Profile: Tri-Rotor, Inc. specializes in manufacturing positive displacement rotary piston pumps and parts under the brand name of Tri-Rotor. We have the ability to replace or retro-fit oldest pumps from in-stock parts or with minor modifications. Our 20DV pumps' feature provides an automatic regulation of flow from maximum to zero, at minimum pressure, with a constant speed motor. The variable volume control changes the length of the stroke of the piston and shuttle to vary the volume of material displaced by the pump. These pumps applications include fuel & fuel oils, coolants, feed products, paints, vegetable oils, solvents, inks, filter and filter presses.