Humphrey , for subbases and custom manifolds, provide almost frictionless movement and a long life. The valves have a flat armature with a low mass, for microsecond switching times. The valves come in two-way and three-way configurations in 7, 15, and 21-mm sizes and consume only 0.5 W.
Humphrey Products Co., Kilgore at Sprinkle, Box 2008, Kalamazoo, MI 49003, (269) 381-5500, humphreyproducts.com