CN101625033B - Water supply control valve for high-pressure boiler - Google Patents
Water supply control valve for high-pressure boiler Download PDFInfo
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- CN101625033B CN101625033B CN2009101837084A CN200910183708A CN101625033B CN 101625033 B CN101625033 B CN 101625033B CN 2009101837084 A CN2009101837084 A CN 2009101837084A CN 200910183708 A CN200910183708 A CN 200910183708A CN 101625033 B CN101625033 B CN 101625033B
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- valve
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- water supply
- guide
- valve core
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Abstract
The invention relates to a water supply control valve for a high-pressure boiler, comprising a valve body, a valve cover, a valve rod and a valve inside part, wherein the valve inside part comprises a valve seat, a sleeve, a balance cylinder and a valve core component. The valve core component is fixed at the end part of the valve rod, a valve cavity, a valve inlet and a valve outlet are arranged on the valve body, the valve inlet and the valve outlet are communicated with the valve cavity, the valve inside part is assembled in the valve cavity, the valve core component comprises a pilot valve core provided with a small hole arranged on the side wall, a balancing spring and a main valve core provided with small holes arranged on the side wall and at the bottom, the main valve core is matched with the valve seat, the top of the pilot valve core is fixed on the valve rod, and the pilot valve core is sleeved in the main valve core in a matching way. The invention adopts a structure combining the pilot valve core and the main valve core, can realize water supply regulation between a large flow and a small flow, avoids the phenomenon of cavitation erosion in the small flow at the same time, has accurate valve regulation performance, and greatly prolongs the service life.
Description
Technical field
The present invention relates to a kind of water supply control valve for high-pressure boiler, be used for the Boiler High Pressure water supply system of industries such as power station, petrochemical industry, metallurgy, papermaking, do to control to water flow.
Background technique
The feed water system of boiler is general to adopt following dual mode to carry out to water management:
First kind of mode adopts single feed valve system.Have only a modulating valve to come, select cage type single seat regulating valve usually for use to boiler water supply.When this valve runs well at boiler operating pressure differential less (about 1～2.5MPa), flow is bigger, it is well no problem to control.But when the initial running of steam generator system, there is big problem, because flow was less when boiler just fed water (be about normal flow rate 25%), and operating pressure differential very big (reaching 10MPa), this moment, the aperture of valve was very little, the valve regulated instability, and with reforming phenomena.Boiler water produces serious cavitation phenomenon because of big pressure reduction, and cavitation cavitation and high flow rate wash away and can cause spool, sealing surface of seat badly damaged, leaks seriously when valve need be closed, and life of valve is shorter.
The second way adopts major and minor water supply system.Since boiler when just feeding water small flow valve opening little, regulate unstablely, can shake simultaneously, so adopt major and minor feed valve system to remedy this defective.The working principle of this system is: master's feed-regulating valve cuts out when just going up water, and the open auxiliary feed valve carries out the adjusting of small flow, big pressure reduction operating mode; When boiler worked well, main feed-regulating valve was opened gradually, and secondary feed-regulating valve cuts out, to satisfy nominal situation control requirement.This control system can satisfy initially, the nominal situation small-large flow is regulated, but the deficiency that has the following aspects: if 1 secondary feed-regulating valve does not adopt multistage buck configuration, can produce the cavitation cavitation phenomenons too, the trim of secondary feed-regulating valve is damaged; 2, owing to adopt two modulating valve work, control system complexity, energy consumption increase; 3, when requiring to cut off boiler feed water, the leakage rate of two deck valve doors is bigger than a deck valve door, and the probability that breaks down is also big.
Summary of the invention
The present invention is directed to the problems referred to above, a kind of water supply control valve for high-pressure boiler is provided, simple in structure, the reliable operation of this control valve can prevent cavitation, and regulating ratio is big, can satisfy small flow and normal feedwater simultaneously.
According to technological scheme of the present invention:
A kind of water supply control valve for high-pressure boiler, comprise valve body, valve gap, valve rod and trim, trim comprises valve seat, sleeve, compensating cylinder and spool members, spool members is fixed on the end of valve rod, valve inlet and valve outlet port that valve body is provided with valve pocket and communicates with valve pocket, the described trim of assembling in the valve pocket, described spool members comprises that sidewall has guide's spool of aperture, balance spring and sidewall and bottom have the main valve plug of aperture, described main valve plug matches with described valve seat, the roof anchorage of described guide's spool is on described valve rod, and described pilot valve core retainer plate is contained in the described main valve plug and with it and matches.
