CN103076048A - Method for measuring flow of valve - Google Patents
Method for measuring flow of valve Download PDFInfo
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- CN103076048A CN103076048A CN2012105926623A CN201210592662A CN103076048A CN 103076048 A CN103076048 A CN 103076048A CN 2012105926623 A CN2012105926623 A CN 2012105926623A CN 201210592662 A CN201210592662 A CN 201210592662A CN 103076048 A CN103076048 A CN 103076048A
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Abstract
The invention provides a method for measuring the flow of a valve, belonging to the technical field of valves. The method is used for solving the problem that the existing flow measurement device cannot be applicable to the measurement of the flow of the valve due to low applicability. The method comprises the following steps of: (A) measuring flow coefficients: measuring and recording the flow coefficients of the valve at all opening degrees; (B) measuring pressure difference: measuring the pressure difference between a front end and a rear end of the valve; (C) calculating the flow: calculating the flow by using a formula (shown in a drawing), wherein Q is the flow of the valve at a current opening degree, KV is the flow coefficient of the valve at the current opening degree, and the deltaP is the pressure difference between the front end and the rear end of the valve at the current opening degree. According to the method, flows, corresponding to different opening degrees, of the valve can be calculated, so that the method has higher practical value.
Description
Technical field
The invention belongs to valve technology field, relate to a kind of measuring method of valve flow.
Background technology
The valve flow coefficient is commonly referred in China: the KV value, what KV represented is the negotiability of valve.KV value when the KVS value is valve wide open, for example the variable valve of a Kvs=50 represents that then the water yield hourly is 50m during valve wide open when valve two ends pressure reduction is 100KPa
3
Valve opening refers to valve when regulating, and the position of spool (or valve plate) motion represented with number percent that usually closed condition is 0% when spool (or valve plate) changed the runner orifice size, and standard-sized sheet is 100%.
Traditional valve does not have the flow indication function.And general flow measurement device does not have valve regulated and switching function, and flow measurement device is expensive, failure rate is high.Its publication number of Chinese patent CN101900581A provides " a kind of method and system of the flow for measurement gas/liquid stream ", and it comprises: make to be separated into gas core and liquid outer field swirling flow gas/liquid flow and to flow through and comprise the conduit with the contraction flow region that reduces conduit cross section; Gas core static difference between the upstream position of measurement contraction flow region and the position at contraction flow region place is pressed; Measurement provides another amount of the mutual relationship between gas flow, fluid flow or gas flow and the fluid flow; And pressed and another amount of measuring is determined gas flow and fluid flow by gas core static difference.
Availablely find out that it is that the pipeline of fixed measure is measured and since valve when using its aperture may change, therefore, it can't be applicable to the flow measurement of valve.
Summary of the invention
The objective of the invention is the problems referred to above of existing for prior art, a kind of measuring method that can easily carry out flow measurement to each aperture of valve is provided.
Purpose of the present invention can realize by following technical proposal: a kind of measuring method of valve flow, and the method may further comprise the steps:
A, measuring flow coefficient: measure the coefficient of flow of valve when each aperture, the coefficient of flow record during with each aperture;
B, measurement pressure reduction: the pressure reduction of measuring the valve front and back ends;
C, calculated flow rate: utilize formula
The valve front end that calculated flow rate, Q are the valve flow of current valve opening, coefficient of flow that KV is current valve opening, Δ P is current valve opening and the pressure reduction between the rear end.
Measurement of discharge generally was with flowmeter or ultrasonic flow instrumentation in the past.This measuring method is passed through formula
Calculated flow rate.But KV is relevant with the area of valve core opening shape or spool and valve seat, so KV can be relevant with valve opening.That is to say, be that individual relational expression KV=f (L) is arranged at KV and valve opening in fact, but can not go especially to calculate this relational expression, but the coefficient of flow value when measuring in advance each aperture.That is to say
Particularly, the coefficient of flow when at first measuring each aperture of valve certainly, is the ascending or descending proceeding measurement of its aperture during measurement.And with the data recording of measuring, the data of each measurement are corresponding with corresponding valve opening.
The front and back ends pressure reduction of test valve obtains passing through formula behind this pressure reduction
Calculate valve flow.Coefficient of flow when wherein KV is current valve opening, this coefficient obtains in steps A, then just can calculate the flow of valve in this aperture by above-mentioned formula.
In the measuring method of above-mentioned valve flow, valve opening each integer number percent in 1%-100% scope is measured respectively in the described steps A, obtains 100 groups of numerical value and with its record successively.
The data of above-mentioned measurement can be recorded in paper spare form or the computer data.The aperture retrieval coefficient of flow corresponding with it according to valve during paper spare table lookup gets final product, and the aperture of directly input correspondence can obtain coefficient of flow in the computer data.
In the measuring method of above-mentioned valve flow, adopt common measuring cell that the front-end and back-end of valve are measured respectively among the described step B, obtain the pressure reduction of valve front and back ends.
