CN107228745B - Ball valve air tightness testing method and testing system - Google Patents
Ball valve air tightness testing method and testing system Download PDFInfo
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- CN107228745B CN107228745B CN201710577247.3A CN201710577247A CN107228745B CN 107228745 B CN107228745 B CN 107228745B CN 201710577247 A CN201710577247 A CN 201710577247A CN 107228745 B CN107228745 B CN 107228745B
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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
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Abstract
The invention discloses a ball valve air tightness test method and a test system, wherein the method is used for respectively carrying out an external leakage test and an internal leakage test, and the system comprises an air source, an inflation valve and an exhaust valve; the inflation valve and the exhaust valve are respectively arranged at two sides of the ball valve to be tested; two sides of the ball valve to be tested are connected with a conducting valve in a bridging way; the outlet of the charging valve is connected with a standard cavity, a high-pressure end switching valve is arranged between the charging valve and the standard cavity, the other outlet of the standard cavity is connected with the high-pressure end of a differential pressure sensor, and the low-pressure end of the differential pressure sensor is connected with one side of the ball valve, which is close to the exhaust valve, through the low-pressure end switching valve. The system provided by the invention has the advantages of simple structure, low cost and high internal leakage testing precision of the ball valve.
Description
Technical Field
The invention relates to a ball valve air tightness test method and a ball valve air tightness test system.
Background
The ball valve is a valve which uses a ball body with a circular through hole as an opening and closing piece, and the ball body rotates along with a valve rod so as to realize opening and closing actions. The ball valve is mainly used for cutting off, distributing and changing the flowing direction of a medium, and sealing detection is needed before delivery, otherwise, the ball valve has a large potential safety hazard in the use process.
A very typical ball valve air tightness test system is shown in fig. 1. The differential pressure and direct pressure comprehensive test method is characterized in that the differential pressure and direct pressure comprehensive test method is a differential pressure and direct pressure comprehensive test method gas circuit, and during test, the related motions are as follows:
and (3) leakage test: the detection part is a shell and an upper seal (valve rod part seal)
1) After the clamping of the ball valve (UUT) to be tested is completed, the handle of the ball valve is pulled to a 45-degree position, and the opening and closing piece is half-opened and half-closed;
2) The normally open electromagnetic valve HV6 for balancing is electrically closed, and the normally closed electromagnetic valves HV4 and HV5 are electrically opened;
3) The normal close electromagnetic valve HV1 for inflation is powered on, and the filtered dry air starts to fill the standard cavity (Ref) and the test cavity (UUT);
4) After the pressure in the cavity reaches a preset pressure value and is stable, the normally closed electromagnetic valve HV1 is powered off and closed firstly, and then the normally closed electromagnetic valve HV4 is powered off and closed;
5) A differential pressure sensor (PDI) starts to work, and performs leakage detection on the ball valve;
6) After the test is finished, the normally closed electromagnetic valve HV4 is firstly electrified and opened, then the normally closed electromagnetic valves HV2 and HV3 for exhaust are electrified and opened, the gas in the cavity starts to be exhausted, and after the gas is exhausted, the normally closed electromagnetic valves HV2, HV3, HV4 and HV5 are in power-off reset.
And (3) internal leakage test: the detection part is an inner opening and closing part (sphere part seal)
1) The normal close electromagnetic valve HV1 for inflation is electrically opened, and the filtered dry air starts to fill a test cavity (UUT);
2) After the pressure in the cavity reaches a preset pressure value and is stable, the normally closed electromagnetic valve HV1 is firstly powered off and closed, and then the ball valve is closed;
3) The normally closed electromagnetic valves HV2 and HV3 for exhaust are electrically opened, and the gas outside the opening and closing piece (sphere) is exhausted;
4) After the gas is emptied, the normally closed electromagnetic valves HV2 and HV3 are reset after power failure, and then the pressure sensors PT1 and PT2 start to work to detect internal leakage of the ball valves;
5) After the test is completed, the normally closed solenoid valves HV2 and HV3 are firstly powered on to exhaust (reset to close after the gas is exhausted), then the jig is opened, and the ball valve to be tested is taken out.
The test method has the following technical effects:
1. the internal leakage test is performed by using a differential pressure method, so that the detection precision can be remarkably improved.
