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Corrugated pipe common materials introduced
In metal bellows valves, a metal bellows assembly provides an axially movable metal housing between the valve stem and the process fluid in the valve body to form a dynamic seal. Bellows withstands compression and extension of the valve stem while under pressure, temperature and corrosion of the medium, ensuring zero leakage over the life of the valve. With the widespread application of bellows in the valve industry, the technical requirements for bellows are also continuously increasing. Valve with metal bellows continue to high pressure, high temperature, corrosion-resistant and long-life direction. Suitable for the production of corrugated pipe materials must have good plasticity, high elastic limit, tensile strength and fatigue strength, good weldability, stable elastic properties. Austenitic stainless steel is widely used to make bellows because of these performance characteristics. Pressure resistance is the pressure on the valve and the basic requirements of the bellows, but with the valve pressure level increases, the bellows wall thickness increases and increased stiffness to the valve opening and bellows have increased the difficulty of manufacturing. Bellows manufacturers generally do not simply increase the wall thickness, but by increasing the number of layers to improve product pressure resistance, while reducing the axial stiffness of the bellows and reduce the valve opening force. Nominal pressure 15Mea (9001b) below austenitic stainless steel bellows wall thickness is generally 0.1-0.3mm, the number of layers 1-6. The pressure level of corrugated pipe has a certain versatility, has formed a series of products. When the pressure reaches 25MPa (1 5001b) above, according to the valve diameter and temperature to choose the right material, designed and manufactured by the professional bellows manufacturers. Corrosion resistance of non-metallic materials, excellent performance, fluorine plastic anti-corrosion valve widely used, PTFE bellows valve also has some applications. However, due to non-metallic materials, low strength and heat resistance, the general use temperature does not exceed 150 ~ C, the scope of application is limited. Austenitic stainless steels represented by 304 and 316L can handle corrosive corrosive conditions. However, when dealing with wet chlorine corrosion in chlor-alkali industries and other harsh corrosive conditions, corrosion-resistant alloys with excellent corrosion resistance must be used material.