CN101806371B - Main steam safety valve - Google Patents
Main steam safety valve Download PDFInfo
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- CN101806371B CN101806371B CN2010101389536A CN201010138953A CN101806371B CN 101806371 B CN101806371 B CN 101806371B CN 2010101389536 A CN2010101389536 A CN 2010101389536A CN 201010138953 A CN201010138953 A CN 201010138953A CN 101806371 B CN101806371 B CN 101806371B
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- valve
- back pressure
- backpressure regulation
- flap
- cover
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Abstract
The invention relates to a main steam safety valve, which comprises a valve body, a valve seat, a valve flap and a valve rod, wherein the valve seat is arranged inside the valve body, the valve flap is pressed on the valve seat, the valve rod is connected with the valve flap, the valve flap and the valve seat are in the arrangement capable of being correspondingly opened or closed, a guide sleeve is arranged on the upper part of the valve body, the guide sleeve is sheathed outside the valve flap, the valve flap moves up and down in the direction along the axial lead of the guide sleeve in the guide sleeve, the upper part of the guide sleeve is provided with a back pressure regulation mechanism which comprises a back pressure regulation sleeve, a back pressure sleeve and a back pressure regulation screw, the back pressure regulation sleeve moves up and down in the direction along the axial lead of the back pressure regulation sleeve, the back pressure regulation screw is connected with the back pressure sleeve through screw threads, a gap is formed between the back pressure sleeve and the back pressure regulation sleeve, the lower part of the back pressure regulation sleeve is in a conical shape, the gap can be changed along with the regulation of the back pressure regulation sleeve, a hole is formed on the back pressure sleeve, the back pressure regulation screw is arranged at an outlet of the hole, and the back pressure regulation screw can regulate the size of the outlet of the hole. Through the arrangement of the back pressure regulation mechanism, the closing pressure of the valve can be effectively regulated, so the closing pressure of the valve can reach the system operation requirements.
Description
Technical field
The present invention relates to a kind of main steam safety valve.
Background technique
Main steam safety valve is mainly used in the protection main steam line.When ducted medium (saturated vapour) pressure was elevated to the cracking pressure (Set pressure) of safety valve, valve was opened automatically, discharges ducted medium, made the pressure of pipeline descend, and the protection pipeline is unlikely to owing to the unlimited rising of pressure medium is exploded.When ducted pressure was reduced to the closing pressure of safety valve, valve was closed automatically, made that medium no longer continues to discharge, thereby guaranteed that normal activity in production is unaffected.
Yet the adjusting of only leaning on safety valve self is carried out the requirement that open and close does not often reach system's operation to valve, to the hidden danger on the safety that causes of steam line.
Summary of the invention
The object of the invention provides a kind of main steam safety valve.
For achieving the above object, the technological scheme that the present invention adopts is:
A kind of main steam safety valve; Comprise valve body, be arranged on described valve inner valve seat, be pressed in the flap on the described valve seat, the valve rod that is connected with described flap; The setting of open and close relatively of described flap and described valve seat, described valve body top is provided with guide sleeve, and it is outside that described guide sleeve is set in described flap; Described flap moves up and down along its direction of axis line in described guide sleeve; Described guide sleeve top is provided with backpressure adjusting mechanism, and described backpressure adjusting mechanism comprises the backpressure regulation cover that is set on the described valve rod, back pressure cover and the backpressure regulation screw that is set in described backpressure regulation cover outside, and described backpressure regulation cover can move up and down along its direction of axis line; Described backpressure regulation screw overlaps through being threaded with described back pressure
Have the gap between the inner peripheral surface of described back pressure cover and the described backpressure regulation cover outer circumferential face, the bottom of described backpressure regulation cover is the taper that radius diminishes gradually, when the described backpressure regulation cover of downward adjusting, described gap smaller; When to the described backpressure regulation cover of adjusted; It is big that described gap becomes, and described back pressure puts to be offered porosely, and described backpressure regulation screw is arranged on the outlet port in described hole; When the described backpressure regulation screw of rotation, the outlet in described hole is sealed or is opened by described backpressure regulation screw.
Technique scheme can be preferably, and described backpressure regulation cover is threaded with described valve rod mutually.
Technique scheme can preferably be arranged with at least one slip ring on the outer circumferential face of described backpressure regulation cover, and described slip ring can moving radially along described backpressure regulation cover.Further preferably, described slip ring is provided with 2.
