metal sealing butterfly valve
product description
Manual flange hmetal seal flange butterfly valve adopts precision J-shaped elastic sealing ring and triple eccentric multi-layer metal hard seal structure. It is widely used in metallurgy, electric power, petroleum, chemical industry, water supply and drainage and municipal construction where the medium temperature is ≤425℃. On industrial pipelines, it is used to regulate flow and carry and break fluids.
Performance features
1. This valve adopts a three-eccentric sealing structure, with almost no wear on the valve seat and butterfly plate, and has a tighter sealing function as it is closed.
2. The sealing ring is made of stainless steel, which has the dual advantages of metal hard sealing and elastic sealing. It has excellent sealing performance no matter under low or high temperature conditions, and has the characteristics of corrosion resistance and long service life.
3. The sealing surface of the butterfly plate is made of cobalt-based hard alloy surfacing. The sealing surface is corrosion-resistant and has a long service life.
4. This valve has a two-way sealing function. It is not restricted by the flow direction of the medium or affected by the spatial position during installation. It can be installed in any direction.
product details
High quality material selection
Good materials and good workmanship Tough and does not break Not easy to age
Thickening and aggravation
Calibrate by thickness High strength, pressure resistance and high temperature resistance long lasting
Reliable sealing
Closer and tighter Flexible metal double seal Large flow area and small resistance
Quick opening and closing
Turbine transmission mode Save time and effort, switch quickly Transmission is flexible and efficient
Structural features and uses
Metal seal butterfly valve series products are long-life, energy-saving butterfly valves. The products comply with the national standards JB/T8527-97 (metal seal butterfly valve), GB/T13927-92 (universal valve pressure test) standards and other related standards for valves. This product consists of valve body, butterfly plate, sealing ring, transmission mechanism and other main components. Its structure is designed using the three-dimensional eccentric principle, and a new processing technology compatible with elastic sealing and hard and soft multi-layer sealing enables the butterfly valve to reduce its torque force during operation, achieving labor-saving and energy-saving functions. This ensures the overall reliability of the butterfly valve in terms of corrosion resistance, high temperature resistance and wear resistance. This butterfly valve is suitable for use in food, medicine, petrochemical industry, power plants, steel plants, industrial environmental protection water treatment and high-rise buildings, as the best device to regulate flow and cut off fluids in water supply and drainage pipelines.
Three-eccentric butterfly valve
If the valve stem axis deviates from the disc center and the body center at the same time, and the valve seat rotation axis has a certain angle with the valve body channel axis, it is called a triple-eccentric butterfly valve.
The first eccentricity: the valve shaft is located behind the valve plate shaft, allowing the seal to tightly surround and contact the entire valve seat.
The second eccentricity: the centerline of the valve shaft deviates from the centerline of the pipe and valve, which avoids interference from the opening and closing of the valve.
The third eccentricity: the valve seat cone axis deviates from the valve shaft centerline, which can eliminate friction during the closing and opening processes and achieve a uniform compression sealing effect around the entire valve seat.
Traditional butterfly valves all use positional sealing, but the emergence of triple eccentric butterfly valves has changed the sealing structure of traditional butterfly valves, and positional sealing has become torsion sealing.
A simple explanation is that the triple eccentric butterfly valve no longer relies on the elastic deformation of the valve seat to achieve sealing, but relies on the contact surface pressure between the butterfly plate sealing surface and the valve seat to achieve sealing.
In this way, the three-eccentric structure of the one-eccentric butterfly valve not only solves the problem of large leakage of the metal seat, but also has strong high-pressure and high-temperature resistance because the contact surface pressure is proportional to the medium pressure. The unique performance of the triple eccentric butterfly valve makes it widely used in oil pipeline cutting, metallurgical steel plants, and gas main pipeline regulation. Sectioning and cutting off, medium adjustment and cut-off of chemical refining equipment, water inlet and outlet adjustment and cut-off of water treatment equipment, cooling water system of thermal power station. Natural gas, alkali liquid, sea water, acid liquid and other industries.
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