CN101718347B - Design method of multi-orifice sleeve-type flow control valve and sleeve-type flow control valve - Google Patents
Design method of multi-orifice sleeve-type flow control valve and sleeve-type flow control valve Download PDFInfo
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- CN101718347B CN101718347B CN2009102417865A CN200910241786A CN101718347B CN 101718347 B CN101718347 B CN 101718347B CN 2009102417865 A CN2009102417865 A CN 2009102417865A CN 200910241786 A CN200910241786 A CN 200910241786A CN 101718347 B CN101718347 B CN 101718347B
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Abstract
The invention relates to a design method of a multi-orifice sleeve-type flow control valve and a sleeve-type flow control valve, in particular to design method of a sleeve-type flow control valve and a multi-orifice sleeve-type flow-adjusting valve designed by the design method of a sleeve-type flow control valve. The method comprises the following steps: calculating water head loss; calculating the sectional area of a cylindrical inner sluice of the flow control valve; calculating a resistance coefficient; calculating a corresponding relation between the dimensionless flow coefficient tau of an adjusting valve and the valve opening coefficient y of the adjusting valve; and calculating and confirming the parameters of orifices on the cylindrical inner sluice. The invention dents the characteristic curve of the dimensionless valve flow coefficient tau and the opening coefficient y to form an ideal flow control valve and can simply design the flow control valve to be designed in practice by adjusting the nominal diameter of the cylindrical inner sluice of the flow control valve and the distribution and the sizes of the orifices on the cylindrical inner sluice, thereby lightening the manufacture of the flow control valve by applying the prior process.
Description
Technical field
The present invention relates to telescopic flow-adjustable valve design method of a kind of many spray orifices and telescopic flow-adjustable valve, being design method and the equipment that is used for a kind of valve of water delivery engineering, is a kind of design method of telescopic flow-adjustable valve and the telescopic flow-adjustable valve of many spray orifices that uses described design method design.
Background technique
The birth of many spray orifice cover skeleton symbol flow-adjustable valves has had history (Miller, 1969 in 40 years; Burgi, 1977), in water delivery engineering, obtain extensive use at present.Many spray orifice cover skeleton symbol flow-adjustable valves have following advantage: 1. can be under the High Pressure Difference environment, and long-term nothing cavitation erosion operation; 2. can be omnidistance (by standard-sized sheet to complete shut-down) current-regulating voltage-regulating, transfer and flow the precision height, be generally inflow-rate of water turbine ± 0.5%; 3. do not have harmfulness noise and vibration, when being used for clear water, failure-free operation for a long time reaches 30-50 working life; 4. can adopt multiple modes such as electric power, hydraulic pressure to drive.Both can execute-in-place, also can distant place control; 5. energy dissipating, pressure relief ranges are wide, can adapt to the continuous variation of upstream head.Spray orifice on the sleeve of the existing telescopic flow-adjustable valve of many spray orifices is even distribution, and the diameter of all spray orifices is identical.The dimensionless valve flow coefficient of the telescopic flow-adjustable valve that even distribution of this spray orifice and injection diameter are identical
And aperture
Characteristic curve is linear, perhaps epirelief.Up-to-date studies show that, centering high head, long distance, large flow pipe road water delivery engineering, and it is that flow is with aperture when big aperture that the design of existing flow-adjustable valve characteristic exists the problem of water attack process control difficulty, its reason
Reduce change not quite, make the change of flow concentrate on little aperture, cause surge pressure excessive, perhaps the shut-in time is oversize and can't implement.
Summary of the invention
For overcoming the prior art problem, the present invention proposes telescopic flow-adjustable valve design method of a kind of many spray orifices and telescopic flow-adjustable valve, the conscious modification dimensionless of described design method valve flow coefficient
And aperture
Characteristic curve to recessed, forms desirable flow-adjustable valve with this characteristic curve, and its characteristic is to make flow with aperture
Linear change, at this moment the hydraulic pressure during throttle down was directly proportional with the shut-in time, and in the identical linear shut-in time, the surge pressure that flow-adjustable valve causes raises minimum.It is bigger that hole on the sleeve of the telescopic flow-adjustable valve of specific design is designed to the hole of upper cartridge, and the hole of lower cartridge is less.
