CN202867999U - Steam extraction check valve and pneumatic actuator thereof - Google Patents
Steam extraction check valve and pneumatic actuator thereof Download PDFInfo
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- CN202867999U CN202867999U CN 201220506234 CN201220506234U CN202867999U CN 202867999 U CN202867999 U CN 202867999U CN 201220506234 CN201220506234 CN 201220506234 CN 201220506234 U CN201220506234 U CN 201220506234U CN 202867999 U CN202867999 U CN 202867999U
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- breathing pipe
- valve
- pneumatic actuator
- check valve
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Abstract
The utility model provides a pneumatic actuator of a steam extraction check valve which comprises an air supply, an air cylinder, and a control gas pipeline between the air supply and the air cylinder, wherein the control gas pipeline comprises a first air pipe which is communicated with the right cavity of the air cylinder and the air supply, a second air pipe which is communicated with the left cavity of the air cylinder and the air supply, and a reserving valve used for controlling air supply to flow into the left cavity or the right cavity. When the system is broke down, the steam extraction check valve is required in a closed condition and the reserving valve is controlled to conduct the second air pipe. The air supply flows into the left cavity. The air in the right cavity is communicated with atmosphere and flows out. The air is exhausted under the influence of a compressed spring and the pressure of the left cavity air. Compared with utilizing the acting force of the compressed spring to exhaust the air rapidly in the prior art, the acting force of the check valve is increased and safe reliability is improved when the steam extraction check valve is closed rapidly. The utility model further provides the steam extraction check valve which comprises the check valve and the pneumatic actuator used for controlling the opening and closing of the check valve.
Description
Technical field
The utility model relates to heat power station steam turbine generator technical group field, more particularly, relates to a kind of pneumatic actuator of extraction check valve, and the utility model also relates to a kind of extraction check valve with above-mentioned pneumatic actuator.
Background technique
The medium that extraction check valve is mainly used in the high row of heat power station steam turbine and each section extraction line is in the industrial pipeline system of steam or water; prevent that steam turbine set pressure in the steam turbine when suddenly removal of load from reducing suddenly; steam flows backwards to enter and causes turbine vane to smash in the steam turbine in extraction steam pipe and each heater; damage the serious accident of steam turbine generator; and prevent that the heater system pipe leakage from making water enter in the steam turbine and water hammer accident occurs from bleed steam pipework, with the safe operation of protection steam turbine.As the device that prevents medium counter flow; need extraction check valve in 0.5 second, to close closely fast, guaranteeing when the water level superelevation appears in feed water preheater, after the Pneumatic actuator parts are received the liquid countercurrent signal; steam turbine is separated rapidly, give steam turbine or steam bleeding system with maximum protection.
See also accompanying drawing 1-2, Fig. 1 is the structural representation of the extraction check valve of existing 600MW fired power generating unit steam turbine use, and Fig. 2 is the structure for amplifying schematic diagram of A part among Fig. 1; This extraction check valve comprises valve body 101 and the door-hinge 103 and the valve plate 102 that are arranged on the valve body 101, and an end of valve plate 102 is rotating to be socketed on the door-hinge 103, the sleeve joint hole hole wall of valve plate 102 is provided with the limit sliding chutes 104 of extending along circumferential direction, be provided with on the door-hinge 103 and the limit sliding chutes 104 spacing position limit pins that cooperate 105, both cooperations are used for restriction valve plate 102 can only rotate in the several angle scope, and the rotation of valve plate 102 can realize the keying of valve; This extraction check valve also comprises the pneumatic actuator that rotates for driving door-hinge 103, when driving door-hinge 103, rotates when being positioned at open position to valve plate 102 by pneumatic actuator, valve plate 102 is in free state, and aperture is controlled by charge air flow, and can prevent gas backstreaming; When pneumatic actuator drove door-hinge 103 and rotarily drives valve plate 102 and be positioned at closed position, the offseting of the end cell wall of position limit pin 105 and limit sliding chutes 104 cooperates time avoided freely rotating of valve plate 102.
