Which pump type is known to be relatively inexpensive and best when low to moderate pressures are needed?

The roller pump is recognized for its affordability and effectiveness in applications requiring low to moderate pressures. It operates using rollers that compress a flexible tube, which creates a suction and moves the fluid through the system. This design allows for smooth and consistent flow, making it suitable for various agricultural and horticultural applications where high pressure isn’t necessary.

Roller pumps are particularly advantageous in situations where the cost of equipment is a significant factor, as they are typically less expensive compared to other pump types. Their simplicity and ease of maintenance further contribute to their popularity in settings where budget constraints exist.

Other pump types, such as piston, diaphragm, and gear pumps, tend to be designed for specific applications that may require higher pressures or involve more complex mechanisms, thus making them more expensive to purchase and maintain.