Because the technique scheme utilization, the present invention compared with prior art has advantage and effect: the present invention is through being provided with backpressure adjusting mechanism, and effectively the closing pressure of regulating valve makes the closing pressure of valve reach the requirement of system's operation.
Description of drawings
Accompanying drawing 1 is a structural representation of the present invention;
Accompanying drawing 2 is an A place enlarged view in the accompanying drawing 1.
Wherein: 1, valve body; 2, valve seat; 3, following Adjusting ring; 4, flap; 5, guide sleeve; 6, raise pitch circle; 7, backpressure regulation cover; 8, back pressure cover; 9, hole; 10, gap; 11, backpressure regulation screw; 12, first chamber; 13, second chamber; 14, valve rod; 15, slip ring; 16, screw rod; 17, spring; 18, the 3rd chamber.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
A kind of main steam safety valve as shown in Figure 1 comprises valve body 1, is arranged on the inner valve seat 2 of valve body 1, is pressed in the flap 4 on the valve seat 2, the valve rod 14 that is connected with flap 4, flap 4 and valve seat 2 setting of open and close relatively.Valve seat 2 be welded as a whole after valve body 1 is threaded mutually, be rotary with down Adjusting ring 3 above the valve seat 2, and turn up and down.Valve rod 14 is through being threaded in the flap 4, and lower direction has certain activity space above that, and valve rod 14 head globulates contact with the inclined-plane of flap 4, and the active force that is beneficial to valve rod 14 acts on the center of flap 4 all the time.Valve body 1 top is provided with guide sleeve 5, and guide sleeve 5 is set in flap 4 outsides, and flap 4 moves up and down along its direction of axis line in guide sleeve 5.Be rotary with above the guide sleeve 5 and raise pitch circle 6 and turn up and down.
The inner peripheral surface of back pressure cover 8 and backpressure regulation are overlapped and are had gap 10 between 7 outer circumferential faces, and the bottom of backpressure regulation cover 7 is the taper that radius diminishes gradually, and when overlapping 7 to the underspin backpressure regulation, gap 10 diminishes; When upwards revolving backpressure regulation cover 7, gap 10 becomes big.Offer porosely 9 on the back pressure cover 8, backpressure regulation screw 11 is arranged on the outlet port in hole 9, and when rotation backpressure regulation screw 11, the outlet in hole 9 is by 11 sealings of backpressure regulation screw or open.
As shown in Figure 2, sheathed 2 slip rings 15 on the outer circumferential face of backpressure regulation cover 11, slip ring 15 can overlap 7 move radially along backpressure regulation.Slip ring is used to prevent owing to the valve rod distortion causes friction, thereby causes increasing of valve opening pressure.Slip ring 15 overlaps 7 close-fittings with backpressure regulation, prevents that medium from flowing out from the gap.
Below the concrete operating method of the present invention down of setting forth:
Valve comes pressure spring 17 through downward adjusting adjustment screw rod 16, produces spring force and acts on the valve rod 14, is delivered on the flap 4 again, forms a downward sealing force.
When protected ducted pressure is lower than the cracking pressure of valve, the pressure on the flap 4 that spring force acts on greater than medium, medium is closed in the 3rd chamber 18, can not discharge.
When protected ducted pressure rose to the cracking pressure of valve, spring force equaled medium power, and this moment, flap 4 still was in original position, and medium still is closed in the 3rd chamber 18.
Rise when ducted pressure continuation, the power that acts on the flap 4 surpasses spring force, valve opening, and flap 4 upwards rises.Because after flap 4 rose, medium leaked, and acts on the lower plane 4 of whole flap 4.Owing to the power that valve opening causes spring 17 compressions to be produced has been offset in the increase of lifting surface area.Bump against back pressure up to flap 4 and overlap 8 lower plane, this moment, flap 4 stopped to rise, and valve reaches full open.
In valve opening, the medium that discharges enters into first chamber 12, medium the pressure of first chamber 12 act on flap 4 on the plane, be used to help valve closing.
The medium of first chamber 12 gets into second chamber 13 through hole 9 and gap 10, is drained into the outlet side of valve afterwards.
Through the size that the upper-lower position of regulating backpressure regulation cover 7 is regulated gap 10,, can also regulate backpressure regulation screw 11 and come the path size of control hole 9 to regulate the pressure of first chamber 12 in order to control the pressure medium in first chamber 12.
