CN103674541B - A kind of valve for pressure difference performance test methods - Google Patents
A kind of valve for pressure difference performance test methods Download PDFInfo
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- CN103674541B CN103674541B CN201310754776.8A CN201310754776A CN103674541B CN 103674541 B CN103674541 B CN 103674541B CN 201310754776 A CN201310754776 A CN 201310754776A CN 103674541 B CN103674541 B CN 103674541B
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Abstract
The invention provides a kind of valve for pressure difference performance test methods, belong to valve for pressure difference detection technique field. It solves valve for pressure difference performance test not in accurate problem. This valve for pressure difference performance test methods key step is as follows: A, determine and calculate the range of flow under tested valve for pressure difference control pressure reduction, determine and calculate tested valve for pressure difference and respectively control the valve for pressure difference operting differential pressure scope that pressure difference is corresponding, determining tested operting differential pressure test value and flow rate test value under each tested valve for pressure difference control pressure difference Δ P; B, measure the system control pressure reduction of the corresponding flow rate test values of all valve for pressure difference control pressure difference Δ P sections and valve for pressure difference operting differential pressure test value; The relative error of the system control pressure reduction of C, computation and measurement; D, judge valve for pressure difference performance. When the method changes according to flow, pressure-drop in pipeline is changing, and controls pressure reduction and is also changing, and controls the relative error of pressure reduction carry out precise evaluation valve for pressure difference performance by calculating.
Description
Technical field
The invention belongs to valve for pressure difference detection technique field, relate to a kind of valve for pressure difference performance test methods.
Background technology
Valve for pressure difference full name is self-balanced differential pressure valve, and it does not need the external energy, relies on and is adjusted mediumSelf pressure changes and automatically adjusts, and residual head and the pressure oscillation of automatically eliminating pipeline causeFlow deviation, constant user's inlet outlet pressure differential. Valve for pressure difference is specially adapted to household metering or automaticIn control system, contribute to systems stabilisation operation. The current application of valve for pressure difference is very extensive,All can there is application very widely in factory, in building the system such as heating, air-conditioning of family even. PressThe application of difference limen can reduce a large amount of investments of controlling supplementary energy equipment that is applied to. The property of valve for pressure differenceCan completely in actual quoting, there is great meaning. And for the performance measurement of valve for pressure difference in systemTo detect valve for pressure difference in system, can effectively apply with the application efficiency playing whether meet industryStandard. The judgement of the practical application to valve for pressure difference and follow-up adjustment all have meaning very much.
Chinese patent literature discloses a kind of SMART FLUID control that application number is 201110457685.9The testboard of valve processed and detection method thereof. The method is within the scope of 0-100% valve opening, with 5%For unit etc. sets up test point separately; By the tested valve opening of PLC controller system control, in each inspectionMeasuring point records flow value Q, the valve two ends differential pressure pickup that electromagnetic flowmeter obtains more and obtainsPressure difference Δ P; Go out corresponding stream under the different valve openings of each test point according to calculated with mathematical modelCoefficient of discharge, and the flow value measured obtained with electromagnetic flowmeter compare and get difference, chooses instituteThere is that control accuracy as tested valve maximum in difference. This detection method is journey necessarilyTest pressure differential valve performance on degree, has considered that valve opening is for flow but the method has been independentThe impact of coefficient, does not consider that testing valve corresponding pipeline in the time of system pipeline changes in flow rate pressesFall and changing, valve for pressure difference pressure reduction is also changing. Therefore this method of testing is for accurate assessmentAlso inapplicable in valve precision.
Summary of the invention
The present invention is directed to existing technology and have the problems referred to above, proposed a kind of valve for pressure difference performance testMethod, when the method changes according to flow, pressure-drop in pipeline is changing, and controls pressure reduction and is also sending outChanging, carrys out precise evaluation valve for pressure difference performance by calculating relative error.
The present invention realizes by following technical proposal: a kind of valve for pressure difference performance test methods, its spyLevy and be, key step is as follows:
A, determine tested operting differential pressure test value and stream under each tested valve for pressure difference control pressure difference Δ PAmount test value:
Determine range of flow under tested valve for pressure difference control pressure difference and corresponding valve for pressure difference operting differential pressureScope; Each tested valve for pressure difference control pressure difference Δ P section, corresponding valve for pressure difference control pressure reduction section is rightShould within the scope of tested valve for pressure difference operting differential pressure, evenly choose some operting differential pressure test values and corresponding testedValve for pressure difference control pressure reduction section is evenly chosen some flow rate test values in range of flow, and described is someOperting differential pressure test value at least comprises the minimum work under corresponding tested valve for pressure difference control pressure difference Δ PPressure reduction and maximum differential pressure, described some flow rate test values comprise corresponding tested valve for pressure difference control pressure differenceMinimum discharge under Δ P and maximum stream flow;
B, measure the corresponding flow rate test values of all valve for pressure difference control pressure difference Δ P sections and valve for pressure difference workThe system control pressure reduction of pressure reduction test value:
Each tested valve for pressure difference control pressure difference Δ P section, when setting measurement, above-mentioned valve for pressure difference control is pressedThe flow rate test value of difference DELTA P section correspondence regulates operting differential pressure test value simultaneously, surveys one by one respectivelyMeasure and record each pressure measurement difference limen control pressure difference Δ P section, all measuring flow test values exist respectivelyThe all system control pressure differential deltap Ps that have differential manometer to measure under all operting differential pressure test values, eachTested valve for pressure difference control pressure difference Δ P section, at least at maximum stream flow, minimum differntial pressure valve operting differential pressureUnder measuring system control pressure reduction and system control when minimum discharge, maximum differential pressure valve operting differential pressurePressure differential deltap Ps;
The relative error of the system control pressure reduction of C, computation and measurement: according to each valve for pressure difference control pressure reductionThe relative error of all system control pressure differential deltap Ps computing system control pressure reduction that section measures;
D, judge valve for pressure difference performance: what each tested valve for pressure difference control pressure differential deltap P section calculated isSystem is controlled the relative error T of pressure reductionΔPCompare with established standards value, all system control is pressedPoor relative error TΔPBe less than established standards value for normal, and same tested valve for pressure difference is measuredThe system control pressure reduction relative error of all pressure measurement difference limen control pressure differential deltap P section correspondences close to each otherFor excellent.
