Pneumatic Pressure/Exhaust/Off Valve

Solenoid valve manifolds typically consist of two "input" ports, pressure (P) and exhaust (E), and a number of "output" ports, each of which is initially linked to the E port.  When a per-valve solenoid is energized, the output port is disconnected from the E input and linked to the P input.  [This is the pneumatic equivalent of a set of break-before-make SPDT electrical relays with common throws.]  To cut down on power consumption and solenoid size, most solenoid manifolds are internally pilote...