Bidirectional sealing gate valve and using method thereof

Abstract

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.

Description

technical field [0001] The invention relates to a gate valve, in particular to a two-way sealed gate valve and a use method thereof. Background technique [0002] Gate valve is a control element connected with pipeline equipment. During the opening and closing operation of the valve, the customer hopes to realize the opening and closing of the valve as soon as possible, reduce the operating torque, and achieve two-way sealing characteristics at the same time. However, when the existing gate valve is used, the gate (gate) does not move up and down smoothly, and the sealing effect between the gate and the valve body is not satisfactory after the gate is closed, and the valve opening and closing torque is large; there is a risk of wedging when the gate passes through . For example, the Chinese Utility Model Patent Publication No. CN204533612U discloses a two-way sealing knife gate valve with self-sealing and elastic compensating valve seat, which includes a valve body, pressur...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the gate valve does not move up and down smoothly when the gate valve is opened and closed, the gate valve is opened and closed with a large torque, and the two-way sealing performance is not good. Therefore, a two-way sealed gate valve and its use method are provided

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