CN103134667B - Detecting device and detecting method of pilot valve for valve positioner - Google Patents
Detecting device and detecting method of pilot valve for valve positioner Download PDFInfo
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- CN103134667B CN103134667B CN201110379421.6A CN201110379421A CN103134667B CN 103134667 B CN103134667 B CN 103134667B CN 201110379421 A CN201110379421 A CN 201110379421A CN 103134667 B CN103134667 B CN 103134667B
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- pilot valve
- pressure arm
- shaped pipe
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Abstract
The invention discloses a detecting device and a detecting method of a pilot valve for a valve positioner. The detecting device of the pilot valve for the valve positioner comprises a base, a pressure arm, a check valve and a U-shaped pipe, wherein the pilot valve is fixed on the base; the end portion of a pushing rod of the pilot valve abuts against the pressure arm; one end of the pressure arm is in hinge connection with and fixed on the base; the base is provided with a pressure arm adjusting bolt and a graduated scale; one end of the pressure arm adjusting bolt and one end of the graduated scale are respectively in hinge connection with the base; the other end of the pressure arm adjusting bolt and the other end of the graduated scale respectively penetrate through the pressure arm; the pressure arm adjusting bolt is provided with an adjusting nut; dyeing liquid is arranged in the U-shaped pipe; and an air outlet of the check valve is respectively communicated with one end of the U-shaped pipe and an air inlet of the pilot valve. The detecting device and the detecting method of the pilot valve for the valve positioner have the advantages of providing judgment possibilities for a condition whether off-machine maintenance parts of the pilot valve can be normally utilized on-machine or not and accordingly reducing the consumption of spare parts and saving the production costs.
Description
Technical field
The present invention relates to a kind of pilot valve for valve positioner, particularly a kind of pick-up unit of pilot valve for valve positioner and detection method thereof.
Background technology
Valve positioner is used in the middle of various industrial automation process control field, is one of the important accessory and accessory of pneumatic control valve, plays valve positioning action.Valve positioner and pneumatic actuator form Automatic Control Unit jointly, and valve positioner receives the weak electric signal in self-controller or control system, and carry out the device of by-pass valve control position to pneumatic actuator conveying air signal.Itself and pneumatic control valve support the use, and form close loop control circuit.The DC current signal that control system provides is converted to the gas signal driving variable valve, the action of regulating and controlling valve, feed back according to the aperture of variable valve, the control signal that valve location is exported by system is correctly located simultaneously.
The on-the-spot topworks of power industry because of control overflow precision high, a large amount of apolegamys have the topworks of valve positioner, and the aperture being realized topworks by valve positioner regulates.Pilot valve (pilot) is as the core component of valve positioner, and the working pressure providing valve positioner different by steering order, makes steady arm realize aperture thus and control, to realize the accurate control of closed-loop parameters.
Fig. 1 is the structural representation of pilot valve for valve positioner, as shown in the figure, pilot valve comprises valve body 1 and spool 2, spool 2 is provided with push rod 3, spool 2 is also provided with retracing spring 6, and valve body 1 is provided with gas access 4 and gas vent 5, and the end of valve body 1 is provided with end cap 7, push rod 3 is through end cap 7, and its head stretches the outside at end cap 7.The elastic force of pilot valve core retracing spring 6 provide pilot valve open needed for power, the characteristic of sensitivity when the opening travel of push rod can react breakdown action.
Pilot valve for valve positioner is at the scene in practical work process, and actuating medium is instrument air, installs and uses environment and mostly is outdoor, and therefore pilot valve makes the problem of topworks's misoperation occur repeatedly because blocking causes opening control device malfunctioning.Existing more renew pilot valve work time, because of without detection means, thus pilot valve whether just know after can only installing use can be working properly, for minority substandard product, disturb the time of fixing a breakdown.Further, after, maintenance clean for large quantities of pilot valve off-line changed, the device not having the sealing property that can close it and opening travel value detect, therefore cannot recycle, cause operation expense to rise.
Summary of the invention
The object of this invention is to provide a kind of pick-up unit of pilot valve for valve positioner, detect pilot valve, judge whether it can use, thus reduce troubleshooting time, what increase pilot valve recycles rate, reduces maintenance cost.
Another object of the present invention is to provide a kind of detection method of pilot valve for valve positioner.
