CN107228745A - A kind of ball valve air tightness testing method and test system - Google Patents
A kind of ball valve air tightness testing method and test system Download PDFInfo
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- CN107228745A CN107228745A CN201710577247.3A CN201710577247A CN107228745A CN 107228745 A CN107228745 A CN 107228745A CN 201710577247 A CN201710577247 A CN 201710577247A CN 107228745 A CN107228745 A CN 107228745A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
Abstract
The invention discloses a kind of ball valve air tightness testing method and test system, this method is tried carrying out leakage test and interior test leakage respectively, and the system includes air-source, charge valve, air bleeding valve；Described charge valve and air bleeding valve is separately positioned on the both sides of tested ball valve；There is conducting valve in the both sides bridging of described tested ball valve；Standard chamber is connected in the outlet of described charge valve, high side switch valve is provided between charge valve and standard chamber, another outlet of standard chamber connects the high-pressure side of differential pressure pick-up, and the low-pressure end of differential pressure pick-up connects survey ball valve close to air bleeding valve side by Low side switch valve.The simple cost of system architecture of the present invention is low, and leakage measuring accuracy is high in ball valve.
Description
Technical field
The present invention relates to ball valve air tightness testing method and test system.
Background technology
Ball valve is to make opening and closing element with the spheroid with manhole, and spheroid is rotated with valve rod, to realize the valve of switching motion.
Ball valve is mainly used as cut-out, distribution and the flow direction for changing medium, is required for carrying out sealing propertytest before dispatching from the factory, not so makes
Larger potential safety hazard is had during.
It is a kind of very typical ball valve tightness test system as shown in Figure 1.It is a kind of differential pressure+vertical compression integration test
Method gas circuit, during test, its relevant action is：
Leakage test：Detection position is housing and upper sealing (sealing of valve rod position)
1) it is tested after the completion of ball valve (UUT) clamping, by its handle wrench to 45 ° of positions, the half-open semi-closure of opening and closing element；
2) balance normally open solenoid valve HV6 must be electrically turn off, and normally closed solenoid valve HV4, HV5 obtain electric-opening；
3) inflation obtains electric-opening with normally closed solenoid valve HV1, and filtered dry air starts filling standard chamber (Ref) and survey
Try chamber (UUT)；
4) cavity internal pressure is reached after preset pressure value and stabilization, and normally closed solenoid valve HV1 elder generations dead electricity is closed, subsequent normally closed electricity
Magnet valve HV4 dead electricity is closed；
5) differential pressure pick-up (PDI) is started working, and outer leak detection is carried out to ball valve；
6) after the completion of testing, normally closed solenoid valve HV4 first obtains electric-opening, obtains electric with normally closed solenoid valve HV2, HV3 with final vacuum
Open, gas starts discharge in cavity, after after gas emptying, normally closed solenoid valve HV2, HV3, HV4, HV5 dead electricity reset.
Interior test leakage examination：Detection position is interior opening and closing element (sealing of spheroid position)
1) inflation obtains electric-opening with normally closed solenoid valve HV1, and filtered dry air starts filling test chamber (UUT)；
2) cavity internal pressure is reached after preset pressure value and stabilization, and normally closed solenoid valve HV1 elder generations dead electricity is closed, then by ball valve
Close；
3) exhaust obtains electric-opening, the outer gas discharge of opening and closing element (spheroid) with normally closed solenoid valve HV2, HV3；
4) after after gas emptying, normally closed solenoid valve HV2, HV3 dead electricity reset, and then, pressure sensor PT1, PT2 start work
Make, inner hexagon is carried out to ball valve；
5) after the completion of testing, normally closed solenoid valve HV2, HV3 first obtain electric-opening and are exhausted and (reset and close after gas emptying),
Subsequent tool is opened, and takes out tested ball valve.
This method of testing has the following technical effect that：
1st, carry out interior test leakage using pressure differential method to try, be remarkably improved accuracy of detection.
