... air pressure ventilation shaft clutch: NAC5, NAC10, NAC40, NAC602. Air pressure ventilation shaft brakes: NAB5T/S, NAB10T/S, NAB20T/S, NAB40T, NAB65T3. Air compressor/pneumatic type ... magnetic powder clutch/brake7. Electromagnetic clutch/brake8.influencing hydraulic system of hydraulic pressure machinery widely applied in all kinds of mechanical manufacturing ...