CN202674511U - Multistage pressure reducing control valve for high pressure heater emergency drainage - Google Patents
Multistage pressure reducing control valve for high pressure heater emergency drainage Download PDFInfo
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- CN202674511U CN202674511U CN 201220200560 CN201220200560U CN202674511U CN 202674511 U CN202674511 U CN 202674511U CN 201220200560 CN201220200560 CN 201220200560 CN 201220200560 U CN201220200560 U CN 201220200560U CN 202674511 U CN202674511 U CN 202674511U
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- valve
- multistage
- pressure reducing
- multistage pressure
- high pressure
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Abstract
The utility model discloses a multistage pressure reducing control valve for high pressure heater emergency drainage. The multistage pressure-reducing control valve for the high pressure heater emergency drainage comprises a valve body, a valve seat, a valve clack, a valve rod and a valve cover, wherein the valve cover is fixed at the upper end of the valve body, the valve seat is arranged in the valve body, a valve rod hole is arranged on the valve cover, the valve rod is arranged in the valve rod hole, and the lower end of the valve rod is connected with the valve clack. The multistage pressure reducing control valve for the high pressure heater emergency drainage is characterized in that a multistage pressure reducing component is arranged on the valve seat, the multistage pressure reducing component is composed of a plurality of layers of rectifier plates, orifices are arranged on each layer of rectifier plates, a lower cage cover and an upper cage cover are arranged at the upper end of the multistage pressure reducing component, and the valve clack is located inside the multistage pressure reducing component. According to the multistage pressure reducing control valve for the high pressure heater emergency drainage, the problem that a sealing face is washed and cavitated by mediums is resolved by pressure reducing layer by layer during the running process of a high pressure heater emergency drainage control valve, and safe running of an automatic control system is ensured to the maximum.
Description
Technical field
The utility model relates to a kind of valve; specifically a kind of be applicable to the fired power generating unit steam turbine high the protection of low-pressure heater use; when a variety of causes such as high low pressure heater booster cause that water level rises suddenly in the container, open fast this valve and add the emergent drain multistage pressure-reducing regulation valve with the height that protection height adds with the safety of steam turbine.
Background technique
The modulating valve control technique is the important component part that modern automation is produced, and is the key that indicates the automatic control level of a country, also is the important do-part of modernization industry, electric power, pharmacy, environmental protection.The running state of modern automation control system is decided by the quality of modulating valve greatly.The modulating valve sealability more has influence on the safe and reliable of automation control system.
Existing valve mechanism is comprised of following several primary clusterings as shown in Figure 3: valve body, valve seat, shroud, valve rod, valve gap etc. form.
Valve rod 8 adopts the tapering location with flap 7, is threaded, and locating stud is fixed, and puts into successively filler cover 10, filler 11, filler pressing sleeve 12 in valve gap 9 stuffing boxes, hold-down grid 13, and pretension hold-down grid bolt compresses filler, guarantees packing seal.
Valve rod 8 is connected with actuator, and under the driving of actuator, valve rod 8 drives flaps 7 and lifts off a seat 3, and lower 4 the window of shrouding is opened, and by changing the flow area of valve, flow is regulated.
Traditional HP heater drainage is to adopt single-stage to shroud decompression to realize adjusting to pressure medium and flow with regulating valve structure promptly.When high-pressure liquid is flowed through single-stage when shrouding, because flow area dwindles, flow velocity increases (and the increase of flow velocity must exchange for the corresponding reduction of pressure (or potential energy)), when this pressure P
1Be down to the vapor pressure P of feed-water intake temperature
VThe time, the feedwater gasification also forms bubble, and the formation of bubble can further make the pressure decreased at necked-down section place to the pressure that is lower than the fluid gasification.
After flow was crossed single-stage and shrouded, flow area increased, and pressure gos up, and when this pressure P 2 was equal to or higher than pressure for vaporization, bubble broke, and Here it is " flash distillation "
When bubble breaks, discharge huge energy, valve seat, spool and orifice union are produced very large destruction.The collapsing force of cavitation is very large, and valve has just lost the function of regulating control fully in a short period of time.
