. 
Hose Pumps generally for Sludge and Slurry below 8 Bar 115 psi, in up to 150 mm Diam. pipe (6"), produce a back flow pulse on discharge, and a positive suction side pulse. Hose and Peristaltic Pump dampers provide forward flo from the pump while the shoe is lifting off the Hose and there is backflow to fill the void.
A peristaltic pump, or roller pump, is a type of positive displacement pump used for pumping a variety of fluids. The fluid is contained within a flexible tube fitted inside a circular pump casing (though linear peristaltic pumps have been made). A rotor with a number of "rollers", "shoes" or "wipers" attached to the external circumference compresses the flexible tube. As the rotor turns, the part of tube under compression closes (or "occludes") thus forcing the fluid to be pumped to move through the tube. Additionally, as the tube opens to its natural state after the passing of the cam ("restitution" or "resilience") fluid flow is induced to the pump. This process is called peristalsis.
Peristaltic pumps are typically used to pump clean/sterile or aggressive fluids, because cross contamination cannot occur. Some common applications include aggressive chemicals, high solids slurries and other materials where isolation of the product from the environment, and the environment from the product, are critical.
