Nuclear power steam cut-off control butterfly valve

Abstract

The invention discloses a nuclear power steam cut-off control butterfly valve in the technical field of valves. The nuclear power steam cut-off control butterfly valve comprises a valve body, a disc plate and a valve shaft. A circular valve cavity matched with the disc plate is formed in the valve body. The disc plate is installed on the valve shaft and arranged in the valve cavity in a matched manner. The two ends of the valve shaft extend out of the valve body. The extending-out end of the valve shaft is sleeved with a heat dissipation base. A shaft sealing device is arranged between the valve shaft and the valve body and comprises an outer sealing ring, a metal sealing ring and a sealing nut, wherein the metal sealing ring is arranged between the outer sealing ring and the sealing nut, and a good sealing effect can be achieved. Furthermore, the valve shaft is arranged in an offset manner, a sealing line on the disc plate is arranged in an offset manner, and the valve can be opened and closed more conveniently. The nuclear power steam cut-off control butterfly valve can serve as a valve for cutting off nuclear power steam and adjusting flow.

Description

technical field [0001] The invention relates to a valve, in particular to a valve used for nuclear power steam cutoff. Background technique [0002] In the Chinese patent database, a patented technical solution of a metal hard-sealed butterfly valve is disclosed. The application number of this patent is: 200810202212.2, the application date: 2008-11-04, the publication number: CN101392839A, the publication date: 2009-03-25, and Including the valve body, disc plate, sealing ring and valve shaft, the valve body is provided with a valve cavity matching the disc plate, the disc plate is installed on the valve shaft, and the disc plate is placed in the valve cavity, when the valve shaft rotates, the disc The plate can form a seal with the valve cavity or open the valve cavity. The sealing ring is made of stainless steel pipe. The sealing ring is embedded in the valve body or the disc plate. The formed sealing pair is a metal elastic sealing structure; it has good sealing performa...

AI Technical Summary

Problems solved by technology

[0003] Its shortcoming is that this kind of butterfly valve is only to solve the sealing problem of the disc plate in the valve cavity. Since the driving mechanism for the valve shaft to drive the valve shaft to rotate is arranged outside the valve body, the relationship between the valve body and the valve shaft must be in good condition. The sealing of the existing technology just fails to provide a technical solution to this technical problem

However, good sealing and easy opening are often contradictory. If you want to seal tightly, it is best to fully compress the two seals, and fully compressing will cause the problem of large opening torque. For this Technical problem, no better solution is given in the prior art

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