Vacuum Pumps Installing a Variable Acceleration 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 range of energy savings can be from 30 to 80 percent. They could be adapted to blower or in some instances rotary vane type vacuum pumps. They work by changing the speed of the vacuum pump based on the reading from a pressure sensor that's installed on the vacuum collection close to the receiver jar. The VSD is basically a dedicated computer with many adjustments therefore it could be possible to improve vacuum regulation over the normal pneumatic vacuum Energy-Conserving Vacuum Pump china 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 small dairies due to less milking period and thus shorter vacuum pump operate times but there are some other options to save lots of energy costs.