The choice of the electric control valve flow characteristics

The characteristics of the flow control valve is flowing through the flow control valve medium valve opening. The manufacturer to provide the desired flow characteristics of the regulator valve, i.e. valve differential pressure constant in the entire range of the degree of opening of the flow characteristics, it is characterized by the characteristic of the regulating valve.
Production control valve, ideal flow characteristics is divided into the following four:
Linear flow characteristics, a linear relationship between the flow control valve opening degree;
standard air cylinder
Such as the percentage (logarithmic) flow characteristics, the change in flow rate regulating valve unit stroke caused by changes in flow proportional to this point;
Quick opening flow characteristics, this flow characteristics of a small opening in the traffic flow opening increases quickly reach the maximum;
Parabolic flow characteristics, adjust the flow rate is proportional to the square root of the relationship between flow changes caused by the changes in the valve unit travel this point.
Parabolic very close to the percentage of fast open only used for on / off control, so there are actually two control valve as the throttle adjusting only the percentage of straight-line features and characteristics.
Regulation for general conditioning system in a small load control valve amplification coefficient is small, so as not to overshoot and oscillation control valve amplification coefficient, and in a large load, so load fluctuations larger systems should choose the percentage of properties valve.

direct acting solenoid valves