Vacuum Pumps Installing a Variable Speed 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 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 based on the reading from a pressure Energy-Conserving Vacuum Pump china sensor that is mounted on the vacuum range close to the receiver jar. The VSD is basically a dedicated computer with many adjustments so it could be possible to boost vacuum regulation over the typical pneumatic vacuum regulator that only 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 each day. Typically a VSD will never be a cost-effective option for little dairies because of less milking period and therefore shorter vacuum pump operate times but there are some other choices to save lots of energy costs.