2nd, leaked outside respectively and inner hexagon on same clamping position, reduce the Leakage probability that clamping process is brought
And the abrasion of tool seal, improve detection stability.
But, this detecting system needs two vertical compression sensors and a little differential pressure sensor, testing cost height enterprise.
The content of the invention
The present invention provides a kind of ball valve air tightness testing method and test system, and the system is only micro- with one using its structure
Differential pressure pick-up, can greatly save system cost.
The technical solution adopted for the present invention to solve the technical problems is：A kind of ball valve air tightness testing method, to ball valve
Leakage test and interior test leakage examination are carried out, ball valve leakage test comprises the following steps：
In step A1, inflation, the step, into ball valve chamber body with a standard interacvity air-filling, institute's ball valve opening angle exists
Between 20 ° -70 °, it is full of into the air in ball valve chamber body in the ball valve chamber body included around valve rod；Ensure in ball valve chamber body
Air pressure it is consistent with the air pressure of standard intracavitary；
In step A2, detection, the step, stop inflation, detected using a differential pressure pick-up, the high pressure of differential pressure pick-up
End is communicated with low-pressure end with being communicated in ball valve chamber body with standard intracavitary, and the data of differential pressure pick-up outflow are observed after 5-15s,
If the data of differential pressure pick-up outflow continue as zero or in allowed band, illustrate ball valve without leakage；
Test leakage examination comprises the following steps in ball valve：
To being inflated in opening and closing element spherical in ball valve in step B1, inflation, the step；First, ball valve is opened, to ball valve chamber
Inflation in vivo；After inflation is finished, ball valve is closed, the gas outside opening and closing element is vented；
In step B2, detection, the step, detected using a differential pressure pick-up, the high-pressure side of differential pressure pick-up and closing
Ball valve two ends communicate, the low-pressure end of differential pressure pickup is isolated by Low side switch valve with test system, differential pressure pickup
Low-pressure end pipeline in keep outdoor standard atmospheric pressure；The data of differential pressure pick-up outflow are observed after 5-15s, if differential pressure
The data of sensor outflow continue as zero or in allowed band, then illustrate ball valve non-internal leakage.
Detection device cost can be saved only with a differential pressure pickup in the present invention, compared to utilizing pressure sensing
Device makees the vertical compression test of leakage in ball valve, and after differential pressure pick-up, the accuracy of detection of leakage will be greatly improved in ball valve.
Present invention also offers a kind of ball valve tightness test system, including air-source, charge valve, air bleeding valve；Described
Charge valve and air bleeding valve are separately positioned on the both sides of tested ball valve；There is conducting valve in the both sides bridging of described tested ball valve；
The outlet of described charge valve is connected to standard chamber, and high side switch valve is provided between charge valve and standard chamber, standard chamber
Another export connects the high-pressure side of differential pressure pick-up, and it is close that the low-pressure end of differential pressure pick-up connects tested ball valve by Low side switch valve
Air bleeding valve side.
The simple cost of system architecture of the present invention is low, and measuring accuracy is high.
Further, in above-mentioned ball valve tightness test system：Also include to charge valve, air bleeding valve, conducting valve, high pressure
The control system that end switch valve, Low side switch valve are automatically controlled.
Using the system of control system one automatic detection ball valve air-tightness of formation, more further reduction it is artificial into
This.
Further, in above-mentioned ball valve tightness test system：Described air-source also just connects by filtering pressure regulator valve
Charge valve；Filter is additionally provided with the both sides of described tested ball valve.
Test system pipeline and valve are protected, the dispersion of pollutants in tested ball valve is prevented into test system,
Improve test system operation stability and increase the service life.
Further, in above-mentioned ball valve tightness test system：Noise reduction is additionally provided with the outside of described air bleeding valve
Device.
Due to the next sound pollution of detection band, there is provided a kind of clean working environment for reduction.
