IMPELLER TYPE WATER-HAMMER PROOF AND SILENT CHECK VALVE

摘要

An impeller type water-hammer proof and silent check valve includes a shell (2), a sealing ring (3), a fairing (4), a flow-guiding body (5) and a spring (7). Turbulent-flow blades (1) are provided on the outer surface of the flow-guiding body (5). Two groups of axial-flow blades are arranged in the flow passage, and the blades are fixed on the streamline outer surface of the flow-guiding body (5). The valve continuously converts pressure energy and kinetic energy to a torque surrounding an axial direction to the flow-guiding body (5) during a process of backflow liquid flowing through the turbulent-flow blades (1). The valve forms a pair of torques counteracting each other as the turbulent-flow directions of the two groups of blades are reverse. The liquid pressure energy and kinetic energy are continuously and gradually converted to the torque to the flow-guiding body (5) in the turbulent-flow blades (1), so that an abrupt impact to the valve by the water hammer is eliminated.