No minimum differential pressure to operate. Low and mean pressure versions. Injected or cast aluminium body. BSP or NPT threaded connections. Buna N seats. Class H coils with internal use housings. Includes terminals for the electrical connection. Connection for 1/2” NPT pipeline. 2088 Series For 220 V and 110 V : Current rectifier and transient reactive overvoltage supressor is supplied. Quick or two-stage slow opening. 1º Stage: Quick opening from 0 to 80% of the total adjustable stroke. 2º Stage: Adjustable slow opening up to 25 seconds from the end of stage 1, up to full stroke. Shutoff in less than one second.