates to a valve, in particular to a high-performance spring full-open type safety valve.
Background
The safety valve is an automatic valve, and is mainly used for controlling the internal pressure of boiler, pressure container and pipeline not to exceed defined value so as to prevent the equipment from being damaged or hurt people due to too high pressure. When the pressure (internal pressure) of the medium rises enough to overcome the pretightening force of the spring, the valve clack is automatically opened, the internal pressure of the medium is reduced by discharging, when the internal pressure is reduced to a specified value, the valve clack is automatically closed under the action of the spring force, and the medium stops discharging. The main performance parameters of the spring full-open type safety valve are the displacement and the valve back seat pressure, the displacement is determined by the caliber of a valve seat and the valve opening height, the valve opening height is usually larger than or equal to 1/4 of the throat diameter of the valve seat, the national standard does not have the requirement of detecting the displacement, the displacement standard of the valve is usually regulated to be 0.75 in the industry, and the displacement standard regulated by the American standard is regulated to be 0.85; the valve seat back pressure is determined by the spring rate (spring rate). In order to better coordinate the valve opening height and the valve seat returning pressure, the inventor develops a high-performance spring full-open type safety valve, and obtains the patent rights of China, and the patent numbers are as follows: CN201610180995.3, this high performance spring opens formula relief valve entirely, including valve body, disk seat, valve clack, spring and recoil dish, the hole of disk seat be the nozzle form, the nozzle mouth size A of disk seat exit be the 1.2 times of throat footpath B, the cone angle D of disk seat nozzle mouth is 55 ~ 60, recoil dish bottom and the distance C of the pressure release chamber bottom surface of valve body are 0.50 ~ 0.6 times of throat footpath B. The related dimension factors between the nozzle opening dimension A at the outlet of the valve seat and the throat diameter B are limited, the nozzle opening dimension A at the outlet of the valve seat is increased within a reasonable range, so that the medium pressure in the valve seat is slightly reduced at the outlet, and the valve seat returning pressure is relatively improved; the related dimension elements of the distance C between the bottom of the recoil disc and the bottom surface of the pressure relief cavity of the valve body and the throat diameter B reduce the recoil distance of the medium, can obtain larger recoil force of the medium, and enable the valve clack to quickly reach the opening height of the valve, and meanwhile, the cone angle D of the nozzle opening of the valve seat is limited to 55-60 degrees to reach the optimal angle range of the opening height of the valve. The adjusting ring is omitted, the spring stiffness is reduced, the valve seat returning pressure is improved, and the American standard specification can be met or exceeded.
The high-performance spring full-open type safety valve with the structure is suitable for a valve cover without a windowing structure, when the high-performance spring full-open type safety valve is in different specifications and different structures, the difference of the back seat pressure and the displacement coefficient stability is larger, especially when the valve cover is in a windowing structure with steam as a medium, the valve body design is very important, the size elements between the valve cavity and the inner diameter of the valve body outlet and between the outer diameter of the recoil disc and the inner diameter of the straight hole of the valve seat nozzle have larger influence on the back seat pressure and the valve opening height of the safety valve, the proportion of the size elements reaches reasonable values, and the high-performance requirement of the safety valve can be met, so that the existing high-performance spring full-open type safety valve has the following defects in actual use: 1. when the medium is steam, the national standard requires that the valve cover of the safety valve is of a windowing structure, and under the working condition with the windowing structure, the back pressure in the valve cover cavity is equal to zero, at the moment, the highest seat returning pressure of the high-performance spring full-open type safety valve can reach 93%, more than 95% is difficult to reach, and the requirement of a user cannot be met. 2. The correlation dimension elements between the valve cavity of the valve body and the valve body outlet drift diameter and between the outer diameter of the recoil disc and the inner diameter of the straight hole of the valve seat nozzle are not clear, so that the proportion of the dimension elements is unreasonable, the requirement of high performance of the valve is difficult to achieve, namely, the valve clack is difficult to achieve to reach the valve opening height rapidly, and the valve recoil seat pressure is difficult to reach more than 95%. 3. The size elements of the recoil disc are not specified, namely the size elements which are not specifically and clearly related to the size of the recoil disc and the opening structure of the lower end are not beneficial to improving the opening height of the valve, and the stability of the high performance of the valve is poor. 4. Because the associated size elements of the main parts are not clear, when the valve is shipped, a full-performance test is required to be carried out on each valve, and the cost of the full-performance test increases the cost of the valve.