For achieving the above object, the pick-up unit of pilot valve for valve positioner of the present invention comprises: pedestal, pressure arm, retaining valve and U-shaped pipe, and pilot valve is fixed on described pedestal, and the end of the push rod of pilot valve abuts against on described pressure arm; One end of described pressure arm is hingedly fixed on described pedestal; Described pedestal is provided with a pressure arm adjusting bolt and a graduated scale, and one end of described pressure arm adjusting bolt and scale is hinged with described pedestal respectively, and the other end is each passed through described pressure arm, and described pressure arm adjusting bolt is provided with setting nut; Be provided with dyeing liquid in described U-shaped pipe, the gas outlet of described retaining valve is communicated with one end of U-shaped pipe and the gas access of pilot valve respectively.
The gas vent of pilot valve is connected with a throttling valve.
Described U-shaped pipe is provided with scale.
The detection method of pilot valve for valve positioner of the present invention, the pick-up unit of above-mentioned pilot valve for valve positioner is adopted to detect, comprise the steps: step one, screw setting nut, make pressure arm compress the push rod of pilot valve, and record the start index value corresponding to scale upper pressing arm; Step 2, to check valve inlet gas injection; After step 3, gas injection stop, whether the liquid level of observing both sides dyeing liquid in U-shaped pipe changes, if liquid level changes, then pilot valve is abnormal, if liquid level does not change, then pilot valve closedown performance is normal.
To the normal pilot valve of closedown performance described in step 3, also comprise the steps: that hand-held press arm free end upwards exerts a force, and unscrew setting nut gradually, until when in U-shaped pipe, the liquid level of both sides dyeing liquid starts to change, stop the rotation setting nut, and the stroke mark value recorded now corresponding to scale upper pressing arm, the opening travel of push rod is calculated by start index value described in described stroke mark value and step one.
The present invention can be used for carrying out offline inspection to the duty of pilot valve, and judges that it is good and bad, avoids pilot valve operation irregularity and brings actuating mechanism controls Its Failures.By pick-up unit and the detection method thereof of pilot valve for valve positioner of the present invention, the lower machine for pilot valve is safeguarded that can part normally use on the machine to provide and is judged possibility, thus decreases the consumption of spare part, has saved production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of pilot valve for valve positioner;
Fig. 2 is the schematic diagram of pick-up unit first state of pilot valve for valve positioner of the present invention;
Fig. 3 is the enlarged diagram of retaining valve in Fig. 2;
Fig. 4 is the schematic diagram of pick-up unit second state of pilot valve for valve positioner of the present invention;
Fig. 5 is the process flow diagram of the detection method of pilot valve for valve positioner of the present invention.
Embodiment
See Fig. 2 and Fig. 4, the pick-up unit of pilot valve for valve positioner of the present invention comprises: pedestal 10, pressure arm 20, retaining valve 30 and U-shaped pipe 40, pilot valve is fixed on described pedestal 10, one end of described pressure arm 20 is hingedly fixed on pedestal 10, and the end of the push rod 3 of pilot valve abuts against on described pressure arm 20; Described pedestal 10 is provided with a pressure arm adjusting bolt 11 and scale 13, and one end of described pressure arm adjusting bolt 11 and scale 13 is hinged with described pedestal 10 respectively, and the other end is each passed through described pressure arm 20, and described pressure arm adjusting bolt 11 is provided with setting nut 12; Be provided with dyeing liquid 41 in described U-shaped pipe 40, the gas outlet 32 of described retaining valve 30 is communicated with one end of U-shaped pipe 40 and the gas access 4 of pilot valve respectively.The gas outlet 32 of retaining valve 30 can be connected by flexible pipe 33 with the gas access 4 of pilot valve.
Described pressure arm 20 can rotate around the pin joint hinged with pedestal 10, pilot valve push rod 3 and pressure arm 20 near contact point can be positioned at the upper side near pin joint of pressure arm 20, described scale 13 is provided with the scale that can read pilot valve push rod 3 stroke.Described scale can be set in advance on scale 13 according to the displacement of pilot valve push rod 3, just can react the stroke of pilot valve push rod 3 like this from scale 13.
Described setting nut 12 is threaded with pressure arm adjusting bolt 11, by screwing setting nut 12, setting nut 12 extrudes pressure arm 20, just can compress downwards push rod 3, if unscrew setting nut, and hand-held pressure arm 20 free end is upwards lifted gently, push rod 3 will stretch out under the effect of retracing spring 6, and pilot valve is opened.
