Adjust the pneumatic valve is what? < / div >

regulating pneumatic valve for regulating the flow of medium, pressure and liquid level.
according to adjust the position signal, the automatic control of pneumatic valve opening, so as to achieve the adjustment of the medium flow rate, pressure and liquid level.
adjust electrical regulating pneumatic valve, pneumatic valve pneumatic regulating pneumatic valve and hydraulic pneumatic valve, etc.
this manual mainly introduce:
electric regulating pneumatic valve and pneumatic pneumatic valve two kinds.
regulating pneumatic valve consists of electric actuators or pneumatic actuators and regulating pneumatic valve in two parts.
adjustment and usually can be divided into direct single seat type and direct two-seater type two kinds, the latter has a large flow capacity, unbalanced and the characteristics of stable operation, so often especially suitable for large flow, little pressure drop and leakage.
flow capacity Cv selection in regulating pneumatic valve is one of the main parameters, to adjust the flow capacity of pneumatic valve is defined as: when regulating pneumatic valves, pneumatic valve pressure difference on both ends of 0. 1 mpa, the fluid density is 1 g/cm3, regulating the flow of pneumatic valve number per hour flow diameter, called flow capacity, also known as the flow coefficient, expressed as a Cv, unit for t/h, Cv value of the liquid press type calculation.
according to the flow capacity Cv value look-up table size, you can determine to adjust nominal size of the pneumatic valve DN.
adjust the flow characteristic of pneumatic valve, pneumatic valve is in both ends of the pressure difference under the condition of constant, the medium flows through adjusting the relative flow pneumatic valve and the relationship between its opening.


adjusting flow rate characteristics of pneumatic valve has a linear features, such as percentage and parabolic characteristics of three. The meaning of three kinds of injection flow characteristic.
is as follows:
( 1) Such as percentage of features, Logarithmic)
percentage characteristics such as relative stroke and the relative flow is no linear relationship,
in the process of every point unit running changes caused by the flow of change is proportional to the flow of this point,
flow change percentage is equal. So it has the advantage of traffic hours, changing flow is small, large flow, the flow rate change is big, is also on the different opening, with the same
adjustment precision.
( 2) Linear features, Linear)
linear characteristic of relative stroke and the relative flow into a linear relationship.
unit trip caused by the change of the flow rate change is constant. Large flow, the flow relative changes little, flow,
hour flow relative change is big.
( 3) Parabolic feature

two proportional flow according to the schedule changes, generally with linear and percentage in the middle of the properties, etc.
can be seen from the analysis of the above three kinds of characteristic, its regulation performance,
is optimal with characteristics such as percentage, its regulation stability, good regulation performance. And parabolic characteristics than the linear characteristic of good regulation performance,
can be according to the requirement of the application of different, choose any of them a flow characteristic.
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