CN103267154A - Piston-and-spring combined-type double-constant-value safety valve - Google Patents
Piston-and-spring combined-type double-constant-value safety valve Download PDFInfo
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- CN103267154A CN103267154A CN2013102032233A CN201310203223A CN103267154A CN 103267154 A CN103267154 A CN 103267154A CN 2013102032233 A CN2013102032233 A CN 2013102032233A CN 201310203223 A CN201310203223 A CN 201310203223A CN 103267154 A CN103267154 A CN 103267154A
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Abstract
The invention relates to the technical field of valves for steam and water, in particular to a piston-and-spring combined-type double-constant-value safety valve. The piston-and-spring combined-type double-constant-value safety valve comprises a valve body and a spring pressure control device, and further comprises a piston pressure control device. The piston pressure control device is installed between the valve body and the spring pressure control device. A steam inlet is formed in the lower portion of the piston pressure control device. The steam inlet is connected with a steam inlet pipe through a main pipeline. A lever valve is arranged on the main pipeline. A protective constant-value valve is arranged at the front portion of the lever valve. A spring constant-value valve is arranged at the rear portion of the lever valve. The piston-and-spring combined-type double-constant-value safety valve is not only applicable to a device with a small steam-discharging amount, but also applicable to a device with a large steam-discharging amount, a constant-value experiment can be conducted without the requirement for operating the devices, and the piston-and-spring combined-type double-constant-value safety valve has the advantages of being reasonable in structure and stable in performance, and reducing experimental expenses.
Description
Technical field
The present invention relates to a kind of vapour, water valve technology field, specifically box-like pair of definite value safety valve of a kind of piston and cluster spring.
Background technique
Safety valve is for the valve that plays safety effect that prevents that pressure medium arranges above regulation numerical value in the equipment, is the vitals in the equipment such as steam turbine or boiler.The safety valve that uses in steam turbine or the boiler adopts spring pulse type safety valve more, this safety valve displacement Da Yi makes the main-piping pressure fluctuation excessive, and spring uses and easily spring failure to take place after a period of time and build-up of pressure is inaccurate, poor stability, its displacement is slow, is not suitable for big displacement equipment, when doing the definite value experiment before valve is enabled, essential operational outfit, the testing expenses height.
Summary of the invention
The present invention provides a kind of rational in infrastructure in order to overcome above-mentioned defective, and the safety valve of stable performance is not only applicable to float vapour amount, is applicable to the equipment of big displacement yet, need not operational outfit and just can do the definite value experiment, has reduced testing expenses.
The technical solution used in the present invention is: box-like pair of definite value safety valve of a kind of piston and cluster spring, comprise valve body and spring pressure control device, valve body is installed between steam inlet pipe and the steam releasing tube, valve body comprises valve rod, spool and valve seat, spool is arranged on valve pocket 8 tops, stem lower portion extend in the spool, the spring pressure control device is arranged on valve body top, valve rod top is stretched in the spring pressure control device, it is characterized in that: also comprise the piston pressure control device, the piston pressure control device comprises housing, piston and piston guide cover, and housing is pipe shape cover body, is arranged on valve body top; Piston guide is set on enclosure interior, and the piston guide cover is cylindrical, and the bottom of pipe arranges flange, and the piston guide cover is connected valve seat top by its flange, and the piston guide cover is placed in the outside of valve rod; Piston is circular ring, and piston is arranged between piston guide cover and the housing; Described spring pressure control device is arranged on the top of piston pressure control device, and the spring seat in the spring pressure control device is positioned at the top of piston, and valve rod top is passed piston pressure control device and spring pressure control device successively, and its upper end arranges handle; The housing of piston bottom is provided with steam inlet; steam inlet is connected with steam inlet pipe by total pipeline; total pipeline is provided with the lever valve; lever valve in front of the door portion be provided with the protection demand valve; lever valve behind the door portion be provided with the spring demand valve; spring demand valve and protection demand valve one end are communicated with total pipeline by pipeline respectively; the spring demand valve is communicated with by a branch pipe(tube) with the other end of protection demand valve; be connected with subtube on the branch pipe(tube); the other end of subtube is connected with the equipment of suppressing, and also is provided with switch valve on the total pipeline between protection demand valve and the steam inlet pipe.