Fig. 3 is the enlarged diagram of retaining valve in Fig. 2, and as shown in the figure, retaining valve 30 includes air intake opening 31 and gas outlet 32, and its spool 34 is provided with retracing spring 35, after gas enters from air intake opening 31, after backing down spool 34, gives vent to anger from gas outlet 32.When not having gas to enter, spool 34 resets under the effect of retracing spring 35, and retaining valve 30 is closed.Certainly, the retaining valve in the present invention can adopt conventional retaining valve.
When air intake opening 31 gas injection by retaining valve 30, the mode that mouth is blown can be adopted, also can adopt air bag gas injection.The dyeing liquid 41 of both sides in U-shaped pipe 40 can be made after gas injection to occur difference in height, when pilot valve break down can not close or its spool 2 opens time, the both sides difference in height of its dyeing liquid 41 can change, and the high side of liquid level declines.When opening for avoiding spool 2, liquid level declines too fast, and the gas vent 5 of pilot valve connects a throttling valve 50, by regulating throttling valve 50, increasing exhaust damping, amplifying action response time, make course of action clear.
Whether the liquid level for convenience of the dyeing liquid 41 observing U-shaped pipe 41 changes, and can arrange rule, or be provided with scale on U-shaped pipe 40 side on U-shaped pipe 40.
Fig. 5 is the process flow diagram of the detection method of pilot valve for valve positioner of the present invention, as shown in the figure, adopts the pick-up unit of pilot valve for valve positioner of the present invention to detect pilot valve, can detect the closedown performance of pilot valve and open performance.
One, screw setting nut, detect and close performance, as shown in Figure 2.
Be fixed on by pilot valve on pedestal 10, each parts all connection put in place, and regulate the position of setting nut 12 and the contact point of push rod 3 and pressure arm.
When starting to detect, screw setting nut 12, make pressure arm 20 compress pilot valve push rod 3, and record the start index value corresponding to scale 13 upper pressing arm 20.
Then to check valve inlet gas injection, stop gas injection after injecting certain gas, gas injection can be make the dyeing liquid 41 of side rise to maximum.Whether the liquid level of observing both sides dyeing liquid 41 in U-shaped pipe after gas injection changes.Observe liquid level and whether change the liquid level value can taking to record both sides dyeing liquid 41 when stopping gas injection, observe liquid level value after crossing certain hour and whether change.
If liquid level changes, then pilot valve is abnormal.Can clean the pilot valve of exception, maintain after detect again.If liquid level does not change, illustrate that the closedown performance of pilot valve is normal, can not leak.
Two, unscrew setting nut gradually, detect opening feature, as shown in Figure 4.
If the liquid level of above-mentioned detection does not change, then hand-held pressure arm 20 free end upwards exerts a force, and unscrew setting nut 12 gradually, until when in U-shaped pipe 40, the liquid level of both sides dyeing liquid 41 starts to change, stop the rotation setting nut 12, and the stroke mark value recorded now corresponding to scale 13 upper pressing arm 20, the opening travel of push rod 3 can be calculated by described stroke mark value and start index value.Its computing method are conventional method, therefore repeat no more.
Push rod opening travel and standard value are compared, just can judge that whether its unlatching performance is qualified.It has been generally acknowledged that the push rod opening travel that its opening feature is qualified and standard value difference should standard value ± 5% within.Described standard value can be the opening travel value according to technological requirement setting, also can draw by carrying out detection to new pilot valve.
Claims (5)
1. a pick-up unit for pilot valve for valve positioner, is characterized in that, comprising: pedestal, pressure arm, retaining valve and U-shaped pipe,
Pilot valve is fixed on described pedestal, and the end of the push rod of pilot valve abuts against on described pressure arm;
One end of described pressure arm is hingedly fixed on described pedestal;
Described pedestal is provided with a pressure arm adjusting bolt and a graduated scale, and one end of described pressure arm adjusting bolt and scale is hinged with described pedestal respectively, and the other end is each passed through described pressure arm, and described pressure arm adjusting bolt is provided with setting nut;
Be provided with dyeing liquid in described U-shaped pipe, the gas outlet of described retaining valve is communicated with one end of U-shaped pipe and the gas access of pilot valve respectively.
