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. Direction of shaft rotation and speed can be controlled easily and smoothly. Best combination of efficiency and economy in medium load applications. Oval flange, spigot diameter, shaft, port as per your requirement. Being applied in agriculture machinery, plastic machinery, cleaning machinery etc.