Further, in above-mentioned ball valve tightness test system：Described differential pressure pick-up is little differential pressure sensor,
Described differential pressure pick-up both sides bridging has the balanced valve protected to it, and described balanced valve is a kind of normally open solenoid valve.
In test process such as power failure etc. surprisingly, normally opened balanced valve can enter the air pressure of little differential pressure sensor both sides
Row balance, makes it not damaged due to no to scale.
Further, in above-mentioned ball valve tightness test system：Described charge valve, air bleeding valve, conducting valve, high-pressure side
Switch valve, Low side switch valve, balanced valve are zero leakage two-position two-way solenoid valve, charge valve, air bleeding valve, conducting valve, high-pressure side
Switch valve and Low side switch valve are normally closed solenoid valve.
Below with reference to drawings and examples, the present invention is described in detail.
Brief description of the drawings
Fig. 1 is current ball valve tightness test system schematic diagram.
Fig. 2 is ball valve tightness test system schematic diagram of the present invention.
Embodiment
As shown in Figure 2：The present embodiment is a kind of Auto-Test System that leakage and interior test leakage examination are carried out to ball valve, including according to
Air-source P, filtering pressure regulator valve FR, charge valve HV1, filter L, tested ball valve UUT, filter L, the air bleeding valve HV2 of secondary connection；
In inflation, the air-source P of 0.1-1.2MPa pressure is by filtering pressure regulator valve FR, charge valve HV1, tested ball valve UUT, filtering
Device L, from air bleeding valve HV2 discharge.Used here as filtering pressure regulator valve FR, filter L were carried out to the gas for entering test system
Filter, is effectively protected to test system.There is conducting valve HV3 in tested ball valve UUT both sides bridging, charge valve HV1's
Outlet is connected to standard chamber Ref, and high side switch valve HV4 is provided between charge valve HV1 and standard chamber Ref, standard chamber Ref's
Another export connects differential pressure pick-up PDI high-pressure side, differential pressure pick-up PDI low-pressure end by Low side switch valve HV5 connect by
Ball valve UUT is surveyed close to air bleeding valve HV2 sides.Here, realized using a controller to charge valve HV1, air bleeding valve HV2, conducting
Valve HV3, high side switch valve HV4, Low side switch valve HV5 are automatically controlled, and form an Auto-Test System.Charge valve
HV1, air bleeding valve HV2, conducting valve HV3, high side switch valve HV4, Low side switch valve HV5 are closed type zero leakage bi-bit bi-pass
Magnetic valve.
In the present embodiment, differential pressure pick-up PDI is little differential pressure sensor, and in differential pressure pick-up PDI both sides, bridging has to it
The balanced valve HV6 protected, balanced valve HV6 are a kind of normally open solenoid valves, are also zero leakage two-position two-way solenoid valve.
Under control system control, the course of work of the ball valve tightness test system of the present embodiment is as follows：
1st, leakage test：I.e. detection position is that housing and upper sealing valve rod position are sealed, and the test is detection future
When ball valve is not shut, if having gas and revealed at valve.
It is inflation first, inflation comprises the following steps：
1) include after the completion of tested ball valve (UUT) clamping, by its handle wrench to 45 ° of positions, opening and closing element is opened, and is not complete
Open, be also not completely turned off, opening angle 20 ° -70 ° can, such gas will enter valve rod position；
2) the balanced valve HV6 of normally open solenoid valve must be electrically turn off, normally closed solenoid valve high-pressure side magnetic valve HV4, low-pressure end electromagnetism
Valve HV5 obtains electric-opening under control system control.
3) the charge valve HV1 of normally closed solenoid valve obtains electric-opening, and air pressure is reached through filtering regulating valve FR filterings and air pressure adjustment
Dry air to 0.6MPa starts filling standard chamber Ref and ball valve UUT, including ball valve UUT valve rods position.
