The HD steering gear is the product which absorbed the foreign advanced technology, and its working reliability is guaranteed from the designing, which makes operating the navigation effectively and accurately. The puise signal during maneuvering can be reacted immediately. Compared with the reciprocating type steering gear, the rotary vane steering gear possesses the following advantages, compactness, few moving parts, smooth rudder rotation, extensive rudder angle, convenience in installation shockproof and vibration proof properties, and less occupied area etc. So the HD steering gear is an ideal steering unit which can meet the meet the needs of different types of vessels. The HD steering gear has been produced for years, and it has been developing and promoting during the practice, especially its core technology the hydraulic sealing system is very mature and dependable. The product have achieved the authorization of the CCS, ABS, LR, BV etc. and also have passed the military check.