Structure and problems of new metal hard seal butterfly valves


The disc of the metal hard seal butterfly valve is mounted in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc-shaped disc rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation is 90°, the valve is fully open.

At present, the metal hard seal butterfly valve has been widely used in many fields such as petroleum, chemical, metallurgy, and hydropower as a component for implementing the on-off and flow control of the pipeline system.

In the well-known butterfly valve technology, the sealing form is mostly sealed, and the sealing material is rubber, polytetrafluoroethylene or the like. Due to structural limitations, it is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance. A relatively advanced butterfly valve is a three-eccentric metal hard sealing butterfly valve. The valve body and the valve seat are connected members, and the sealing surface layer of the valve seat is welded with a temperature-resistant and corrosion-resistant alloy material. The multi-layer soft stack sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, the butterfly valve has high temperature resistance, light operation, no friction in opening and closing, and the seal is compensated with the increase of the torque of the transmission mechanism when closing, and the butterfly valve is improved. The sealing performance and the advantage of extending the service life.



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    Water-based Curing Agent is a polymer water-based emulsion, spray the surface of the newly poured cement concrete to form a protective film, plug the concrete pores, delay water evaporation, the concrete surface to form a continuous transparent film, sufficient Hydration to achieve conservation results.
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3, construction time is about 1-2 hours after calendering (depending on the ambient temperature and humidity at the time) The basic requirement is that the surface has no free water. If there is no spraying equipment, can also be used soft brush or roller construction, construction should be cautious operation, so as not to damage the concrete surface.

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