Introduction: Compared with conventional butterfly valves, stainless steel butterfly valves have the advantages of high temperature resistance, light handling, and other advantages.
Americans invented the butterfly valve in the 1930s. After the 1970s, butterfly valves began to be promoted in China.
The butterfly valve is a kind of valve that rotates around the valve shaft to open and close. It mainly acts as a cutting and throttling in the pipeline, and has the characteristics of small operating torque, small installation space and light weight.
The stainless steel butterfly valve adopts a triple eccentric multi-level metal hard seal structure. The valve seat and the disc sealing surface are made of stainless steel with different hardness, and have good corrosion resistance and long service life.
Stainless steel butterfly valves are widely used in metallurgy, electric power, petrochemical, municipal construction and other industrial pipelines where the medium temperature is ≤ 425°C to regulate the flow and carry off the fluid.
Compared with the traditional butterfly valve, the stainless steel butterfly valve has the advantages of high temperature resistance, easy operation and so on.
In addition, the stainless steel butterfly valve opens and closes without friction. When closing, the torque is increased with the transmission mechanism to compensate the seal. This improves the sealing performance of the butterfly valve and prolongs the service life of the butterfly valve.
The boiler water wall is the main radiation heat surface, arranged inside the boiler chamber and proceeds the heat exchange directly with the high temperature flame. The convection tubes are the convection heat surface of the boiler, arranged between the boiler chamber outlet and the end heat surface and proceed the heat exchange directly with the high temperature fume. The water wall and convection tubes are the main heat surface of the boiler, the tubes diameter for both generally usedΦ 51-60mm boiler steel tubes, also as the request.
The first type is the bare pipe water wall. This is the simplest structure of the water wall. The advantage is that ordinary seamless steel pipes can be used, and it is more convenient to replace the water wall pipe. The disadvantage is that the temperature of the furnace wall is still high, and heavy refractory bricks are required. The steel frame of the corresponding boiler should be strengthened. , The air leakage of the furnace wall is relatively large. Old-fashioned high-pressure boilers and medium and small boilers are used more frequently.
The second tupe is the membrane water wall. The membrane water wall is welded by seamless steel tubes with fins. The Water Wall Tubes are connected by fins to make the water wall into a whole. This kind of water wall is called a membrane water wall. Its function is to strengthen the heat transfer of the water wall and greatly reduce the temperature of the furnace wall. The furnace wall does not need refractory bricks, but only requires thermal insulation materials. Compared with the conventional heavy furnace wall, the weight can be reduced by 60% ~ 70%, the furnace wall heat storage is reduced by 80%, the start and stop time is shortened, and the fuel consumption is reduced. The load of the furnace steel frame is greatly reduced, saving refractory materials and steel.
The third type is the pierced pipe water wall. The barbed pipe water wall pipe is made by welding many grab nails with a length of 20 to 26 mm and a diameter of 6 to 12 mm on the water wall pipe. It is mainly used to lay the gas belt. Generally, for boilers that burn fuel with low calorific value and low volatile content, in order to stabilize the fire, pierced pipe water walls are often used for laying the fire protection belt.
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