Hydraulic Motor Spool Valve Motor Characteristic features: BM1 Series Motor is a small volume, spool valve, economical type of moto. Characteristic features: Compact design of spool and gear set, which provide small volume, high power and low weight. Credible design for shaft seal, which can bear high pressure and be used in parallel or in series. Special distribution flow system can meet the requirement of low noise. Direction of shaft rotation and speed can be controlled easily and smoothly. Best combination of efficiency and economy in medium load applications.