See also accompanying drawing 3, this figure is the schematic diagram of the pneumatic actuator of existing extraction check valve, and this pneumatic actuator comprises source of the gas 311 and the cylinder that is connected with source of the gas 311.This cylinder comprises cylinder body 306, is used for driving the piston rod 301 that door-hinge 103 rotates, and is arranged on piston 304 and spring 303 in the cylinder body 306; Wherein, an end of piston rod 301 links to each other with piston 304, and the other end links to each other with door-hinge 103, and spring 303 is set on the piston rod 301; The inner chamber of cylinder body 306 is divided into left side cavity among the first cavity 302(figure by piston 304) and the second cavity 305(figure in the right side cavity), spring 303 is arranged in the first cavity 302.Source of the gas 311 is by the first breathing pipe I ' be connected upper filter 310, pressure regulator valve 309, pressure gauge, two-bit triplet solenoid valve 308 and the fast-discharge valve 307 of on the direction of source of the gas 311 to second cavitys 305, being provided with successively of the first breathing pipe I ' with the second cavity 305; This first breathing pipe I ' pass into the interior gas flow of cylinder for control, come the motion of control piston bar 301 by the gas flow in the change cylinder, and then the rotation of control door-hinge 103 contacts with disengaging or sealing between the valve body 101 to realize valve plate 102, thus the keying of realization valve.
When system starts, need extraction check valve to be in opening state, after pressurized air filters decompression through " two parts ", enter Normally closed type two-bit triplet solenoid valve 308, after the solenoid valve energising, pressurized air enters in the second cavity 305 by the control of solenoid valve, thereby pushing piston 304 is to left movement, Compress Spring 303, and then piston rod 301 is moved to left synchronously, piston rod 301 drives door-hinge 103 rotations to the position that valve plate 102 is opened, and valve plate 102 without hindrance permission under the pipeline medium effect opens and closes, and opening degree is relevant with pipe medium pressure and flow.
During the system failure, control system can send out code so that extraction check valve is in closed condition, two-bit triplet solenoid valve 308 outages this moment, gas in the second cavity 305 and atmosphere are connected and are carried out exhaust, Quick air-discharge under the acting in conjunction of compressed spring 303 and fast-discharge valve 307, piston rod 301 and piston 304 move to right together fast, and piston rod 301 drives door-hinge 103 rotations to the position that valve plate 102 is closed, and flows backwards to stop pipeline medium.
But, because above-mentioned pneumatic actuator is Quick air-discharge under the acting in conjunction of compressed spring and fast-discharge valve, and then realize closing of extraction check valve, its closing function power is less, when large or media flow active force is larger when the valve plate area, the spring force that driving extraction check valve door-hinge is closed is not enough to the valve complete shut-down, particularly when bite appears in valve plate and door-hinge etc., the active force of spring can not overcome the bite of larger friction and machinery well, valve plate is closed and can not be put in place, causes the safety reliability of quick closedown of extraction check valve low.
In sum, how providing a kind of pneumatic actuator of extraction check valve, drive the active force of valve closing with increase, and then improve the safety reliability of extraction check valve quick closedown, is the technical problem that present those skilled in the art need to be resolved hurrily.
The model utility content
In view of this, the purpose of this utility model is to provide a kind of pneumatic actuator of extraction check valve, drives the active force of valve closing with increase, and then improves the safety reliability of extraction check valve quick closedown.
The utility model also provides a kind of extraction check valve with above-mentioned pneumatic actuator.
In order to achieve the above object, the utility model provides following technological scheme:
A kind of pneumatic actuator of extraction check valve comprises source of the gas, cylinder and be connected to described source of the gas and described cylinder between the control air pipe; Described control air pipe comprises:
Be communicated in the right chamber of described cylinder and the first breathing pipe between the described source of the gas;
Be communicated in the left chamber of described cylinder and the second breathing pipe between the described source of the gas;
Be used for controlling described source of the gas to the change-over valve of described left chamber or described right chamber air inlet.
Preferably, in the above-mentioned pneumatic actuator, two five-way electromagnetic valves of described change-over valve for all being connected with described the first breathing pipe and described the second breathing pipe.
Preferably, in the above-mentioned pneumatic actuator, also be provided with fast-discharge valve on described the first breathing pipe, described fast-discharge valve is between described two five-way electromagnetic valves and described right chamber.
Preferably, in the above-mentioned pneumatic actuator, described change-over valve comprises the first two-bit triplet solenoid valve that is arranged on described the first breathing pipe and the second two-bit triplet solenoid valve that is arranged on described the second breathing pipe.
Preferably, in the above-mentioned pneumatic actuator, described the first two-bit triplet solenoid valve is for often driving the ventilatory solenoid valve; Described the second two-bit triplet solenoid valve is normally closed ventilatory solenoid valve.
