... the following features: 1, the clamp from the torque hydraulic motor driven back by clamp rack plunger drive, drive concise, ... with the upper and lower clamp Fuzheng outside agencies, rotating stable, long service life. 4, Lord, matching clamp back, reversing valve can ... clamping or string. 5, friction braking institutions in the clamp heads of the adjustment, maintenance more convenient. 6, and ...