2. the pick-up unit of pilot valve for valve positioner as claimed in claim 1, is characterized in that, the gas vent of pilot valve is connected with a throttling valve.
3. the pick-up unit of pilot valve for valve positioner as claimed in claim 1, it is characterized in that, described U-shaped pipe is provided with scale.
4. a detection method for pilot valve for valve positioner, is characterized in that, adopts the pick-up unit of pilot valve for valve positioner as claimed any one in claims 1 to 3 to detect, comprises the steps:
Step one, screw setting nut, make pressure arm compress the push rod of pilot valve, and record the start index value corresponding to scale upper pressing arm;
Step 2, to check valve inlet gas injection;
After step 3, gas injection stop, whether the liquid level of observing both sides dyeing liquid in U-shaped pipe changes, if liquid level changes, then pilot valve is abnormal, if liquid level does not change, then pilot valve closedown performance is normal.
5. the detection method of pilot valve for valve positioner as claimed in claim 4, is characterized in that, to the normal pilot valve of closedown performance described in step 3, also comprise the steps:
Hand-held press arm free end upwards exerts a force, and unscrew setting nut gradually, until when in U-shaped pipe, the liquid level of both sides dyeing liquid starts to change, stop the rotation setting nut, and the stroke mark value recorded now corresponding to scale upper pressing arm, the opening travel of push rod is calculated by start index value described in described stroke mark value and step one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110379421.6A CN103134667B (en) | 2011-11-24 | 2011-11-24 | Detecting device and detecting method of pilot valve for valve positioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110379421.6A CN103134667B (en) | 2011-11-24 | 2011-11-24 | Detecting device and detecting method of pilot valve for valve positioner |
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| Publication Number | Publication Date |
|---|---|
| CN103134667A CN103134667A (en) | 2013-06-05 |
| CN103134667B true CN103134667B (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110379421.6A Active CN103134667B (en) | 2011-11-24 | 2011-11-24 | Detecting device and detecting method of pilot valve for valve positioner |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108593225A (en) * | 2018-06-22 | 2018-09-28 | 上海浦东新区张江电机有限公司 | A kind of worm speed-down case leakage detection method and detection device |
| CN114295342B (en) * | 2021-12-01 | 2022-08-02 | 深圳市摩控自动化设备有限公司 | Intelligent detection device and detection method for valve positioner |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3878862A (en) * | 1973-02-02 | 1975-04-22 | Otis Eng Co | Pneumatic valve position indicator |
| CN1908609A (en) * | 2006-08-23 | 2007-02-07 | 中国第一汽车集团公司 | Dry testing method for pressure limiting valve opening pressure |
| CN2919221Y (en) * | 2006-07-14 | 2007-07-04 | 上海汽车股份有限公司中国弹簧厂 | Air tightness experimental bench |
| CN101151485A (en) * | 2005-03-04 | 2008-03-26 | 斯楚有限公司 | Safety valve testing |
| CN101446512A (en) * | 2008-09-26 | 2009-06-03 | 上汽通用五菱汽车股份有限公司 | Automotive fuel leak detection method |
| CN101975645A (en) * | 2010-11-12 | 2011-02-16 | 金海峰 | Air tightness detection method of upper pond body on methane pond |
-
2011
- 2011-11-24 CN CN201110379421.6A patent/CN103134667B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3878862A (en) * | 1973-02-02 | 1975-04-22 | Otis Eng Co | Pneumatic valve position indicator |
| CN101151485A (en) * | 2005-03-04 | 2008-03-26 | 斯楚有限公司 | Safety valve testing |
| CN2919221Y (en) * | 2006-07-14 | 2007-07-04 | 上海汽车股份有限公司中国弹簧厂 | Air tightness experimental bench |
| CN1908609A (en) * | 2006-08-23 | 2007-02-07 | 中国第一汽车集团公司 | Dry testing method for pressure limiting valve opening pressure |
| CN101446512A (en) * | 2008-09-26 | 2009-06-03 | 上汽通用五菱汽车股份有限公司 | Automotive fuel leak detection method |
| CN101975645A (en) * | 2010-11-12 | 2011-02-16 | 金海峰 | Air tightness detection method of upper pond body on methane pond |
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| CN103134667A (en) | 2013-06-05 |
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