4) cavity internal pressure is reached after preset pressure value 0.6MPa and stabilization, the first dead electricity of control system control charge valve HV1
Close, then control high side switch valve HV4 dead electricity is closed.
Followed by detect, detection includes：
5) differential pressure pick-up PDI starts working, and now, differential pressure pick-up PDI high-pressure side is the setting in standard chamber Ref
Air pressure, and differential pressure pick-up PDI low-pressure end is by Low side switch valve HV5, the cavity with tested ball valve UUT opened
It is connected.If tested ball valve UUT valve rod position good seal or housing are intact, there will not be gas to be let out out of ball valve chamber body
Dew, now, the air pressure in ball valve UUT will remain in preset pressure value, and consistent with standard chamber Ref, differential pressure pick-up PDI is transmitted out
Data be zero.If it is damaged that tested ball valve UUT valve rod position seals bad housing, it will has gas out of ball valve chamber body
Leakage, now, it will break the balance of differential pressure pick-up PDI both sides.The data transmitted out by differential pressure pick-up PDI can be
Testing result is obtained in control system.The general test time selects 5s just can be with 5-15s, the present embodiment.
6) leakage is completed, control system control air bleeding valve HV2, conducting valve HV3, high side switch valve HV4, low-pressure end
Switch valve HV5 obtains electric opening, and gas in test system and tested ball valve UUT cavity is discharged from air bleeding valve HV2, now,
Air bleeding valve HV2 will not then produce noise pollution due to being mounted with muffler.After after gas emptying, control system controls normally closed row
Air valve HV2, high side switch valve HV4, Low side switch valve HV5 dead electricity are closed.Only conducting valve HV3 continues to turn on.Now, mark
Without air pressure, (it with the external world is equally an atmospheric pressure to be exactly, and is recognized in test process in quasi- chamber Ref and tested ball valve cavity
To be equally exactly no atmospheric pressure state with the external world).
Test leakage is tried in 2：Detection position be interior opening and closing element be exactly spheroid position sealing.
The same with leakage test is also to inflate first.
1) control system control inflation HV1 obtains electric-opening, and air pressure is reached through filtering regulating valve FR filterings and air pressure adjustment
0.6MPa dry air starts to fill out ball valve UUT.Now, because Low side switch valve HV5 is closed, then gas is not had and is entered
In pipeline between Low side switch valve HV5 and differential pressure pick-up, kept in pipeline without air pressure.
2) cavity internal pressure is reached after preset pressure value 0.6MPa and stabilization, and charge valve HV1 is closed in control system control, with
Ball valve is closed afterwards, notes completely closing.Now, air pressure 0.6MPa in spheroid through hole.
3) control system control air bleeding valve HV2, conducting valve HV3 are opened, Low side switch valve HV5 continues to close, by ball valve
The gas discharge of opening and closing element (spheroid) outside.Now, air bleeding valve HV2 does not have noise pollution then due to being mounted with muffler.
4) after the gas after ball valve opening and closing element (spheroid) outside is emptied, control system closes air bleeding valve HV2, later on high pressure
End switch valve HV4.
5) differential pressure pick-up PDI is started working, and inner hexagon is carried out to ball valve；Now, differential pressure pick-up PDI low-pressure end
Connect be by Low side switch valve HV5 isolate with tested cavity without air-pressure duct, high-pressure side passes through high side switch valve
HV4, conducting valve HV3 connect tested ball valve UUT two ends, if the air in spheroid position good seal, spheroid through hole would not
Place beyond spheroid is leaked to, differential pressure pick-up PDI two ends will keep balancing.If spheroid position seals bad, spheroid through hole
Interior air will be leaked in the pipeline being connected with differential pressure pick-up high-pressure side, and the balance at differential pressure pick-up PDI two ends will
Break, test result is obtained with by the control system reading differential pressure pick-up PDI data for transmitting out.Here differential pressure is sensed
It in 5s, practice is 5-15S that the device PDI testing times, which are also,.
