PU series solenoid valves have two types, PU220 direct acting type and PU225 pilot type. Direct acting type range from 1/8’’ to 1’’, the timer is available for 3/8’’ to 1’’, autodrain control, control frequency from 1 to 45 min, drain the water within 1 to 10 senconds. Pilot type range from 3/8’’ to 2’’, PU series valves are widely used in the air control system and water control system.