Through the hydraulic check valve principle, keep the hydro-cylinder not back, under the condition that mould hydro-cylinder without locking block. In another word, the hydro-cylinder can bear the impulse force during die casting, and not back (empirical data: 5T self-locking hydro-cylinder 120mm trip all outstretched, 15T external pressure can keep 30 seconds, back 0.1mm).

The specifications for self-locking hydro-cylinder, please follow mould hydro-cylinder, in fact, add self-locking device in the basis of ordinary mould hydro-cylinder, and improve the compression strength of hydro-cylinder. Illustrativecase: GY6 right cover.