The use and classification of manual butterfly valve

The butterfly plate of the manual wafer butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully open. The wafer butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. And it only needs to rotate 90° to open and close quickly, the operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. Butterfly valves have two types of seals: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the disc. Valves with metal seals generally have a longer life than those with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastomeric seals have the disadvantage of being limited by temperature. If the butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of the valve. The structure principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems in thermal power plants. Commonly used butterfly valves are wafer type butterfly valve and flange type butterfly valve. The wafer type butterfly valve uses studs to connect the valve between the two pipeline flanges. The flange type butterfly valve has a flange on the valve, and the flanges at both ends of the valve are connected to the pipeline flange with bolts. A, Performance comparison of manual wafer butterfly valve and gate valve Which of the ordinary butterfly valve and gate valve with the same nominal pressure and nominal diameter has better tightness and is not easy to leak? The tightness of the gate valve is better than that of the butterfly valve, but there are also manufacturers of butterfly valves with good tightness. The gate valve is bulky and takes up a lot of space. Butterfly valves are small in size and take up little space. The temperature of the medium, the sealing and packing of the valve should also be considered when the specific selection is made. The specification stipulates the use of butterfly valves with a nominal diameter greater than 50. The manual wafer butterfly valve is a national key new product. The high-performance manual butterfly valve adopts a double eccentric and a special inclined cone elliptical sealing structure. It solves the disadvantage that the sealing surface of the traditional eccentric butterfly valve is still in sliding contact friction at the moment of opening and closing 0°~10°. good purpose. B. Uses It is used for gas pipelines in the sulfuric acid industry: the inlet and outlet of the blower in front of the furnace, the inlet and outlet of the relay fan, the series and connection valves of the electric demister, the inlet and outlet of the S02 main blower, the adjustment of the converter, the inlet and outlet of the preheater, etc. to adjust and cut off the gas volume. It is used for sulfur incineration, conversion and dry suction in the sulfuric acid system. It is the preferred brand of valves for sulfuric acid plants. It is considered by the majority of users as: good sealing performance, light operation, secondary corrosion, high temperature resistance, convenient operation, Flexible, safe and reliable butterfly valves have been widely used. Also widely used in: SO2, steam, air, gas, ammonia, CO2 gas, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid in chemical, petrochemical, smelting, pharmaceutical, food and other industries It is used as a regulating and shut-off device on pipelines such as medium. C. Structural features ① The unique design of three-way eccentricity enables frictionless transmission between the sealing surfaces and prolongs the service life of the valve. ②Elastic seal is produced by torque. ③The ingenious wedge-shaped design enables the valve to have the automatic sealing function of closing and tightening, and the sealing surfaces have compensation and zero leakage. ④Small size, light weight, light operation and easy installation. ⑤Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control. ⑥The material of replacement parts can be applied to various media, and can be lined with anti-corrosion (lining with F46, GXPP, PO, etc.). ⑦Continuous structure diversification: wafer, flange, butt welding
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