" flash distillation " and " cavitation " of flowing medium are the physical phenomenons that a kind of flow morphology changes, and the factor that forms this phenomenon is pressure reduction, if P1-△ is P＞P
VThe time, then fluid flash distillation and cavitation phenomenon can not occur.
In sum, how to reduce △ P, namely a step-down may occur flash distillation pressure reduction, classification is processed, and namely adopts the method for multistage throttle step-down, prevents the generation of " cavitation ".
Along with improving constantly that the automation control system safety and reliability is required, the requirement of the reliability of the performance element-modulating valve of automation control system is also being improved constantly.The technology of modulating valve also belongs to the primary stage at home, and a lot of problems of sealing technique aspect are not resolved, and run, drip, leak are the hang-ups of puzzlement automation control system always, to system control pollute, waste and harmful effect.(if valuable dielectric leakage meeting economic loss, poisonous and dangerous, volatile dielectric leakage can pollute or major accident).
The modernization control system generally is continuous operation, reliability and life requirements to modulating valve are higher, the inefficacy of modulating valve comprises controls malfunctioning and seal failure two large classes, as one of seal failure, valve core sealed cover do not press tightly all the time valve body sealing surface, velocity of medium too fast trim and sealing surface are produced to wash away etc. to cause leak in the sealing, affect the safe operation of fired power generating unit unit, cause very large economic waste.
The model utility content
Technical problem to be solved in the utility model is the deficiency that exists for above-mentioned prior art, and provide a kind of medium that effectively prevents to the washing away and cavitation of sealing surface, can guarantee to greatest extent that the height of the safe operation of automation control system adds the emergent drain multistage pressure-reducing regulation valve.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of high emergent drain multistage pressure-reducing regulation valve that adds, comprise valve body, valve seat, flap, valve rod and valve gap, described valve gap is fixed on the upper end of valve body, described valve seat is set in valve body, be provided with a valve rod hole at described valve gap, described valve rod is arranged in the described valve rod hole, the lower end of valve rod connects described flap, it is characterized in that: be provided with the multi-step pressure reduction assembly at described valve seat, this multi-step pressure reduction assembly is made of the multilayer Rectifier plate, be provided with throttle orifice at described every layer of Rectifier plate, shroud and shroud under the upper end of multi-step pressure reduction assembly arranges, described flap is positioned at described multi-step pressure reduction component internal.
Between described adjacent two Rectifier plates, be provided with the fluid passage.
Described Rectifier plate is 3～10 layers.
The utility model adopts the multilayer decompression member to become the integral core bag through special processing, utilizes the aperture on each Rectifier plate, shrinks when allowing medium pass through aperture, expands, and makes pressure decreased.MEDIA FLOW in the process of core bag through Rectifier plate layer by layer, variation has occured in flow velocity, has consumed a large amount of energy, pressure decreased.
By the layer by layer continuous step-down of orifice plate, hydrodynamic pressure maintains vapor pressure P all the time
VOn, thereby avoided the generation of cavitating.
This valve adopts reverse fluidised form, be that fluid enters decompression member from the valve seat upside, parallel with spool, upper strata by the core bag flows to lower floor again, so both had character of changing of resistence, avoid again the high pressure drop to act directly on the sealing surface of seat, eliminated the phenomenon that sealing surface of seat may cause wire drawing and cavitation erosion, improved the valve reliability of operation.
Because the variable choked flow attitude of liquid and axial fluidised form combine, make the low lift ratio high lift of spool more can distribute high pressure drop.When the spool lift was hanged down, the large flow of pressure drop was less, and along with the spool lift uprises, flow increases gradually.
By the design to key elements such as the hole diameter of each disc, quantity, the core bag that the multi-disc orifice plate forms has just embodied certain inherent flow characteristic, and disc itself also is a baffler simultaneously, makes valve have the characteristic of noise-reducing.
Beneficial effect
This structure can effectively solve the high emergency steam trap adjusting valve that adds in when operation, by layer by layer decompression, prevents that effectively medium to the washing away and cavitation of sealing surface, can guarantee the safe operation of automation control system to greatest extent.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model multi-step pressure reduction modular construction schematic diagram.
Fig. 3 is existing regulating valve structure schematic diagram.