According to the operation principle of differential valve, this performance test methods is according to the control of tested valve for pressure difference selfThe poor ability of superzapping evenly chooses and sets flow in corresponding range of flow, is setting flow simultaneouslyIn constant situation, regulate valve for pressure difference operting differential pressure, measure corresponding valve for pressure difference control pressure reduction with thisLower system control pressure reduction, system control pressure reduction now at least comprises valve for pressure difference control pressure difference correspondenceRange of flow in and valve for pressure difference operting differential pressure within the scope of minimum system control pressure reduction and maximum systemControl pressure reduction. In the time measuring a selected valve for pressure difference control pressure difference, set flow, at full streamIn weight range, evenly segmentation is chosen one by one, and the flow that while specifically measurement, selected flow section is set is motionless,Regulate operting differential pressure by gamut, measure under corresponding valve for pressure difference control pressure difference in this range of flowThe changing value of the system control pressure reduction in valve for pressure difference operting differential pressure. Gamut variable flow so one by one,Gamut changes operting differential pressure, reaches comprehensive reflection and detects the relative mistake of controlling pressure reduction under different conditionThe poor performance quality that judges tested valve for pressure difference. Thereby the Performance Evaluation that makes valve for pressure difference is more rigorous,Accurately.
In above-mentioned valve for pressure difference performance test methods, in described steps A, describedly determine and calculateRange of flow under tested valve for pressure difference control pressure reduction, measures valve for pressure difference flow coefficient k vs: valve for pressure difference is twoIt is full-gear that flap is fixed on maximum opening, when valve for pressure difference control pressure difference is controlled at 0.1MPa,The flow that valve for pressure difference is now flow through in measurement is Kvs;
The maximum stream flow Qmax that determines the corresponding valve for pressure difference control pressure difference of measuring is:When calculating, △ P is Bar unit by MPa Conversion of measurement unit, 1Bar=0.1MPa;
The minimum discharge Qmin that determines the corresponding valve for pressure difference control pressure difference of measuring is:Qmin＝1/R×Qmax；
Wherein, the control pressure difference that △ P is tested valve for pressure difference; R is regulating ratio, described regulating ratio RBe 10.
Here be the setting that pilot valve carries out valve for pressure difference control pressure reduction by regulating valve for pressure difference Double-clack, establishPut flow when valve for pressure difference is maximum controls pressure reduction 0.1MPa, i.e. maximum stream flow coefficient, is follow-up correspondenceDefinite foundation that provides of the range of flow under valve for pressure difference control pressure reduction. Here according to formula with to KvsMeasurement can calculate range of flow corresponding to tested valve for pressure difference control pressure differential deltap P.
In above-mentioned valve for pressure difference performance test methods, in described steps A, determine tested valve for pressure differenceEach valve for pressure difference operting differential pressure scope corresponding to pressure difference of controlling:
According to the tested valve for pressure difference operting differential pressure of maximum be: 0.35Mpa～0.3Mpa;
Minimum tested valve for pressure difference operting differential pressure is: equal tested valve for pressure difference control pressure difference Δ P;
Determine and calculate tested valve for pressure difference according to aforesaid way and respectively control the valve for pressure difference that pressure difference is correspondingOperting differential pressure scope. Here respectively control for definite tested valve for pressure difference the valve for pressure difference work that pressure difference is correspondingMake pressure differential range.
In above-mentioned valve for pressure difference performance test methods, in described steps A, wherein tested valve for pressure differenceControl pressure differential deltap P and be 0.02,0.04,0.06,0.08,0.1}, unit is MPa; By pressure measurementThe range of flow that difference limen control pressure differential deltap P is corresponding is RightAnswer valve for pressure difference operting differential pressure scope for 0.02～0.35,0.04～0.35,0.06～0.35,0.08～0.35，0.1～0.35}。
The control pressure differential deltap P of valve for pressure difference self carries out segmentation according to valve for pressure difference characteristic, makes it possible to completeFace is tested the valve for pressure difference control differential pressure conditions of each section, makes more closing to reality application of measurement data.Determine one to one range of flow and valve for pressure difference work pressure with above-mentioned valve for pressure difference control pressure differential deltap PPoor scope to determine and choose flow rate test under valve for pressure difference control pressure differential deltap P in corresponding scopeValue and valve for pressure difference operting differential pressure test value.
