Vacuum Pumps The installation of a Variable Acceleration Drive (VSD), sometimes called a adjustable frequency drive, usually saves between 50 and 65% in electrical power costs with the same or better Energy-Conserving Vacuum Pump china regulation of vacuum. The range of energy savings could be from 30 to 80 percent. They could be adapted to blower or in some instances rotary vane type vacuum pumps. They work by changing the speed of the vacuum pump based on the reading from a pressure sensor that is installed on the vacuum series near the receiver jar. The VSD is basically a dedicated computer with many adjustments therefore it might be possible to improve vacuum regulation over the typical pneumatic vacuum regulator that just has a 
vacuum level adjustment. A VSD for a vacuum pump is usually economical for a dairy that milks a total of 8 hours or even more per day. Typically a VSD will not be an economical option for small dairies because of less milking period and therefore shorter vacuum pump run times but there are several other choices to save lots of energy costs.