Proportional Valve Actuator

Power operated valve actuator in a liquid or gas network.

proportional valve actuator

Description

The Proportional Valve Actuator block models a power actuator used in conjunction with a valve block from the Fluids and Gases library. It can be used in conjunction with any valve block that accepts a scalar signal as input. The signal to open or close the valve is input to port A. The position of the connected valve is returned as a signal to port S.

The opening or closing value can be adjusted using the Actuator gain parameter. A first-order time delay is applied to the actuation distance:

where

- is the signal input to port A multiplied by the actuator gain Actuator gain. The value of is limited by the value of Valve stroke at the top, and the negative value of Valve stroke at the bottom;
- the current position of the actuator;
- time constant, the value of Time constant.

Ports

Input

# A — control signal
scalar

Details

A signal that controls the closing or opening of a valve. The signal is multiplied by the value of the actuator gain Actuator gain.

Data types	`Float64`.
Complex numbers support	No

Output

# S — valve position, m
scalar

Details

Opening distance for the connected valve in m.

Data types	`Float64`.
Complex numbers support	No

Parameters

# Actuator gain — drive gain
m | cm | ft | in | km | mi | mm | um | yd

Details

Input signal multiplier for valve opening distance.

Values	`m` \| `cm` \| `ft` \| `in` \| `km` \| `mi` \| `mm` \| `um` \| `yd`
Default value	`5e-4 m`
Program usage name	`gain`
Evaluatable	Yes

# Time constant — time constant of the opening signal
d | s | hr | ms | ns | us | min

Details

A constant that determines the time required to reach steady state conditions at actuation. This parameter affects the delay in response to the valve opening or closing signal.

Values	`d` \| `s` \| `hr` \| `ms` \| `ns` \| `us` \| `min`
Default value	`0.01 s`
Program usage name	`tau`
Evaluatable	Yes

# Valve stroke — valve stroke
m | cm | ft | in | km | mi | mm | um | yd

Details

Maximum opening distance of the connected valve.

Values	`m` \| `cm` \| `ft` \| `in` \| `km` \| `mi` \| `mm` \| `um` \| `yd`
Default value	`0.005 m`
Program usage name	`stroke`
Evaluatable	Yes