The object of the present invention is achieved like this: the design method of the telescopic flow-adjustable valve of a kind of many spray orifices, and the step of described method is as follows:
The step of calculated water head loss: be used for according to specified criteria: the flow-adjustable valve design discharge
Q r, upstream and downstream pond water surface design altitude difference Δ
Z, the piping design resistance coefficient
SPass through formula:
Δ
H r=Δ
Z-
S?Q r 2
Loss of head Δ when calculating the flow-adjustable valve standard-sized sheet
H r
Calculate the step of the drum type inner brake sectional area of flow-adjustable valve: the drum type inner brake nominal diameter that is used to select flow-adjustable valve
D, and by drum type inner brake nominal diameter
DCalculate drum type inner brake sectional area
A
Calculate the step of resistance coefficient: be used for by the flow-adjustable valve design discharge
Q r, the loss of head Δ during the flow-adjustable valve standard-sized sheet
H r, drum type inner brake sectional area
AAnd formula:
Valve resistance coefficient when calculating the flow-adjustable valve standard-sized sheet
ζ r
Calculate the dimensionless flow coefficient of modulating valve
τValve opening coefficient with modulating valve
yBetween corresponding relation, and calculate to determine the step of the spray orifice parameter on the drum type inner brake: be used to set up dimensionless flow coefficient τ and valve opening coefficient
yCorresponding relation or approximate corresponding relation curve, and calculate the size of determining the spray orifice on the drum type inner brake and spray orifice distributed parameter along circumferential and axial according to described relation curve; The dimensionless flow coefficient τ of described calculating modulating valve and the valve opening coefficient of modulating valve
yBetween corresponding relation and calculate to determine that the step of the spray orifice parameter on the drum type inner brake can select one of following dual mode:
Mode one:
With Δ
Z, Δ
H r,
AAnd
yThe a plurality of numerical value that equal between the 0-1 are brought formula into:
By
Obtain a plurality of and the valve opening coefficient
yThe dimensionless flow coefficient that value is corresponding
τValue forms the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve;
According to the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve calculation determine spray orifice parameter on the drum type inner brake;
Mode two:
With the parameter Δ
Z, Δ
H r,
y=0.5 brings formula into:
Calculate
τ y=0.5 o'clock value
τ 0.5
With the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve be made as two sections:
According to
, promptly
, calculate different opening
yThe corresponding valve resistance coefficient
ζValue;
According to the valve resistance coefficient
ζWith the valve opening coefficient
yParameter, calculate to determine the size of spray orifice on the valve body and along the regularity of distribution of circumferential and axial.
A kind of telescopic flow-adjustable valve of many spray orifices according to the said method design, what the spray orifice parameter on wherein definite drum type inner brake adopted is mode two, comprise: the valve body that is provided with water outlet, the middle part of described valve body is equipped with valve seat, drum type inner brake with a plurality of spray orifices is installed on the described valve seat, the top of inner brake connects valve cage, described valve cage connects water intake, transmission and power plant also are installed on the described valve cage, the injection diameter of described drum type inner brake is different with the variation of position, the injection diameter of the drum type inner brake first half is bigger, and the injection diameter of Lower Half is less.
The beneficial effect that the present invention produces is: by with dimensionless valve flow coefficient
And aperture
Characteristic curve to recessed, forms desirable flow-adjustable valve with this characteristic curve.Can simply realize that by the nominal diameter of adjusting flow-adjustable valve drum type inner brake, the distribution and the size of the spray orifice on the drum type inner brake flow-adjustable valve of manufacturing carry out to(for) the existing technology of application does not increase too many difficulty during the specific design flow-adjustable valve.The diameter of spray orifice can achieve the goal about only changing on the drum type inner brake in actual production.The flow-adjustable valve that designs according to the method for the invention adapts to the Water Hammer Control of growing distance, large flow pipe road water-carriage system, and effect is obvious.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the water delivery engineering schematic representation;
Fig. 2 is the dimensionless valve flow coefficient of traditional flow-adjustable valve
And aperture
Characteristic curve;
Fig. 3 is the dimensionless valve flow coefficient of the desirable flow-adjustable valve of the embodiment of the invention one described method design
And aperture
Characteristic curve;
Fig. 4 is the dimensionless valve flow coefficient of the flow-adjustable valve of the embodiment of the invention three described method designs
And aperture
Characteristic curve;
Fig. 5 is the embodiment of the invention four described flow-adjustable valve structural representations.
