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Exclusive diaphragm-poppet design originated by Humphrey consists of two specially contoured diaphragms mounted on an axial stem within a full-ported, full-orifice valve body combined with Electropact (solenoid) lower-power operator.
This classic design requires no lubrication and is ideal for instrument air or other media which prohibits lubrication. The use of lubrication, however, will not prevent a 250 Series valve from functioning if the lubricant is varied or removed
Humphrey 250 Valves have no sliding seals subject to cuts or metal seals subject to scratches, so they are ideal for use with contaminating media and are unaffected by compressor varnish. 
They are designed for rugged duty and rapid cycling and can be mounted in any position.
The 250 Solenoid Valves have 1/4 NPT ports and orifice size and will flow Air, vacuum, or other gases.
Available with U.L. Rating, consult factory