Sanitary fittings are equipment used in places where hygiene is critical and are widely used in the pharmaceutical industry. Under normal circumstances, sanitary pipe fittings will show their superiority in high-pressure, high-strength, mechanical structural materials. They are steel pipes that are resistant to weak corrosive media such as air, steam, water, and chemically etched media such as acids, alkalis, and salts. The author has learned that there are three main processing methods for sanitary pipe fittings: dust forging, roller and stamping. The forging method is to stretch a part of the pipe, which has the advantage of reducing the outer diameter. The roller method is to put a core inside the stainless steel pipe fitting, and the outer part can be pressed by a roller to carry out the method of processing the round edge. If the stainless steel pipe is processed by stamping, the tapered core can be expanded on the punch to the desired size. In the process of using sanitary fittings, the deformation of the fittings occasionally occurs. Some experts have introduced that there are many reasons for the deformation of pipe fittings. For example, the quality involves raw materials, process equipment, molds, operating processes, etc. At present, the quality problems of injection molding water supply and drainage pipe fittings at home and abroad are relatively poor in stability. The inner wall of the flower has a silver thread pattern, the internal stress is cracked, the wall thickness is uneven, and the hole is out of round, which makes the pipe fitting difficult, the butt welding overlap area is small, and the water leakage is easy. It is reported that the materials used by many manufacturers are not formal, and generally refer to the amount of nickel. Although it can be distinguished by syrup, this is a misunderstanding. Because the small charge contains only seven nickel, many can not be distinguished. However, the price difference of raw materials is very large, and this is one of the fakes. In particular, 321 high nickel and 316 high nickel are more serious. For pharmaceutical safety, all sanitary fittings should be used and maintained in a correct and reasonable manner to extend service life. Relevant experts suggest that users need to pay attention to the maintenance of sanitary fittings from the following three aspects. First, sanitary ball valves, sanitary-grade globe valves, sanitary gate valves are only fully open or fully closed, and can not be used to adjust the flow to avoid erosion of the sealing surface and accelerate wear. The gate valve and the upper thread stop valve have an inverted sealing device, and the hand wheel is screwed to the upper position to tighten, thereby preventing the medium from leaking from the packing. Second, sanitary fittings that are stored for a long time should be inspected regularly. The machined surface that is often exposed to the outside must be kept clean, dirt removed, and stored neatly in a place where the room is airy and dry, and it is strictly prohibited to be stacked or stored in the open air. The operator should always keep the pipe dry and ventilated, the retainer is clean and tidy, and stored in an accurate manner. Third, when installing, the sanitary pipe fittings can be directly installed on the pipeline according to the connection method, and installed according to the position used. Under normal circumstances, it can be installed at any position of the pipeline, but it is easy to check the operation. Pay attention to the flow direction of the stainless steel elbow medium. Under normal circumstances, it should be upward from the longitudinal valve. The stainless steel head can only be installed horizontally. Pipe fittings should pay attention to the sealing when installing, to prevent leakage and affect the normal operation of the pipeline. Sanitary pipe fittings have a high strength, generally using a crystal associated with ceramic materials, a small radius and a high ion configuration. Measured by the material and compressive strength mold, the brittleness of the ceramic itself can be limited, and its limitations reflect the increase in different ranges. The development of ceramic technology in accordance with materials and technology has been improved to make the sanitary pipe fittings greatly improved in toughness. In recent years, the technical materials market has undergone important development, and different development directions will bring their respective economic and social benefits. The advantages of stainless steel sanitary fittings are leading to great changes in the corrosion resistance and sealing of sanitary valve products through advanced technology and high quality, and greatly extend the service life of the valves.
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