Preferably, in the above-mentioned pneumatic actuator, the hydraulicdirectional control valve of described change-over valve for all being connected with described the first breathing pipe and described the second breathing pipe.
Preferably, in the above-mentioned pneumatic actuator, described control air pipe also comprises the 3rd breathing pipe that is communicated in described left chamber and described right chamber, also is provided with the moving test valve for its break-make of control on described the 3rd breathing pipe.
Preferably, in the above-mentioned pneumatic actuator, the two ends of described the 3rd breathing pipe are connected with described the first breathing pipe and described the second breathing pipe respectively, and described moving test valve is to be arranged on the second breathing pipe and the two-bit triplet solenoid valve that is connected with described the 3rd breathing pipe.
Preferably, in the above-mentioned pneumatic actuator, described the first breathing pipe, described the second breathing pipe and described the 3rd breathing pipe are the stainless steel breathing pipe.
The working procedure of the pneumatic actuator of the extraction check valve that the utility model provides is as follows:
When system starts, when needing extraction check valve to be in opening state, the control change-over valve makes the first breathing pipe conducting, source of the gas chamber air inlet to the right, right intracavity gas promote the piston of cylinder to left movement, the spring in the compression cylinder, and then the piston rod of cylinder is moved to left synchronously, piston rod drives coupled door-hinge rotation to the position that valve plate is opened, and the without hindrance permission under the pipeline medium effect of valve plate this moment opens and closes, and opening degree is relevant with pipe medium pressure and flow; When the chamber air inlet left of change-over valve control source of the gas, the first breathing pipe conducting;
Work as the system failure, when needing extraction check valve to be in closed condition, the control change-over valve makes the second breathing pipe conducting, source of the gas chamber air inlet left, gas in the right chamber and atmosphere are connected and are carried out exhaust, Quick air-discharge under the acting in conjunction of compressed spring and left chamber gas pressure, and piston rod and piston move to right together fast, and then realize that piston rod drives the door-hinge rotation to the position that valve plate is closed, and flows backwards to stop pipeline medium.
With only utilize compressed acting force of the spring Quick air-discharge in the prior art and compare, the pneumatic actuator of the extraction check valve that the utility model provides is Quick air-discharge under the acting in conjunction of compressed spring and left chamber gas pressure, has increased the active force that drives valve closing; When the valve plate area is large or the media flow active force is larger, when particularly bite appears in valve plate and door-hinge etc., above-mentioned active force can overcome the bite of larger friction and machinery well, valve plate is closed put in place, has improved the safety reliability of extraction check valve quick closedown.
The utility model also provides a kind of extraction check valve, comprises safety check and is used for controlling the pneumatic actuator that described safety check opens and closes, and described pneumatic actuator is above-mentioned any pneumatic actuator; Because above-mentioned pneumatic actuator has above-mentioned effect, the extraction check valve with above-mentioned pneumatic actuator has same effect, therefore this paper repeats no more.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the extraction check valve of existing 600MW fired power generating unit steam turbine use;
Fig. 2 is the structure for amplifying schematic diagram of A part among Fig. 1;
Fig. 3 is the schematic diagram of the pneumatic actuator of existing extraction check valve;
Fig. 4 is the schematic diagram of the pneumatic actuator of the extraction check valve that provides of the utility model embodiment.
Embodiment
The utility model embodiment provides a kind of pneumatic actuator of extraction check valve, has increased to drive the active force of valve closing, and then has improved the safety reliability of extraction check valve quick closedown.
For the purpose, technological scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technological scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment who obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to accompanying drawing 4, the pneumatic actuator of the extraction check valve that the utility model embodiment provides comprises source of the gas 7, cylinder 2 and be connected to source of the gas 7 and cylinder 2 between the control air pipe; The control air pipe comprises the right chamber 25 that is communicated in cylinder 2 and the first breathing pipe I between the source of the gas 7; Be communicated in the left chamber 22 of cylinder 2 and the second breathing pipe II between the source of the gas 7; The change-over valve that is used for chamber 22 or 25 air inlets of right chamber left of control source of the gas 7.
Need to prove, above-mentioned cylinder 2 comprises the piston rod 21 that rotates for the door-hinge 1 that drives extraction check valve, is arranged on piston 24 and spring 23 in the cylinder 2; Wherein, an end of piston rod 21 links to each other with piston 24, and the other end links to each other with door-hinge 1, and spring 23 is set on the piston rod 21; The inner chamber of cylinder 2 is divided into left side cavity among the left chamber 22(figure by piston 24) and right chamber 25(figure in the right side cavity), spring 303 is arranged in the left chamber 22, above-mentioned left chamber 22 is that cylinder 2 is near the cavity of an end of door-hinges 1.
