Vacuum Pumps The installation of a Variable Swiftness Drive (VSD), sometimes called a variable frequency drive, usually saves between 50 and 65% in electrical power costs with the same or better regulation of vacuum. The number of energy savings could be from 30 to 80 percent. They may be adapted to blower or in some instances rotary vane type vacuum pumps. They work by changing the acceleration of the vacuum pump predicated on the reading from a pressure sensor that’s mounted on the vacuum series near the receiver jar. The VSD is actually a dedicated computer with many adjustments Energy-Conserving Vacuum Pump therefore it could be possible to boost vacuum regulation over the normal pneumatic vacuum regulator that only 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 more per day. Typically a VSD will not be a cost-effective option for small dairies because of less milking time and thus shorter vacuum pump run times but there are some other choices to save energy costs.