Disclosure of Invention
In order to solve the problems that the valve seat back pressure of the existing spring full-open type safety valve is difficult to reach more than 95%, the valve clack cannot reach the valve opening height quickly and the high performance stability is poor, the invention provides the high-performance spring full-open type safety valve, which is characterized in that a gas collecting cavity is additionally arranged in a valve cavity of a valve body, and meanwhile, related dimension elements of the valve cavity of the valve body, the valve body outlet diameter and the inner diameter of a nozzle straight hole are arranged according to a certain proportion, and dimension element regulation is also made for a recoil disc, so that the valve seat back pressure can reach more than 95%, the valve clack can reach the valve opening height quickly and the high performance stability is better, full performance test can be avoided when the valve leaves a factory, the cost is reduced, and the user requirements are met.
The technical scheme of the invention is as follows: the high-performance spring full-open type safety valve comprises a valve body, a valve seat, a valve clack, a spring and a recoil disc, wherein a valve cavity is formed in the valve body, a valve body outlet is formed in one side of the valve body, an inner hole of the valve seat is in a nozzle shape, the valve seat is positioned at the bottom of the valve cavity, the valve seat extends upwards into the valve cavity, a guide sleeve is arranged at the upper part of the valve cavity, the recoil disc can slide up and down along the guide sleeve, a disc is arranged at the upper end of the guide sleeve, a gas collecting cover is arranged above the disc, a gas collecting cavity is formed between the gas collecting cover and the disc in a surrounding manner, a gas discharging hole is formed in the disc, the gas collecting cavity is communicated with the valve cavity through the gas discharging hole, the gas discharging hole corresponds to the upper end face of the recoil disc, the diameter of the gas collecting cavity is not less than 2 times the inner diameter B of a straight hole of the valve seat nozzle, the height of the gas collecting cavity is not less than 1.5 times the valve opening height H, and the diameter of the gas discharging hole is not less than the valve opening height H. The diameter of the valve cavity is not smaller than 1.8 times of the inner diameter of the outlet of the valve body.
The outlet at the lower end of the recoil disc is a conical surface with a bevel angle of 45 degrees from top to bottom, the maximum outer diameter of the recoil disc is not smaller than 1.7 times of the opening height H plus 5mm, and the height E of the conical surface is not smaller than the valve opening height H.
The lower end of the conical surface is provided with a straight opening.
The height of the straight opening is 2mm.
The number of the exhaust holes is 4 and the exhaust holes are uniformly distributed along the circumferential direction of the disc.
The inner diameter A of the end face of the nozzle opening at the outlet of the valve seat is 1.2 times of the inner diameter B of the straight hole of the nozzle, the cone angle D of the nozzle opening of the valve seat 2 is 55-60 degrees, and the distance C between the bottom of the recoil disc and the bottom surface of the valve cavity of the valve body is 0.50-0.6 times of the inner diameter B of the straight hole of the nozzle of the valve seat.
The invention has the following beneficial effects: due to the adoption of the technical scheme, the related size factors between the size A of the nozzle opening at the outlet of the valve seat and the throat diameter B are limited, the size A of the nozzle opening at the outlet of the valve seat is increased within a reasonable range, so that the pressure of medium in the valve seat is slightly reduced at the outlet, and the back seat pressure of the valve is relatively improved; compared with the background technology, the related dimension factor of the distance C between the bottom of the recoil disc and the bottom surface of the pressure relief cavity of the valve body and the throat diameter B relatively reduces the medium recoil distance, can obtain larger medium recoil force, enables the valve clack to quickly reach the valve opening height, and simultaneously limits the cone angle D of the valve seat nozzle opening to 55-60 degrees to reach the optimal angle range of the valve opening height. The invention cancels the adjusting ring in the background technology, and through multiple experiments, the spring rigidity is reduced, the valve seat back pressure is improved, and the invention has the characteristics of simple structure, low cost, reliable valve seat back pressure and large discharge capacity, and can reach or exceed the American standard regulation.
Drawings
Fig. 1 is a cross-sectional view of the structure of the present invention.
Fig. 2 is a structural sectional view of the recoil disk 5 of fig. 1.
Fig. 3 is a sectional view of the guide bush 6 in fig. 1.
In the figure, the valve body is 1-, the valve cavity is 11-, the valve body outlet is 12-, the valve seat is 2-, the valve clack is 3-, the spring is 4-, the recoil disc is 5-, the conical surface is 51-, the straight port is 52-, the guide sleeve is 6-, the disc is 61-, the exhaust hole is 62-, the gas collecting cover is 7-, and the gas collecting cavity is 8-.
A-nozzle opening size, B-inner diameter of the straight hole of the nozzle, distance between the bottom of the C-recoil disk and the bottom surface of the valve cavity, D-cone angle, H-valve opening height and E-cone surface height.
