Close-fitting back-seal structure of valve

The utility model provides a close-fitting back-seal structure of a valve. The close-fitting back-seal structure of the valve is composed of a gate plate, a circular shaft, a valve rod and a long T-shaped screw. The valve rod is T-shaped, and a circular penetrating hole channel in the horizontal direction is arranged at the bottom end. A +-shaped circular penetrating hole channel is arranged in the middle of the circular shaft, the hole wall in the vertical direction is provided with inner threads, and matched outer threads are arranged outside the inner threads and the vertical portion of the valve rod. An inverted T-shaped penetrating hole channel is arranged on the gate plate. The circular shaft is inserted into the circular penetrating hole channel arranged on the gate plate in the horizontal direction, the vertical portion of the valve rod is inserted into the circular penetrating hole channel of the circular shaft in the vertical direction, the long T-shaped screw penetrates the circular penetrating hol