Our non-return valves are equipped with a diaphragm to prevent the discharge of liquid and gaseous fluids. The special feature of the latter is a silent closing without water hammer. This anti-return device guarantees the waterproofing essential for optimal fluid management, even with granular or sandy water. Non-return valves serve as raw filters and thus secure your equipment. In addition, they do not have moving moving parts subject to wear and tear, which guarantees a long service life.