CN101440883A - Middle and low pressure safety valve - Google Patents
Middle and low pressure safety valve Download PDFInfo
- Publication number
- CN101440883A CN101440883A CNA2008101639981A CN200810163998A CN101440883A CN 101440883 A CN101440883 A CN 101440883A CN A2008101639981 A CNA2008101639981 A CN A2008101639981A CN 200810163998 A CN200810163998 A CN 200810163998A CN 101440883 A CN101440883 A CN 101440883A
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- valve rod
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Abstract
The invention relates to a middle-low pressure safety valve which mainly comprises a valve body, a valve seat, a valve rod, a valve cover and a valve clack; the valve seat is connected with the lower end of the valve body through screw thread; the valve cover is arranged on the upper part of the valve body; the valve cover and the valve body are sleeved with the valve rod; the lower end of the valve rod is provided with the valve clack; the valve rod is contacted with the valve clack; the valve seat is of a contracting-expanding nozzle type; a spring is arranged on the valve rod; a sealing surface is formed between the valve seat and the valve clack; the outside of the valve clack is connected with a recoiling disc through screw thread; a connecting part between the valve body and the valve cover is provided with a guide sleeve; and the middle part of the valve rod is sleeved in the guide sleeve and is in sliding fit with the guide sleeve. The middle-low pressure safety valve has the following advantages: the valve adopts a contracting-expanding nozzle type valve seat structure with special design; the contracting-expanding nozzle ensures that the safety valve has the dynamic pressure coefficient and lift force coefficient of flow speed of more than 2 and the discharge coefficient of between 0.8 and 0.9 in the critical flowing state; and reliable sealing of the sealing surface between the valve clack and the valve seat improves the specific pressure of sealing and realizes the aim of zero leakage of sealing.
Description
Technical field
The present invention relates generally to the pressure releasing means field of power industry, mainly is a kind of mesolow safety valve.
Background technique
Along with the energy-saving and emission-reduction of power industry with utilize the continuous development of the energy again, the mesolow high-performance safety valve HF1A system-pressure releasing means that the boiler of little tonnage is equipped with is more and more general.Because device is in drum and superheater overpressure protection work condition state, system pressure transfinites and all need to recover and starts and close, and also wants the safe operation of taking into account system and the loss of the control energy simultaneously at this.The R﹠D process of high-performance safety valve need be by a large amount of lift simulation test and full performance tests, and these tests need be finished in the test room of specialty.Domestic owing to lack a series of test conditions and the professional technique talent, domestic for many years automatic class valve rests on lower level always.So the automatic class valve on significant points also depends on import at present.Because mesolow high-performance safety valve HF1A system-pressure releasing means is in the bad working environments of superpressure high temperature, the life-span of valve is shorter in this operating mode, performance in the whole course of action of opening and closing is lower, the manufacture process requirement of key components and parts is than higher, and the cost performance of at present domestic abominable market competition and product perfect is all lower.
Summary of the invention
The present invention will solve the shortcoming of above-mentioned prior art, and a kind of low energy consumption is provided, performance index height, the mesolow safety valve that cost performance is high.
The present invention solves the technological scheme that its technical problem adopts: this mesolow safety valve, mainly comprise valve body, valve seat, valve rod, valve gap and flap are formed, valve seat is by being threaded in the lower end of valve body, valve gap is located at the top of valve body, run through in valve gap and the valve body and be provided with valve rod, the valve rod lower end is provided with flap, valve rod and flap are in contact with one another, described valve seat is the contraction and enlargement nozzle formula, valve rod is provided with spring, forms a sealing surface between valve seat and the flap, and flap is outer by the Disc holder that has been threaded, the joint of valve body and valve gap is provided with guide sleeve, and the middle part of valve rod is sleeved on to be in the guide sleeve and with it and is slidingly matched.
Reducing place of described valve seat is provided with the boosting ring.
Contact by steel ball between described valve rod and the flap.
Be provided with up and down two spring seats in the cavity of described valve gap, spring is contained in up and down between two spring seats, and valve gap is provided with Adjusting bolt Adjusting screw, and the lower end of Adjusting bolt Adjusting screw contacts with the spring seat of upper end.
Described valve body lower portion is provided with plug screw.