The present embodiment has the following technical effect that：
1st, carry out interior test leakage using differential pressure method to try, be remarkably improved accuracy of detection；
2nd, using only 1 high-precision sensor, it is possible to decrease test equipment manufacturing cost；
3rd, leaked outside respectively and inner hexagon on same clamping position, reduce the Leakage probability that clamping process is brought
And the abrasion of tool seal, improve detection stability.
4th, balanced valve is added in little differential pressure sensor high-low pressure interface, can effectively prevented under unit exception powering-off state
Damage to little differential pressure sensor；
5th, filter is installed on the pipeline of tested ball valve two ends, can effectively prevents the dispersion of pollutants in tested ball valve from extremely surveying
The influence to zero leakage magnetic valve is caused in test system pipeline, test system operation stability is improved.
Claims (10)
1. a kind of ball valve air tightness testing method, leakage test is carried out to ball valve and interior test leakage is tried, it is characterised in that：
Ball valve leakage test comprises the following steps：
In step A1, inflation, the step, into ball valve chamber body with a standard interacvity air-filling, institute's ball valve open degree is in 20%-
Between 70%, it is full of into the air in ball valve chamber body in the ball valve chamber body included around valve rod；Ensure the gas in ball valve chamber body
Pressure is consistent with the air pressure of standard intracavitary；
In step A2, detection, the step, stop inflation, detected using a differential pressure pick-up, the high-pressure side of differential pressure pick-up is same
Standard intracavitary is communicated with low-pressure end with being communicated in ball valve chamber body, and the data of differential pressure pick-up outflow are observed after 5-15s, if
The data of differential pressure pick-up outflow continue as zero or in allowed band, then illustrate ball valve without leakage；
Test leakage examination comprises the following steps in ball valve：
To being inflated in opening and closing element spherical in ball valve in step B1, inflation, the step；First, ball valve is opened, into ball valve chamber body
Inflation；After inflation is finished, ball valve is closed, the gas outside opening and closing element is vented；
Step B2, detection, in the step, detected using a differential pressure pick-up, the high-pressure side of differential pressure pick-up and is closed
Ball valve two ends are communicated, and the low-pressure end of differential pressure pickup is isolated by Low side switch valve with test system, differential pressure pickup it is low
Outdoor standard atmospheric pressure is kept in pressure side pipeline；The data of differential pressure pick-up outflow are observed after 5-15s, if differential pressure is sensed
The data of device outflow continue as zero or in allowed band, then illustrate ball valve non-internal leakage.
2. the ball valve air tightness testing method described in claim 1, it is characterised in that：When carrying out air tightness test to ball valve,
Also include differential pressure pick-up is carried out to outrange protection.
3. the ball valve air tightness testing method described in claim 1, it is characterised in that：When carrying out air tightness test to ball valve,
Also include carrying out secondary pollution protection to test system pipeline and valve.
4. the ball valve air tightness testing method described in claim 1, it is characterised in that：When carrying out air tightness test to ball valve,
There are sound-silencing measures during deflation.
5. the ball valve air tightness testing method described in claim 1, it is characterised in that：Inflated in described step A1 and step B1
Air pressure be 0.6MPa.
6. a kind of ball valve tightness test system, including air-source (P), charge valve (HV1), air bleeding valve (HV2)；Described inflation
Valve (HV1) and air bleeding valve (HV2) are separately positioned on tested ball valve (UUT) both sides；It is characterized in that：In described tested ball valve
(UUT) both sides bridging has conducting valve (HV3)；Standard chamber (Ref) is connected in the outlet of described charge valve (HV1), in inflation
High side switch valve (HV4) is provided between valve (HV1) and standard chamber (Ref), another outlet of standard chamber (Ref) connects differential pressure biography
The high-pressure side of sensor (PDI), the low-pressure end of differential pressure pick-up (PDI) connects survey ball valve (UUT) by Low side switch valve (HV5) and leaned on
Nearly air bleeding valve (HV2) side.
