The invention discloses a bidirectional sealing
gate valve and a using method thereof. The bidirectional sealing
gate valve comprises a valve
deck, a valve shaft, a valve body, a valve plate, a valveseat, a valve body sealing surface and a
valve seat sealing surface, wherein the
valve seat is connected to the valve plate through a
valve seat gland in a floating mode, an elastic connecting piece is arranged between the inner end face of the valve seat and the valve plate, a gear box cover is fixedly connected to the valve
deck, the gear box cover is fixedly connected with a valve shaft gland,the part, located below the gear box cover, of the valve shaft is connected with a center gear in a key mode, the outer edges of the two sides of the center gear are meshed with a left gear and a right gear respectively, the left gear and the right gear are connected with screw rods which penetrate through the valve
deck to extend downwards through flat keys respectively, and the
tail ends of thescrew rods are rotationally connected with the inner surface of the valve body. The bidirectional sealing
gate valve has the beneficial effects that 1, a hand wheel drives the gear, the gear drives the screw rods, the screw rods drive a gate plate, the matching precision is high, and due to the fact that the gate plate is supported at the two ends of the screw rods, the gate plate moves up and down stably; and 2, after the gate plate is closed, the valve seat realizes bidirectional sealing of the gate valve under the
double acting force of the
spring force and the thrust of a medium on the valve seat.