Description of the embodiments
The invention is further described below with reference to the accompanying drawings:
the high-performance spring full-open type safety valve is shown in figures 1-3 and comprises a valve body 1, a valve seat 2, a valve clack 3, a spring 4 and a recoil disc 5, wherein a valve cavity 11 is arranged in the valve body 1, a valve body outlet 12 is arranged on one side of the valve body 1, an inner hole of the valve seat 2 is in a nozzle shape, the valve seat 2 is positioned at the bottom of the valve cavity 11, the valve seat 2 stretches upwards into the valve cavity 11, a guide sleeve 6 is arranged at the upper part of the valve cavity 11, the upper part of the recoil disc 5 is positioned in the guide sleeve 6, the recoil disc 5 can slide up and down along the guide sleeve 6, a disc 61 is arranged at the upper end of the guide sleeve 6, a gas collecting cover 7 is arranged above the disc 61, a gas collecting cavity 8 is enclosed between the gas collecting cover 7 and the disc 61, a vent hole 62 is arranged on the disc 61, the gas collecting cavity 8 is communicated with the valve cavity 11 through the vent hole 62, the vent hole 62 corresponds to the upper end face of the recoil disc 5, the diameter of the gas collecting cavity 8 is not smaller than 2 times the inner diameter B of the nozzle straight hole of the valve seat 2, the height of the gas collecting cavity 8 is not smaller than 1.5 times the diameter of the valve opening height H, and the height of the valve is not smaller than the vent 62 opening height H; the diameter of the valve cavity 11 is not smaller than 1.8 times of the inner diameter of the valve body outlet 12. Due to the adoption of the technical scheme, the structure of the air-collecting cavity 8 is increased, back pressure is generated in the air-collecting cavity 8 when the valve is discharged, the rigidity of the spring 4 can be selected to be lower under the condition of back pressure, and the back seat pressure and the opening height of the valve are greatly improved. Meanwhile, the relevant size elements of the valve cavity 11 of the valve body 1, the drift diameter of the valve body outlet 12 and the inner diameter B of the nozzle straight hole are set according to a certain proportion, the size elements are specified for the recoil disc 5, the high-performance spring fully-opened safety valve can still keep the recoil pressure when different specifications and different structures are adopted, the recoil pressure of the valve can reach more than 95%, the valve clack 3 can quickly reach the valve opening height and high-performance stability, and the high-performance requirement of the safety valve can be met when the window-opened structure with steam is adopted as a medium. The valve leaves the factory without full performance test, which reduces the cost and satisfies the user demand.
The outlet of the lower end of the recoil disc 5 is a conical surface 51 with a bevel angle of 45 degrees from top to bottom, the maximum outer diameter of the recoil disc 5 is not smaller than 1.7 times of the opening height H plus 5mm, and the height E of the conical surface 51 is not smaller than the valve opening height H. The gas impulse can be maintained before the valve reaches the open height so that the valve can be opened quickly and reaches the open height.
The lower end of the conical surface 51 is provided with a straight opening 52. The recoil disc 5 is provided with a straight opening 52, so that the rigidity of the spring 4 is properly increased, the ratio between the valve cavity 11 and the valve body outlet 12 can be relatively reduced, namely the volume of the valve body 1 can be relatively reduced, and the recoil disc is suitable for the valve body outlet 12 with a larger caliber. The straight opening 52 can increase the impact force of gas, improve the opening height of the valve and is beneficial to the stability of high performance of the valve.
The height of the straight opening 52 is 2mm. The height of the straight port 52 may be determined based on the size of the valve body outlet 12.
The number of the exhaust holes 62 is 4 and the exhaust holes are uniformly distributed along the circumference of the disc 61. This structure can make the back pressure generated in the air-condensing chamber 8 act on the recoil disk 5 uniformly.
The inner diameter A of the end face of the nozzle opening at the outlet of the valve seat 2 is 1.2 times of the inner diameter B of the nozzle straight hole, the cone angle D of the nozzle opening of the valve seat 2 is 55-60 degrees, and the distance C between the bottom of the recoil disc 5 and the bottom surface of the valve cavity 11 of the valve body 1 is 0.50-0.6 times of the inner diameter B of the nozzle straight hole of the valve seat. The related dimension factor between the nozzle opening dimension A at the outlet of the valve seat 2 and the inner diameter B at the straight hole of the nozzle is limited, the nozzle opening dimension A at the outlet of the valve seat 2 is increased within a reasonable range, so that the medium pressure in the valve seat 2 is slightly reduced at the outlet, and the valve back seat pressure is relatively improved; the relevant dimension factors of the distance C between the bottom of the recoil disc 5 and the bottom surface of the valve cavity 11 and the inner diameter B at the straight hole of the valve seat nozzle reduce the medium recoil distance, can obtain larger medium recoil force, and enable the valve clack 3 to quickly reach the valve opening height, and meanwhile, the cone angle D of the valve seat 2 nozzle opening is limited to 55-60 degrees to reach the optimal angle range of the valve opening height.