In above-mentioned valve for pressure difference performance test methods, described definite valve for pressure difference operting differential pressure testValue and flow rate test value, by the minimum differntial pressure under the tested valve for pressure difference control of correspondence pressure difference Δ PBetween valve operting differential pressure and maximum differential pressure, get median as valve for pressure difference operting differential pressure measuring basis numberAccording to, described minimum discharge under the tested valve for pressure difference control of correspondence pressure difference Δ P and maximum stream flow itBetween get median and do Flow datum measurement data,
Wherein, 1. regulate the pilot valve of valve for pressure difference to make tested valve for pressure difference control pressure difference in corresponding Δ PSection;
2. on regulating system pipeline, corresponding pressure regulator valve is set flow and is reached corresponding flow rate test value;
3. on regulating system pipeline, corresponding control valve regulates valve for pressure difference operting differential pressure to reach corresponding pressureDifference limen operting differential pressure.
Here can select easily pressure reduction test value and flow model within the scope of valve for pressure difference operting differential pressureEnclose interior flow rate test value and be evenly comprehensively choose more accurately valve for pressure difference operting differential pressure test value andFlow rate test value.
In above-mentioned valve for pressure difference performance test methods, in described step C, it is characterized in that instituteState the system control pressure reduction actual value Δ Ps calculating that each tested valve for pressure difference control pressure differential deltap P section is measuredArithmetic mean of instantaneous value obtains Δ Pp, system control pressure reduction relative error
In above-mentioned valve for pressure difference performance test methods, described in the tested valve for pressure difference that calculates allThe system control pressure reduction relative error T of valve for pressure difference control pressure reduction section correspondenceΔPMuch smaller than or be greater than settingWhen standard value, adjust range of flow and pressure differential range, again measure. When finally calculatingSystem control pressure reduction relative error TΔPWhile differing greatly from the standard value of setting, corresponding valve for pressure differenceRange of flow under control pressure reduction and pressure differential range are chosen wrong, after need adjusting, again surveyAmount, the accuracy of guarantee measurement data.
In above-mentioned valve for pressure difference performance test methods, described system control pressure reduction relative error TΔPDuring much larger than established standards value, dwindle range of flow and valve for pressure difference operting differential pressure scope the upper limit or underLimit; System control pressure reduction relative error TΔPDuring much smaller than established standards value, expand range of flowThe upper limit or lower limit with valve for pressure difference operting differential pressure scope. At system control pressure reduction relative error TΔPFarWhile being greater than and being less than established standards value, adjust range of flow and valve for pressure difference operting differential pressure scope is contraryProcess, the measurement result again making can not depart from measurement category, thereby causes excessive error.
In above-mentioned valve for pressure difference performance test methods, in described step F, described established standards valueFor 7%-8%. Here established standards value is according to the management industry standard of valve for pressure difference practicality or enterprise's markStandard is set, for assessment of the quality of valve for pressure difference performance.
In above-mentioned valve for pressure difference performance test methods, the stream of described valve for pressure difference control pressure reduction section correspondenceFlow rate test value in weight range, valve for pressure difference operting differential pressure test value, the system control pressure reduction recordingAnd system control pressure reduction relative error is set up form one to one. Can be more by setting up formGet information about the corresponding data that detect and measure of each valve for pressure difference control pressure reduction section, simultaneously also convenientRecord shelves, calculating and statistics.
Compared with prior art, this valve for pressure difference performance test methods has the following advantages:
1, the present invention is according to valve for pressure difference operation principle, set flow that valve for pressure difference control pressure reduction is corresponding andSet up valve for pressure difference operting differential pressure and measure the system control pressure of each valve for pressure difference control pressure reduction section correspondencePoor, and the relative error of computing system control pressure reduction, and judge the relative error of system control pressure reductionAssess valve for pressure difference performance, range of flow and the pressure of each the control pressure reduction section of this method to valve for pressure differenceDifference limen operting differential pressure scope can measure comprehensively, and measurement category is comprehensive, makes this performance test sideMethod precision is improved.
2, the present invention is at least measured and is set as flow minimum of a value by each valve for pressure difference control pressure reduction sectionThe controlled pressure reduction maximum of system control pressure reduction during with valve for pressure difference operting differential pressure maximum, simultaneouslyMeasuring system control pressure reduction in the time setting flow maximum and valve for pressure difference operting differential pressure minimum of a value obtainsControl pressure reduction minimum of a value. Measure the mode of twice by minimum thus and the most just can calculate system controlThe poor relative error of superzapping. The present invention also has the object of fast detecting valve for pressure difference performance as can be seen here.
Brief description of the drawings
Fig. 1 is step block diagram of the present invention;
Fig. 2 is valve for pressure difference performance testing device;
Fig. 3 is valve for pressure difference control pressure reduction, the valve for pressure difference work of arriving that DN65 valve for pressure difference is for example calculatedThe corresponding table of pressure differential range and range of flow.
