Vacuum Pumps Installing a Variable Velocity Drive (VSD), sometimes called a adjustable frequency drive, usually saves between 50 and 65% in electrical power costs with the same or better regulation of vacuum. The number of energy Energy-Conserving Vacuum Pump china 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 acceleration of the vacuum pump predicated on the reading from a pressure sensor that is mounted on the vacuum collection close to the receiver jar. The VSD is basically a dedicated computer with many adjustments so it might be possible to boost vacuum regulation over the typical pneumatic vacuum regulator that just has a vacuum level adjustment. A VSD for a vacuum pump is usually cost-effective for a dairy that milks a total of 8 hours or more each day. Typically a VSD will not be an economical option for little dairies because of less milking time and therefore shorter vacuum pump run times but there are some other choices to save lots of energy costs.