2. And the outer leakage and the inner leakage are detected on the same clamping position respectively, so that the leakage probability and the abrasion of the jig sealing element caused by the clamping process are reduced, and the detection stability is improved.
However, such a detection system requires two direct pressure sensors and one micro differential pressure sensor, which is costly to test.
Disclosure of Invention
The invention provides a ball valve air tightness test method and a test system, which adopt the structure that only one micro differential pressure sensor is used, thus greatly saving the system cost.
The technical scheme adopted for solving the technical problems is as follows: the ball valve air tightness test method is used for carrying out external leakage test and internal leakage test on the ball valve, and the ball valve external leakage test comprises the following steps:
step A1, inflating, namely inflating the ball valve cavity and a standard cavity, wherein the opening angle of the ball valve is 20-70 degrees, and air entering the ball valve cavity fills the ball valve cavity comprising the periphery of the valve rod; ensuring that the air pressure in the cavity of the ball valve is consistent with the air pressure in the standard cavity;
a2, detecting, namely stopping inflating, wherein a differential pressure sensor is adopted for detecting, the high-pressure end of the differential pressure sensor is communicated with the standard cavity, the low-pressure end of the differential pressure sensor is communicated with the ball valve cavity, data transmitted by the differential pressure sensor are observed after 5-15s, and if the data transmitted by the differential pressure sensor continue to be zero or are within an allowable range, the ball valve is indicated to be free from leakage;
the ball valve internal leakage test comprises the following steps:
step B1, inflating, namely inflating the spherical opening and closing part in the ball valve; firstly, opening a ball valve and inflating the cavity of the ball valve; after the inflation is finished, the ball valve is closed, and the gas outside the opening and closing piece is exhausted;
step B2, detecting, wherein a differential pressure sensor is adopted for detecting, the high-pressure end of the differential pressure sensor is communicated with the two ends of the closed ball valve, the low-pressure end of the differential pressure sensor is isolated from the testing system through a low-pressure end switching valve, and the outdoor standard atmospheric pressure is kept in a low-pressure end pipeline of the differential pressure sensor; and observing data transmitted by the differential pressure sensor after 5-15s, and if the data transmitted by the differential pressure sensor is zero or within an allowable range, indicating that the ball valve has no internal leakage.
The invention can save the cost of detection equipment by only adopting one differential pressure sensor, and compared with the direct pressure test of the internal leakage of the ball valve by using the pressure sensor, the detection precision of the internal leakage of the ball valve is greatly improved after the differential pressure sensor is used.
The invention also provides a ball valve air tightness test system, which comprises an air source, an inflation valve and an exhaust valve; the inflation valve and the exhaust valve are respectively arranged at two sides of the ball valve to be tested; two sides of the ball valve to be tested are connected with a conducting valve in a bridging way; the outlet of the charging valve is connected with a standard cavity, a high-pressure end switching valve is arranged between the charging valve and the standard cavity, the other outlet of the standard cavity is connected with the high-pressure end of a differential pressure sensor, and the low-pressure end of the differential pressure sensor is connected with one side of the ball valve to be tested, which is close to the exhaust valve, through the low-pressure end switching valve.
The system has the advantages of simple structure, low cost and high test precision.
Further, in the ball valve air tightness test system, the following steps are provided: the automatic control system is used for automatically controlling the charging valve, the exhaust valve, the conducting valve, the high-voltage end switching valve and the low-voltage end switching valve.
A system for automatically detecting the air tightness of the ball valve is formed by using the control system, so that the labor cost is further reduced.
Further, in the ball valve air tightness test system, the following steps are provided: the air source is also connected with the charging valve through the filtering pressure regulating valve; and filters are arranged on two sides of the ball valve to be tested.
The pipeline and the valve of the test system are protected, so that pollutants in the ball valve to be tested are prevented from being transmitted to the test system, the running stability of the test system is improved, and the service life of the test system is prolonged.
Further, in the ball valve air tightness test system, the following steps are provided: and a silencer is arranged on the outer side of the exhaust valve.
The sound pollution caused by detection is reduced, and a clean working environment is provided.
