Summary of corrugated pipe pneumatic valves are commonly used materials

in the metal corrugated pipe pneumatic valve, metal bellows component in the pneumatic valve stem and valve body between the process fluid provides the axial movement of metal shell, form a dynamic seal. Bellows under pneumatic compression and stretching of the stem under medium pressure, temperature and corrosion at the same time, to ensure that the pneumatic valve for zero leakage in life cycle. With the common application of corrugated pipe in pneumatic valve industry, technical requirements of corrugated pipe is increasing constantly. Pneumatic valves with metal corrugated pipe resistance to high pressure, high temperature resistant, corrosion resistance and long life direction. Must be suitable for the production of corrugated pipe material has good plasticity and high elastic limit, tensile strength and fatigue strength, good welding performance, stability of elastic properties. Austenitic stainless steel for with these performance characteristics, widely used in the manufacture of bellows. Resistance to high pressure is the basic requirement of pneumatic valves and corrugated pipe, but with the increase of pneumatic valve pressure rating, corrugated pipe wall thickness and stiffness increased, to the pneumatic valve opens and corrugated pipe manufacturing is more difficult. Corrugated pipe production factory is generally not simply increase the wall thickness, but by adding layer method to improve the product resistance to pressure, at the same time reduces the axial stiffness of the bellows, decrease the pneumatic valve opening force. Nominal pressure Mea - - Mm, layer number of - Layer. The stress level of corrugated pipe has a certain generality, has formed a series of products. When the stress reaches the MPa ( B above, according to the pneumatic valve diameter and working temperature, choosing the appropriate material manufactured by the specialized manufacturer of corrugated pipe design. Nonmetallic material excellent corrosion resistance, fluorine plastic anticorrosive widely used pneumatic valves, four fluorine pneumatic valve bellows have some application field. But for nonmetallic material strength and heat resistance are low, generally use temperature not to exceed ~ C, application range is restricted. Represented by, L austenitic stainless steel can handle corrosive weaker condition, but in the fight against chlor-alkail industry such as wet chlorine corrosion and other harsh corrosive conditions, must adopt excellent corrosion resistance of the corrosion resistance of alloy materials.