CN101713302B - Steam open type main throttle valve - Google Patents
Steam open type main throttle valve Download PDFInfo
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- CN101713302B CN101713302B CN200910180584.4A CN200910180584A CN101713302B CN 101713302 B CN101713302 B CN 101713302B CN 200910180584 A CN200910180584 A CN 200910180584A CN 101713302 B CN101713302 B CN 101713302B
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Abstract
The invention belongs to main throttles valve applied to a steam turbine, in particular to a steam open type main throttle valve. The steam open type main throttle valve is characterized in that a valve head and a piston are respectively arranged in two cavities communicated with a main steam channel; and a valve rod is provided with a throttle channel communicated with the main steam channel and a piston inner cavity. When main steam enters, the piston inner cavity can have pressure within a short time through the throttle channel so as to push the main throttle valve to open. In the whole open process of the main throttle valve, machine unit main steam is used as a power source, and other exterior power is not needed. The open time of the steam open type main throttle valve is shorter, and under the condition of a certain main steam parameter, the open time of the steam open type main throttle valve can be adjusted through changing the size of the throttle channel on the valve rod. When the main throttle valve needs to be closed, steam in the cavity at the right end of the piston needs to be exhausted only. Another closing mode of the steam open type main throttle valve can be operated through a hand wheel at the left end of the main throttle valve to forcibly close the main throttle valve. The whole device has simple structure and convenient operation.
Description
Technical field
The present invention relates to be applied to the main inlet throttle-stop valve of steam turbine, be specifically related to a kind of steam open type main throttle valve.
Background technique
As shown in Figure 1, it comprises the spring 5 that two ends are fixedly connected with housing 11, piston 4 respectively to conventional main inlet throttle-stop valve structure, and piston 4 is connected with valve head 2 by valve rod 3, and enclosure interior is provided with pressure oil cavity 6.Its working principle is: in main steam passes into valve body time, if right-hand member does not obtain pressure oil, because the pretightening force effect of right-hand member spring 5 makes main inlet throttle-stop valve always in closed condition.Therefore, need in main inlet throttle-stop valve simultaneously breakout pressure oil system to provide corresponding pressure oil for main inlet throttle-stop valve opening, make the pressure oil cavity 6 shown in Fig. 1 be full of the working oil of certain pressure, thereby the pretightening force that overcomes spring 5 promotes piston 4 to move right, and valve head 2 is connected with piston 4 by valve rod 3, therefore valve head 2, along with main inlet throttle-stop valve piston 4 moves right simultaneously, is opened main inlet throttle-stop valve thus, and last main steam enters to tune valve by main inlet throttle-stop valve valve seat 1.In the time that needs are closed main inlet throttle-stop valve, be mainly by the oil of relieving pressure oil pocket 6 interior storages, infer piston 4 and close main inlet throttle-stop valve thereby spring 5 discharges pretightening force.In the opening process of whole main inlet throttle-stop valve, need to provide the pressure oil-source except steam to main inlet throttle-stop valve, because high temperature and high pressure steam and oil coexist, need corresponding increase sealing gland 7, oil-sealing arrangement 8 and the thermal baffle 9 before both as shown in Figure 1, make structure complicated.Meanwhile, first the unlatching of the main inlet throttle-stop valve of this class formation must start petrol station and provide corresponding pressure oil to it, has increased the needed time that starts.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, steam open type main throttle valve that the opening time is short, its unlatching does not need exterior power, and operational reliability is high, is convenient to safeguard.
Realize the technological scheme of the object of the invention:.
A kind of steam open type main throttle valve, comprises the housing that has main steam passage, is provided with piston in housing, and piston is connected with valve head by valve rod.Valve head, piston are located at respectively in two cavitys with main steam channel connection, have the throttling passage that is communicated with main steam passage and piston cavity body on described valve rod.
A kind of steam open type main throttle valve as above, valve rod, valve head adopt integral structure, and handwheel guide rod is installed on valve head.
A kind of steam open type main throttle valve as above, valve rod adopts nut to be fixedly connected with piston.
