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Three eccentric metal hard seal butterfly valve
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Product Details
Three eccentric metal hard seal butterfly valve
Product overview
The valve adopts three eccentric structure, the valve seat and disc sealing surface are made of different hardness and stainless steel, has good corrosion resistance, long service life, the valve and has two-way sealing function, the valve shaft at both ends to increase the elastic compensation structure, the valve at high temperature still has the same sealing performance with normal temperature, the product meets the national GB/T13927-92 valve pressure test standard. Widely used in metallurgy, electric power, petrochemical, as well as water supply and drainage and municipal construction and other industrial pipelines, for regulating flow and carrying off fluid use.
Features
1, the valve adopts three eccentric sealing structure, valve seat and butterfly plate almost no wear, with the more closed the more tight sealing function.
2. The sealing surface of the valve body adopts surfacing hard alloy, which is wear-resistant and has long service life.
3, large size butterfly plate using truss structure, high strength, large flow area, small flow resistance.
4. The driving device can be installed in multiple stations (rotating 90 ° or 180 °), which is convenient for users to use.
Technical parameters
Standard adopted
The key part of the relative movement of the shaft and the body adopts high wear-resistant self-lubricating composite bearings to reduce the butterfly.
The friction force of the plate when it is opened or closed ensures that the shaft and the body are never worn.
At the bottom of the lower shaft of the valve body, high hardness and wear-resistant alloy spherical thrust pads and high hardness flat pads are used. During the movement of the butterfly plate, all the downward gravity and friction forces are concentrated here. Due to the high hardness of the two thrust pads, the contact area is small and there is no wear for long-term movement, which ensures that the valve opens and closes easily and never sinks.
The three eccentric structure is designed to deviate the stem from the center line of the sealing surface to form the first eccentricity; the stem slightly deviates from the center line of the pipeline to form the second eccentricity; the valve plate sealing surface is processed into an oblique section of the cone to form the third eccentricity. The three eccentric structure uses the valve seal pair to reduce friction as little as possible during the opening and closing process, and the sealing surface is completely separated at the moment when the valve plate starts to rotate, so as to achieve a non-friction seal. This structure is a qualitative leap of the butterfly valve, so greatly improve the service life of the valve, and the size of the opening and closing torque has been significantly improved.
Metal-to-metal multi-level composite hard seal structure is a structural form in which multi-level composite metal is installed on the valve plate. Multi-level composite metal ring is made of stainless steel metal plate and flexible graphite sheet, which has high strength and rigidity. Flexible graphite still has good sealing performance under high temperature and high pressure. The characteristics of these two materials, making the valve suitable for the vast majority of media, the use of a wide range of long service life.
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