The working procedure of the pneumatic actuator of the extraction check valve that the utility model embodiment provides is as follows:
When system starts, when needing extraction check valve to be in opening state, the control change-over valve makes the first breathing pipe I conducting, source of the gas 7 chamber 25 air inlets to the right, the interior gas push piston in right chamber 25 24 are to left movement, Compress Spring 23, and then piston rod 21 is moved to left synchronously, piston rod 21 drives 1 rotation of coupled door-hinge to the position that the valve plate that makes extraction check valve is opened, and the without hindrance permission under the pipeline medium effect of valve plate this moment opens and closes, and opening degree is relevant with pipe medium pressure and flow; When the chamber air inlet left of change-over valve control source of the gas, the first breathing pipe conducting;
Work as the system failure, when needing extraction check valve to be in closed condition, the control change-over valve makes the second breathing pipe II conducting, source of the gas 7 chamber 22 air inlets left, gas in the right chamber 25 and atmosphere are connected and are carried out exhaust, Quick air-discharge under the acting in conjunction of compressed spring 23 and left chamber 22 gas pressures, and piston rod 21 and piston 24 move to right together fast, and then realize that piston rod 21 drives door-hinge 1 rotation to the position that valve plate is closed, and flows backwards to stop pipeline medium; As shown in Figure 4, the direction of arrow of cylinder 2 tops is extraction check valve when closing, the moving direction of piston 24.
With only utilize compressed acting force of the spring Quick air-discharge in the prior art and compare, the pneumatic actuator of the extraction check valve that the utility model embodiment provides is Quick air-discharge under the acting in conjunction of compressed spring 23 and left chamber 22 gas pressures, has increased the active force that drives valve closing; When the valve plate area is large or the media flow active force is larger, when particularly bite appears in valve plate and door-hinge 1 etc., above-mentioned active force can overcome the bite of larger friction and machinery well, valve plate is closed put in place, has improved the safety reliability of extraction check valve quick closedown.
Preferably, in the pneumatic actuator that above-described embodiment provides, two five-way electromagnetic valves 4 of change-over valve for all being connected with the first breathing pipe I and the second breathing pipe II.The inlet hole of these two five-way electromagnetic valves 4 is connected with source of the gas 7, and its a air outlet hole is connected with the first breathing pipe I, and another air outlet hole is connected with the second breathing pipe II.At this moment, the public valve of the first breathing pipe I and the second breathing pipe II makes one of them pipeline and source of the gas 7 conductings, is convenient to installation and the control of pipeline; The pipeline that source of the gas 7 links to each other with two five-way electromagnetic valves 4 also is being disposed with filter 6, pressure regulator valve 5 and pressure gauge on the direction of 7 to two five-way electromagnetic valves 4 of source of the gas.
When opening extraction check valve, two five-way electromagnetic valves 4 are the first breathing pipe I conducting, so pressurized gass in the source of the gas 7 are filtered through filters 6 and pressure regulator valve 5 decompressions after chamber 25 air inlets to the right, and with left chamber 22 and atmosphere conducting; When closing extraction check valve, two five-way electromagnetic valves 4 are the second breathing pipe II conducting, and then make source of the gas 7 chamber 22 air inlets left, and with right chamber 25 and atmosphere conducting, piston 24 is fast moving under the acting in conjunction of spring 23 and gas pressure, and drives door-hinge 1 extraction check valve is closed fully.
In closing the process of extraction check valve, for the ease of the discharge of right chamber 25 interior gases, in the pneumatic actuator that above-described embodiment provides, I also is provided with fast-discharge valve 3 on the first breathing pipe, and fast-discharge valve 3 is between two five-way electromagnetic valves 4 and right chamber 25.This fast-discharge valve 3 makes right chamber 25 communicate with atmosphere, can carry out rapidly exhaust, is convenient to piston 24 and moves right, and then accelerate the closing velocity of extraction check valve.
In the pneumatic actuator that another embodiment of the utility model provides, change-over valve comprises the first two-bit triplet solenoid valve that is arranged on the first breathing pipe I and the second two-bit triplet solenoid valve that is arranged on the second breathing pipe II.
