Vacuum Pumps The installation of a Variable Velocity Drive (VSD), sometimes called a adjustable frequency drive, usually saves between 50 and 65% in electricity costs with the same or better regulation of vacuum. The range of energy savings could be from 30 to 80 percent. They could be adapted to blower or in some cases rotary vane type vacuum pumps. They work by changing the quickness of the vacuum pump predicated on the reading from a pressure sensor that is installed on the vacuum series near the receiver jar. The VSD is actually a dedicated computer with many adjustments Energy-Conserving Vacuum Pump therefore it may be possible to boost vacuum regulation over the typical pneumatic vacuum regulator that only has a vacuum level adjustment. A VSD for vacuum pressure pump is usually economical for a dairy that milks a complete of 8 hours or more each day. Typically a VSD will never be a cost-effective option for little dairies due to less milking time and therefore shorter vacuum pump operate times but there are several other options to save energy costs.