Vacuum Pumps The installation of a Variable Rate Drive (VSD), sometimes called a adjustable frequency drive, usually saves between 50 and 65% in Energy-Conserving Vacuum Pump china electricity costs with the same or better regulation of vacuum. The range of energy savings could be from 30 to 80 percent. They may be adapted to blower or in some cases rotary vane type vacuum pumps. They function by changing the quickness of the vacuum pump based on the reading from a pressure sensor that’s mounted on the vacuum series close to the receiver jar. The VSD is basically a dedicated computer with many adjustments so it may be possible to improve vacuum regulation over the typical pneumatic vacuum regulator that just has a vacuum level adjustment. A VSD for vacuum pressure pump is usually cost-effective for a dairy that milks a complete of 8 hours or even more per day. Typically a VSD will not be a cost-effective option for little dairies because of less milking time and thus shorter vacuum pump operate times but there are several other options to save lots of energy costs.