Claims (6)
1. The utility model provides a high performance spring opens relief valve entirely, includes valve body (1), disk seat (2), valve clack (3), spring (4) and recoil dish (5), be equipped with valve pocket (11) in valve body (1), one side of valve body (1) is equipped with valve body export (12), the hole of disk seat (2) is the nozzle form, and disk seat (2) are located the bottom of valve pocket (11) and disk seat (2) upwards stretch into in valve pocket (11), and the upper portion of valve pocket (11) is equipped with uide bushing (6), and the upper portion of recoil dish (5) is located uide bushing (6) and recoil dish (5) can follow uide bushing (6) and slide from top to bottom, its characterized in that: the upper end of the guide sleeve (6) is provided with a disc (61), a gas collecting cover (7) is arranged above the disc (61), a gas collecting cavity (8) is formed between the gas collecting cover (7) and the disc (61), an exhaust hole (62) is formed in the disc (61), the gas collecting cavity (8) is communicated with the valve cavity (11) through the exhaust hole (62), the exhaust hole (62) corresponds to the upper end face of the recoil disc (5), the diameter of the gas collecting cavity (8) is not smaller than 2 times of the inner diameter (B) of a straight hole of a nozzle of the valve seat (2), the height of the gas collecting cavity (8) is not smaller than 1.5 times of the valve opening height (H), and the diameter of the exhaust hole (62) is not smaller than the valve opening height (H); the diameter of the valve cavity (11) is not smaller than 1.8 times of the inner diameter of the valve body outlet (12).
2. The high performance spring full open safety valve of claim 1, wherein: the outlet at the lower end of the recoil disc (5) is a conical surface (51) with a bevel angle of 45 degrees from top to bottom, the maximum outer diameter of the recoil disc (5) is not smaller than 1.7 times of the opening height (H) plus 5mm, and the height (E) of the conical surface (51) is not smaller than the valve opening height (H).
3. The high-performance spring full-open safety valve of claim 2, wherein: the lower end of the conical surface (51) is provided with a straight opening (52).
4. A high performance spring full open safety valve according to claim 3, wherein: the height of the straight opening (52) is 2mm.
5. The high performance spring full open safety valve of claim 1, 2, 3 or 4, wherein: the number of the exhaust holes (62) is 4 and the exhaust holes are uniformly distributed along the circumferential direction of the disc (61).
6. The high performance spring full open safety valve of claim 1, 2, 3 or 4, wherein: the inner diameter (A) of the end face of the nozzle opening at the outlet of the valve seat (2) is 1.2 times of the inner diameter (B) of the nozzle straight hole, the cone angle (D) of the nozzle opening of the valve seat (2) is 55-60 degrees, and the distance (C) between the bottom of the recoil disc (5) and the bottom surface of the valve cavity (11) of the valve body (1) is 0.50-0.6 times of the inner diameter (B) of the nozzle straight hole of the valve seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810696670.XA CN108692075B (en) | 2018-06-29 | 2018-06-29 | High-performance spring full-open type safety valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810696670.XA CN108692075B (en) | 2018-06-29 | 2018-06-29 | High-performance spring full-open type safety valve |
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| Publication Number | Publication Date |
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| CN108692075A CN108692075A (en) | 2018-10-23 |
| CN108692075B true CN108692075B (en) | 2023-07-25 |
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| CN201810696670.XA Active CN108692075B (en) | 2018-06-29 | 2018-06-29 | High-performance spring full-open type safety valve |
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| CN (1) | CN108692075B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109163126B (en) * | 2018-11-01 | 2024-06-28 | 恒华阀门有限公司 | High-performance high-temperature high-pressure safety valve |
| CN111442123A (en) * | 2020-05-14 | 2020-07-24 | 杭州华惠阀门有限公司 | Quick opening and closing safety valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215172546U (en) * | 2021-07-29 | 2021-12-14 | 立特阀门科技有限公司 | Spring full-open type safety valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101440883A (en) * | 2008-12-30 | 2009-05-27 | 杭州华惠阀门有限公司 | Middle and low pressure safety valve |
| KR101178901B1 (en) * | 2010-02-22 | 2012-08-31 | 주식회사 삼신 | Safety Relief Valve |
| CN105626918B (en) * | 2016-03-28 | 2017-11-14 | 恒华阀门有限公司 | High-performance spring Fall lift safety valve |
| CN106246938B (en) * | 2016-09-30 | 2018-06-29 | 王瑞卿 | Combine adjustable elastic sealing flap high temperature and pressure safety valve |
| CN208457280U (en) * | 2018-06-29 | 2019-02-01 | 恒华阀门有限公司 | High-performance spring Fall lift safety valve |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215172546U (en) * | 2021-07-29 | 2021-12-14 | 立特阀门科技有限公司 | Spring full-open type safety valve |
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