Wherein: 1. valve body, 2. pad, 3. valve seat 4. shrouds down, shrouds 6. seal ring, 7. flap, 8. valve rod, 9. valve gap, 10. filler cover, 11. fillers, 12. filler pressing sleeves, 13. hold-down grids, 14. multi-step pressure reduction assemblies on 5..
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated,
As shown in Figure 1 and Figure 2, the valve seat 3 of the utility model modulating valve is installed in valve body 1 inner stopper, 1 of valve seat 3 and valve body are installed gasket seal 2, multi-step pressure reduction assembly 14 is installed on the valve seat 3, under shroud 4 and on shroud 5 and place the balanced seal circles, valve gap 9 compresses and shrouds 5, and valve body 1 is with bolts with valve gap 9.
Valve rod 8 adopts the tapering location with flap 7, is threaded, and locating stud is fixed, and puts into successively filler cover 10, filler 11, filler pressing sleeve 12 in valve gap 9 stuffing boxes, hold-down grid 13, and pretension hold-down grid bolt compresses filler, guarantees packing seal.
Valve rod 9 is connected with actuator, and under the driving of actuator, valve rod 9 drives flaps 7 and lifts off a seat 3, and medium enters multi-step pressure reduction assembly 14 from shrouding down 4 window, realizes multi-step pressure reduction, by changing the flow area of valve, flow is regulated.
Traditional height adds emergency steam trap adjusting valve and adopts single-stage to shroud pressure reduction structure, MEDIA FLOW is to many employings forward, when MEDIA FLOW out-of-date, because effective decompression that single-stage is shrouded is poor less, medium more easily produces the valve internals and washes away and cavitation, cause sealing surface to damage and trim destruction, affected the operation of valve working life and unit.
This structure is to change multistage throttle orifice plate design into original single-stage pressure reducing is shrouded; adopt the principle of multilevel decompression; utilize a plurality of disk restricting orifices to carry out step pressure reducing; make pressure medium maintain all the time more than the pressure for vaporization; thereby cavitation and the generation of washing away have been avoided; improve valve working life and degree of regulation, guaranteed effective operation of unit.
Claims (3)
1. one kind high adds the emergent drain multistage pressure-reducing regulation valve, comprise valve body, valve seat, flap, valve rod and valve gap, described valve gap is fixed on the upper end of valve body, described valve seat is set in valve body, be provided with a valve rod hole at described valve gap, described valve rod is arranged in the described valve rod hole, the lower end of valve rod connects described flap, it is characterized in that: be provided with the multi-step pressure reduction assembly at described valve seat, this multi-step pressure reduction assembly is made of the multilayer Rectifier plate, be provided with throttle orifice at described every layer of Rectifier plate, shroud and shroud under the upper end of multi-step pressure reduction assembly arranges, described flap is positioned at described multi-step pressure reduction component internal.
2. a kind of high emergent drain multistage pressure-reducing regulation valve that adds according to claim 1 is characterized in that: be provided with the fluid passage between described adjacent two Rectifier plates.
3. a kind of high emergent drain multistage pressure-reducing regulation valve that adds according to claim 1 and 2, it is characterized in that: described Rectifier plate is 3～10 layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220200560 CN202674511U (en) | 2012-05-07 | 2012-05-07 | Multistage pressure reducing control valve for high pressure heater emergency drainage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220200560 CN202674511U (en) | 2012-05-07 | 2012-05-07 | Multistage pressure reducing control valve for high pressure heater emergency drainage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202674511U true CN202674511U (en) | 2013-01-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220200560 Expired - Fee Related CN202674511U (en) | 2012-05-07 | 2012-05-07 | Multistage pressure reducing control valve for high pressure heater emergency drainage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202674511U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108374900A (en) * | 2018-02-24 | 2018-08-07 | 江苏亿阀股份有限公司 | A kind of supercritical gas order of reactor adjusting pressure reducing valve |
-
2012
- 2012-05-07 CN CN 201220200560 patent/CN202674511U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108374900A (en) * | 2018-02-24 | 2018-08-07 | 江苏亿阀股份有限公司 | A kind of supercritical gas order of reactor adjusting pressure reducing valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130507 |