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We can accept that for small valves with low shifting distances the direct acting solenoid concept will work, and it does. With reasonable quality compressed air, direct acting solenoids (and the small valves they actuate) can be relied on for millions of cycles with little or no problem. They are the right product for the right job. What is it that the small, direct acting solenoid valve controls? Compressed air, of course. And why do we use compressed air to do work? As compressed air is able to exert significant force, more than just a solenoid coil can. What do we need to shift the internal workings of larger air valves? Enough force from the valve actuator to ensure that the valve poppet or spool will actually shift and control the flow of the compressed air when it's asked to do so.
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