In figure, 1, pressure regulator valve; 2, differential manometer one; 3, valve for pressure difference; 4, differential manometer two; 5, adjustJoint valve one; 6, control valve two; 7, flowmeter
Detailed description of the invention
Below specific embodiments of the invention, and by reference to the accompanying drawings to technical scheme of the present invention do intoThe description of one step, but the present invention is not limited to these embodiment.
As Figure 1-3, a kind of valve for pressure difference performance test methods, is characterized in that key stepAs follows:
A, determine and calculate the range of flow under tested valve for pressure difference control pressure reduction:
Measure valve for pressure difference flow coefficient k vs: it is standard-sized sheet shape that valve for pressure difference Double-clack is fixed on maximum openingState, when valve for pressure difference control pressure difference is controlled at 0.1MPa, the flow that valve for pressure difference is now flow through in measurement isKvs。
And according to the control pressure difference of the flow coefficient k V of flow value Q, valve for pressure difference and tested valve for pressure differenceΔ P hasRelation calculate tested valve for pressure difference and respectively control the flow that pressure difference is correspondingScope;
The maximum stream flow Qmax that determines the corresponding valve for pressure difference control pressure difference of measuring is:When calculating, △ P is Bar unit by MPa Conversion of measurement unit, 1Bar=0.1MPa;
The minimum discharge Qmin that determines the corresponding valve for pressure difference control pressure difference of measuring is:Qmin＝1/R×Qmax；
Wherein, the control pressure difference that △ P is tested valve for pressure difference; R is regulating ratio, described regulating ratio RGet 10.
Determine and calculate tested valve for pressure difference and respectively control the valve for pressure difference operting differential pressure scope that pressure difference is corresponding:
Wherein tested valve for pressure difference control pressure differential deltap P be 0.02,0.04,0.06,0.08,0.1},Unit is MPa.
According to the tested valve for pressure difference operting differential pressure of maximum be: 0.35Mpa～0.3Mpa;
Minimum tested valve for pressure difference operting differential pressure is: equal tested valve for pressure difference control pressure difference Δ P;
Determine and calculate tested valve for pressure difference according to aforesaid way and respectively control the valve for pressure difference that pressure difference is correspondingOperting differential pressure scope:
Range of flow corresponding to tested valve for pressure difference control pressure differential deltap P is Corresponding valve for pressure difference operting differential pressure scope be 0.02～0.35,0.04～0.35,0.06～0.35,0.08～0.35，0.1～0.35}。
Under fixed each tested valve for pressure difference control pressure difference Δ P, tested operting differential pressure test value and flow are surveyedExamination value: each tested valve for pressure difference control pressure difference Δ P section, corresponding valve for pressure difference control pressure reduction section is rightShould within the scope of tested valve for pressure difference operting differential pressure, evenly choose some operting differential pressure test values and corresponding testedValve for pressure difference control pressure reduction section is evenly chosen some flow rate test values in range of flow, and described is someOperting differential pressure test value at least comprises the minimum work under corresponding tested valve for pressure difference control pressure difference Δ PPressure reduction and maximum differential pressure, described some flow rate test values comprise corresponding tested valve for pressure difference control pressure differenceMinimum discharge under Δ P and maximum stream flow;
Definite valve for pressure difference operting differential pressure test value and flow rate test value, by the tested pressure reduction of correspondenceBetween minimum differntial pressure valve operting differential pressure under valve control pressure difference Δ P and maximum differential pressure, getting median doesFor valve for pressure difference operting differential pressure measuring basis data, described at the tested valve for pressure difference control of correspondence pressure difference Δ PUnder minimum discharge and maximum stream flow between get median and do Flow datum measurement data.
B, measure the corresponding flow rate test values of all valve for pressure difference control pressure difference Δ P sections and valve for pressure difference workThe system control pressure reduction of pressure reduction test value:
Each tested valve for pressure difference control pressure difference Δ P section, when setting measurement, above-mentioned valve for pressure difference control is pressedThe flow rate test value of difference DELTA P section correspondence regulates operting differential pressure test value simultaneously, surveys one by one respectivelyMeasure and record each pressure measurement difference limen control pressure difference Δ P section, all measurement test values are respectively allOperting differential pressure test value under have differential manometer measure all system control pressure differential deltap Ps, each testedValve for pressure difference control pressure difference Δ P section, at least under maximum stream flow, minimum differntial pressure valve operting differential pressureSystem control pressure reduction when measuring system control pressure reduction and minimum discharge, maximum differential pressure valve operting differential pressureΔPs
Wherein, 1. regulate the pilot valve of valve for pressure difference to make tested valve for pressure difference control pressure difference in corresponding Δ PSection;
2. on regulating system pipeline, corresponding pressure regulator valve is set flow and is reached corresponding flow rate test value;
3. on regulating system pipeline, corresponding control valve regulates valve for pressure difference operting differential pressure to reach corresponding pressureDifference limen operting differential pressure;
The relative error of the system control pressure reduction of E, computation and measurement: each tested valve for pressure difference control pressure reductionThe system control pressure reduction actual value Δ Ps that Δ P section is measured calculates arithmetic mean of instantaneous value and obtains Δ Pp, systemControl pressure reduction relative error Wherein,Δ Psmax is the maximum system control pressure reduction of the system control pressure differential deltap Ps that records under corresponding Δ P,Δ Psmax is minimum system control pressure reduction; Calculate each tested valve for pressure difference control according to above-mentioned formulaThe relative error T of pressure differential deltap P section system control pressure reduction processedΔP；
C, judge valve for pressure difference performance: what each tested valve for pressure difference control pressure differential deltap P section calculated isSystem is controlled the relative error T of pressure reductionΔPCompare with established standards value, all system control is pressedPoor relative error TΔPBe less than established standards value for normal, and same tested valve for pressure difference is measuredThe system control pressure reduction relative error of all pressure measurement difference limen control pressure differential deltap P section correspondences close to each otherFor excellent. Established standards value is 7%-8%. In following examples, there is the statement that relates to established standardsWith 8% as an example. In real work, can select 7%-8%.
