BYD fork hydraulic steering gear for the plunger type double oil cylinder structure, close the valve control system, equipped with two sets of oil pump units, one will be able to meet the provisions of the classification society for steering gear, two sets of mutually standby, due to the push the steering gear is a plunger type double cylinder structure, for a single rudder ship has obvious advantages, simple structure, light weight, small size, simple and reliable hydraulic system, the performance good, to use maintenance bring great convenience.