Among the present invention, the cross section of valve rod lower end is cruciate cylinder, and the spool endoporus that is connected with valve rod is corresponding cross endoporus.
Among the present invention, be set to detachable the connection by movable joint between the steam inlet of total pipeline and housing.
The present invention is provided with the piston pressure control device on valve body top, piston pressure control device top arranges the spring pressure control device, can realize two definite value dischargings, to be applicable to the various pressure steam discharge states of equipment, when the equipment displacement reaches first definite value, the piston pressure control device is failure to actuate, and has only the spring pressure control device to use; When equipment pressure reaches second definite value need fast decompression steam discharge, the high pressure gas of steam inlet pipe is pushed lever valve open and is entered in the housing by steam inlet, the high pressure gas promotes piston and moves up, the spring seat that piston drives in the spring pressure control device simultaneously moves up, valve rod can move up fast, be equipment fast decompression steam discharge, use when being fit to the big displacement of equipment; When safety valve is done the definite value experiment; close switch valve; be not communicated with the steam inlet pipe of equipment; subtube is connected with the equipment of suppressing, and comes to do the definite value experiment for spring pressure control device or piston pressure control device by opening spring demand valve or protection demand valve respectively, can move steam turbine equipment like this and just can do the definite value experiment; reduce experimental expenses; and realize two definite values, and make the safety valve safety and reliability, improve Security and stability.When equipment moved, the lever valve leak can be closed switch valve, disconnected movable joint, and the lever valve is safeguarded, did not also influence the work of spring pressure control device.
Description of drawings
Fig. 1 is schematic representation of the present invention.
Embodiment
Now by reference to the accompanying drawings the present invention is further described, Fig. 1 is a kind of embodiment of the present invention, comprise valve body and spring pressure control device 7, valve body is installed between steam inlet pipe and the steam releasing tube, valve body comprises valve rod 1, spool 2 and valve seat 3, spool 2 is arranged on valve pocket 8 tops, valve rod 1 bottom extend in the spool 2, spring pressure control device 7 is arranged on valve body top, valve rod 1 top is stretched in the spring pressure control device 7, also comprises the piston pressure control device, and the piston pressure control device comprises housing 4, piston 5 and piston guide cover 6, housing 4 is pipe shape cover body, is arranged on valve body top; Piston guide cover 6 is arranged on housing 4 inside, and it is 6 cylindrical that piston guide is overlapped, and the bottom of pipe arranges flange, and piston guide cover 6 is connected valve seat 3 tops by its flange, and piston guide cover 6 is placed in the outside of valve rod 1; Piston 5 is circular ring, and piston 5 is arranged between piston guide cover 6 and the housing 4; Described spring pressure control device 7 is arranged on the top of piston pressure control device, and the spring seat in the spring pressure control device 7 is positioned at the top of piston 5, and valve rod 1 top is passed piston pressure control device and spring pressure control device 7 successively, and its upper end arranges handle; The housing 4 of piston 5 bottoms is provided with steam inlet; steam inlet is connected with steam inlet pipe by total pipeline 11; total pipeline 11 is provided with lever valve 14; be provided with protection demand valve 12 in lever valve 14 front portions; be provided with spring demand valve 13 at lever valve 14 rear portions; spring demand valve 13 and protection demand valve 12 1 ends are communicated with total pipeline 11 by pipeline respectively; spring demand valve 13 is communicated with by a branch pipe(tube) 15 with the other end of protection demand valve 12; be connected with subtube on the branch pipe(tube) 15; the other end of subtube is connected with the equipment of suppressing, and also is provided with switch valve 16 on the total pipeline 11 between protection demand valve 12 and the steam inlet pipe.
