What are the two common types of rotary pumps?

What are the two common types of rotary pumps?

• A. Piston and diaphragm
• B. Gears and lobes
• C. Vane and impeller
• D. Screw and vane

Answer: (B)

Rotary pumps move fluid by rotating elements that trap fixed-volume pockets of liquid and carry them from suction to discharge, delivering a steady, positive-displacement flow. The two most common types of rotary positive-displacement pumps are gear pumps and lobed (or lobe) pumps. Gear pumps use intermeshing gears to trap fluid in the spaces between gear teeth and the housing, delivering it as the gears rotate. Lobed pumps use two or more lobed rotors that rotate in opposite directions, trapping and transporting fluid in pockets between the lobes and the housing for smooth, consistent flow, even with viscous liquids. Other options mix different pump principles (reciprocating versus rotary or centrifugal elements), whereas gears and lobes are the primary rotary types routinely highlighted for their reliability and flow characteristics in water systems.

Rotary pumps move fluid by rotating elements that trap fixed-volume pockets of liquid and carry them from suction to discharge, delivering a steady, positive-displacement flow. The two most common types of rotary positive-displacement pumps are gear pumps and lobed (or lobe) pumps. Gear pumps use intermeshing gears to trap fluid in the spaces between gear teeth and the housing, delivering it as the gears rotate. Lobed pumps use two or more lobed rotors that rotate in opposite directions, trapping and transporting fluid in pockets between the lobes and the housing for smooth, consistent flow, even with viscous liquids. Other options mix different pump principles (reciprocating versus rotary or centrifugal elements), whereas gears and lobes are the primary rotary types routinely highlighted for their reliability and flow characteristics in water systems.