Sullair Corp. has expanded its line of V250S single-stage rotary screw air compressors. Featuring variable speed drive technology, the latest models are designed to combine Sullair’s basic single-stage rotary screw air end with today’s most innovative energy saving technology, according to the manufacturer. The compressors offer a choice of three Variable Speed Drive models ranging from 250 to 350 HP, with capacities of 1085 to 1580 cfm, and pressures of 100 to 125 psig. All three models are available with Sullair’s exclusive WS microprocessor control system.