Flow rate test value, valve for pressure difference work in the range of flow of valve for pressure difference control pressure reduction section correspondence are pressedPoor test value, the system control pressure reduction recording and system control pressure reduction relative error are set up corresponding one by oneForm.
The system control pressure reduction of all valve for pressure difference control of the tested valve for pressure difference pressure reduction section correspondence calculatingRelative error TΔPMuch smaller than or while being greater than established standards value, adjust flow and pressure differential range, carry outAgain measure. System control pressure reduction relative error TΔPDuring much larger than established standards value, dwindle flowThe upper limit or the lower limit of scope and valve for pressure difference operting differential pressure scope; System control pressure reduction relative error TΔPDuring much smaller than established standards value, expand range of flow and valve for pressure difference operting differential pressure scope the upper limit orLower limit.
Below exemplifying valve for pressure difference model is comprehensive measuring system control pressure reduction of DN65 and the side of assessmentFormula: if valve for pressure difference in Fig. 23 is as tested valve for pressure difference, its valve for pressure difference performance testing device as figure,Wherein the Kvs of DN65 valve for pressure difference is 40M3/ H is known, surveys each valve for pressure difference control pressure reduction section and is pressingVariation within the scope of difference limen operting differential pressure determines that with the variation in range of flow system control pressure reduction is relativeThe step of error:
The pressure difference that the P2-P3 that in figure, differential manometer 24 is measured is ordered is valve for pressure difference operting differential pressure: effectIn control valve two ends, make control valve can normally realize the pressure reduction of pressure reduction control function.
The pressure difference that the P1-P2 that differential manometer 1 is measured is ordered is system control pressure reduction: at control valveUnder control action, the pressure reduction of controlled loop.
Taking the Kvs of DN65 valve for pressure difference as 40M3/ H is the pressure reduction arriving that example is calculated according to above-mentioned formulaValve control pressure reduction, valve for pressure difference operting differential pressure scope and range of flow result as shown in Figure 3, in Fig. 3A form represents: taking the Kvs of DN65 valve for pressure difference as 40M3Under the corresponding valve for pressure difference control of/H pressure reductionRange of flow, the b form in Fig. 3 represents: taking the Kvs of DN65 valve for pressure difference as 40M3/ H correspondenceValve for pressure difference operting differential pressure scope under valve for pressure difference control pressure reduction.
Can determine the flow rate test of each valve for pressure difference control pressure reduction section according to the form on Fig. 3 simultaneouslyValue and valve for pressure difference operting differential pressure test value are as follows:
By regulating the control pressure reduction section of the pilot valve setting current differential pressure valve in valve for pressure difference, pass through simultaneouslyRegulating pressure regulator valve 1 to set needs the down-off of working as of measurement, and by regulating control valve 1 and adjustingJoint valve 26 is set the operting differential pressure of valve for pressure difference. Concrete data are as follows:
0.02 section of a, initial pressure difference valve control pressure reduction, flow rate test value is respectively: 18,16,14,12,10,8,6,4,2}. Above-mentionedly get 2 1.79, maximum stream flow 0.02 section of minimum discharge17.89 get 18 centres is getting even positive number value.
(1) setting flow is 10M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reductionMeasuring basis data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys1～ΔPs7}。
(2) setting flow is 12M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reductionMeasuring basis data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys8～ΔPs14}。
(3) setting flow is 14M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reductionMeasuring basis data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys15～ΔPs21}。
(4) setting flow is 16M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reductionMeasuring basis data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys22～ΔPs28}。
(5) setting flow is 18M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reductionMeasuring basis data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys29～ΔPs35}。
(6) setting flow is 8M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reduction surveyAmount reference data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys36～ΔPs42}。
(7) setting flow is 6M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reduction surveyAmount reference data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys43～ΔPs49}。
(8) setting flow is 4M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reduction surveyAmount reference data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys50～ΔPs56}。
(9) setting flow is 2M3/ H; Valve for pressure difference operting differential pressure 0.15Mpa is 0.2 section and controls pressure reduction surveyAmount reference data. Valve for pressure difference operting differential pressure test value be respectively 0.02,0.04,0.1,0.15,0.25,0.3,0.35} measurement-recording system control pressure reduction actual value { Δ P respectivelys58～ΔPs63}。
(10) calculate the relative error of controlling pressure reduction:
ΔPsP in presentation graphs 21To P2The system control pressure difference measured for test of pressure reduction;
ΔPPRepresent test measure for all system control pressure differences under valve for pressure difference control pressure reductionArithmetic mean of instantaneous value; Be that the arithmetic mean of instantaneous value that above-mentioned test value obtains can be expressed as
ΔPP=（ΔPs1+ΔPs2+……ΔPs63）/63
Simultaneously according to formula ObtainT0.02Time system control pressure reduction relative error.
