Vacuum Pumps Installing a Variable Swiftness 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 number 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 speed of the vacuum pump predicated on the reading from a pressure sensor that is mounted on the vacuum line close to the receiver jar. The VSD is basically a dedicated pc with many adjustments so it might be possible to boost vacuum regulation over the normal pneumatic vacuum regulator that just has a vacuum level adjustment. A VSD for a vacuum pump is usually cost-effective for a dairy that milks a complete of 8 hours or even more per day. Energy-Conserving Vacuum Pump china 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 options to save energy costs.