HUMPHREY 501 AIR PILOT VALVES
Humphrey 501 Air Pilot Valves are a rugged, versatile, 1/2 NPT piston poppet design that is available in 3 way and 4 way configurations. The 3 way valve can be plumbed either normally open or normally closed. A latching pilot type in both 3 way and 4 way is available which uses output pressure to maintain the pilot signal.