Models a power-controlled valve actuator in an isothermal liquid system
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The Proportional Valve Actuator block models a power-controlled actuator used in conjunction with a valve block in an isothermal network. The signal to open or close the valve is received at port A. The opening distance for a connected valve is returned as a physical signal at port S.
You can adjust the opening or closing magnitude with the Actuator gain parameter. A first-order lag in time is applied to the actuation distance:
IG is the signal received at port A multiplied by the Actuator gain. Outside of the valve stroke limits, IG is the Valve stroke if fully extended and the negative Valve stroke if fully retracted.
d is the current actuator position.
τ is the Time constant.
This reference page is for the Isothermal Liquid library block. For the Hydraulics (Isothermal) Liquid library block, see Proportional and Servo-Valve Actuator.
Use the Variables tab to set the priority and initial target values for the block variables prior to simulation. For more information, see Set Priority and Initial Target for Block Variables.
A— Valve opening signal
Physical signal that indicates valve opening or closing, specified as a physical signal. The signal is multiplied by the Actuator gain value.
S— Valve opening distance, in m
Opening distance for the connected valve, specified as a physical signal in m.
Actuator gain— Input signal multiplier
5e-4 m(default) | positive scalar
Input signal multiplier for the valve opening distance.
Time constant— Opening signal time constant
0.01 s(default) | positive scalar
Constant that captures the time required to reach steady-state conditions during actuation. This parameter impacts the response lag to the valve opening or closing signal.
Valve stroke— Maximum valve opening distance
0.005 m(default) | positive scalar
Maximum opening distance of the connected valve.