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A proportional valve is one which can vary the output in response to the variation of electric input. The output of these valves depend on the magnetic force of the solenoid. There are three types of proportional valves, electrohydraulic proportional flow control, pressure control and directional valves.
The purpose of this manual is to explain how proportional valves work. To do this, the terminology associated with proportional valves, basic construction, operating parameters and how the valves are controlled, will be presented.