BUTTERFLY TYPE CHECK VALVE

摘要

The present invention relates to a butterfly type check valve for opening or closing automatically an opening and shutting plate according to flow pressure by having a rotation shaft eccentrically upwards from the center of a valve main body. According to the present invention, the butterfly type check valve comprises: a rotation shaft (A2) eccentrically formed upwards from the center of the main body (A1); an opening and shutting plate (A3) mounted on the rotation shaft (A2) to open or shut a duct of the main body (A1); a stopper (A4) formed in front of the opening and shutting plate (A3) to maintain a closing state of the opening and shutting plate (A3); a weight (A5) formed in the end of one side of the rotation shaft (A2) for corresponding the opening and shutting pressure of the opening and shutting plate (A3); a buffer cylinder (A6) for preventing sudden rotation of the opening and shutting plate (A3); a manual operation lever (A9) for manually operating the opening and shutting plate (A3) by connecting a worm (A7) and a worm wheel (A8) in the end of the other side of the rotation shaft (A2); and a clutch lever (A10) for a user to select whether manually operating or not. The opening and shutting range of the opening and shutting plate (A3) can be restricted without the stopper (A4) inside the valve main body (A1) by removing the stopper (A4), having an eccentric shaft (10) in one side of the rotation shaft (A2) instead, and having an operating groove (21) corresponding to the orthogonal rotation radius of the eccentric shaft (10) inside an outer housing (20) of the eccentric shaft (10).