Self-priming Principle of Cam Rotary Pumps
Cam rotor pumps do possess a certain self-priming capability, but they differ fundamentally from traditional self-priming pumps. Their self-priming function originates from the sealed cavity formed when the rotor rotates, creating negative pressure through volume changes to draw in the medium. However, the self-priming height is typically limited to 5 meters, and the rotor requires lubrication to maintain a tight seal. Self-priming capability decreases significantly during dry operation.
Three Major Differences from Traditional Self-Priming Pumps
Working Principle: Self-priming pumps mostly utilize a gas-liquid mixing principle, while cam pumps rely on mechanical seals.
Starting Requirements: Traditional self-priming pumps can start dry, while cam pumps are recommended to be pre-primed.
Suction Lift Performance: Dedicated self-priming pumps can achieve a suction lift of up to 8 meters, while cam pumps typically have a suction lift of 3-5 meters
Application Scenarios Selection Guide: For applications requiring frequent start-stop cycles or media containing gas, dedicated self-priming pumps are recommended. Cam rotor pumps offer superior wear resistance when conveying high-viscosity or particulate media. Cam pumps are commonly used in the food and chemical industries to handle viscous materials, while high-suction-lift self-priming pumps are preferred for agricultural irrigation.