Further, in the ball valve air tightness test system, the following steps are provided: the differential pressure sensor is a micro differential pressure sensor, balance valves for protecting the differential pressure sensor are connected across the two sides of the differential pressure sensor, and the balance valves are normally open electromagnetic valves.
If accidents such as power failure happen in the testing process, the normally open balance valve can balance the air pressures at two sides of the micro differential pressure sensor, so that the micro differential pressure sensor cannot be damaged due to exceeding of the measuring range.
Further, in the ball valve air tightness test system, the following steps are provided: the charging valve, the exhaust valve, the conduction valve, the high-voltage end switching valve, the low-voltage end switching valve and the balance valve are zero-leakage two-position two-way electromagnetic valves, and the charging valve, the exhaust valve, the conduction valve, the high-voltage end switching valve and the low-voltage end switching valve are normally closed electromagnetic valves.
The invention will be described in more detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of a prior art ball valve air tightness test system.
FIG. 2 is a schematic diagram of the ball valve air tightness test system of the present invention.
Detailed Description
As shown in fig. 2: the embodiment is an automatic test system for testing the external leakage and the internal leakage of a ball valve, which comprises an air source P, a filtering pressure regulating valve FR, an inflation valve HV1, a filter L, a ball valve UUT to be tested, a filter L and an exhaust valve HV2 which are connected in sequence; during inflation, an air source P with the pressure of 0.1-1.2MPa is discharged from an exhaust valve HV2 through a filtering pressure regulating valve FR, an inflation valve HV1, a ball valve UUT to be tested, a filter L. As used herein, the filter pressure regulating valve FR and the filter L filter the gas entering the test system, and effectively protect the test system. The two sides of the measured ball valve UUT are connected with a conducting valve HV3 in a bridging mode, an outlet of the charging valve HV1 is connected with a standard cavity Ref, a high-voltage end switching valve HV4 is arranged between the charging valve HV1 and the standard cavity Ref, the other outlet of the standard cavity Ref is connected with a high-voltage end of a differential pressure sensor PDI, and a low-voltage end of the differential pressure sensor PDI is connected with one side of the measured ball valve UUT, which is close to the exhaust valve HV2, through a low-voltage end switching valve HV 5. Here, automatic control of the charging valve HV1, the discharging valve HV2, the conducting valve HV3, the high-voltage side switching valve HV4, and the low-voltage side switching valve HV5 is achieved by using one controller, so as to form an automatic test system. The charging valve HV1, the discharging valve HV2, the conducting valve HV3, the high-voltage end switching valve HV4 and the low-voltage end switching valve HV5 are normally closed zero-leakage two-position two-way electromagnetic valves.
In this embodiment, the differential pressure sensor PDI is a micro differential pressure sensor, and balance valves HV6 for protecting the differential pressure sensor PDI are connected across the two sides of the differential pressure sensor PDI, where the balance valves HV6 are normally open electromagnetic valves, and are also zero leakage two-position two-way electromagnetic valves.
Under the control of the control system, the working process of the ball valve air tightness test system of the embodiment is as follows:
1. and (3) leakage test: the test is to detect if there is a gas leak from the valve in the future when the ball valve is not closed.
Firstly, inflating, wherein the inflating comprises the following steps:
1) After clamping of a ball valve (UUT) to be tested is completed, a handle of the UUT is pulled to a 45-degree position, and an opening and closing piece is opened, not completely opened or completely closed, and the opening angle can be 20-70 degrees, so that gas can enter a valve rod part;
2) The balance valve HV6 of the normally open electromagnetic valve is electrically closed, and the high-voltage end electromagnetic valve HV4 and the low-voltage end electromagnetic valve HV5 of the normally closed electromagnetic valve are electrically opened under the control of the control system.
3) The charging valve HV1 of the normally closed electromagnetic valve is electrically opened, and the dry air with the air pressure reaching 0.6MPa starts to fill the standard cavity Ref and the ball valve UUT after being filtered by the filter regulating valve FR and regulated by the air pressure, and the dry air comprises the valve rod part of the ball valve UUT.
4) After the pressure in the cavity reaches the preset pressure value of 0.6MPa and is stable, the control system controls the charging valve HV1 to be powered off and closed firstly, and then controls the high-voltage end switching valve HV4 to be powered off and closed.