7. ball valve tightness test system according to claim 6, it is characterised in that：Also include to charge valve (HV1), row
The control system that air valve (HV2), conducting valve (HV3), high side switch valve (HV4), Low side switch valve (HV5) are automatically controlled
System.
8. ball valve tightness test system according to claim 6, it is characterised in that：Described air-source (P) also passes through
Filtering pressure regulator valve (FR) just connects charge valve (HV1)；Filter (L) is additionally provided with the both sides of described tested ball valve (UUT)；
Muffler is additionally provided with the outside of described air bleeding valve (HV2).
9. according to any described ball valve tightness test system in claim 6 to 8, it is characterised in that：Described differential pressure is passed
Sensor (PDI) is little differential pressure sensor, there is the balanced valve protected to it in described differential pressure pick-up (PDI) both sides bridging
(HV6), described balanced valve (HV6) is a kind of normally open solenoid valve.
10. ball valve tightness test system according to claim 9, it is characterised in that：Described charge valve (HV1), row
Air valve (HV2), conducting valve (HV3), high side switch valve (HV4), Low side switch valve (HV5), balanced valve (HV6) are zero leakage
Two-position two-way solenoid valve, charge valve (HV1), air bleeding valve (HV2), conducting valve (HV3), high side switch valve (HV4) and low-pressure end
Switch valve (HV5) is normally closed solenoid valve.
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| CN107907274A (en) * | 2017-12-18 | 2018-04-13 | 昆山巧亿仁电子科技有限公司 | A kind of waterproof test equipment |
| CN109341984A (en) * | 2018-11-09 | 2019-02-15 | 安徽中科智能高技术有限责任公司 | A kind of anhydrous work seal detection device of gate valve and detection method |
| CN110336058A (en) * | 2019-07-26 | 2019-10-15 | 武汉众宇动力系统科技有限公司 | A kind of fuel cell pack detection method and detection device |
| CN111272384A (en) * | 2020-02-21 | 2020-06-12 | 安徽皖仪科技股份有限公司 | Detection method and device for detecting flow resistance by pressure drop contrast |
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| CN112484937A (en) * | 2020-10-21 | 2021-03-12 | 吴江市海拓机械有限公司 | Valve sealing performance testing method |
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| CN107907274A (en) * | 2017-12-18 | 2018-04-13 | 昆山巧亿仁电子科技有限公司 | A kind of waterproof test equipment |
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| CN111272384A (en) * | 2020-02-21 | 2020-06-12 | 安徽皖仪科技股份有限公司 | Detection method and device for detecting flow resistance by pressure drop contrast |
| CN111623937A (en) * | 2020-06-06 | 2020-09-04 | 江苏佳德安燃气设备科技有限公司 | Gas safety self-closing valve detection equipment and detection method |
| CN112484937A (en) * | 2020-10-21 | 2021-03-12 | 吴江市海拓机械有限公司 | Valve sealing performance testing method |
| CN112484937B (en) * | 2020-10-21 | 2022-12-13 | 吴江市海拓机械有限公司 | Valve sealing performance testing method |
| CN112710441A (en) * | 2020-12-16 | 2021-04-27 | 河北光德流体控制有限公司 | Ball valve air tightness water-free detection system and method |
| CN112710441B (en) * | 2020-12-16 | 2023-10-17 | 河北光德流体控制有限公司 | Ball valve air tightness anhydrous detection system and method |
| CN116593144A (en) * | 2023-05-17 | 2023-08-15 | 四川大学 | Forced seal ball valve life test bed based on acoustic emission technology |
| CN116593144B (en) * | 2023-05-17 | 2024-02-02 | 四川大学 | Detection method for forced sealing ball valve life test bed |
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