Stationary titanium ball pneumatic valve design and development

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 pneumatic valve and pump. The fixed pneumatic ball valve, cast iron with good sealing, excellent corrosion resistance and adapt to the characteristics of high working pressure, widely used in petroleum, chemical industry. Developed a DN, DN, DN, DN, and use up to pressure. MPa stationary titanium ball pneumatic 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.
this paper stationary titanium ball design and calculation process of pneumatic valve, the main development process and its characteristics.

the design and development.
design calculation. 。 Design parameters:
medium of acetic acid;
use temperature: ℃; :
the design pressure. MPa； Mm:
nominal diameter.
。 。 Material selection
according to the temperature and the concentration of acetic acid, a keen understanding of titanium as < corrosion rate. Mm/a, compared with corrosion resistant stainless steel and other non-ferrous metals, choose TA which conform to the conditions of use; According to the use of work pressure, in order to ensure the structural strength, choose TA forgings; According to the using temperature, working pressure, the choice of flexible graphite and leach antimony graphite sealing material.
。 。 Design calculation
( ） The design of the pneumatic valve body wall thickness
the formula: SB = DN ( K - / s + C, the calculation results for mm
( ） Pneumatic valve cover and the choice of pneumatic valve body between the connecting bolt
according to the working pressure, choose CrNiTi bolt, selection of Mmm x mm bolt can meet the strength requirement.
according to the formula of calculate with pneumatic valve body between inlet and outlet flange cover connected with Mmm x mm CrNiTi bolt, can meet the strength requirement.
。 Technical key
due to the use of up to pressure. MPa, therefore, the seal and the pressure is the key technology, in the process of development, adopt measures, solved a key technical problem.
the coaxial degree of guarantee sphere with clubs up and down;
2. Ensure that clubs up and down and verticality Φ mm hole;
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.
。 Structural characteristics of the
titanium stationary ball pneumatic valve compared with the floating ball pneumatic valve has the following characteristics.
( ） After sealing on the sealing principle, adopted.
( ） Suitable for high pressure, viscous liquid.
ordinary floating type titanium ball unreliable when pneumatic valve in high pressure, the medium of viscous liquid, the ball with the tiny floating space between the sealing ring is easy to cause congestion, so that the pneumatic valve opening and closing difficulties or lose the sealing function. Pneumatic valve and fixed titanium ball by using spring, make the seal ring and sphere always maintain close contact, using the high pressure medium for good sealing effect.
( ） Use line seal
titanium ordinary floating ball pneumatic valve 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. And stationary titanium ball pneumatic valve adopts the line between the sphere and the sealing ring 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

( ） Design of the stationary titanium high pressure pneumatic valve, ball meet the needs of the petrochemical industry, used in good condition.
( ） Stationary high-pressure pneumatic valve is reliable in high pressure using titanium ball, good seal, etc.
( ） Design of titanium stationary high-pressure pneumatic valve, ball in technology is a leading domestic level, and reached the international similar products level.

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