Horizontal valve driven by square shaft

The utility model discloses a horizontal valve adopting a square shaft for transmission, which comprises a horizontally arranged base and a roller support which is positioned on the base and is perpendicular to the plane of the base, a roller seat is connected onto the vertical plane of the roller support, and rollers are respectively arranged in the upper direction and the lower direction of the roller seat. A square shaft which is horizontally arranged is arranged between the rollers which are arranged up and down, the upper surface and the lower surface of the square shaft are planes, the upper surface of the square shaft is in contact with the lower end face of the roller above the roller seat, and the lower surface of the square shaft is in contact with the upper end face of the roller below the roller seat; the end portion of one end of the square shaft is connected to an air cylinder which is horizontally placed and drives the square shaft to horizontally move, the air cylinder is fixed to an air cylin