Blackmer is the leading global provider of innovative, high-quality sliding-vane
pump and reciprocating compressor technologies for the transfer of liquids and
gases. Since 1903, the Blackmer brand has stood for unparalleled product
performance, superior service and support, well-timed innovation and a
commitment to total customer satisfaction. Their pumps and compressors are used
in a multitude of applications in the process, energy, transport, and military
and marine markets.
Sliding Vane
These pumps have a number of vanes that are free to slide into or out of slots
in the pump rotor. When the pump driver turns the rotor, centrifugal force,
rods, and/or pressurized fluid causes the vanes to move outward in their slots
and bear against the inner bore of the pump casing forming pumping chambers. As
the rotor revolves, fluid flows into the area between the vanes (pumping
chambers) when they pass the suction port. This fluid is transported around the
pump casing until the discharge port is reached. At this point the fluid is
squeezed out into the discharge piping.
Centrifugal Pumps
The simplest type of centrifugal pump is the single stage machine that consists
fundamentally of a rotating element, called an impeller, and a casing. Liquid
is led to the eye or center of the impeller and is set into rotation by the
impeller vanes. By virtue of centrifugal force the liquid is thrown from the
rim or periphery of the impeller with a considerable velocity and pressure. The
casing, which closely surrounds the impeller, has a volute shaped passage of
increasing area, which collects the liquid leaving the impeller, and converts a
portion of its velocity energy into additional pressure energy. This casing
passage leads to the discharge nozzle of the pump where it is forced into the
discharge piping.