When opening extraction check valve, the first two-bit triplet solenoid valve is the first breathing pipe I conducting, and then makes source of the gas 7 chamber 25 air inlets to the right, and the second two-bit triplet solenoid valve is with left chamber 22 and atmosphere conducting simultaneously; When closing extraction check valve, the second two-bit triplet solenoid valve is with the second breathing pipe II conducting, and then make source of the gas 7 chamber 22 air inlets left, the first two-bit triplet solenoid valve is with right chamber 25 and atmosphere conducting simultaneously, piston 24 is fast moving under the acting in conjunction of spring 23 and gas pressure, and drives door-hinge 1 extraction check valve is closed fully.
Further, in order to accelerate the exhaust velocity in right chamber 25, in the pneumatic actuator that above-described embodiment provides, also can be provided with fast-discharge valve 3 between right chamber 25 and the first two-bit triplet solenoid valve.
Preferably, in the pneumatic actuator that above-described embodiment provides, the first two-bit triplet solenoid valve is for often driving the ventilatory solenoid valve; The second two-bit triplet solenoid valve is normally closed ventilatory solenoid valve.Because under the state of the normal operation of system, extraction check valve is in opening state, need control the first two-bit triplet solenoid valve conduction and the second two-bit triplet solenoid valve to block, in the present embodiment, no electric circuit when often opening the first two-bit triplet solenoid valve conduction state of ventilatory, no electric circuit when normally closed ventilatory the second two-bit triplet solenoid valve blocks state, therefore, in the process of system's long-time running, above-mentioned the first two-bit triplet solenoid valve and the second two-bit triplet solenoid valve are not charged, improve the working life of solenoid valve, and then improved the working life of pneumatic actuator, improved simultaneously the safety reliability of valve.
It will be understood by those skilled in the art that, above-mentioned change-over valve also can be other valve mechanism, such as the hydraulicdirectional control valve 4 for all being connected with the first breathing pipe I and the second breathing pipe II, perhaps adopt hand-operated direction valve, to reach same conducting the first breathing pipe I or the second breathing pipe II, so that the effect of source of the gas 7 chamber 22 or 25 air inlets of right chamber is left introduced no longer one by one at this.
In order to judge in advance between pneumatic actuator and door-hinge 1 and the valve plate bite phenomenon whether occurs, in the pneumatic actuator that above-described embodiment provides, the control air pipe also comprises the 3rd breathing pipe III that is communicated in left chamber 22 and right chamber 25, also is provided with the moving test valve for its break-make of control on the 3rd breathing pipe III.
Before pneumatic actuator uses, need to carry out the bite test to extraction check valve, at first the conducting moving test valve makes left chamber 22 be connected with right chamber 25, this moment, all pressed with right chamber 25 in left chamber 22, piston can move under the active force of spring to the right, when motion obviously activity directly perceived, can judge the bite phenomenon not occur, and then can verify that extraction check valve can normally use.
In order further to optimize technique scheme, the two ends of above-mentioned the 3rd breathing pipe III are connected with the first breathing pipe I and the second breathing pipe II respectively, and moving test valve is to be arranged on the second breathing pipe II and the two-bit triplet solenoid valve 8 that is connected with the 3rd breathing pipe III.At this moment, the 3rd breathing pipe III is connected between the first breathing pipe I and the second breathing pipe II, and the air outlet hole of two-bit triplet solenoid valve 8 is connected with left chamber 22, and inlet hole is connected with change-over valve, and exhaust port is connected with the 3rd breathing pipe III.
Carrying out bite when test, the control by two-bit triplet solenoid valve 8 makes the 3rd breathing pipe III conducting, and the second breathing pipe II is blocked; After test was complete, the control by two-bit triplet solenoid valve 8 was blocked the 3rd breathing pipe III, and the second breathing pipe II conducting can not affect the action of follow-up the second breathing pipe II chamber 22 air inlets left.
Certainly, above-mentioned moving test valve can also adopt manually-operated gate, hydrovalve or other can realize the valve of pipeline break-make, and the present embodiment is not done restriction to this.
In order further to improve the working life of pneumatic actuator, above-mentioned the first breathing pipe I, the second breathing pipe II and the 3rd breathing pipe III are the stainless steel breathing pipe.Stainless steel breathing pipe mechanical strength is high, and is corrosion-resistant, has higher Security; Certainly, the above-mentioned breathing pipe breathing pipe that can also use other materials to make.
