The needle valve allows you to cushion the actuation however if you’re going to use it you’ll need to find the sweet spot and build “pierce delay” into your g-code to make up for the lag. When you apply 5vdc to the trigger leads the solenoid actuates(solenoid LED comes on) it turns the etcher on and pressurizes the down force port on the cylinder while the retract port vents through the needle valve. When you turn the power on the inside of the relay box turns green but it has nothing to do with the solenoid and the valve still shouldn’t move. The t-port feeds the down force port on the cylinder and the etcher. The needle valve line connects to the retract port on the cylinder. Do you possibly have your air lines reversed? When you pressurize the spool valve with the power off air should port to the needle valve. I read your response so I hauled it down to the shop to double check.
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