Vacuum Pumps Energy-Conserving Vacuum Pump china Installing a Variable Acceleration Drive (VSD), sometimes called a variable 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 may be adapted to blower or in some cases rotary vane type vacuum pumps. They function by changing the rate of the vacuum pump predicated on the reading from a pressure sensor that is installed on the vacuum series close to the receiver jar. The VSD is basically a dedicated pc with many adjustments so it could be possible to improve vacuum regulation over the typical pneumatic vacuum regulator that only includes 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 more each day. Typically a VSD will never 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.