The effect that the present invention is useful is: adopt the contraction and enlargement nozzle valve seat construction of particular design, its cone angle is that 15 ° contraction and enlargement nozzle guarantees that under the critical flow state safety valve has greater than 2 flow velocity dynamic pressure coefficient lift coefficient with up to 0.8～0.9 Coefficient of discharge.Adopt the boosting ring and Disc holder combination that are provided with on valve seat and the flap, make full use of the variation of air-flow recoil and recoil angle, guarantee performance index such as the discharging of device keying and time seat.Realize that the safety valve discharge pressure is not higher than 1.03Ps, Reseating pressure of a safety valve is not less than 0.93Ps.Utilizing the whole valve rod of centering and force-bearing to add hardened steel ball again is connected with flap, make that the movable piece structure is simpler, reduce the frictional force of each link, guaranteed the self-alignment of flap and remedied form and position tolerance automatically, realized reliable static properties and stable dynamic performance index.The reliable sealing of the sealing surface of flap and valve seat improves seal pressure, realizes the purpose of sealing zero leakage.Adopted whole valve rod load and guiding, reduced the intermediate friction link, realized the open-shut device structure of air-flow backsurging principle making manufacturability be much improved that cost decreases by means of Disc holder, performance index are higher than standard.Reach zero leakage by its sealing of full performance test, the deviation of adjusting is lower than ± 2%Ps, and Blowdown of a safety valve is lower than 7%, and other performances refer to all comply with the national standard requirements.
Description of drawings
Fig. 1 is a main TV structure schematic representation of the present invention.
Description of reference numerals: valve body 1, valve rod 2, valve seat 3, flap 4, valve gap 5, spring 6, spring seat 7, guide sleeve 8, Disc holder 9, boosting ring 10, steel ball 11, Adjusting bolt Adjusting screw 12, plug screw 13.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
As shown in the figure, this mesolow safety valve, mainly comprise valve body 1, valve seat 3, valve rod 2, valve gap 5 and flap 4 compositions, valve seat 3 is by being threaded in the lower end of valve body 1, valve gap 5 is located at the top of valve body 1, runs through being provided with valve rod 2 in valve gap 5 and the valve body 1, and valve rod 2 lower ends are provided with flap 4, be in contact with one another by steel ball 11 between valve rod 2 and the flap 4, guaranteed the self-alignment of flap and remedied form and position tolerance automatically.Valve seat 3 is contraction and enlargement nozzle formula (cone angle is 15 °); valve seat 3 nozzles form the entrance cavity of a valve, are connected with protected pressure-bearing kind equipment, and valve body 1 is provided with guide sleeve 8 with the joint of valve gap 5; guide sleeve 8 is in valve rod 2 middle parts, and valve rod 2 can move by easy on and off in guide sleeve 8.Valve rod 2 is provided with spring 6, and spring 6 is contained in up and down in two spring seats 7, is contained on the valve rod 2.Valve gap 5 is provided with Adjusting bolt Adjusting screw 12, and the lower end of Adjusting bolt Adjusting screw 12 contacts with the spring seat of upper end 7.By turning Adjusting bolt Adjusting screw 12, can adjust the Set pressure cracking pressure of safety valve.Form a sealing surface between valve seat 3 and the flap 4, reducing place of contraction and enlargement nozzle formula valve seat 3 is provided with boosting ring 10.Flap 4 is outer by the Disc holder 9 that has been threaded, and has utilized aerodynamic principle.Boosting ring 10 utilizes worm structure can carry out upper and lower displacement and regulates, and adopts the active force of spring 6 to give flap 4 by valve rod 2 transmission.Valve body 1 bottom is provided with plug screw 13, can be used for getting rid of foul and ponding.
The whole valve rod 2 load transmission of structure of the present invention, good rigidly; Flap 4 has universal degrees of freedom in valve rod 2, the free centering of energy; Change traditional flap 4 move mode in guide sleeve 8, be designed to valve rod 2 and in guide sleeve 8, move, avoid flap 4 jam in guide sleeve 8, also reduce guide sleeve 8 length simultaneously, lowered cost; The structure that steel ball 11 and flap 4, valve rod 2 are freely felt relieved improves performance index; Disc holder 9 simple in structure and low-cost.Low specific pressure reliable sealing in the static index, low deviation is accurately opened; Low Blowdown of a safety valve in time returns seat in the dynamic indicator, has realized low cost and high-performance, the cost performance height.