In the present embodiment, the cross section of valve rod 1 lower end is cruciate cylinder, and spool 2 endoporus that are connected with valve rod 1 are corresponding cross endoporus, and namely the cruciate cylinder of the cross endoporus of spool 2 and valve rod 1 is complementary, and valve rod 1 hypomere can move up and down along the endoporus of spool 2.Can drive valve rod 1 by handle when valve body of the present invention leaks vapour, valve rod 1 drives spool 2 spin finishings by crossing spline, makes spool 2 and valve pocket 8 mating faces tightly not leak vapour.The present invention can also be set to detachable the connection by movable joint between the steam inlet of total pipeline 11 and housing 4, in order to safeguard other component of lever valve 14 or total pipeline 11, and do not influence 7 work of spring pressure control device.
When the present invention need do the experiment of spring pressure definite value; close switch valve 16; protection demand valve 12 and lever valve 14; open spring demand valve 13; equipment is suppressed in unlatching; suppress the pressure fluid of equipment through subtube; branch pipe(tube) 15 enters total pipeline 11; enter housing 4 by steam inlet; pressure fluid is with piston 5 jack-up; spring seat in the piston 5 drive spring pressure control devices 7 moves up and compresses spring; so that the force value of detection springs pressure control device 7; and then carry out fine adjustment by the adjustment silk braid on Regulation spring seat top, thereby determine the first definite value force value of spring pressure control device 7.
When the present invention need do the experiment of piston pressure definite value; close switch valve 16, spring demand valve 13; open protection demand valve 12; equipment is suppressed in unlatching; the pressure fluid of suppressing equipment enters the total pipeline 11 of lever valve 14 bottoms through subtube, branch pipe(tube) 15; when pressure fluid reaches the second definite value force value; push lever valve 14 open and enter housing 4 through steam ports; pressure fluid with piston 5 together with spring pressure control device 7 jack-up, thereby detect and the second definite value force value of definite piston pressure control device.
The present invention is when equipment operation work, open switch valve 16, make lever valve 14 in running order, when the pressure of steam inlet pipe during greater than the force value of first definite value, be the force value of the pressure fluid in the steam inlet pipe during greater than the downforce of spring, pressure fluid is with valve rod 1 jack-up, and valve body is opened, pressure fluid enters steam releasing tube through valve body, is the equipment decompression.When the pressure of steam inlet pipe during greater than the force value of second definite value, pressure fluid in the steam inlet pipe is pushed lever valve 14 open through total pipeline 11 and is entered in the housing 4, jack-up piston 5 then makes progress, the spring pressure control device 7 that piston 5 drives its tops is fast moving upwards together, valve rod 1 moves on just can realizing fast, can realize the valve body fast decompression.Pressure in steam inlet pipe reduces, and spring pressure control device 7 or the piston pressure control device of action reset.
Among the present invention, safety valve valve pocket 8 is arranged in the valve body admission end, can be provided with leak detection sealing circular groove by valve pocket 8 sealing surfaces, and annular seal groove links to each other with valve pocket 8 circular grooves by the hole, and valve pocket 8 circular grooves link to each other with valve body leak detection material feeding mouth.
The present invention is when system stops transport, and the water of stamper can be by valve body hunt leak intake port, valve pocket 8 circular grooves, and via through holes enters sealing surface annular leak detection groove, carries out the hydrostatic test; When valve leak, can be with grinding paste by valve body hunt leak intake port, valve pocket 8 circular grooves, via through holes enters sealing surface annular leak detection groove, and valve core sealed cover is ground; When safety valve escape in service, can also reclaim leak vapour by the valve body intake port of hunting leak.
The present invention is not only applicable to float vapour amount, is applicable to the equipment of big displacement yet, need not operational outfit and just can do definite value experiment, has rational in infrastructurely, and stable performance reduces the characteristics of testing expenses.