A kind of steam open type main throttle valve as above, the sealing surface on valve head adopts Si Tailite alloy welding deposit.
A kind of steam open type main throttle valve as above, is provided with lining between piston and housing, between piston and lining, adopts seal ring seal.
Effect of the present invention is: on valve rod, offer the throttling passage that is communicated with main steam passage and piston cavity body, in the time that main steam enters, can make piston cavity body build-up pressure at short notice by throttling passage, open thereby promote main inlet throttle-stop valve.In whole main inlet throttle-stop valve opening process using unit main steam as power source, without any need for other extraneous power.The steam open type main throttle valve opening time is shorter, and when in the certain situation of main steam condition, the opening time of steam open type main throttle valve can be adjusted by the throttling latus rectum size changing on valve rod.In the time that needs are closed main inlet throttle-stop valve, only need the steam of bleed piston right-hand member chamber.The another kind mode of closing of steam open type main throttle valve can operate by the handwheel of main inlet throttle-stop valve left end, closes by force.Whole apparatus structure is simple, easy to operate.
brief description of the drawings
Fig. 1 is a kind of structural representation of conventional main inlet throttle-stop valve.
Fig. 2 is the structural representation of a kind of main inlet throttle-stop valve provided by the present invention.
In figure: 1. valve seat; 2. valve head; 3. valve rod; 4. piston; 5. spring; 6. pressure oil cavity; 7. sealing gland; 8. oil-sealing arrangement; 9. thermal baffle; 10. main steam passage; 11. housings; 12. piston cavity bodies; 13. throttling passages; 14. linings; 15. nuts; 16. handwheel guide rods; 17. seal rings.
embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 2, a kind of steam open type main throttle valve, comprises the housing 11 that has main steam path 10, is provided with piston 4 in housing 11, between piston 4 and housing 11, is provided with lining 14, between the lining 14 that piston 4 slides corresponding thereto, adopts seal ring 17 to seal.Piston 4 is connected with valve head 2 by valve rod 3, and piston 4 is fixedly connected with by nut 15 with valve rod 3.Handwheel guide rod 16 for supporting and lead is also installed on valve head 2.Good for ensureing sealing, the sealing surface on valve head 2 adopts Si Tailite alloy welding deposit.Valve head 2, piston 4 are located at respectively in two cavitys that are communicated with main steam path 10, main steam path 10 axially vertical with the connecting direction of two cavitys.On valve rod 3, have the throttling passage 13 that is communicated with main steam path 10 and piston cavity body 12, when main steam enters after the middle chamber between main inlet throttle-stop valve and piston, steam flows to piston right-hand member cavity by the throttling pore on valve rod, and at its short time build-up pressure.Valve rod 3, valve head 2 can adopt integral structure, or split-type structural.
The installation process of whole device is: first pack piston bushing 14 and piston 4 at housing 11 right-hand members, then on valve rod 3, pack the throttling plug screw by being threaded into, pack valve rod 3 and valve head 2 into from housing 11 left ends again, and allow valve rod 3 through piston 4, then by piston unt 15, valve rod 3 and piston 4 are fixed; Finally, pack the assembly such as guide rod handwheel 16, housing 11 into and by bolton, pack vexed mouthful of flange into and use bolton at right-hand member at left end.
The working principle of steam open type main throttle valve is: main steam passes to before main inlet throttle-stop valve, because the chamber pressure of piston right-hand member at the beginning is not also set up, and piston area is greater than main inlet throttle-stop valve flow area thus, main steam is greater than main steam to main inlet throttle-stop valve thrust left to piston thrust to the right, and therefore main inlet throttle-stop valve cannot be opened automatically.Then because valve rod place is to the throttling passage of piston right-hand member chamber, the chamber pressure of piston right-hand member was set up in the short time, thereby make: main steam produces the power of turning left at main inlet throttle-stop valve and adds the thrust that upper piston right end chamber chamber pressure turns left and be more than or equal to the thrust that main steam is turned right at piston left end, automatically opens toward moving left thereby promote main inlet throttle-stop valve.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.If these amendments and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (5)
1. a steam open type main throttle valve, comprise the housing (11) that has main steam passage (10), in housing (11), be provided with piston (4), piston (4) is connected with valve head (2) by valve rod (3), it is characterized in that: valve head (2), piston (4) are located at respectively in two cavitys that are communicated with main steam passage (10), on described valve rod (3), have the throttling passage (13) that is communicated with main steam passage (10) and piston cavity body (12).