(11) reference data, according to T0.2Size adjustment is dwindled or is expanded range of flow and valve for pressure difference workPressure differential range, T0.28% of > > suitably dwindle range of flow and operting differential pressure scope the upper limit or underLimit; T0.28% of < < suitably expands the upper limit or the lower limit of range of flow and operting differential pressure scope, entersRow is measured again, if there is not above-mentioned situation, it is correct making above-mentioned measurement data clear.
27,24,21,18 0.04 section of b, valve for pressure difference control pressure reduction, flow measurement is segmented into:,15,12,9,6,3. Regulate as stated above successively valve for pressure difference operting differential pressure to measure and calculateSystem control pressure reduction relative error T under this valve for pressure difference control pressure reduction section0.04。
30,27,24,21 0.06 section of c, valve for pressure difference control pressure reduction, flow measurement is segmented into:,18,15,12,9,6,3. Regulate as stated above successively valve for pressure difference operting differential pressure to measure alsoCalculate the system control pressure reduction relative error T under this valve for pressure difference control pressure reduction section0.06。
Calculate successively the system control of 0.08 section of valve for pressure difference control pressure reduction and 0.1 section by above-mentioned modePressure reduction relative error T0.08And T0.1. What wherein above-mentioned any valve for pressure difference control pressure reduction section calculated isSystem is controlled pressure reduction relative error all to be needed as T0.02The relative reference data of Shi Jinhang judges,Whether whether the data of calculate and measurement meet requirement of experiment, have distortion phenomenon to occur.
Can set up as required relevant differential valve inlet pressure P for above-mentioned comprehensive metering system2, poorPressure valve outlet pressure P3, flow Q, Δ PsWith Δ PPAnd the relative error T of system control pressure reductionΔPSet up corresponding form. Realize the object of clear management and Measurement accuracy.
The object that simultaneously wants to realize fast detecting only needs a minimum measurement realize system control for twiceThe measurement of pressure reduction, principle is that under each valve for pressure difference control pressure reduction, system control pressure reduction is surveyed in flow minimumWhen examination value and valve for pressure difference operting differential pressure full test value, reach maximum; System control pressure reduction is at flowWhen test value maximum and valve for pressure difference operting differential pressure test value minimum of a value, reach minimum of a value.
Therefore regulate the pilot valve of valve for pressure difference to set valve for pressure difference control pressure reduction section, with 1/2Kvmax flow and1/2（P2-P3）maxOperting differential pressure, setup control differential pressure measurement benchmark.
Flow set minimum of a value Kvmin and operting differential pressure are set maximum (P2-P3）max, measure notePressure reduction maximum Δ P is controlled in recordmax；
Flow set maximum Kvmax and operting differential pressure are set minimum of a value (P2-P3）min, measure notePressure reduction minimum of a value Δ P is controlled in recordmin；
⑷ΔPP=1/2（ΔPmax+ΔPmin）
(5) calculate the relative error of controlling pressure reduction:
(6) reference data, finishing analysis data, according to TΔPSize adjustment is dwindled or is expanded flow modelEnclose and operting differential pressure scope, TΔP8% of > > suitably dwindles range of flow and operting differential pressure scopeThe upper limit or lower limit; TΔP8% of < < suitably expand range of flow and operting differential pressure scope the upper limit orLower limit.
According to above-mentioned principle valve for pressure difference control pressure reduction 0.02,0.04,0.06,0.08,0.1}Section is carried out respectively the calculating of system control pressure reduction relative error.
The system control pressure reduction obtaining in the control pressure reduction section any section of tested valve for pressure difference is less than sets markAccurate value reaches standard normal pressure difference valve while being 8%. The system of correspondence under any section valve for pressure difference control pressure reductionControl pressure reduction relative error more approaching better.
