Abstract: A rotary hydraulic valve contains a valve body in which an accommodation space is defined to accommodate a valve core having an axial post. The valve body includes an inlet, a first working orifice, a second working orifice, a first returning orifice, and a second returning orifice. The axial post has a first oil return portion, a second oil return portion, and an oil inflow portion. The first oil return portion has a first trench, the second oil return portion has a second trench formed, and the oil inflow portion has a peripheral groove. Between the oil inflow portion and the first oil return portion is defined a first work portion, and between the oil inflow portion and the second oil return portion is defined a second work portion. Furthermore, the valve core rotates to at least three angles relative to the valve body.

Abstract: A hydraulic rotary valve comprises a valve body formed with a plurality of outer ports and a spool rotatably disposed in the valve body, and the spool is formed with a plurality of inner ports. The spool is capable of rotating at least three angles with respect to the spool to enable the respective outer ports of the valve body to be in or not in communication with the respective inner ports of the spool, thus making the hydraulic liquid flow in desired directions to control predetermined motions of an actuator. The hydraulic rotary valve is easy to manufacture, and has less leakage and less pressure loss problem.