"THE UNIT IS A PNEUMATICALLY ACTUATED, SPRING LOADED CLOSED, BUTTERFLY TYPE PRESSURE REGULATOR AND SHUTOFF VALVE. THE UNIT IN CONJUCTION WITH A REMOTE MOUNTED BLEED AIR REGULATOR, CONTROLS THE MAIN ENGINE BLEED PRESSURE TO A PREDETERMINED LEVEL. TEMPERATURE RANGE -65 TO 525 DEG F; PRESSURE RANGE 2.45 TO 15.5 PSI"