Vacuum Pumps The installation of a Variable Quickness 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 Energy-Conserving Vacuum Pump china changing the rate of the vacuum pump based on the reading from a pressure sensor that is mounted on the vacuum collection near the receiver jar. The VSD is actually a dedicated computer with many adjustments therefore it may be possible to boost vacuum regulation over the typical pneumatic vacuum regulator that only has a vacuum level adjustment. A VSD for a vacuum pump is usually cost-effective for a dairy that milks a total of 8 hours or even more each day. Typically a VSD will not be an economical option for little dairies due to less milking time and therefore shorter vacuum pump operate times but there are some other options to save energy costs.