Non-return valves, also known as check valves, allow fluid to flow in only one direction, preventing backflow that could damage equipment or disrupt processes. They automatically open with forward flow and close against reverse flow, making them ideal for pump protection and pressurized systems.

These valves are available in swing, ball, and lift types, and made from materials like brass, PVC, and stainless steel. Their simplicity, reliability, and low maintenance requirements make non-return valves indispensable in water supply systems, fire safety setups, and gas pipelines.