Embodiment
Embodiment one:
The water level of water delivery engineering and the position of flow-adjustable valve are as shown in Figure 1.Wherein
Z 1With
Z 2Be respectively the level of tail water of the upper pool elevation and the flow-adjustable valve of flow-adjustable valve 1.Flow-adjustable valve is imported and exported loss of head and be can be described as
In the formula: Δ
HThe loss of head of-flow-adjustable valve;
V-flow rate of water flow by flow-adjustable valve,
ζ-valve resistance coefficient,
g-gravity accleration.
Formula (1) can be rewritten as
In the formula: Δ
H r-flow-adjustable valve standard-sized sheet, promptly
yThe loss of head of=1.0 o'clock flow-adjustable valve, wherein subscript r represents the flow-adjustable valve standard-sized sheet;
Dimensionless valve flow coefficient.
Flow-adjustable valve producer usually provides
ζ-
yDiscrete data is represented the flow-adjustable valve characteristic, or employing formula (2) relation can get dimensionless valve flow coefficient shown in Figure 2
τWith the valve opening coefficient
yRelation curve.
From Fig. 2 as seen, traditional dimensionless valve flow coefficient
τWith the valve opening coefficient
yCharacteristic curve is linear, perhaps epirelief, and this helps allowing accurate flow control in the whole stroke of valve, but is unfavorable for the Water Hammer Control of long pipeline.
Present embodiment is the design method of the telescopic flow-adjustable valve of a kind of many spray orifices.Present embodiment passes through the dimensionless flow coefficient
τWith the valve opening coefficient
yCombine with pepeline characteristic, obtain desirable modulating valve
τWith
yFormula, then according to the actual conditions needs, design adapts to many spray orifices cover skeleton symbol flow-adjustable valves of Water Hammer Control.
In order to realize above-mentioned target, at first set up analytical model:
The loss of head of valve can be described as
In the formula: Δ
HThe loss of head of-flow-adjustable valve,
Q-flow-adjustable valve flow,
A-flow-adjustable valve sectional area,
ζ-valve resistance coefficient,
g-gravity accleration.
Formula (3) can be rewritten as
In the formula: Δ
H r-flow-adjustable valve standard-sized sheet, promptly
y=1.0 o'clock, i.e. the loss of head of the flow-adjustable valve during valve wide open, wherein subscript r represents the flow-adjustable valve standard-sized sheet;
The dimensionless flow coefficient.
As shown in Figure 1, Bernoulli's energy equation of pond, pipeline upstream and lower reservoir is
In the formula:
Z 1Pond ,-upstream water level elevation;
Z 2Pond ,-downstream water level elevation;
S-pipeline resistance coefficient.The loss of head of the 3rd expression in formula (5) the right pipeline.
Formula (4) substitution formula (5) is got
In the formula:
Because during valve wide open
With
, can get from formula (6)
If flow
With valve opening
During linear change, promptly
At this moment flow-adjustable valve will have best hydraulic performance, and the flow-adjustable valve that satisfies this condition just is called desirable flow-adjustable valve.
Formula (7) and formula (8) are concerned that substitution formula (6) can get
Put in order
Formula (9) is exactly desirable flow-adjustable valve
τWith
yRelation.In other words, as long as satisfy formula (9) condition, flow is just with the valve opening linear change.Fig. 3 shows desirable flow-adjustable valve dimensionless flow coefficient
τWith valve opening
yRelation curve.Obviously, desirable flow-adjustable valve characteristic curve is a concave shape.
By
Can get
Formula (10) is exactly the valve resistance coefficient of desirable flow-adjustable valve
ζWith
yRelation.
