Auto drain valve
How an Auto Drain Valve Works And How to Set the Timings Right If you've got compressed air anywhere in your plant — receivers, filters, dryers, FRL units — you've got condensate forming inside them. Auto drain valves are the quiet little guys that get rid of that water before it becomes a bigger problem: rust in the lines, water hammer, contaminated instrument air, or a solenoid valve downstream that sticks because of gunk in the water. What's actually inside one Strip the cover off and it's simple: a solenoid valve (usually 2-way, normally closed) sitting on the drain port, driven by a small timer circuit board. The board has two adjustments ON time and Interval time plus sometimes a test button. ON time = how long the valve stays open to drain when it fires (usually 0.5 to 10 seconds). nterval time = how long it waits between drain cycles (usually 30 seconds to 45 minutes, depending on the model). The board runs on 220V AC or 24V DC depending on what you ordered, a...