Further, be provided with the balanced seal ring between described compensating cylinder and the described sleeve.Described guide's spool is provided with sealing surface, is provided with interior valve seat in the described main valve plug, and described sealing surface matches with described interior valve seat.Aperture on described guide's spool and the described main valve plug has a plurality of respectively, is arrayed.
Technique effect of the present invention is: spool members of the present invention adopts guide's spool and main valve plug structure combining, boiler just on during water, guide's spool is opened, and carries out small flow by the aperture on guide's spool and the main valve plug and regulates and control; When valve flow increases, drive main valve plug by guide's spool and move upward, main valve plug is opened, and valve is in normal working; Close main valve plug during valve closing earlier, after close guide's spool.So just realized the feedwater adjusting of small-large flow, the cavitation cavitation phenomenons when having avoided small flow simultaneously, the valve regulated performance is accurate, and significantly improve working life.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of the spool members among the present invention;
Fig. 3 is the structural representation of the guide's spool among the present invention;
Fig. 4 is the structural representation of the main valve plug among the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is further described.
As shown in Figure 1 and Figure 2, the present invention includes valve body 4, valve gap 3, valve rod 2 and trim.Trim comprises valve seat 7, sleeve 6, compensating cylinder 5 and spool members.Spool members is fixed on the end of valve rod 2, valve inlet 14 and valve outlet port 13 that valve body 4 is provided with valve pocket 12 and communicates with valve pocket 12, the described trim of assembling in the valve pocket 12.Spool members of the present invention comprises that sidewall has the main valve plug 11 that guide's spool 8 of aperture 15, balance spring 10 and sidewall and bottom have aperture 15, main valve plug 11 matches with valve seat 7, the roof anchorage of guide's spool 8 is on valve rod 2, and guide's spool 8 is sleeved in the main valve plug 11 and with it and matches.Spool members of the present invention adopts guide's spool and main valve plug 11 structure combining, boiler just on during water, guide's spool 8 is opened, and carries out small flow by the aperture on guide's spool 8 and the main valve plug 11 15 and regulates and control; When valve flow increases, drive main valve plug 11 by guide's spool 8 and move upward, main valve plug 11 is opened, and valve is in normal working; Close main valve plug 11 during valve closing earlier, after close guide's spool 8.So just realized the feedwater adjusting of small-large flow, the cavitation cavitation phenomenons when having avoided small flow has simultaneously reduced noise pollution, and the valve regulated performance is accurate, and significantly improve working life.When guide valve core 8 was opened in the ban, main valve plug is isostasy about in the of 11, only needed less actuator just can overcome big shut off differential pressure, and guide's spool 8 plays the fluid pressure balance effect.
For enhanced leaktightness and stationary performance, between compensating cylinder 5 and sleeve 6, be provided with balanced seal ring 9.
As shown in Figure 3, Figure 4, guide's spool 8 is provided with sealing surface 16, valve seat 17 in being provided with in the main valve plug 11, and sealing surface 16 matches with interior valve seat 17.Aperture 15 on guide's spool 8 and the main valve plug 11 has a plurality of respectively, is arrayed.
Working principle of the present invention is as follows:
Manner of execution of the present invention is that the spool valve that moves upward is opened (the spring reset valve closes during failsafe valve).Concrete course of action is: when diaphragm actuator 1 acceptance increases from DSC (collective and distributive type control system) control signal, film chamber air pressure increases, its output force pushing bar is moved upward, drive the upwards action simultaneously of coupled valve rod 2, valve rod 2 and guide's spool 8 are by being threaded, this just makes the guide's spool 8 and the sealing surface of the interior valve seat 17 of main valve plug 11 be separated from, the boiler water aperture 15 on main valve plug 11 sidewalls of flowing through, the aperture 15 of aperture 15 on guide's spool 8 and main valve plug 11 lower ends carries out three grades of decompression ratios to be regulated, small flow when just feeding water to satisfy is accurately controlled, and this moment, main valve plug 11 was in the closed position with valve seat 7; When the traffic requirement of boiler feed water increases gradually, guide's spool 8 continues to move upward, drive upwards action of main valve plug 11, main valve plug 11 is opened with the sealing surface of valve seat 7 at this moment, realizes the adjusting control of the big flow small pressure difference of nominal situation by the control main valve plug 11 and the flow area of sleeve 6 unlatchings.