According to this theory, present embodiment is as follows to the step of the design method of the design proposition of modulating valve:
The step of calculated water head loss: be used for according to specified criteria: the flow-adjustable valve design discharge
Q r, upstream and downstream pond water surface design altitude difference Δ
Z, the piping design resistance coefficient
SPass through formula:
Δ
H r=Δ
Z-
S?Q r 2
Loss of head Δ when calculating the flow-adjustable valve standard-sized sheet
H r
Calculate the step of the drum type inner brake sectional area of flow-adjustable valve: the drum type inner brake nominal diameter that is used to select flow-adjustable valve
D, and by drum type inner brake nominal diameter
DCalculate drum type inner brake sectional area
A
Calculate the step of resistance coefficient: be used for by the flow-adjustable valve design discharge
Q r, the loss of head Δ during the flow-adjustable valve standard-sized sheet
H r, drum type inner brake sectional area
AAnd formula:
Valve resistance coefficient when calculating the flow-adjustable valve standard-sized sheet
ζ r
Calculate the dimensionless flow coefficient of modulating valve
τValve opening coefficient with modulating valve
yBetween corresponding relation and calculate to determine the step of the spray orifice parameter on the drum type inner brake: be used to set up the dimensionless flow coefficient
τWith the valve opening coefficient
yCorresponding relation or approximate corresponding relation curve, and calculate the size of determining the spray orifice on the drum type inner brake and spray orifice distributed parameter along circumferential and axial according to described relation curve.
Dimensionless flow coefficient according to modulating valve
τValve opening coefficient with modulating valve
yBetween corresponding relation calculate to determine the mode of the spray orifice parameter on the drum type inner brake, can promptly determine according to desirable method by formula (10):
Will
yA series of values between 0 and 1 are brought a series of that formula (10) falls into a trap and get it right and answer into
ζValue.How much that selectes numerical value between 0 and 1 determines that by permissible accuracy the required precision height is then selected more numerical value, otherwise then few.For example: with 1/10th serves as to choose numerical value at interval then to be: 0.1,0.2 ..., or one of more accurate use percentage is at interval, perhaps coarse use 1/5th at interval or the like.Pass through formula then:
The value that calculates τ finally obtains
yWith
τBetween relation curve.Obtain to calculate the spray orifice size determined on the drum type inner brake according to this relation curve again and along the regularity of distribution of circumferential and axial.According to
yWith
τBetween relation curve calculate the spray orifice size on the drum type inner brake and be a kind of common computational methods along the distribution of circumferential and axial, can in many documents, find (Burgi, P. H. " Hydraulic Tests and Development of Multijet Sleeve Valves.”?Bur.?Reclam.?Rep.?RECERC77-14.?Div?of?Gen?Res.?December?1977.）。
Make that desirable flow-adjustable valve is technical can be accomplished, but may make the flow-adjustable valve nominal diameter
Excessive, the flow-adjustable valve cost is too high.In this case, adopt following design method: between 0 and 1, choose 1 to 3
yValue, calculate corresponding by formula (9)
τValue, several according to this
τValue is made one and is similar to ideal
yWith
τBetween the broken line type of relation curve
yWith
τRelation curve is again by this broken line type
yWith
τRelation curve calculate to be determined the size of spray orifice on the valve body and along the regularity of distribution of circumferential and axial.(special-purpose software is arranged).How much determining of selected element by precision, if select a point, as
y=0.5 broken line that obtains two sections if select two points, is exactly a tri linear, and so on.
Embodiment two:
Present embodiment is embodiment one improvement, is embodiment one the dimensionless flow coefficient about the calculating modulating valve
τValve opening coefficient with modulating valve
yBetween corresponding relation and calculate to determine the refinement of the step of the spray orifice parameter on the drum type inner brake.The dimensionless flow coefficient of the described calculating modulating valve of present embodiment
τValve opening coefficient with modulating valve
yBetween corresponding relation and calculate to determine the step of the spray orifice parameter on the drum type inner brake:
With Δ
Z, Δ
H r,
AAnd
yThe a plurality of numerical value that equal between the 0-1 are brought formula into:
By
Obtain a plurality of and the valve opening coefficient
yThe dimensionless flow coefficient that value is corresponding
τValue forms the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve;
According to the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve calculation determine spray orifice parameter on the drum type inner brake.
Present embodiment is a kind of design of desirable flow-adjustable valve.
