Solenoid valve coils have aGate Valves surprisingly high inductance and can generate interesting transients when de-energized. Proper twisting and shielding of the wiring to the solenoids can reduce the impact on otherCheck Valves adjacent circuits. 24V dc power circuits to instruments, etc isn't normally an issue. If this doesn't involvePlug Valves miles and miles of circuits, you could propose using metal-clad cable Ball Valves for the 24V dc Solenoid circuits. A free-wheeling diode will solve any DC coil issues. The magnetic field is neglible. No shielding no barriers needed. 4-10 mA is quite robust. If it were microphone (microvolt) signals, But Butterfly Valvesnot when it is 4-20 mA or +/-10 V. Not even encoder signals will be affected by the 24 V DC coil wires. Been there, done that - many many times.

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