Claims (3)
1. a piston and box-like pair of definite value safety valve of cluster spring, comprise valve body and spring pressure control device, valve body comprises valve rod, spool and valve seat, and spool is arranged on valve pocket 8 tops, and stem lower portion extend in the spool, the spring pressure control device is arranged on valve body top, valve rod top is stretched in the spring pressure control device, it is characterized in that: also comprise the piston pressure control device, the piston pressure control device comprises housing, piston and piston guide cover, housing is pipe shape cover body, is arranged on valve body top; Piston guide is set on enclosure interior, and the piston guide cover is cylindrical, and the bottom of pipe arranges flange, and the piston guide cover is connected valve seat top by its flange, and the piston guide cover is placed in the outside of valve rod; Piston is circular ring, and piston is arranged between piston guide cover and the housing; Described spring pressure control device is arranged on the top of piston pressure control device, and the spring seat in the spring pressure control device is positioned at the top of piston, and valve rod top is passed piston pressure control device and spring pressure control device successively, and its upper end arranges handle; The housing of piston bottom is provided with steam inlet; steam inlet is connected with steam inlet pipe by total pipeline; total pipeline is provided with the lever valve; lever valve in front of the door portion be provided with the protection demand valve; lever valve behind the door portion be provided with the spring demand valve; spring demand valve and protection demand valve one end are communicated with total pipeline by pipeline respectively; the spring demand valve is communicated with by a branch pipe(tube) with the other end of protection demand valve; be connected with subtube on the branch pipe(tube); the other end of subtube is connected with the equipment of suppressing, and also is provided with switch valve on the total pipeline between protection demand valve and the steam inlet pipe.
2. box-like pair of definite value safety valve of piston according to claim 1 and cluster spring, it is characterized in that: the cross section of valve rod lower end is cruciate cylinder, and the spool endoporus that is connected with valve rod is corresponding cross endoporus.
3. box-like pair of definite value safety valve of piston according to claim 1 and 2 and cluster spring is characterized in that: be set to detachable the connection by movable joint between the steam inlet of total pipeline and housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102032233A CN103267154A (en) | 2013-03-20 | 2013-05-28 | Piston-and-spring combined-type double-constant-value safety valve |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310089820 | 2013-03-20 | ||
| CN201310089820.8 | 2013-03-20 | ||
| CN2013102032233A CN103267154A (en) | 2013-03-20 | 2013-05-28 | Piston-and-spring combined-type double-constant-value safety valve |
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| Publication Number | Publication Date |
|---|---|
| CN103267154A true CN103267154A (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102032233A Pending CN103267154A (en) | 2013-03-20 | 2013-05-28 | Piston-and-spring combined-type double-constant-value safety valve |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB474253A (en) * | 1936-05-18 | 1937-10-28 | David Auld & Sons Ltd | Improvements in and relating to safety valves for steam boilers and the like |
| GB492878A (en) * | 1937-04-12 | 1938-09-28 | Knorr Bremse Ag | Improvements in or relating to high lift safety valves for steam boilers |
| CN2048925U (en) * | 1989-05-30 | 1989-12-06 | 吴汝昌 | Spring safe valve for steam boiler |
| CN2627311Y (en) * | 2003-07-28 | 2004-07-21 | 北京八达高技贸有限公司 | High temperature and high pressure spring safety valve |
| CN102052493A (en) * | 2009-11-10 | 2011-05-11 | 北京航天动力研究所 | Steam safety valve with backpressure regulating mechanism and elastic valve clack |
| CN203146950U (en) * | 2013-03-20 | 2013-08-21 | 潘健 | Piston-spring combined type double-constant-value safety valve |
-
2013
- 2013-05-28 CN CN2013102032233A patent/CN103267154A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB474253A (en) * | 1936-05-18 | 1937-10-28 | David Auld & Sons Ltd | Improvements in and relating to safety valves for steam boilers and the like |
| GB492878A (en) * | 1937-04-12 | 1938-09-28 | Knorr Bremse Ag | Improvements in or relating to high lift safety valves for steam boilers |
| CN2048925U (en) * | 1989-05-30 | 1989-12-06 | 吴汝昌 | Spring safe valve for steam boiler |
| CN2627311Y (en) * | 2003-07-28 | 2004-07-21 | 北京八达高技贸有限公司 | High temperature and high pressure spring safety valve |
| CN102052493A (en) * | 2009-11-10 | 2011-05-11 | 北京航天动力研究所 | Steam safety valve with backpressure regulating mechanism and elastic valve clack |
| CN203146950U (en) * | 2013-03-20 | 2013-08-21 | 潘健 | Piston-spring combined type double-constant-value safety valve |
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Application publication date: 20130828 |