Regarding the material issues of valves
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Due to the varying applications and usage scenarios, different types of valves have different requirements in terms of material, pressure tolerance, diameter, driving mechanism, and so on. Recently, the materials used for various valves have really confused me; I hope everyone can help me by discussing the specific materials used for these valves and the differences between them! Ball valves, butterfly valves, solenoid valves, air-controlled valves, gate valves, stop valves, throttle valves, diaphragm valves, check valves, and steam traps. The media are analyzed for water and gas.
I’ll provide an analysis of the ball valve; I hope everyone can offer their feedback! Since ball valves typically use rubber, nylon, and polytetrafluoroethylene as materials for the valve seat seals, their operating temperature is limited by the properties of these seal materials. The shut-off function of a ball valve is achieved by the metal ball pressing against the plastic seat under the influence of the medium (in the case of a floating ball valve). Under a certain contact pressure, the valve seat seal ring undergoes elastoplastic deformation in localized areas. This deformation can compensate for the manufacturing accuracy and surface roughness of the sphere, ensuring the sealing performance of the ball valve. Nominal pressure or pressure class: PN1.0–32.0 MPa, ANSI CLASS 150–900, JIS10–20K. Nominal diameter: DN6–900, NPS 1/4–36. Connection methods: flange, butt welding, threading, socket welding, etc. Operating temperature range: -196°C–540°C. Actuation methods: manual, worm gear drive, pneumatic, electric, hydraulic, pneumatic-hydraulic, electro-hydraulic. Valve body materials: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. By using different materials, it can be suitable for various media such as water, steam, oils, nitric acid, acetic acid, oxidizing media, and urea. Furthermore, since the seat seals of ball valves are usually made of plastic, when selecting the structure and performance of ball valves, their fire resistance and flame retardancy must be taken into account. This is especially important in industries such as petroleum, chemicals, and metallurgy, where ball valves are used in equipment and piping systems handling flammable and explosive substances. Ball valves are also suitable for pipeline systems with light structures, low-pressure shut-off (small pressure difference), and corrosive media. Ball valves can also be used in low-temperature (cryogenic) equipment and piping systems. In the oxygen pipeline systems of the metallurgical industry, ball valves that have undergone strict degreasing are required. When the main pipelines in oil and gas transmission lines need to be buried underground, full-bore welded ball valves must be used. When regulatory performance is required, ball valves with a special structure featuring V-shaped openings should be selected. In the petroleum, petrochemical, chemical, power, and urban construction industries, ball valves with metal-to-metal sealing can be used for pipeline systems where the operating temperature is above 200 degrees Celsius.
On your company’s website, there’s a long list of materials such as ceramics, high-temperature steel, titanium, and nickel. Don’t you know about WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), and Ti? What is the use of the material? ? ? WCB is not corrosion-resistant; the others are 316. 304 grades are all corrosion-resistant; it’s just that the different nickel contents result in varying performance in different media
This depends on your regular accumulation. Look at other people’s drawings more often. How others choose materials.