Here we see some pallet valves I made out of solenoids.  I fabricated the stoppers with oak dowel and window foam punchings, and I fabricated the mounting plates for the solenoids.  This worked okay, but it was hard to balance the noise with the sealing effectiveness.

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Building the box

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Windchest and toe board

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A rank of solenoid valves

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Wiring the solenoids