Non-return valve for Demag AC 615

The non-return valve, part number 41415440, serves as a hydraulic safety component within the lift cylinder assembly of the Demag AC 615 crane. Its primary function is to permit hydraulic fluid flow in a single direction while blocking return flow in the opposite direction. By preventing the retraction of the lift cylinder, this valve holds the boom and its load in a fixed position, ensuring stability during operation even in the event of a pressure loss in the hydraulic circuit.

This component is engineered specifically for the Demag AC 615 all-terrain crane. It is installed directly on or in close proximity to the lift cylinder to manage the specific flow and pressure requirements of this machine. The design ensures compatibility with the existing hydraulic connections and operational parameters of the crane's lifting system.

Non-return valves in heavy machinery typically utilize an internal closing element, such as a ball or poppet, held against a seat by a spring. This mechanism remains closed until the pressure of the hydraulic fluid in the allowed direction overcomes the spring force, enabling flow. These valves are critical for maintaining load control and preventing uncontrolled movement of hydraulic actuators.