Energy-Conserving Vacuum Pump vacuum Pumps The installation of a Variable Speed Drive (VSD), sometimes called a adjustable frequency drive, usually saves between 50 and 65% in electricity costs with the same or better regulation of vacuum. The range of energy savings can be from 30 to 80 percent. They can be adapted to blower or in some instances rotary vane type vacuum pumps. They function by changing the speed of the vacuum pump predicated on the reading from a pressure sensor that is installed on the vacuum range close to the receiver jar. The VSD is basically a dedicated pc with many adjustments therefore it could be possible to boost 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 total of 8 hours or even more each day. Typically a VSD will not be a cost-effective option for little dairies due to less milking time and therefore shorter vacuum pump run times but there are several other choices to save energy costs.