When diaphragm actuator 1 acceptance reduces from the DSC control signal, film chamber air pressure reduces, by the effect of actuator spring counter-force, its output force pushing bar is moved downward, drive coupled valve rod 2, guide's spool 8 is action downwards simultaneously, guide's spool 8 is connected by precompressed balance spring 10 with main valve plug 11, the pretightening force that balance spring 10 loads can overcome main valve plug 11 and sleeve 6, frictional force between the balanced seal ring 9, guide's spool 8 and main valve plug 11 are moved downward synchronously, reduce the unlatching cross section of main valve plug 11 and sleeve 6, reduce main confluent, close up to the main valve plug 11 and the sealing surface of valve seat 7.Guide valve core 8 continues to move downward in the ban, and guide's spool 8 compression balance springs 10 are up to cutting out whole valve featuring rigid cutting-off with the sealing surface of the interior valve seat 17 of main valve plug 11.
Leakage class of the present invention can reach ANSI CLASS V, and pressure rating reaches ANSI 2500lb.
Claims (4)
1. water supply control valve for high-pressure boiler, comprise valve body (4), valve gap (3), valve rod (2) and trim, trim comprises valve seat (7), sleeve (6), compensating cylinder (5) and spool members, spool members is fixed on the end of valve rod (2), valve inlet (14) and valve outlet port (13) that valve body (4) is provided with valve pocket (12) and communicates with valve pocket (12), the described trim of assembling in the valve pocket (12), it is characterized in that: described spool members comprises that sidewall has guide's spool (8) of aperture, balance spring (10) and sidewall and bottom have the main valve plug (11) of aperture, described main valve plug (11) matches with described valve seat (7), the roof anchorage of described guide's spool (8) is on described valve rod (2), and described guide's spool (8) is sleeved in the described main valve plug (11) and with it and matches.
2. according to the described water supply control valve for high-pressure boiler of claim 1, it is characterized in that being provided with balanced seal ring (9) between described compensating cylinder (5) and the described sleeve (6).
3. according to the described water supply control valve for high-pressure boiler of claim 1, it is characterized in that described guide's spool (8) is provided with sealing surface (16), be provided with interior valve seat (17) in the described main valve plug (11), described sealing surface (16) matches with described interior valve seat (17).
4. according to the described water supply control valve for high-pressure boiler of claim 1, it is a plurality of to it is characterized in that aperture on described guide's spool (8) and the described main valve plug (11) has respectively, is arrayed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101837084A CN101625033B (en) | 2009-08-05 | 2009-08-05 | Water supply control valve for high-pressure boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101837084A CN101625033B (en) | 2009-08-05 | 2009-08-05 | Water supply control valve for high-pressure boiler |
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| CN101625033A CN101625033A (en) | 2010-01-13 |
| CN101625033B true CN101625033B (en) | 2011-01-05 |
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| CN2009101837084A Active CN101625033B (en) | 2009-08-05 | 2009-08-05 | Water supply control valve for high-pressure boiler |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423505B (en) * | 2012-05-16 | 2016-03-23 | 江南阀门有限公司 | HV rapid switching valve |
| CN102829221B (en) * | 2012-09-11 | 2013-11-13 | 中国人民解放军总后勤部油料研究所 | Self-powered flow-stabilizing adjusting valve |
| WO2016011951A1 (en) * | 2014-07-22 | 2016-01-28 | 费希尔久安输配设备(成都)有限公司 | Balanced valve element and pressure regulating valve |
| CN105782470A (en) * | 2014-12-22 | 2016-07-20 | 中核苏阀科技实业股份有限公司 | Automatic depressurization system (ADS) valve |
| CN107893859A (en) * | 2017-11-08 | 2018-04-10 | 江苏国泉泵业制造有限公司 | A kind of pilot formula sleeve adjusting valve |
| CN108317298A (en) * | 2018-03-04 | 2018-07-24 | 江苏江进泵业有限公司 | Low leakage pilot-operated type single-seat adjusting valve spool |
| CN110966410B (en) * | 2019-11-27 | 2022-09-09 | 康赛特自动化集团有限公司 | High-pressure-difference micro flow control valve |
| CN112856005B (en) * | 2021-01-07 | 2022-08-09 | 宋丙臣 | Self-adaptive regulating circulating valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201496566U (en) * | 2009-08-05 | 2010-06-02 | 无锡卓尔阀业有限公司 | High-pressure boiler water feeding control valve |
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- 2009-08-05 CN CN2009101837084A patent/CN101625033B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201496566U (en) * | 2009-08-05 | 2010-06-02 | 无锡卓尔阀业有限公司 | High-pressure boiler water feeding control valve |
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| CN101625033A (en) | 2010-01-13 |
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