The Planted Tank Forum - View Single Post - Okay To Mount Needle Valve Before Solenoid?
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post #2 of (permalink) Old 12-09-2012, 02:48 AM
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Putting a solenoid before the needle valve has the benefit of not putting pressure on the needle valve itself constantly. Solenoid before needle valve means shutoff of gas before it hits the needle valve if it's off.
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