When ducted pressure dropped to the closing pressure of valve, flap 4 received following medium power less than spring force and the medium power above the flap 4, and flap 4 moves down, valve closing.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. main steam safety valve; Comprise valve body, be arranged on described valve inner valve seat, be pressed in the flap on the described valve seat, the valve rod that is connected with described flap; The setting of open and close relatively of described flap and described valve seat, described valve body top is provided with guide sleeve, and it is outside that described guide sleeve is set in described flap; Described flap moves up and down along its direction of axis line in described guide sleeve; It is characterized in that: described guide sleeve top is provided with backpressure adjusting mechanism, and described backpressure adjusting mechanism comprises the backpressure regulation cover that is set on the described valve rod, back pressure cover and the backpressure regulation screw that is set in described backpressure regulation cover outside, and described backpressure regulation cover can move up and down along its direction of axis line; Described backpressure regulation screw overlaps through being threaded with described back pressure
Have the gap between the inner peripheral surface of described back pressure cover and the described backpressure regulation cover outer circumferential face, the bottom of described backpressure regulation cover is the taper that radius diminishes gradually, when the described backpressure regulation cover of downward adjusting, described gap smaller; When to the described backpressure regulation cover of adjusted, it is big that described gap becomes, described back pressure put offer porose; Described backpressure regulation screw is arranged on the outlet port in described hole; When the described backpressure regulation screw of rotation, the outlet in described hole is sealed or is opened by described backpressure regulation screw
Be arranged with at least one slip ring on the outer circumferential face of described backpressure regulation cover, described slip ring can moving radially along described backpressure regulation cover.
2. main steam safety valve according to claim 1 is characterized in that: described backpressure regulation cover is threaded with described valve rod mutually.
3. main steam safety valve according to claim 1 is characterized in that: described slip ring is provided with 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101389536A CN101806371B (en) | 2010-04-02 | 2010-04-02 | Main steam safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101389536A CN101806371B (en) | 2010-04-02 | 2010-04-02 | Main steam safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101806371A CN101806371A (en) | 2010-08-18 |
| CN101806371B true CN101806371B (en) | 2012-01-25 |
Family
ID=42608279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101389536A Active CN101806371B (en) | 2010-04-02 | 2010-04-02 | Main steam safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101806371B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889585A (en) * | 2016-06-08 | 2016-08-24 | 哈电集团哈尔滨电站阀门有限公司 | Novel full-bore type safety valve |
| CN111734858B (en) * | 2020-08-10 | 2022-03-25 | 罗浮阀门集团有限公司 | Ultrahigh-performance steam safety valve |
| CN112324961A (en) * | 2020-11-05 | 2021-02-05 | 吴江市东吴机械有限责任公司 | Safety valve with seat returning adjusting function |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2048925U (en) * | 1989-05-30 | 1989-12-06 | 吴汝昌 | Spring safe valve for steam boiler |
| JP3977561B2 (en) * | 1999-10-29 | 2007-09-19 | 株式会社東芝 | Main steam relief safety valve |
| JP4294968B2 (en) * | 2003-02-14 | 2009-07-15 | 川重冷熱工業株式会社 | High precision safety valve |
| CN201373149Y (en) * | 2009-03-06 | 2009-12-30 | 吴江市东吴机械有限责任公司 | Main steam safety valve |
| CN201615268U (en) * | 2010-04-02 | 2010-10-27 | 吴江市东吴机械有限责任公司 | Main steam security valve |
-
2010
- 2010-04-02 CN CN2010101389536A patent/CN101806371B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101806371A (en) | 2010-08-18 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Haizhuang Inventor after: Jiang Jianguo Inventor after: Zhu Qiuhong Inventor after: Ze Jiee Inventor after: Wang Wei Inventor after: Ze Xiaofeng Inventor after: Yu Xinhai Inventor after: Zhou Zhangrong Inventor after: Pan Weiwen Inventor after: Zhu Huifang Inventor after: Tao Xumin Inventor after: Chen Qiang Inventor after: Jiang Xiuli Inventor before: Wang Haizhuang Inventor before: Zhu Qiuhong Inventor before: Ze Jiee Inventor before: Wang Wei Inventor before: Ze Xiaofeng Inventor before: Zhou Zhangrong Inventor before: Pan Weiwen Inventor before: Zhu Huifang Inventor before: Tao Xumin Inventor before: Chen Qiang Inventor before: Jiang Xiuli Inventor before: Jiang Jianguo |
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| COR | Change of bibliographic data |