Vacuum Pumps Installing a Variable Rate 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 number 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 function by changing the swiftness of the vacuum pump based on the reading from a pressure sensor that’s installed on the vacuum series near the receiver jar. The VSD is Energy-Conserving Vacuum Pump basically a dedicated pc with many adjustments therefore it might be possible to boost vacuum regulation over the typical pneumatic vacuum regulator that just includes 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 each day. Typically a VSD will never be an economical option for little dairies because of less milking time and therefore shorter vacuum pump operate times but there are some other options to save energy costs.