Dive into the 2025 NY Wastewater Exam – Flush Away the Competition with Confidence!

Question: 1 / 400

Which positive displacement pump consists of a reciprocating membrane that forces material out through a discharge check valve?

Diaphragm

The diaphragm pump is known for its design that incorporates a reciprocating membrane or diaphragm. This diaphragm moves back and forth to create a cavity that expands and contracts, effectively drawing fluid into the pump during the suction phase and then pushing it out through a discharge check valve during the discharge phase. This process ensures that material is displaced in a controlled manner, making diaphragm pumps particularly effective for handling sludges and other viscous materials in wastewater applications.

In contrast, air lift pumps utilize buoyancy and compressed air to lift fluids, centrifugal pumps rely on rotating impellers to create fluid flow, and submersible pumps are designed to operate underwater without the specific mechanism of a diaphragm. Each of these pump types has its unique operational principle, making the diaphragm pump the only one in the list that involves a reciprocating membrane.

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Air Lift

Centrifugal

Submersible

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