Stainless steel valve is usually used in the working medium has a certain corrosive occasions. Any of a variety of valve materials, the resistance to working medium corrosion is relatively limited, and many factors. If used in the manufacturing process and heat treatment process properly, and thus ensure the corrosion resistance of this material. As for the concentration of> 98% concentrated nitric acid medium, no matter what kind of heat treatment process, the steel does not have corrosion resistance. Therefore, according to the nature of the working medium to choose the valve material, we must also study the media concentration, temperature and material heat treatment process and other factors on the corrosion resistance. Stainless steel valve has become the industry to buy the valve products, but the domestic can meet the international standards of valve manufacturers are few, so customers in the procurement of stainless steel valves must be required before the business to provide all kinds of stainless steel valve production and factory certification, so Can reduce the purchase of substandard products. Today, stainless steel valves and sanitary valves to achieve international standards of the valve mainly from Japan, Germany, the United States, Britain and the domestic first-line cities in Shanghai. Major manufacturers and brands are: Japan Kitazawa, Japan Valve Day, Britain UK, Germany TOP, the United States VTON and the domestic Wenzhou Kewell Valve Co., Ltd. Stainless steel valves are the control components of the pipeline fluid delivery system. They are used to change the cross section of the pipeline and the flow direction of the medium. The valve has the functions of diversion, cut-off, regulation, throttling, checkback, shunt or overflow pressure relief. For fluid control valves, from the simplest cut-off valve to a very sophisticated automatic control system used in a variety of valves, the variety and specifications of the valve nominal diameter from the very small instrument valve up to the diameter of 10m Industrial piping valves. The valve can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can vary from 0.0013MPa to 1000MPa, working temperature From -269 ℃ ultra-low temperature to 1430 ℃ high temperature. Valve control can be used a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, worm, electromagnetic, electromagnetic - hydraulic, electro - hydraulic, gas - hydraulic, spur gear, bevel gear drive ; Under pressure, temperature or other forms of sensing signal, according to the predetermined requirements of the action, or do not rely on the sensing signal for a simple open or close, the valve rely on the drive or automatic mechanism to make the hoist up and down, slip Move, swing or swing movement, thereby changing the size of its flow area in order to achieve its control functions.
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