The utility model also provides a kind of extraction check valve, comprises safety check and is used for the pneumatic actuator that the control safety check opens and closes, the pneumatic actuator that this pneumatic actuator provides for the utility model embodiment any one.
The pneumatic actuator that above-mentioned extraction check valve adopts the present embodiment to provide, increased the active force that drives valve closing, and then improved the safety reliability of extraction check valve quick closedown, its advantage is brought by pneumatic actuator, concrete please refer to part relevant in above-described embodiment, just repeat no more at this.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and other embodiments' difference that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make related domain professional and technical personnel can realize or use the utility model.Multiple modification to these embodiments will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from spirit or scope of the present utility model, in other embodiments realization.Therefore, the utility model will can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the pneumatic actuator of an extraction check valve comprises source of the gas (7), cylinder (2) and be connected to described source of the gas (7) and described cylinder (2) between the control air pipe; It is characterized in that, described control air pipe comprises:
Be communicated in the right chamber (25) of described cylinder (2) and the first breathing pipe (I) between the described source of the gas (7);
Be communicated in the left chamber (22) of described cylinder (2) and the second breathing pipe (II) between the described source of the gas (7);
Be used for controlling described source of the gas (7) to described left chamber (22) or the change-over valve of described right chamber (25) air inlet.
2. pneumatic actuator according to claim 1 is characterized in that, two five-way electromagnetic valves (4) of described change-over valve for all being connected with described the first breathing pipe (I) and described the second breathing pipe (II).
3. pneumatic actuator according to claim 2 is characterized in that, (I) also is provided with fast-discharge valve (3) on described the first breathing pipe, and described fast-discharge valve (3) is positioned between described two five-way electromagnetic valves (4) and the described right chamber (25).
4. pneumatic actuator according to claim 1, it is characterized in that, described change-over valve comprises the first two-bit triplet solenoid valve that is arranged on described the first breathing pipe (I) and the second two-bit triplet solenoid valve that is arranged on described the second breathing pipe (II).
5. pneumatic actuator according to claim 4 is characterized in that, described the first two-bit triplet solenoid valve is for often driving the ventilatory solenoid valve; Described the second two-bit triplet solenoid valve is normally closed ventilatory solenoid valve.
6. pneumatic actuator according to claim 1 is characterized in that, the hydraulicdirectional control valve (4) of described change-over valve for all being connected with described the first breathing pipe (I) and described the second breathing pipe (II).
7. the described pneumatic actuator of any one according to claim 1-6, it is characterized in that, described control air pipe also comprises the 3rd breathing pipe (III) that is communicated in described left chamber (22) and described right chamber (25), also is provided with the moving test valve for its break-make of control on described the 3rd breathing pipe (III).
8. pneumatic actuator according to claim 7, it is characterized in that, the two ends of described the 3rd breathing pipe (III) are connected with described the first breathing pipe (I) and described the second breathing pipe (II) respectively, and described moving test valve is for to be arranged on the second breathing pipe (II) and the two-bit triplet solenoid valve (8) that is connected with described the 3rd breathing pipe (III).
9. pneumatic actuator according to claim 8 is characterized in that, described the first breathing pipe (I), described the second breathing pipe (II) and described the 3rd breathing pipe (III) are the stainless steel breathing pipe.
10. extraction check valve comprises safety check and is used for controlling the pneumatic actuator that described safety check opens and closes, and it is characterized in that, described pneumatic actuator is the described pneumatic actuator of the claims 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220506234 CN202867999U (en) | 2012-09-28 | 2012-09-28 | Steam extraction check valve and pneumatic actuator thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220506234 CN202867999U (en) | 2012-09-28 | 2012-09-28 | Steam extraction check valve and pneumatic actuator thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202867999U true CN202867999U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220506234 Expired - Lifetime CN202867999U (en) | 2012-09-28 | 2012-09-28 | Steam extraction check valve and pneumatic actuator thereof |
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| CN (1) | CN202867999U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108916161A (en) * | 2018-08-24 | 2018-11-30 | 武汉联航机电有限公司 | A kind of atmospheric control and control method |
-
2012
- 2012-09-28 CN CN 201220506234 patent/CN202867999U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108916161A (en) * | 2018-08-24 | 2018-11-30 | 武汉联航机电有限公司 | A kind of atmospheric control and control method |
| CN108916161B (en) * | 2018-08-24 | 2023-09-26 | 武汉精智智能制造有限公司 | Pneumatic control system and control method |
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