Embodiment three:
Present embodiment is embodiment one improvement, is embodiment one the dimensionless flow coefficient about the calculating modulating valve
τValve opening coefficient with modulating valve
yBetween corresponding relation and calculate to determine the refinement of the step of the spray orifice parameter on the drum type inner brake.The dimensionless flow coefficient of the described calculating modulating valve of present embodiment
τValve opening coefficient with modulating valve
yBetween corresponding relation and calculate to determine the step of the spray orifice parameter on the drum type inner brake:
With the parameter Δ
Z, Δ
H r,
y=0.5 brings formula into:
Calculate
τ y=0.5 o'clock value τ
0.5
With the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve be made as two sections, as shown in Figure 4:
According to
, promptly
, calculate different opening
yThe corresponding valve resistance coefficient
ζValue;
According to the parameter of valve resistance coefficient ζ and valve opening coefficient y, calculate to determine the size of spray orifice on the valve body and along the regularity of distribution of circumferential and axial.Generally speaking, exist
The interval, spray orifice is big or small identical on the valve body;
The interval, the size of spray orifice is also identical on the valve body.
Present embodiment is a kind of dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the design of two broken lines, adapt to industrial production, existing flow-adjustable valve production technology need not change substantially, only on drum type size that inner brake punches change some are just passable.
Embodiment four:
A kind of telescopic flow-adjustable valve of many spray orifices according to the described method design of the foregoing description, as scheme shown in Figure 5, comprise: the valve body 6 that is provided with water outlet, the middle part of valve body is equipped with valve seat 7, drum type inner brake 8 with a plurality of spray orifices is installed on the valve seat, the top of inner brake connects valve cage 4, valve cage connects water intake 2, transmission and power plant 3 also are installed on the valve cage, the injection diameter of drum type inner brake is difference with the variation of its position on the drum type inner brake, the injection diameter of the drum type inner brake first half is bigger, and the injection diameter of Lower Half is less.
What present embodiment adopted is a kind of dimensionless flow coefficient of two broken lines
τValve opening coefficient with modulating valve
yBetween the flow-adjustable valve of design design of relation curve, the injection diameter of the so-called drum type inner brake first half is bigger, the injection diameter of Lower Half is less to refer at the first half of drum type inner brake differently with the diameter of the spray orifice of Lower Half, and the spray orifice of the first half is bigger, and the spray orifice of Lower Half is less.Initial stage water at the flow-adjustable valve opening process can only spray from less spray orifice like this, and at this moment because the spray orifice of opening is less, and the pressure of single spray orifice water is bigger, though the diameter of spray orifice is less, flow is not little.When the later stage of drum type inner brake opening process, the draining of most spray orifice, the hydraulic pressure of single spray orifice reduces, and at this moment uses the big spray orifice can enlargement discharge.According to desirable state, the drum type inner brake is to open from lower to upper, and the injection diameter that is distributed on the drum type inner brake should strengthen from lower to upper gradually.Otherwise if the drum type inner brake is to open from top to bottom, the injection diameter that is distributed on the drum type inner brake should strengthen from top to bottom gradually.In a word, the spray orifice of opening should be less earlier, and the spray orifice that open the back should be bigger.But in the manufacture process of actual flow-adjustable valve, the spray orifice of too many diameter is processed too complicated, and is unfavorable to the manufacturing process engineering.The injection diameter that only changes the drum type inner brake first half and Lower Half has been enough to the effect that reaches good, the diameter of spray orifice on the change drum type inner brake that therefore needn't be too much.
It should be noted that at last, below only unrestricted in order to technological scheme of the present invention to be described, although the present invention is had been described in detail with reference to the preferred arrangement scheme, those of ordinary skill in the art should be appreciated that can to technological scheme of the present invention (such as the conversion of formula,
τWith
yBetween other recessed modes of relation curve carry out etc.) make amendment or be equal to replacement, and do not break away from the spirit and scope of technical solution of the present invention.