In addition to the implementation, the present invention can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1, a kind of mesolow safety valve, mainly comprise valve body (1), valve seat (3), valve rod (2), valve gap (5) and flap (4) are formed, valve seat (3) is by being threaded in the lower end of valve body (1), valve gap (5) is located at the top of valve body (1), run through in valve gap (5) and the valve body (1) and be provided with valve rod (2), valve rod (2) lower end is provided with flap (4), valve rod (2) is in contact with one another with flap (4), it is characterized in that: described valve seat (3) is the contraction and enlargement nozzle formula, valve rod (2) is provided with spring (6), form a sealing surface between valve seat (3) and the flap (4), flap (4) is outer by the Disc holder that has been threaded (9), valve body (1) is provided with guide sleeve (8) with the joint of valve gap (5), and the middle part of valve rod (2) is sleeved on to be in the guide sleeve (8) and with it and is slidingly matched.
2, mesolow safety valve according to claim 1 is characterized in that: reducing place of described valve seat (3) is provided with boosting ring (10).
3, mesolow safety valve according to claim 1 is characterized in that: contact by steel ball (11) between described valve rod (2) and the flap (4).
4, mesolow safety valve according to claim 1, it is characterized in that: be provided with two spring seats (7) up and down in the cavity of described valve gap (5), spring (6) is contained in up and down between two spring seats (7), valve gap (5) is provided with Adjusting bolt Adjusting screw (12), and the lower end of Adjusting bolt Adjusting screw (12) contacts with the spring seat (7) of upper end.
5, mesolow safety valve according to claim 1 is characterized in that: described valve body (1) bottom is provided with plug screw (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101639981A CN101440883A (en) | 2008-12-30 | 2008-12-30 | Middle and low pressure safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101639981A CN101440883A (en) | 2008-12-30 | 2008-12-30 | Middle and low pressure safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101440883A true CN101440883A (en) | 2009-05-27 |
Family
ID=40725435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101639981A Pending CN101440883A (en) | 2008-12-30 | 2008-12-30 | Middle and low pressure safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101440883A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI502146B (en) * | 2013-01-17 | 2015-10-01 | ||
| 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 |
| CN106402442A (en) * | 2016-12-06 | 2017-02-15 | 无锡优耐特净化装备有限公司 | Low-lift spring-loaded safety valve |
| CN107202170A (en) * | 2017-07-07 | 2017-09-26 | 浙江天和阀门有限公司 | A kind of processing method of spring Fluorine-lined safety valve and its flap component and flap component |
| CN108692075A (en) * | 2018-06-29 | 2018-10-23 | 恒华阀门有限公司 | High-performance spring Fall lift safety valve |
| CN113007403A (en) * | 2021-03-05 | 2021-06-22 | 浙江大学 | Safety valve structure capable of preventing back seat from being locked based on circumferential discharge pressure relief and method thereof |
-
2008
- 2008-12-30 CN CNA2008101639981A patent/CN101440883A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI502146B (en) * | 2013-01-17 | 2015-10-01 | ||
| 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 |
| CN106402442A (en) * | 2016-12-06 | 2017-02-15 | 无锡优耐特净化装备有限公司 | Low-lift spring-loaded safety valve |
| CN107202170A (en) * | 2017-07-07 | 2017-09-26 | 浙江天和阀门有限公司 | A kind of processing method of spring Fluorine-lined safety valve and its flap component and flap component |
| CN107202170B (en) * | 2017-07-07 | 2023-06-23 | 浙江天和阀门有限公司 | Processing method of valve clack assembly of spring type fluorine-lined safety valve |
| CN108692075A (en) * | 2018-06-29 | 2018-10-23 | 恒华阀门有限公司 | High-performance spring Fall lift safety valve |
| CN113007403A (en) * | 2021-03-05 | 2021-06-22 | 浙江大学 | Safety valve structure capable of preventing back seat from being locked based on circumferential discharge pressure relief and method thereof |
| CN113007403B (en) * | 2021-03-05 | 2022-03-29 | 浙江大学 | Safety valve structure capable of preventing back seat from being locked based on circumferential discharge pressure relief and method thereof |
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| C06 | Publication | ||
| PB01 | Publication | ||
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Open date: 20090527 |