Below operation principle of the present invention:
According to the operation principle of differential valve, this performance test methods is according to the control of tested valve for pressure difference selfThe poor ability of superzapping evenly chooses and sets flow in corresponding range of flow, is setting flow simultaneouslyIn constant situation, regulate valve for pressure difference operting differential pressure, measure corresponding valve for pressure difference control pressure reduction with thisLower system control pressure reduction, system control pressure reduction now at least comprises valve for pressure difference control pressure difference correspondenceRange of flow in and valve for pressure difference operting differential pressure within the scope of minimum system control pressure reduction and maximum systemControl pressure reduction. In the time measuring a selected valve for pressure difference control pressure difference, set flow, at full streamIn weight range, evenly segmentation is chosen one by one, and the flow that while specifically measurement, selected flow section is set is motionless,Regulate operting differential pressure by gamut, measure under corresponding valve for pressure difference control pressure difference in this range of flowThe changing value of the system control pressure reduction in valve for pressure difference operting differential pressure. Gamut variable flow so one by one,Gamut changes operting differential pressure, reaches comprehensive reflection and detects the relative mistake of controlling pressure reduction under different conditionThe poor performance quality that judges tested valve for pressure difference. Thereby the Performance Evaluation that makes valve for pressure difference is more rigorous,Accurately. This method can, by manually realizing, can realize by automation equipment simultaneouslyThis method. Realize the automatic control and adjustment of carrying out to valve for pressure difference, control valve, pressure regulator valve, then connectThe measurement numerical value of receiving differential manometer 1, differential manometer 24 and flowmeter 7 etc. obtains according to this methodSystem control pressure reduction relative error, and the performance quality of the tested valve for pressure difference of automatization judgement, this deviceThe device of quoting with background technology also can be realized.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit. SimultaneouslyThe valve for pressure difference of a kind of model of use in figure and in embodiment is given an example, and the present invention can realize arbitrarilyThe above-mentioned performance test of valve for pressure difference, simultaneously can flow rate test value and valve for pressure difference test value in the time of testCan within the scope of corresponding range of flow and valve for pressure difference, carry out even segmentation and choose, embodiment exemplifiesTwo kinds of modes are wherein two kinds, in test process, can select as required. ThisBright person of ordinary skill in the field can do various repairing to described specific embodimentChange or supplement or adopt similar mode to substitute, but can't depart from spirit of the present invention or surmountThe defined scope of appended claims.
Although more used pressure regulator valve 1, differential manometer 1, valve for pressure difference 3, differential manometer two herein4, the term such as control valve 1, control valve 26, flowmeter 7, uses other art but do not get rid ofThe possibility of language. Use these terms to be only used to describe more easily and explain of the present inventionMatter; They are construed to any additional restriction is all contrary with spirit of the present invention.
Claims (10)
1. a valve for pressure difference performance test methods, is characterized in that, key step is as follows:
A, determine tested operting differential pressure test value and stream under each tested valve for pressure difference control pressure difference Δ PAmount test value:
Determine range of flow under tested valve for pressure difference control pressure difference and corresponding valve for pressure difference operting differential pressureScope; Each tested valve for pressure difference control pressure difference Δ P section, corresponding valve for pressure difference control pressure reduction section is rightShould within the scope of tested valve for pressure difference operting differential pressure, evenly choose some operting differential pressure test values and corresponding testedValve for pressure difference control pressure reduction section is evenly chosen some flow rate test values in range of flow, and described is someOperting differential pressure test value at least comprises the minimum work under corresponding tested valve for pressure difference control pressure difference Δ PPressure reduction and maximum differential pressure, described some flow rate test values comprise corresponding tested valve for pressure difference control pressure differenceMinimum discharge under Δ P and maximum stream flow;
B, measure the corresponding flow rate test values of all valve for pressure difference control pressure difference Δ P sections and valve for pressure difference workThe system control pressure reduction of pressure reduction test value:
Each tested valve for pressure difference control pressure difference Δ P section, when setting measurement, above-mentioned valve for pressure difference control is pressedThe flow rate test value of difference DELTA P section correspondence regulates operting differential pressure test value simultaneously, surveys one by one respectivelyMeasure and record each pressure measurement difference limen control pressure difference Δ P section, all measuring flow test values exist respectivelyThe all system control pressure differential deltap Ps that have differential manometer to measure under all operting differential pressure test values, eachTested valve for pressure difference control pressure difference Δ P section, at least at maximum stream flow, minimum differntial pressure valve operting differential pressureUnder measuring system control pressure reduction and system control when minimum discharge, maximum differential pressure valve operting differential pressurePressure differential deltap Ps;
The relative error of the system control pressure reduction of C, computation and measurement: according to each valve for pressure difference control pressure reductionThe relative error of all system control pressure differential deltap Ps computing system control pressure reduction that section measures;
D, judge valve for pressure difference performance: what each tested valve for pressure difference control pressure differential deltap P section calculated isSystem is controlled the relative error T of pressure reductionΔPCompare with established standards value, all system control is pressedPoor relative error TΔPBe less than established standards value for normal, and same tested valve for pressure difference is measuredThe system control pressure reduction relative error of all pressure measurement difference limen control pressure differential deltap P section correspondences close to each otherFor excellent.
2. valve for pressure difference performance test methods according to claim 1, is characterized in that, described inIn steps A, describedly determine and calculate the range of flow under tested valve for pressure difference control pressure reduction, measuring pressure reductionValve flow coefficient k vs: it is full-gear that valve for pressure difference Double-clack is fixed on maximum opening, valve for pressure difference controlWhen pressure difference is controlled at 0.1MPa, the flow that valve for pressure difference is now flow through in measurement is Kvs;
The maximum stream flow Qmax that determines the corresponding valve for pressure difference control pressure difference of measuring is:When calculating, △ P is Bar unit by MPa Conversion of measurement unit, 1Bar=0.1MPa;
The minimum discharge Qmin that determines the corresponding valve for pressure difference control pressure difference of measuring is:Qmin＝1/R×Qmax；
Wherein, the control pressure difference that △ P is tested valve for pressure difference; R is regulating ratio, described regulating ratio RBe 10.
