We are offering overload protector. *overload protector can check the hydraulic pressure of cylinder inside the slider. *it can let the hydraulic pressure of cylinder released within 31000 seconds immediately. *when happening overload, it will release the electric signal and let the machine stop working. It can protect the press and die. *air driven hydraulic pump can supply the hydraulic pressure of cylinder quickly. *overload protector have pressure control valve, which can adjust hydraulic pressure caused by the oil temperature arising automatically.