Claims (2)
1. the design method of the telescopic flow-adjustable valve of spray orifice more than a kind is characterized in that the step of described method is as follows:
The step of calculated water head loss: be used for according to specified criteria: the flow-adjustable valve design discharge
Q r, upstream and downstream pond water surface design altitude difference Δ
Z, the piping design resistance coefficient
SPass through formula:
Δ
H r=Δ
Z-
S?Q r 2
Loss of head Δ when calculating the flow-adjustable valve standard-sized sheet
H r
Calculate the step of the drum type inner brake sectional area of flow-adjustable valve: the drum type inner brake nominal diameter that is used to select flow-adjustable valve
D, and by drum type inner brake nominal diameter
DCalculate drum type inner brake sectional area
A
Calculate the step of resistance coefficient: be used for by the flow-adjustable valve design discharge
Q r, the loss of head Δ during the flow-adjustable valve standard-sized sheet
H r, drum type inner brake sectional area
AAnd formula:
Valve resistance coefficient when calculating the flow-adjustable valve standard-sized sheet
ζ r
Calculate the dimensionless flow coefficient of modulating valve
τValve opening coefficient with modulating valve
yBetween corresponding relation, and calculate to determine the step of the spray orifice parameter on the drum type inner brake: be used to set up dimensionless flow coefficient τ and valve opening coefficient
yCorresponding relation or approximate corresponding relation curve, and calculate the size of determining the spray orifice on the drum type inner brake and spray orifice distributed parameter along circumferential and axial according to described relation curve; The dimensionless flow coefficient τ of described calculating modulating valve and the valve opening coefficient of modulating valve
yBetween corresponding relation and calculate to determine that the step of the spray orifice parameter on the drum type inner brake can select one of following dual mode:
Mode one:
With Δ
Z, Δ
H r,
AAnd
yThe a plurality of numerical value that equal between the 0-1 are brought formula into:
By
Obtain a plurality of and the valve opening coefficient
yThe dimensionless flow coefficient that value is corresponding
τValue forms the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve;
According to the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve calculation determine spray orifice parameter on the drum type inner brake;
Mode two:
With the parameter Δ
Z, Δ
H r,
y=0.5 brings formula into:
Calculate
τ y=0.5 o'clock value
τ 0.5
With the dimensionless flow coefficient
τValve opening coefficient with modulating valve
yBetween the corresponding relation curve be made as two sections:
According to
, promptly
, calculate different opening
yThe corresponding valve resistance coefficient
ζValue;
According to the valve resistance coefficient
ζWith the valve opening coefficient
yParameter, calculate to determine the size of spray orifice on the valve body and along the regularity of distribution of circumferential and axial.
2. telescopic flow-adjustable valve of many spray orifices according to the design of the described method of claim 1, what the spray orifice parameter on wherein definite drum type inner brake adopted is mode two, comprise: the valve body that is provided with water outlet, the middle part of described valve body is equipped with valve seat, drum type inner brake with a plurality of spray orifices is installed on the described valve seat, the top of inner brake connects valve cage, described valve cage connects water intake, transmission and power plant also are installed on the described valve cage, it is characterized in that, the injection diameter of described drum type inner brake is different with the variation of position, and the injection diameter of the drum type inner brake first half is bigger, and the injection diameter of Lower Half is less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102417865A CN101718347B (en) | 2009-12-11 | 2009-12-11 | Design method of multi-orifice sleeve-type flow control valve and sleeve-type flow control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102417865A CN101718347B (en) | 2009-12-11 | 2009-12-11 | Design method of multi-orifice sleeve-type flow control valve and sleeve-type flow control valve |
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| Publication Number | Publication Date |
|---|---|
| CN101718347A CN101718347A (en) | 2010-06-02 |
| CN101718347B true CN101718347B (en) | 2011-12-21 |
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|---|---|---|---|
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| CN110705109B (en) * | 2019-10-09 | 2023-04-04 | 重庆川仪调节阀有限公司 | Method for determining equal-percentage throttling window molded line of sleeve regulating valve |
| CN113408064B (en) * | 2020-03-17 | 2023-07-21 | 重庆川仪调节阀有限公司 | Method for determining equal-percentage throttling sleeve opening of sleeve regulating valve |
| CN114415748B (en) * | 2021-12-31 | 2024-04-26 | 浙江大学温州研究院 | Sleeve regulating valve resistance coefficient estimation method and system considering cavitation influence |
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