Which types of pumps are classified as reciprocating positive displacement pumps?

Reciprocating positive displacement pumps are characterized by their mechanism that moves fluid through the use of a back-and-forth motion, which creates pressure in the fluid. The pumps mentioned in the correct answer—plunger, diaphragm, and piston—are all recognized types of reciprocating pumps.

Plunger pumps use a back-and-forth motion of a plunger to move fluid, allowing for high pressure and precise flow control. Diaphragm pumps function similarly but utilize a flexible diaphragm that moves up and down to create suction and discharge. Piston pumps, which operate on a similar principle, use a piston within a cylinder to achieve fluid movement.

These types of pumps are effective for handling a range of fluids, including those that may contain solid particles or have high viscosity, making them highly versatile in wastewater applications. Their design allows for consistent delivery of fluid, regardless of pressure changes in the discharge system, which is a key aspect of positive displacement pumping.