Ponndorf® hose pumps are self-priming rotary positive displacement pumps. They operate based on the "peristaltic" principle:

• The pump consists of three major parts: hose, housing, and rotor. The hose is placed in the tubing bed — between the rotor and the housing — where it is occluded (squeezed).
• The rollers move across the hose, pushing the fluid. The tubing behind the rollers recovers its shape, creates a vacuum, and draws fluid in behind it.
• A "pillow" of fluid is formed between the rollers. This is specific to the ID of the hose and the geometry of the rotor. Flow rate is determined by multiplying speed (RPM) by the size of the pillow. This pillow volume is consistent, even under a wide range of viscosity.

• Handles abrasive slurries and corrosive fluids with minimal wear. Ideal for TiO2 (titanium dioxide) or diatomaceous earth (filter aid).
• No seals in contact with the medium pumped.
• No valves to clog.
• Smooth inner surfaces that are easy to clean.
• Fluid contacts only the hose material.
• Self priming and suction lift of up to 26 feet.
• Very low shear for handling the most shear-sensitive of fluids, like latex or fire-fighting foam.
• Capable of running dry and pumping fluids with high quantities of entrained air such as black liquor soap.
• High volumetric efficiency allows operation in metering or dosing applications where high accuracy is required.
• Handles extremely viscous fluids.
• Hose materials are available that are suitable for food and pharmaceutical use.
• Dual hose models for low pulsation requirements.

This hose pump design incorporates a unique tube-bed that ensures that one roller is always occluding the hose. It is termed "dry running" because rollers do not operate in a lubricated bath to occlude the hose.

Dry running pumps are available in models capable of discharge pressure up to 60 PSIG. Unique dual hose versions provide a nearly pulse-free flow stream.

Drive options. Standard drives are fixed-speed integral gearmotors. Optional drive packages include mechanical variable speed drives, inverter duty, and DC motors. Optional motor enclosure types include chemical duty, washdown (sanitary), and hazardous area rated motors.