CN201615268U - Main steam security valve - Google Patents
Main steam security valve Download PDFInfo
- Publication number
- CN201615268U CN201615268U CN2010201501955U CN201020150195U CN201615268U CN 201615268 U CN201615268 U CN 201615268U CN 2010201501955 U CN2010201501955 U CN 2010201501955U CN 201020150195 U CN201020150195 U CN 201020150195U CN 201615268 U CN201615268 U CN 201615268U
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- China
- Prior art keywords
- valve
- backpressure regulation
- cover
- backpressure
- pressure
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model relates to a main steam security valve, which comprises a valve body, a valve seat arranged inside the valve body, a valve clack pressed on the valve seat and a valve rod connected with the valve clack; the valve clack and the valve seat can be arranged in a relatively opened/closed manner; a guide sleeve is arranged at the upper part of the valve body and sleeved outside the valve clack; the valve clack moves up and down in the guide sleeve along the direction of the axial line; a back-pressure regulating mechanism is arranged at the upper part of the guide sleeve and comprises a back-pressure regulating sleeve, a back-pressure sleeve and a back-pressure regulating screw; the back-pressure regulating sleeve moves up and down along the direction of the axial line; the back-pressure regulating screw is connected with the back-pressure sleeve through a thread; a clearance is formed between the back-pressure sleeve and the back-pressure regulating sleeve; the lower part of the back-pressure regulating sleeve is conical; the clearance is changed along with the adjustment of the back-pressure regulating sleeve; a hole is formed on the back-pressure sleeve; the back-pressure regulating screw is arranged at an outlet of the hole; and the size of the outlet of the hole can be adjusted through the back-pressure regulating screw. The shutoff pressure of the valve can be effectively regulated by arranging the back-pressure regulating mechanism and can meet the requirements of system operation.
Description
Technical field
The utility model 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, only depend on the adjusting of safety valve self, valve is carried out the requirement that open and close does not often reach system operation, to the hidden danger on the safety of causing of steam line.
Summary of the invention
The utility model provides a kind of main steam safety valve.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of main steam safety valve, comprise valve body, be arranged on the valve seat of described valve inner, be pressed in the flap on the described valve seat, the valve rod that is connected with described flap, described flap can be split mutually with described valve seat, the setting of closing, described valve body top is provided with guide sleeve, described guide sleeve is set in described flap outside, 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, described backpressure adjusting mechanism comprises the backpressure regulation cover that is set on the described valve rod, be set in the outside back pressure cover of described backpressure regulation cover, and backpressure regulation screw, described backpressure regulation cover can move up and down along its direction of axis line, described backpressure regulation screw and described back pressure cover are by being threaded
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 mutually with described valve rod.
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 utility model compared with prior art has following advantage: the utility model is by 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 utility model;
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 drawings and Examples the utility model is further described:
A kind of main steam safety valve as shown in Figure 1, comprise valve body 1, be arranged on valve body 1 inside valve seat 2, be pressed in the flap 4 on the valve seat 2, the valve rod 14 that is connected with flap 4, the setting that flap 4 and valve seat 2 can relative open and closes.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 by being threaded in the flap 4, and lower direction has certain activity space thereon, 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.
Guide sleeve 5 tops are provided with backpressure adjusting mechanism, backpressure adjusting mechanism comprises the backpressure regulation cover 7 that is threaded onto threadably on the valve rod 14, and turn up and down, be set in backpressure regulation and overlap the back pressure cover 8 and the backpressure regulation screw 11 of 7 outsides, backpressure regulation screw 11 and back pressure cover 8 is by being threaded, and can turn.
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 backspin 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 utility model down of setting forth:
Valve is adjusted screw rod 16 by downward adjusting and is come pressure spring 17, 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 enters second chamber 13 by hole 9 and gap 10, is drained into the outlet side of valve afterwards.
By 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 was subjected to 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 utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection domain of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection domain of the present utility model.
Claims (4)
1. main steam safety valve, comprise valve body, be arranged on the valve seat of described valve inner, be pressed in the flap on the described valve seat, the valve rod that is connected with described flap, described flap can be split mutually with described valve seat, the setting of closing, described valve body top is provided with guide sleeve, described guide sleeve is set in described flap outside, 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, described backpressure adjusting mechanism comprises the backpressure regulation cover that is set on the described valve rod, be set in the outside back pressure cover of described backpressure regulation cover, and backpressure regulation screw, described backpressure regulation cover can move up and down along its direction of axis line, described backpressure regulation screw and described back pressure cover are by being threaded
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.
2. main steam safety valve according to claim 1 is characterized in that: described backpressure regulation cover is threaded mutually with described valve rod.
3. main steam safety valve according to claim 1 is characterized in that: 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.
4. main steam safety valve according to claim 3 is characterized in that: described slip ring is provided with 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201501955U CN201615268U (en) | 2010-04-02 | 2010-04-02 | Main steam security valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201501955U CN201615268U (en) | 2010-04-02 | 2010-04-02 | Main steam security valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201615268U true CN201615268U (en) | 2010-10-27 |
Family
ID=43001637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201501955U Expired - Lifetime CN201615268U (en) | 2010-04-02 | 2010-04-02 | Main steam security valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201615268U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806371A (en) * | 2010-04-02 | 2010-08-18 | 吴江市东吴机械有限责任公司 | Main steam safety valve |
| CN105422881A (en) * | 2015-09-25 | 2016-03-23 | 上海发电设备成套设计研究院 | Valve clack of labyrinth type release valve |
-
2010
- 2010-04-02 CN CN2010201501955U patent/CN201615268U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806371A (en) * | 2010-04-02 | 2010-08-18 | 吴江市东吴机械有限责任公司 | Main steam safety valve |
| CN105422881A (en) * | 2015-09-25 | 2016-03-23 | 上海发电设备成套设计研究院 | Valve clack of labyrinth type release valve |
| CN105422881B (en) * | 2015-09-25 | 2018-04-20 | 上海发电设备成套设计研究院 | A kind of labyrinth type discharge valve flap |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101027 Effective date of abandoning: 20120125 |