Which type of pump is best suited for high volume and less pressure?

The best choice for high volume and less pressure applications is a dynamic pump, specifically within the category of centrifugal pumps, which typically operate based on the principles of fluid dynamics. Dynamic pumps are designed to impart velocity to the fluid, which is then converted into pressure as the fluid exits the pump. This makes them very effective in applications where large volumes of water need to be moved quickly and with lower pressure requirements.

Dynamic pumps, including centrifugal pumps, are widely used in irrigation systems due to their efficiency in moving water over long distances without the need for significant pressure. They can handle varying flow rates, which is particularly advantageous in irrigation where the water demand may change throughout the irrigation cycle.

In contrast, positive displacement pumps are designed to move a fixed amount of fluid with each cycle, creating higher pressures, which makes them more suitable for applications requiring precise flow control and high pressure rather than high volume. The choice of vacuum pump relates specifically to creating a vacuum and is not intended for general fluid transport. Centrifugal pumps fall under the dynamic pump category, but the term "dynamic pump" encompasses various designs that can handle high volumes efficiently. Thus, identifying dynamic pumps as the answer emphasizes their role in irrigation systems where high flow rates at lower pressures are needed.