Vacuum Pumps The installation of a Variable Velocity 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 could be adapted to blower or in some instances 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 mounted on the vacuum series close to the receiver jar. The VSD is Energy-Conserving Vacuum Pump china basically a dedicated pc with many adjustments therefore it might be possible to boost vacuum regulation over the normal pneumatic vacuum regulator that just includes a vacuum level adjustment. A VSD for a vacuum pump is usually economical for a dairy that milks a complete of 8 hours or more per day. Typically a VSD will never be an economical option for little dairies due to less milking time and therefore shorter vacuum pump operate times but there are several other options to save lots of energy costs.