Classification and Specifications of Flanged Butterfly Valves

by:Lianke Valve     2022-08-17
Flanged butterfly valve is also divided into flanged soft sealing butterfly valve and flanged hard sealing butterfly valve. Flanged soft sealing butterfly valve: suitable for metallurgical, chemical, electric power and municipal engineering and water plants and other pipelines where the medium is water, oil and air, to cut off the fluid or adjust the flow of the medium. The specific features are: 1. Design The structure is novel, the overall size is small, and the weight is light. 2. The butterfly plate adopts double eccentricity, which can be opened and closed quickly, and the operation is light and labor-saving. 3. There is no sliding friction between the butterfly plate and the sealing ring, the sealing surface is wear-resistant, the service life is long, the sealing is reliable, and it is easy to adjust. Flanged hard sealing butterfly valve has the following characteristics: 1. The disc sealing ring is a soft and hard laminated metal sheet, which has the dual advantages of metal hard sealing and elastic sealing. It has excellent performance at low temperature and high temperature. sealing performance. 2. The three-dimensional eccentric structure is adopted, the valve seat and the disc are almost frictionless, and the sealing function is tighter and tighter. 3. The sealing surface of the valve body is made of surfacing stainless steel and cobalt-based cemented carbide. The sealing surface is wear-resistant and has a long service life. 4. Unique structure, flexible operation, labor-saving, convenient, not affected by high or low ring pressure, and reliable sealing performance. Features: 1. The structure is short in length and light in weight; the parts are well-selected. 2. The valve disc is a double-plate truss flow type, with small flow resistance, which improves the flow efficiency of the medium and saves the electricity cost of the pump and the operation efficiency. The PN6 is a single-plate type. 3. The valve seat is made of stainless steel and fixed on the valve body with a special bonding agent; the valve disc sealing ring is directly embedded with rubber in a zigzag manner, without the use of retaining rings or bolts, so it has the characteristics of simple structure and good sealing performance. 4. The US patented design of the pull-out pin structure replaces the key connection structure between the shaft and the valve disc, except that the parts can be interchanged and the valve shaft and the valve disc can be tightly joined together without gaps and will not loosen. 5. The sealing ring can be replaced without removing the valve shaft and valve disc from the valve. 6. The bearing of the valve shaft adopts self-lubricating bearing, which has low friction resistance during operation and does not require oil injection. 7. The contact interface between the valve disc sealing ring and the valve seat on the valve body can reach about ±1°C without water leakage. Main specifications of flanged butterfly valve: Nominal diameter (mm) DN350-DN2600 Nominal pressure PN6 PN10 PN16 Maximum working pressure MPa 0.6 1 1.6 Seal test pressure MPa 0.66 1.1 1.76 Strength test pressure MPa 0.9 1.5 2.4 Applicable medium water, sewage medium temperature≤ 65℃ medium flow rate≤3M/S
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