Which pump is best suited to handle small quantities of liquids?

Which pump is best suited to handle small quantities of liquids?

• A. Reciprocating pump
• B. Centrifugal pump
• C. Rotary pump
• D. Diaphragm pump

Answer: (A)

When you need to move a tiny, exact amount of liquid, you want a pump that delivers a known volume with each action. A reciprocating pump uses a piston or plunger to displace a definite amount every time it completes a stroke. By adjusting how far the piston moves and how fast you drive it, you can meter very precise quantities, even at low flow rates, and you can generate the necessary pressure for injecting into a system. That fixed-volume per stroke behavior makes it ideal for small quantities. Centrifugal pumps rely on fluid momentum and head, so their flow is not fixed and changes with back pressure; they’re not reliable for precise dosing of tiny amounts. Rotary pumps provide a smooth, continuous flow but don’t offer the fixed-volume-per-cycle control that makes precise small-volume metering easier. Diaphragm pumps are also positive-displacement and can meter, but they’re often chosen for handling viscous or particulate-containing liquids or for chemical compatibility, rather than simple precise dosing of very small quantities.

When you need to move a tiny, exact amount of liquid, you want a pump that delivers a known volume with each action. A reciprocating pump uses a piston or plunger to displace a definite amount every time it completes a stroke. By adjusting how far the piston moves and how fast you drive it, you can meter very precise quantities, even at low flow rates, and you can generate the necessary pressure for injecting into a system. That fixed-volume per stroke behavior makes it ideal for small quantities.

Centrifugal pumps rely on fluid momentum and head, so their flow is not fixed and changes with back pressure; they’re not reliable for precise dosing of tiny amounts. Rotary pumps provide a smooth, continuous flow but don’t offer the fixed-volume-per-cycle control that makes precise small-volume metering easier. Diaphragm pumps are also positive-displacement and can meter, but they’re often chosen for handling viscous or particulate-containing liquids or for chemical compatibility, rather than simple precise dosing of very small quantities.