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pit federn springs are a new type of elastic component that uses high-pressure nitrogen as the working medium. They feature compact size, high spring force, long stroke, smooth operation, precision manufacturing, long service life (one million cycles), a flat force-deflection curve, and no need for pre-loading. They perform tasks that conventional elastic components such as metal springs, rubber, and air cushions struggle to accomplish, simplifying mold design and manufacturing, facilitating mold installation and adjustment, extending mold service life, and ensuring stable product quality. They can also be configured as a nitrogen spring system to operate as part of the mold.