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Humphrey 500, 501, 590  Electric Valves are of double diaphragm poppet design.  Because these “no stick” valves require no lubrication, they are ideal for use with instrument air and other media which prohibit lubrication.  The use of lubrication, however, will not prevent a 500 Series valve from functioning if the lubricant is varied or removed.
500 Series electric valves have no sliding seals subject to cuts or metal seals subject to scratches, so they are ideal for use with contaminated media and are unaffected by compressor varnish.
With full 0.500 inch orifices, 500 Series valves have high flow (200 scfm at 125 psig).
500 Series valves are 2 position, 2 way, or 3 way, single, or double solenoid valves.   They are designed for rugged duty and rapid cycling, and can be mounted in any position with body mounting holes.  All 500 Series electric valves are furnished with brass bodies.