John Blue Company demonstrates how to properly winterize a John Blue NGP Piston Pump. This includes filling the tank with antifreeze after draining the tank of any prior fluid according to manufacturer specifications, and changing the pump setting to 10. Finally, pump RV-antifreeze through the flow divider until it can be seen inside the discharge lines.

Piston pumps, much like plunger pumps, use a plunger or piston to move media through a cylinder. Piston pumps are a type of positive displacement pump, meaning they use expanding and contracting cavities moving in a reciprocating motion to move fluid. This reciprocating motion builds pressure in a cylinder, which moves fluid through. Interior pressure controls the inlet and discharge valves on the cylinder.

There are two main types of piston pump: axial and radial. An axial piston pump contains a number of pistons attached to a block. The pistons move in the same direction as the block. A radial piston pump contains pistons arranged around a block, which is rotated by a drive shaft. The block pushes the pistons, causing compression and expansion and generating pressure.