Then, detection is performed, wherein the detection comprises:
5) The differential pressure sensor PDI starts to work, at this time, the high pressure end of the differential pressure sensor PDI is the set air pressure in the standard cavity Ref, and the low pressure end of the differential pressure sensor PDI is connected with the cavity of the measured ball valve UUT through the opened low pressure end switch valve HV 5. If the valve rod part of the measured ball valve UUT is well sealed or the shell is good, no gas leaks from the ball valve cavity, at the moment, the air pressure in the ball valve UUT is kept at a preset pressure value and is consistent with the standard cavity Ref, and data transmitted by the differential pressure sensor PDI is zero. If the valve rod part of the measured ball valve UUT is not well sealed and the shell is broken, gas can leak from the ball valve cavity, and at the moment, the balance of the two sides of the differential pressure sensor PDI can be broken. The data transmitted by the differential pressure sensor PDI can obtain a detection result on a control system. The test time is generally 5-15s, and in this embodiment, 5s is sufficient.
6) After the external leakage test is finished, the control system controls the exhaust valve HV2, the conduction valve HV3, the high-voltage end switch valve HV4 and the low-voltage end switch valve HV5 to be opened electrically, and gas in the cavity of the test system and the tested ball valve UUT is released from the exhaust valve HV2, and at the moment, the exhaust valve HV2 is not polluted by noise due to the installation of a silencer. After the gas is exhausted, the control system controls the normally closed exhaust valve HV2, the high-voltage end switching valve HV4 and the low-voltage end switching valve HV5 to be closed in a power-off mode. Only the on-valve HV3 continues to be on. At this time, the standard cavity Ref and the cavity of the ball valve to be tested are both free of air pressure (namely, the air pressure is the same as the outside, and the air pressure is regarded as the non-air pressure state in the test process).
2 internal leakage test: the detection part is an inner opening and closing part, namely the sealing of the sphere part.
The same as the leak test was also inflated first.
1) The control system controls the charge HV1 to be powered on, and the dry air with the air pressure reaching 0.6MPa starts to fill the ball valve UUT through the filtration of the filter regulating valve FR and the air pressure regulation. At this time, since the low-pressure side switching valve HV5 is closed, no gas enters the pipe between the low-pressure side switching valve HV5 and the differential pressure sensor, and no gas pressure is maintained in the pipe.
2) After the pressure in the cavity reaches the preset pressure value of 0.6MPa and is stable, the control system controls the charging valve HV1 to be closed, and then the ball valve is closed, taking the attention of complete closing. At this time, the air pressure in the through hole of the sphere was 0.6MPa.
3) The control system controls the exhaust valve HV2, the conduction valve HV3 to be opened, the low-pressure end switching valve HV5 to be continuously closed, and the gas outside the ball valve opening and closing piece (ball body) is discharged. At this time, since the muffler is attached to the exhaust valve HV2, noise pollution does not occur.
4) After the gas outside the ball valve opening and closing piece (ball) is exhausted, the control system closes the exhaust valve HV2, and then opens the high-pressure end switching valve HV4.
5) The differential pressure sensor PDI starts to work, and the ball valve is subjected to internal leakage detection; at this time, the low-pressure end of the differential pressure sensor PDI is connected with the non-pneumatic pipeline isolated from the measured cavity through the low-pressure end switch valve HV5, the high-pressure end is connected with the two ends of the measured ball valve UUT through the high-pressure end switch valve HV4 and the conducting valve HV3, if the ball body part is well sealed, the air in the ball body through hole can not leak to the place outside the ball body, and the two ends of the differential pressure sensor PDI are kept balanced. If the ball body is not sealed well, air in the ball body through hole can leak into a pipeline connected with the high-pressure end of the differential pressure sensor, balance at two ends of the differential pressure sensor PDI can be broken, and a control system can obtain a test result by reading data transmitted by the differential pressure sensor PDI. Here too, the PDI test time of the differential pressure sensor is 5S, and is practically 5-15S.
The embodiment has the following technical effects:
1. the differential pressure method is used for internal leakage test, so that the detection precision can be remarkably improved;
2. only 1 high-precision sensor is used, so that the manufacturing cost of the test equipment can be reduced;
3. and the outer leakage and the inner leakage are detected on the same clamping position respectively, so that the leakage probability and the abrasion of the jig sealing element caused by the clamping process are reduced, and the detection stability is improved.
