Vacuum Positive Displacement Pumps
Features to look for include a vacuum breaker that allows the pump to run-on past demand. This eliminates rapid start/stop cycles and reduces energy usage. A built-in cartridge filter with fines collection pan is suggested as is a discharge muffler to reduce noise level. Some manufacturers offer sound-deadening curtains to further reduce noise level.
PD Pumps can be used with line diameters of 1.5-4"” and provide an operating vacuum level of 12”-13" Hg.
These pumps can be supplied as stand-alone pumps or multiple pumps may be mounted on a large rack with soundproofing curtains. It is fairly common for conveying systems to include one or more back-up pumps to provide coverage during maintenance times or for expansion.