What type of pump creates flow by trapping a certain amount of water and then forcing that water through a discharge outlet?

What type of pump creates flow by trapping a certain amount of water and then forcing that water through a discharge outlet?

• A. Positive displacement pump
• B. Centrifugal pump
• C. Diaphragm pump
• D. Submersible pump

Answer: (A)

Flow created by trapping a fixed volume of water and then forcing that volume through the discharge outlet is the hallmark of a positive displacement pump. In these pumps, a chamber or mechanism captures a specific amount of fluid on each cycle and then pushes that exact amount out, producing a metered flow that is largely independent of the system pressure until limits are reached. This contrasts with centrifugal pumps, which rely on an impeller to add energy to the fluid and move it based on head and pressure rather than a fixed per-cycle volume. A diaphragm pump is a subtype of positive displacement that achieves the same trapped-volume action with a flexible membrane, but the general principle is still the same. Submersible pumps describe where the pump operates rather than how it creates flow.

Flow created by trapping a fixed volume of water and then forcing that volume through the discharge outlet is the hallmark of a positive displacement pump. In these pumps, a chamber or mechanism captures a specific amount of fluid on each cycle and then pushes that exact amount out, producing a metered flow that is largely independent of the system pressure until limits are reached. This contrasts with centrifugal pumps, which rely on an impeller to add energy to the fluid and move it based on head and pressure rather than a fixed per-cycle volume. A diaphragm pump is a subtype of positive displacement that achieves the same trapped-volume action with a flexible membrane, but the general principle is still the same. Submersible pumps describe where the pump operates rather than how it creates flow.