Valve handles demanding jobs
A
Moog product story
Edited by the Engineeringtalk editorial team
Oct 17, 2007
The combination of permanent magnets and electromagnetic coils results in spool driving forces considerably larger than those that can be obtained by solenoid coils alone.
Moog has released the series of DDV proportional hydraulic valve.
At the heart of most modern hydraulic control systems is the proportional valve and at the heart of the best proportional valves is the bi-directional, permanent magnet linear force motor.
Thanks to the inclusion of a pair of high-energy rare earth magnets, the Direct Drive Valve (DDV) from Moog is able to offer significantly higher performance than other valves.
This has resulted in its use in a range of demanding applications.
The combination of permanent magnets and electromagnetic coils results in spool driving forces considerably larger than those that can be obtained by solenoid coils alone.
Lower power consumption provides another potential advantage, with a maximum consumption of 28.8W.
In operation, the electromagnetic coils act as 'switches' that divert the permanent magnetic flux paths, effectively acting as an amplifier, but without drawing additional current from the drive electronics.
The result is that the spool position control is 'stiff' and well able to counter the flow forces that are created on the spool when the valve is passing high flow rate at high pressure.
In contrast, conventional proportional valves face a conflict between 'stiffness' and drive current that cannot always be resolved where high flow and high-pressure performance is demanded.
Moog DDVs have rated flows from 1.9 litres a minute up to 15.1 litres a minute.
The dynamic performance of the valve is largely insensitive to system pressure, which can be up to 350bar.
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