Double-drive movable double-wedge-surface gate plate step-by-step action type gate valve

Abstract

The invention discloses a double-drive movable double-wedge-surface gate plate step-by-step action type gate valve which comprises a valve body, a valve deck, an electric device, a valve rod and a movable gate plate. According to the double-drive movable double-wedge-surface gate plate step-by-step action type gate valve, the electric device is used for driving the valve rod to stretch and contract. A pivot gate plate and the movable gate plate are driven to seal or open holes in a front valve seat of the valve and a rear valve seat of the valve in a wedge-shaped manner, and therefore the purpose of opening and closing the gate valve is achieved. In order to reduce operation force borne by the valve rod, a hole is formed in the middle portion of a second movable gate plate, so that when the gate valve needs to be opened, the pressure difference is built between an inner cavity and an outer cavity through the hole so as to reduce friction force between the movable gate plate and a valve seat, and the movable gate plate can disengage from the valve seat before opening. Thus, operation force is reduced, and an operation mechanism is not likely to be damaged; and the strength of operation elements in the gate valve can be designed to be lower, and therefore the size of the appearance of the gate valve is reduced, or the service life of the gate valve is prolonged. Due to the connecting manner of the pilot valve and the movable gate valve, the pilot valve and the movable gate valve are convenient to demount, and meanwhile replacement after abrasion is also facilitated.

Description

technical field [0001] The invention belongs to the field of gate valves for high-temperature and high-pressure systems, in particular to a step-by-step action gate valve with double-drive movable double-wedge-surface gate valves. Background technique [0002] The main gate valve of the nuclear reactor and the primary circuit system is an important guarantee for the safe operation of the system. When the system is in normal operation, the gate valve provides an overflow channel for the operation of the primary circuit system of the reactor. When the system is isolated, the gate valve can realize the function of closing and isolating, which wins valuable time for system repair and maintenance. [0003] At present, the domestic primary circuit main pipeline system adopts the electric gate valve, which uses the motor and the reduction mechanism to drive the screw to rotate and output torque to lift or push down the fixed gate to realize the opening and closing function of the g...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a step-by-step action gate valve with dual-drive movable double wedge surface gate valve, so that the movable gate can be separated from the valve seat before opening, and the movable gate can close the valve seat after reaching a predetermined position. The fully enclosed electric device is used as the driving device to completely solve the problems of electric gate valves such as severe gate abrasion, short service life, large gate friction, and easy fracture of the valve stem.

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