HUMPHREY MANUAL MECHANCIAL VALVE TECHNICAL SECTION
Humphrey manual mechanical valves employ a diaphragm poppet design which allows the valves to operate in a variety of air quality situations. No lubrication is required and the valves can be mounted in many different orientations. A full description of Humphrey manual & mechanical valves and their uses is contained in this section, 125 series, 250 series and 501 series.