Humphrey poppet-style, cartridge valves achieve fully ported, high flow performance relative to overall size. Technically, a mechanically operated plunger valve, these cartridge valves are also ready to recieve customer supplied operators, such as manual or air pilot operators, including solenoid pilot interfaces. Light weight, aluminum body. Construction is simple, reliable. The pressure unbalanced piston-poppet design achieves greater flow than comparable valves and millions of trouble-free cycles.