Measure respectively valve front end pressure and valve rear end pressure, just can obtain the front and back end pressure reduction of valve.
In the measuring method of above-mentioned valve flow, adopt common differential manometer to measure the pressure reduction of valve front and back ends among the described step B.
Differential manometer is the instrument of measuring point-to-point transmission pressure differential in roadway or the pipeline fluid, it is widely used in measuring pressure, filter resistance, wind speed, furnace pressure, orifice plate differential pressure, bubble water level and liquid amplifier or the hydraulic system pressure etc. of fan and fan blower, also be used for simultaneously the control of air gas ratio and the autovalve control of combustion process, and the blood pressure in the medical health equipment and respiratory pressure monitoring.Certainly, also can record pressure difference signal with pressure difference transmitter according to actual needs, calculate pressure reduction.
In the measuring method of above-mentioned valve flow, formulate a form corresponding with this valve in the described steps A, record successively from small to large coefficient of flow corresponding to each aperture on the form.
By the form people can intuitive and convenient the inquiry coefficient of flow corresponding with this valve opening.
In the measuring method of above-mentioned valve flow, the data of coefficient of flow corresponding to each aperture are recorded in the computer data in the described steps A.
Behind the above-mentioned database of Input of Data, people are the inquiry coefficient of flow corresponding with this valve opening in database conveniently.For example, utilize single-chip microcomputer with pressure difference data and coefficient of flow data acquisition, then calculate data on flows, export by display output or with analog/digital signal.
Compared with prior art, the measuring method of this valve flow only need to be measured valve front and back end pressure reduction, just can calculate the flow of valve when this aperture by formula again.Because corresponding coefficient of flow has been measured and record in advance during each aperture, therefore, passes through formula
Available direct calculated flow rate.
Because the different opening at valve all can calculate the flow corresponding with it, obviously, has higher practical value.
Embodiment
The measuring method of this valve flow may further comprise the steps:
A, measuring flow coefficient: valve opening each integer number percent in 1%-100% scope is measured respectively, obtains 100 groups of numerical value and with its record successively.In the present embodiment, formulate a form corresponding with this valve, record successively from small to large coefficient of flow corresponding to each aperture on the form.Because the gauge size of each valve is all different, so will formulate the form corresponding with it.Certainly, according to actual conditions, it also is feasible in the computer data that the data of the coefficient of flow that each aperture is corresponding are recorded in.
B, measurement pressure reduction: adopt common measuring cell that the front-end and back-end of valve are measured respectively, obtain the pressure reduction of valve front and back ends.According to actual conditions, the pressure reduction that directly adopts common differential manometer to measure the valve front and back ends also is feasible.
C, calculated flow rate: utilize formula
The front end that calculated flow rate, Q are the valve flow of current aperture, coefficient of flow that KV is current valve opening, Δ P is current valve opening and the pressure reduction between the rear end.KV can be with inquiring about by above-mentioned form or database, and Δ P is the pressure reduction of measuring among the step B.
Wherein coefficient of flow that is to say that for what measure in advance steps A is only measured once in the steps A, will get final product after 100 groups of data recording that measure.When carrying out flow measurement later at every turn, only valve front and back end pressure reduction is measured and got final product the data extraction of coefficient of flow by recording.Coefficient of flow adopts general measuring method to measure in the steps A.
Claims (6)
1. the measuring method of a valve flow, the method may further comprise the steps:
A, measuring flow coefficient: measure the coefficient of flow of valve when each aperture, the coefficient of flow record during with each aperture;
B, measurement pressure reduction: the pressure reduction of measuring the valve front and back ends;
C, calculated flow rate: utilize formula
The valve front end that calculated flow rate, Q are the valve flow of current valve opening, coefficient of flow that KV is current valve opening, Δ P is current valve opening and the pressure reduction between the rear end.
2. the measuring method of valve flow according to claim 1 is characterized in that, valve opening each integer number percent in 1%-100% scope is measured respectively in the described steps A, obtains 100 groups of numerical value and with its record successively.
3. the measuring method of valve flow according to claim 1 and 2 is characterized in that, adopts common measuring cell that the front-end and back-end of valve are measured respectively among the described step B, obtains the pressure reduction of valve front and back ends.
4. the measuring method of valve flow according to claim 1 and 2 is characterized in that, adopts common differential manometer to measure the pressure reduction of valve front and back ends among the described step B.
5. the measuring method of valve flow according to claim 2 is characterized in that, formulates a form corresponding with this valve in the described steps A, records successively from small to large coefficient of flow corresponding to each aperture on the form.
