The utility model relates to a single current valve especially involves a bush formula single current valve, mainly is applied to among each oil well process flow of oil field enterprise. It comprises valve body and a detachable case, and the valve body is the three -way pipe column structure, and wherein violently the pipe is equipped with the import, and the riser is equipped with the export, and the internal diameter of exit end is less than the internal diameter of valve body cavity, and upper and lower both ends are equipped with connecting thread in the valve body riser, the case is become by the single current valves of neck bush and upper end installation, and the neck bush is the H type, is equipped with reducing section on the outer pipe wall on its baffle upper portion, and reducing section opens at the middle part has radial drain hole. The utility model discloses aim at solving single current valve at present commonly used and overhaul some technological problem such as difficult, disk seat, the unable dismantlement of valve ball in the use, shorten the well time that stops, the potential safety hazard can be avoidd to rate when improving oil well production, avoids the pollution to the environment.