First, the fixed ball valve casting method This is a traditional processing method, it requires a complete set of smelting, pouring and other equipment, but also need a larger factory and more workers, large investment, many processes, production process is complex, and Contamination of the environment, the technical level of workers in each process directly affects the quality of the product, the problem of leakage of the capillary pores can not be solved, while the rough machining allowance is large, waste is large, often found in the processing process due to casting defects make it scrapped, In order to increase the cost of the product, the quality cannot be guaranteed. This method should not be used by this factory.
Second, the fixed stainless steel ball valve forging method This is the current domestic many valve companies have adopted another method, it has two kinds of processing methods: The first is to use a round steel cut heat to forge into a spherical solid blank, and then machining. The second method is to form a stainless steel plate that has been blanked into a round shape on a large press machine to obtain a hollow hemispherical blank, and then machine the welded blank into a machined blank. This method has a higher material utilization rate, but requires a large power. Presses and heating furnaces and argon welding equipment are expected to require 3 million yuan for investment in productivity. This method is also not suitable for the factory.
Third, the fixed hard seal ball valve spinning method is a spinning method is an advanced method of cutting, no chip processing, is a new branch of pressure processing, it combines the forging, extrusion, rolling and rolling and other process features, with the use of materials High rate (up to 80-90%), saving a lot of processing time (1-5 minutes forming), after spinning the material strength can be doubled. Because of the small area of ​​contact between the rotating wheel and the workpiece during spinning, the metal material is in a biaxial or triaxial compressive stress state and is easily deformed. Under a small power, a high unit contact stress can be obtained (up to 25- 35Mpa). Therefore, the light weight of the equipment and the required total power (less than 1/5-1/4 of the press) are now recognized by the foreign valve industry as an energy-saving ball processing technology solution. In the processing of other hollow rotary parts.
Pressure reducing valve :
Y type filter :
Stainless steel ball valve :
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