Vacuum Pumps Installing 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 can be from 30 to 80 percent. They can be Energy-Conserving Vacuum Pump adapted to blower or in some instances rotary vane type vacuum pumps. They function by changing the acceleration of the vacuum pump based on the reading from a pressure sensor that’s mounted on the vacuum range close to the receiver jar. The VSD is actually a dedicated pc with many adjustments therefore it might be possible to improve vacuum regulation over the normal 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 per day. Typically a VSD will not be an economical option for little dairies because of less milking period and thus shorter vacuum pump run times but there are several other choices to save lots of energy costs.