High-precision double-flow-phase balance valve

The utility model discloses a high-precision double-flow-phase balance valve which comprises a valve body, a valve seat is arranged in the valve body and comprises an upper valve seat body and a lowervalve seat body, an upper valve cavity and a lower valve cavity are formed in the two sides of the valve seat body respectively, a valve element is arranged at the position of the valve seat, and twogroove sets are formed in the valve element and comprise an upper groove set and a lower groove set respectively. The upper groove group is matched with the upper valve seat, the lower groove group is matched with the lower valve seat, and each groove group is provided with a plurality of sub-grooves; a signal cavity is formed in one side of the valve body and provided with an upper cavity pressure leading opening and a lower cavity pressure leading opening, a piston is arranged in the signal cavity, one end of a connecting rod is connected with the valve element, the other end of the connecting rod extends into the s