Eccentric wafer butterfly check valve

The utility model discloses a bivalve butterfly check valve for pipeline connection. An eccentric butt-clamping butterfly check valve comprises a valve body, a valve shaft, a torsion spring A, a valve clack A, a torsion spring B and a valve clack B. The number of the torsion springs B is two, the valve shaft is installed at the position deviating from one side of the central axis of the valve body, the valve clack A and the valve clack B are correspondingly installed on the two sides of the valve shaft through valve shaft holes formed in the valve clack A and the valve clack B respectively, the torsion spring A is installed in the middle of the valve shaft, and the torsion spring B is installed in the middle of the valve shaft. The two torsion springs B are mounted at the upper end and the lower end of the valve shaft; the valve clack A is a small valve clack, and the valve clack B is a large valve clack. When trace fluid flows through the valve body, the valve clack A is opened, the valve clack B is closed,