Gardner Denver”s Welch VARIFLOW DC-Drive Vacuum Pumps are designed for OEM and laboratory applications. The totally dry DC-drive variable-speed vacuum pumps can be used for full chemical-duty and standard-duty operation. Featuring a two-stage diaphragm mechanism with 45 LPM flowrate and ultimate vacuum to 1.5 torr (<2 mbar). The Chemical Duty Model 8115D-20 uses PTFE heads and diaphragms and FKM valves. The Standard Duty Model 8115D-25 uses aluminum heads, EPDM diaphragms, and valves. OEM designs are available with or without power supply and controller in an enclosure or as a bare pump. All models use 24V brushless DC motors with a maximum power consumption of 85 watts and can restart under vacuum.