4. The balance valve is added at the high-low pressure interface of the micro differential pressure sensor, so that the damage to the micro differential pressure sensor under the condition of abnormal power failure of equipment can be effectively prevented;
5. the filter is arranged on the pipelines at the two ends of the tested ball valve, so that the influence on the zero leakage electromagnetic valve caused by the fact that pollutants in the tested ball valve are transmitted to the pipeline of the testing system can be effectively prevented, and the running stability of the testing system is improved.
Claims (5)
1. A ball valve air tightness test system comprises an air source (P), an air charging valve (HV 1) and an air discharging valve (HV 2); the charging valve (HV 1) and the discharging valve (HV 2) are respectively arranged at two sides of the ball valve (UUT) to be tested; the method is characterized in that: two sides of the ball valve (UUT) to be tested are connected with a conducting valve (HV 3) in a bridging way; the outlet of the charging valve (HV 1) is connected with a standard cavity (Ref), a high-pressure end switching valve (HV 4) is arranged between the charging valve (HV 1) and the standard cavity (Ref), the other outlet of the standard cavity (Ref) is connected with the high-pressure end of a differential pressure sensor (PDI), and the low-pressure end of the differential pressure sensor (PDI) is connected with one side of a ball valve (UUT) close to an exhaust valve (HV 2) through a low-pressure end switching valve (HV 5).
2. The ball valve air tightness test system according to claim 1, wherein: the automatic control system for the gas charging valve (HV 1), the gas discharging valve (HV 2), the conducting valve (HV 3), the high-voltage end switch valve (HV 4) and the low-voltage end switch valve (HV 5) is further included.
3. The ball valve air tightness test system according to claim 1, wherein: the air source (P) is also connected with the charging valve (HV 1) through the filtering pressure regulating valve (FR); the two sides of the ball valve (UUT) to be tested are also provided with filters (L); a silencer is arranged outside the exhaust valve (HV 2).
4. A ball valve air tightness test system according to any of claims 1 to 3, wherein: the differential pressure sensor (PDI) is a micro differential pressure sensor, balance valves (HV 6) for protecting the differential pressure sensor (PDI) are bridged at two sides of the differential pressure sensor, and the balance valves (HV 6) are normally open electromagnetic valves.
5. The ball valve air tightness test system according to claim 4, wherein: the charging valve (HV 1), the exhaust valve (HV 2), the conduction valve (HV 3), the high-voltage end switch valve (HV 4), the low-voltage end switch valve (HV 5) and the balance valve (HV 6) are zero leakage two-position two-way electromagnetic valves, and the charging valve (HV 1), the exhaust valve (HV 2), the conduction valve (HV 3), the high-voltage end switch valve (HV 4) and the low-voltage end switch valve (HV 5) are normally closed electromagnetic valves.
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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 |
| CN110336058B (en) * | 2019-07-26 | 2020-10-02 | 武汉众宇动力系统科技有限公司 | Fuel cell stack detection method and detection device |
| CN210741775U (en) * | 2019-08-09 | 2020-06-12 | 宁德时代新能源科技股份有限公司 | Air tightness detection device |
| CN111272384B (en) * | 2020-02-21 | 2022-05-06 | 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 |
| CN112484937B (en) * | 2020-10-21 | 2022-12-13 | 吴江市海拓机械有限公司 | Valve sealing performance testing 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 |
| 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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| JP4056818B2 (en) * | 2002-07-26 | 2008-03-05 | 株式会社フクダ | Leak test method and apparatus |
| CN201917443U (en) * | 2010-12-21 | 2011-08-03 | 浙江亚太机电股份有限公司 | High-pressure gas precision detecting pipeline system used for detecting product |
| WO2015181609A1 (en) * | 2014-05-28 | 2015-12-03 | Dafram S.P.A. | Means and methods for detecting leakage in ball valves |
| CN205352643U (en) * | 2015-12-30 | 2016-06-29 | 无锡职业技术学院 | Solenoid valve leak testing device |
| CN207248452U (en) * | 2017-07-14 | 2018-04-17 | 深圳市高晟智能装备有限公司 | A kind of ball valve tightness test system |
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