How a High Pressure Washer Pump Works？

How a High Pressure Washer Pump Works?
Crankcase
A typical pressure washer pump works by changing the rotating motion of a crankshaft into a back-and-forth motion of a piston or plunger device inside a cylinder. This type of pump is called a reciprocating positive displacement pump. The whole system works much like a car engine. Most High pressure washer pumps have either two cylinders (duplex) or three (triplex).

The two main elements of a pressure washer pump are the crankcase and the manifold. The crankcase connects to the power source. The crankshaft's cams rotate and move connecting rods forward and backward, a motion often termed "reciprocal." Attached to the connecting rods are plunger guides that run from the crankcase into the manifold cylinders.

Manifold
Water exiting a DIY pressure washer runs through the manifold. Plungers or pistons, which rest tightly inside the cylinders, connect to the plunger guides with retaining bolts. The manifold also contains inlet and discharge valves, which enable the pump to maintain a continuous flow of water. The water travels only one way through the valves---in through the inlet valve and out through the discharge valve.

Valves control flow
As the crankcase rotates, the plunger or piston is drawn up in what's called a backward stroke. At this point, an inlet valve opens and allows water to enter the manifold. This happens because, as the plunger or piston is brought up, the volume in the chamber increases, lowering the pressure inside the chamber and triggering the valve to open.

The inlet valve then closes, and the plunger or piston begins its downward thrust. This forces the discharge valve to open, releasing the water through the hose and nozzle.

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