Vacuum Pumps Installing a Variable Velocity Drive (VSD), sometimes called a variable frequency drive, usually saves between 50 and 65% in electricity costs with the same or better regulation of vacuum. The number of energy savings can be from 30 to 80 percent. They can be adapted to blower or in some cases rotary vane type vacuum pumps. They work by changing the acceleration of the vacuum pump based on the reading from a pressure sensor that’s mounted on the vacuum line close to the receiver jar. The VSD is actually a dedicated computer with many adjustments therefore it might be possible to improve vacuum regulation over the normal pneumatic vacuum Energy-Conserving Vacuum Pump china regulator that just includes a vacuum level adjustment. A VSD for vacuum pressure 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 a cost-effective option for small dairies because of less milking time and thus shorter vacuum pump operate times but there are several other choices to save energy costs.