2. according to a kind of steam open type main throttle valve claimed in claim 1, it is characterized in that: described valve rod (3), valve head (2) adopt integral structure, and handwheel guide rod (16) is installed on valve head (2).
3. according to a kind of steam open type main throttle valve described in claim 1 or 2, it is characterized in that: described valve rod (3) adopts nut (15) to be fixedly connected with piston (4).
4. according to a kind of steam open type main throttle valve claimed in claim 3, it is characterized in that: the sealing surface on described valve head (2) adopts Si Tailite alloy welding deposit.
5. according to a kind of steam open type main throttle valve claimed in claim 3, it is characterized in that: between described piston (4) and housing (11), be provided with lining (14), between piston (4) and lining (14), adopt seal ring (17) sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910180584.4A CN101713302B (en) | 2009-10-21 | 2009-10-21 | Steam open type main throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910180584.4A CN101713302B (en) | 2009-10-21 | 2009-10-21 | Steam open type main throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101713302A CN101713302A (en) | 2010-05-26 |
| CN101713302B true CN101713302B (en) | 2014-11-05 |
Family
ID=42417252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910180584.4A Active CN101713302B (en) | 2009-10-21 | 2009-10-21 | Steam open type main throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101713302B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102024503B (en) * | 2010-05-27 | 2013-08-14 | 中国核电工程有限公司 | Pneumatic auxiliary feed water pump of pressurized water reactor power station |
| CN108799536B (en) * | 2018-08-16 | 2024-06-04 | 中国船舶重工集团公司第七0四研究所 | Main valve stem structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958600A (en) * | 1973-01-25 | 1976-05-25 | Hans Kalb | Combined starting and rapid shut-off mechanism for steam and gas turbines |
| US4019713A (en) * | 1974-07-25 | 1977-04-26 | Aeg-Kanis Turbinenfabrik Gmbh | Rapid shutoff extraction check valve |
| US4114652A (en) * | 1975-04-30 | 1978-09-19 | Bbc Brown Boveri & Company Limited | Combined stop and control valve |
| US4475710A (en) * | 1980-05-22 | 1984-10-09 | Kraftwerk Union Aktiengesellschaft | Electro-hydraulic control actuator for turbine valves |
| JP3389103B2 (en) * | 1998-06-08 | 2003-03-24 | 三菱重工業株式会社 | Regulating valve |
| FR2865013B1 (en) * | 2004-01-13 | 2007-09-21 | D2Fc Energy Valves Sas | TURBINE GUARD TAP WITH INTEGRATED BY-PASS |
-
2009
- 2009-10-21 CN CN200910180584.4A patent/CN101713302B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3958600A (en) * | 1973-01-25 | 1976-05-25 | Hans Kalb | Combined starting and rapid shut-off mechanism for steam and gas turbines |
| US4019713A (en) * | 1974-07-25 | 1977-04-26 | Aeg-Kanis Turbinenfabrik Gmbh | Rapid shutoff extraction check valve |
| US4114652A (en) * | 1975-04-30 | 1978-09-19 | Bbc Brown Boveri & Company Limited | Combined stop and control valve |
| US4475710A (en) * | 1980-05-22 | 1984-10-09 | Kraftwerk Union Aktiengesellschaft | Electro-hydraulic control actuator for turbine valves |
| JP3389103B2 (en) * | 1998-06-08 | 2003-03-24 | 三菱重工業株式会社 | Regulating valve |
| FR2865013B1 (en) * | 2004-01-13 | 2007-09-21 | D2Fc Energy Valves Sas | TURBINE GUARD TAP WITH INTEGRATED BY-PASS |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101713302A (en) | 2010-05-26 |
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