Author Archives: United Vacuum

A lot of smaller rotary vane vacuum pumps come equipped with an anti-suck back valve and this is built into the pump to stop migration of vacuum pump oil into the process chamber and vacuum lines.  But many larger rotary … Continue reading →

At United Vacuum, when we remanufacture a rotary piston vacuum pump (e.g., UniVac 400, Stokes 412), we bore the hinge bar area and fit the pump with oversized hinge bars and hinge bar spacer.  We replace the shaft.  On the … Continue reading →

What is the difference between remanufactured and rebuilt vacuum pumps?  Basically, remanufacturing returns the pump to OEM specifications, while rebuilding may not.  See the chart below to see the differences in processes performed in remanufacturing and rebuilding of rotary piston … Continue reading →

It is important to properly install and start up your vacuum pump, whether it’s new or re-manufactured. First, wire the pump and be sure to check rotation prior to connecting to the manifold/system. Only bump the pump; do not let … Continue reading →

When choosing a vacuum pump for Specialty Gas applications, it is important to consider many factors, including pump type, size and vacuum level required. There are 3 major types of pumps that may be used: Single stage oil sealed rotary … Continue reading →

The hinge bar bore area of a rotary piston vacuum pump is made up of 3 parts: the block, the piston slide and the hinge bars.  Each part is detailed below. The block of a rotary piston vacuum pump is … Continue reading →