Vacuum Pumps The installation of a Variable Swiftness 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 number of energy savings could be from 30 to 80 percent. They could be adapted to blower or in some cases rotary vane type vacuum pumps. They work 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 actually a Energy-Conserving Vacuum Pump dedicated computer with many adjustments therefore it may be possible to boost vacuum regulation over the normal pneumatic vacuum regulator that just includes 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 more each day. Typically a VSD will never be a cost-effective option for small dairies because of less milking time and thus shorter vacuum pump operate times but there are some other choices to save energy costs.