6. the measuring method of valve flow according to claim 2 is characterized in that, the data of coefficient of flow corresponding to each aperture are recorded in the computer data in the described steps A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105926623A CN103076048A (en) | 2012-12-29 | 2012-12-29 | Method for measuring flow of valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105926623A CN103076048A (en) | 2012-12-29 | 2012-12-29 | Method for measuring flow of valve |
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| CN2012105926623A Pending CN103076048A (en) | 2012-12-29 | 2012-12-29 | Method for measuring flow of valve |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364044A (en) * | 2013-06-26 | 2013-10-23 | 宁波钢铁有限公司 | Full-range measurement method and device for diffusion capacity of gas chamber |
| CN103729505A (en) * | 2013-12-23 | 2014-04-16 | 苏州纽威阀门股份有限公司 | CFD (computational fluid dynamics) based method for computing equivalent length of valve |
| CN104236640A (en) * | 2014-08-22 | 2014-12-24 | 河北钢铁股份有限公司承德分公司 | Simple gas flow measuring device and measuring method |
| CN105865543A (en) * | 2016-04-12 | 2016-08-17 | 北京华热科技发展有限公司 | Hydraulic balance valve, detection adjusting method of serial-connection tail end thereof and detection adjusting device |
| CN106091101A (en) * | 2016-06-06 | 2016-11-09 | 北京华热科技发展有限公司 | A kind of hydraulically balanced adjustment method and system |
| CN106353103A (en) * | 2016-10-12 | 2017-01-25 | 中国船舶重工集团公司第七研究所 | Method for testing high-power natural gas injection valve |
| CN109212998A (en) * | 2017-06-29 | 2019-01-15 | 苏州热工研究院有限公司 | A kind of nuclear power plant's check-valves different flow operating condition flow resistance coefficient analogy method and system |
| CN110296826A (en) * | 2019-05-14 | 2019-10-01 | 玉环市国达阀门有限公司 | A kind of inflation valve detection device |
| CN113049253A (en) * | 2019-12-10 | 2021-06-29 | 中国航发商用航空发动机有限责任公司 | Nozzle simulation device and fuel system experiment platform |
Citations (2)
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| CN1069135A (en) * | 1991-07-26 | 1993-02-17 | 北京市西城区新开通用试验厂 | A kind of electromechanical integrated digital controlled metrological valve device |
| CN1630841A (en) * | 2002-02-07 | 2005-06-22 | 东洋阀门株式会社 | Flow regulating valve, flow rate measuring device, flow control device, and flow rate measuring method |
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- 2012-12-29 CN CN2012105926623A patent/CN103076048A/en active Pending
Patent Citations (2)
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| CN1069135A (en) * | 1991-07-26 | 1993-02-17 | 北京市西城区新开通用试验厂 | A kind of electromechanical integrated digital controlled metrological valve device |
| CN1630841A (en) * | 2002-02-07 | 2005-06-22 | 东洋阀门株式会社 | Flow regulating valve, flow rate measuring device, flow control device, and flow rate measuring method |
Non-Patent Citations (1)
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364044A (en) * | 2013-06-26 | 2013-10-23 | 宁波钢铁有限公司 | Full-range measurement method and device for diffusion capacity of gas chamber |
| CN103729505A (en) * | 2013-12-23 | 2014-04-16 | 苏州纽威阀门股份有限公司 | CFD (computational fluid dynamics) based method for computing equivalent length of valve |
| CN103729505B (en) * | 2013-12-23 | 2017-01-18 | 苏州纽威阀门股份有限公司 | CFD (computational fluid dynamics) based method for computing equivalent length of valve |
| CN104236640A (en) * | 2014-08-22 | 2014-12-24 | 河北钢铁股份有限公司承德分公司 | Simple gas flow measuring device and measuring method |
| CN105865543A (en) * | 2016-04-12 | 2016-08-17 | 北京华热科技发展有限公司 | Hydraulic balance valve, detection adjusting method of serial-connection tail end thereof and detection adjusting device |
| CN106091101A (en) * | 2016-06-06 | 2016-11-09 | 北京华热科技发展有限公司 | A kind of hydraulically balanced adjustment method and system |
| CN106353103A (en) * | 2016-10-12 | 2017-01-25 | 中国船舶重工集团公司第七研究所 | Method for testing high-power natural gas injection valve |
| CN106353103B (en) * | 2016-10-12 | 2019-04-05 | 中国船舶重工集团公司第七一一研究所 | A kind of high-power gas injector test method |
| CN109212998A (en) * | 2017-06-29 | 2019-01-15 | 苏州热工研究院有限公司 | A kind of nuclear power plant's check-valves different flow operating condition flow resistance coefficient analogy method and system |
| CN109212998B (en) * | 2017-06-29 | 2021-06-04 | 苏州热工研究院有限公司 | Flow resistance coefficient simulation method and system for check valve of nuclear power plant under different flow working conditions |
| CN110296826A (en) * | 2019-05-14 | 2019-10-01 | 玉环市国达阀门有限公司 | A kind of inflation valve detection device |
| CN113049253A (en) * | 2019-12-10 | 2021-06-29 | 中国航发商用航空发动机有限责任公司 | Nozzle simulation device and fuel system experiment platform |
| CN113049253B (en) * | 2019-12-10 | 2023-08-04 | 中国航发商用航空发动机有限责任公司 | Nozzle simulation device and fuel system experiment platform |
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Application publication date: 20130501 |