3. valve for pressure difference performance test methods according to claim 2, is characterized in that, described inIn steps A, determine that tested valve for pressure difference respectively controls the valve for pressure difference operting differential pressure scope that pressure difference is corresponding:
According to the tested valve for pressure difference operting differential pressure of maximum be: 0.35Mpa～0.3Mpa;
Minimum tested valve for pressure difference operting differential pressure is: equal tested valve for pressure difference control pressure difference Δ P;
Determine and calculate tested valve for pressure difference according to aforesaid way and respectively control the valve for pressure difference that pressure difference is correspondingOperting differential pressure scope.
4. valve for pressure difference performance test methods according to claim 3, is characterized in that, described inIn steps A, wherein tested valve for pressure difference control pressure differential deltap P be 0.02,0.04,0.06,0.08,0.1}, unit is MPa; Range of flow corresponding to described tested valve for pressure difference control pressure differential deltap P is Corresponding valve for pressure difference operting differential pressure scope be 0.02～0.35，0.04～0.35，0.06～0.35，0.08～0.35，0.1～0.35}。
5. according to the valve for pressure difference performance test methods described in any one in claim 1-4, itsBe characterised in that, in described steps A, described definite valve for pressure difference operting differential pressure test value and flow are surveyedExamination value, by the minimum differntial pressure valve operting differential pressure under the tested valve for pressure difference control of correspondence pressure difference Δ PAnd between maximum differential pressure, get median as valve for pressure difference operting differential pressure measuring basis data, described rightBetween minimum discharge under should tested valve for pressure difference control pressure difference Δ P and maximum stream flow, getting median doesFlow datum measurement data,
Wherein, 1. regulate the pilot valve of valve for pressure difference to make tested valve for pressure difference control pressure difference in corresponding Δ PSection;
2. on regulating system pipeline, corresponding pressure regulator valve is set flow and is reached corresponding flow rate test value;
3. on regulating system pipeline, corresponding control valve regulates valve for pressure difference operting differential pressure to reach corresponding pressureDifference limen operting differential pressure.
6. valve for pressure difference performance test methods according to claim 5, in step C, its featureBe the system control pressure reduction actual value that described each tested valve for pressure difference control pressure differential deltap P section is measuredΔ Ps calculates arithmetic mean of instantaneous value and obtains Δ Pp, system control pressure reduction relative error
Wherein, Δ Psmax is rightAnswer the maximum system control pressure reduction of the system control pressure differential deltap Ps recording under Δ P, Δ Psmax is forMini system control pressure reduction; Calculate each tested valve for pressure difference control pressure differential deltap P section according to above-mentioned formulaThe relative error T of system control pressure reductionΔP。
7. valve for pressure difference performance test methods according to claim 6, is characterized in that, described inThe system control pressure reduction of all valve for pressure difference control of the tested valve for pressure difference pressure reduction section correspondence calculating is relativeError TΔPMuch smaller than or while being greater than established standards value, adjust flow and pressure differential range, carry out againMeasure.
8. valve for pressure difference performance test methods according to claim 7, is characterized in that, described inSystem control pressure reduction relative error TΔPDuring much larger than established standards value, dwindle range of flow and pressure reductionThe upper limit or the lower limit of valve operting differential pressure scope; System control pressure reduction relative error TΔPMuch smaller than settingWhen standard value, expand the upper limit or the lower limit of range of flow and valve for pressure difference operting differential pressure scope.
9. valve for pressure difference performance test methods according to claim 8, is characterized in that, described inIn step D, described established standards value is 7%-8%.
10. valve for pressure difference performance test methods according to claim 1, is characterized in that, instituteState flow rate test value, valve for pressure difference operting differential pressure in the range of flow of valve for pressure difference control pressure reduction section correspondenceTest value, the system control pressure reduction recording and system control pressure reduction relative error are set up one to oneForm.
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| CN111999581B (en) * | 2020-08-14 | 2021-04-30 | 燕山大学 | Device and method for testing electromagnetic characteristics of small-flow electromagnetic switch valve |
| CN113933048A (en) * | 2021-10-26 | 2022-01-14 | 浙江瑞立空压装备有限公司 | Automatic detection method of differential pressure valve |
| CN114354179B (en) * | 2021-12-30 | 2023-09-26 | 哈尔滨哈控实业有限公司 | Balance valve testing system and method |
| CN114235386B (en) * | 2022-02-28 | 2022-05-13 | 艾肯（江苏）工业技术有限公司 | Test platform for verifying static pressure life of stop valve through fluid detection |
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| JPH09203793A (en) * | 1996-01-25 | 1997-08-05 | Toshiba Corp | Test method of main steam isolation valve |
| DE102004060077A1 (en) * | 2004-12-14 | 2006-07-06 | Continental Teves Ag & Co. Ohg | Circuit for hydraulic or pneumatic testing of valves, brake calipers, has low pressure meter connected to test line between shut-off valve, test connection, whose connection to test line is automatically isolated for high pressure testing |
| KR100713621B1 (en) * | 2006-07-10 | 2007-08-10 | 주식회사 한빛파워서비스 | Method for testing performance of current air driven type control valve |
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| CN102564753B (en) * | 2011-12-31 | 2015-09-23 | 杭州哲达科技股份有限公司 | A kind of test board of SMART FLUID operation valve and detection method |
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