Titanium for its good mechanical properties and excellent corrosion resistance, widely used in chemical industry, medicine and health care, salt, alkali, aviation and other fields. In the chemical industry is mainly used as pressure vessel, pipeline and pump valve. The fixed ball Industrial Valves, cast iron with good sealing, excellent corrosion resistance and adapt to the characteristics of high working pressure, widely used in petroleum, chemical industry. Developed DN80, (DN40, DN25, and using the pressure up to 9. 8 mpa stationary titanium ball valve, filled the domestic blank, which laid a foundation for batch production, corrosion resistant equipment for large-scale petrochemical enterprises localization transformation provides the technology and material guarantee. The design and calculation process of stationary titanium ball valve is described in this paper, the main development process and its characteristics. 1 design and development. 1 design and calculation. 1. 1 design technical parameters of the working medium: acetic acid; Temperature: 225 ℃; Nominal size: 80 mm; Design pressure: 9. 8MPa。 1. 1. 2 material selection according to the temperature and the concentration of acetic acid, a keen understanding of titanium corrosion rate for < 0. 127 mm/a, compared with corrosion resistant stainless steel and other non-ferrous metals, choose TA2 which conform to the conditions of use; According to the use of work pressure, in order to ensure the structural strength, choose TA2 forgings; According to the using temperature, working pressure, the choice of flexible graphite and leach antimony graphite sealing material. 1. 1. 3 design and calculation, 1) Body wall thickness design USES formula: SB = DN ( K0 - 1) / s + C, the calculation results of 16 mm ( 2) Bonnet and Industrial Valves body between the connecting bolt according to the working pressure, the choice of option 1 cr18ni9ti bolt, select M30mm & times; The 55 mm bolt eight can meet the strength requirement. According to the formula of calculate the inlet and outlet flange connection between the cover and the body bolts with M30mm & times; 45 mm 1 cr18ni9ti bolt eight, can meet the strength requirement. 1. 2 due to the use of pressure as high as 9 key technology. 8 mpa, therefore, the seal and the pressure is the key technology, in the process of development, used the three measures, solved a key technical problem. The coaxial degree of guarantee sphere with clubs up and down; (2) ensure that clubs with up and down & Phi; 80 mm hole of the vertical degree; (3) guarantee spherical surface roughness. By designing special fixture clamping fixture and processing and sealing process, achieving the target of seal with pressure, try a more successful. 1. Three structural characteristics of titanium fixed ball Industrial Valves compared with the floating ball valve has the following three characteristics. （ 1) After sealing on the sealing principle, adopted. （ 2) Suitable for high pressure, viscous liquid. When the common titanium floating ball valve in high pressure is not reliable, the medium for viscous liquid, the tiny floating clearance between the ball and sealing ring is easy to cause congestion, so that the valve opening and closing difficulties or lose the sealing function. Titanium and fixed ball valve, by using the spring, make the seal ring and sphere always maintain close contact, using the high pressure medium for good sealing effect. （ 3) Used line titanium ordinary floating ball valve sealing between the ball and seal ring for spherical seal, the sealing pressure per unit area is small, and under high pressure, micro convex concave point on the surface of the easy cause leakage, can not meet the sealing requirements. Titanium and fixed ball valve between the ball and seal ring USES the wire seal, increases the sealing pressure per unit area, and the higher the pressure, the better sealing effect, thus ensuring the reliability of the high pressure. Conclusion (2 1) Design of the stationary titanium high pressure ball valve, meet the needs of the petrochemical industry, used in good condition. （ 2) Stationary titanium high pressure ball valve has the characteristics of high pressure use reliable, good seal. （ 3) Design of the stationary titanium high pressure ball valve, belongs to the leading domestic, at the technical level and reached the international similar products level.
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