What is the first step in the three-stage cycle of a piston positive displacement pump?

The first step in the three-stage cycle of a piston positive displacement pump involves the piston moving forward, which creates a high-pressure environment in the cylinder. This movement expels any fluid or air present in the cylinder, preparing it for the next stage of the cycle.

In a piston pump, the operation begins with the piston being pushed forward, which not only forces out the existing air but also builds up pressure that is crucial for the pump's functioning. This initial action sets the stage for the subsequent draw of water, as the pump's cycling mechanism relies on creating pressure dynamics to effectively move fluids through its system.

Understanding this process is essential because it highlights the fundamental mechanics of how a positive displacement pump operates. The role of creating pressure through the forward motion of the piston is critical in ensuring that the pump can successfully draw in water during the later stages of its cycle.