Vacuum Pump Type: Oil-lubricated pump (quieter and smooth) or Dry-type vacuum pump.Vacuum Pump Flow Capacity: 160 to 250 Liters per minute.Operating Vacuum Level: Adjustable between 40 kPa to 50 kPa (approx. 0.04 to 0.05 MPa).Pulsation Frequency: 60 to 80 cycles per minute (Standard configured rate is usually 64 beats/min to perfectly mimic a nursing calf).Pulsation Ratio: 60:40 (60% milking phase, 40% rest/massage phase to protect teat tissue