Patent ID: 9605765
Date: 2017-03-28
CPC Classifications: F16K,Y10T

Claim:
1. A rotary hydraulic valve comprising: a valve body in which an accommodation space is defined so as to accommodate a valve core having an axial post; the valve body including an inlet, a first working orifice, a second working orifice, a first returning orifice, and a second returning orifice which are all in communication with an external environment and the accommodation space; wherein the axial post of the valve core has a first oil return portion formed on a first end thereof and has a second oil return portion arranged on a second end thereof, the first oil return portion has a first trench defined thereon, and the second oil return portion has a second trench formed thereon; the axial post also has an oil inflow portion arranged on a middle section thereof, the oil inflow portion has a peripheral groove on which a first pressure balance orifice is formed; 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; the first work portion has two adjacent first troughs formed on a first peripheral side thereof and facing the oil inflow portion, and the first work portion has two adjacent second troughs formed on a second peripheral side thereof and facing the oil inflow portion, wherein the two first troughs and the two second troughs communicate with the peripheral groove of the oil inflow portion; the first work portion further has two opposite third troughs arranged between the first troughs and the two second troughs, such that the two third troughs face the first oil return portion and communicate with the first trench of the first oil return portion, and the first pressure balance orifice passes through the two third troughs so that the two third troughs communicate with each other through the first pressure balance orifice; the second work portion has two adjacent first grooves formed on a first peripheral side thereof and facing the oil inflow portion, and the second work portion and has two adjacent second groves formed on a second peripheral side thereof and facing the oil inflow portion, wherein the two first grooves and the two second grooves communicate with the peripheral groove of the oil inflow portion; the second work portion further has two opposite third grooves arranged between the first grooves and the two second grooves, such that the two third grooves face the second oil return portion and communicate with the second trench of the second oil return portion, and a second pressure balance orifice passes through the two third grooves so that the two third grooves communicate with each other via the second pressure balance orifice; wherein the valve core rotates to at least three angles relative to the valve body.