Nuclear second-stage electric V-shaped brake valve

Abstract

The invention discloses a valve, in particular to a nuclear second-stage electric V-shaped brake valve comprising a valve rod and an electric device which can drive the valve rod to reciprocate on a straight line, wherein the bottom end of the lower part of the valve rod is fixedly connected with a flashboard subassembly which comprises a flashboard frame, a left flashboard, a right flashboard, a valve seat, a spring and a locating rack, the bottom end of the lower part of the valve rod is also fixedly connected with the flashboard frame, the left flashboard and the right flashboard are clamped in the flashboard frame and are also fixed in the flashboard frame by the locating rack, and a cavity which is provided with a horizontal compression spring is formed between the inner walls of the left flashboard and the right flashboard; the bottom of the flashboard frame is matched with a spacing lug boss of a valve body, and the side wall of the flashboard frame is provided with a groove which can be matched with a guide lug boss of the valve body; a left cavity and a right cavity are formed on the valve body by the flashboard subassembly; the locating rack, the flashboard frame and the valve rod are mutually fixedly connected; the valve seat is arranged between the outer wall of each flashboard and the valve body, and the other side of the valve seat is welded with the valve body. The nuclear second-stage electric V-shaped brake valve has good sealing property, reasonable structure and simple, easy and convenient installation.

Description

technical field [0001] The invention belongs to a valve, and in particular relates to a nuclear secondary electric V-shaped gate valve applied to the atmospheric exhaust system (GCT) of a mega-kilowatt nuclear power plant and installed outside the containment shell. Background technique [0002] The nuclear secondary electric V-type gate valve is one of the key valves of nuclear power plants. It has strict technical requirements and high safety factor. At present, China does not have the design and manufacturing capabilities. It is a product that developed countries block our technology and earn high profits at expensive prices. And after our analysis and research, the previous valves have the following shortcomings: [0003] (1) A positioning screw is installed on the head of the valve stem at an appropriate position, but after the valve has been working for a period of time, especially in such a harsh environment as a nuclear power plant, it is difficult to ensure that it ...

AI Technical Summary

Problems solved by technology

[0003] (1) A positioning screw is installed on the head of the valve stem at an appropriate position, but after the valve has been working for a period of time, especially in such a harsh environment as a nuclear power plant, it is difficult to ensure that it will not loosen and the entire The gate assembly moves downward, causing the valve to lose its sealing function

[0004] (2) The contact area between the gate and the positioning frame is too small, and the gate is easy to come out of the positioning frame

[0005] (3) The spring force is too large or too small, it is difficult to assemble if it is too large, and it is not easy to seal or even leak if it is too small

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