Imported pneumatic regulating ball valves, equipped with Siemens simulated quantity pneumatic ball valves, consist of high-precision pneumatic actuators and precision cast ball valves. Mainly divided into two categories: pneumatic soft-seated ball valves (≤200°) and pneumatic hard-seated ball valves (≤550°). Pneumatic ball valves feature compact structure, small size, reliable operation, low flow resistance coefficient, good sealing, easy maintenance, convenient installation, and strong adaptability. Pneumatic ball valves can be equipped with stroke limit switches, solenoid valves, pressure reducing valves, and a gas source of 0.4-0.7MPa to achieve switching operations and send out two pairs of passive contact signals indicating the valve's state. Pneumatic flanged ball valves are particularly suitable for media that are viscous, granular, or fibrous in nature. They are widely used in industrial automatic control systems such as petrochemicals, light industry, papermaking, and high-pressure equipment, for remote centralized or local control. Product features:
(1) Fluid resistance is low; among all valve types, ball valves have the lowest fluid resistance. Even for reduced bore ball valves, the fluid resistance remains quite low.
(2) Thrust bearings reduce the friction torque on the valve stem, allowing for long-term balanced and flexible operation of the valve stem.
(3) The valve seat has excellent sealing performance. The sealing rings are made of materials like polytetrafluoroethylene, which are easy to seal. Moreover, the sealing capacity of the ball valve increases with the increase of medium pressure.
(4) The valve stem seal is reliable. Since the valve stem only rotates and does not move up and down, the stuffing box seal of the valve stem is less prone to damage, and its sealing ability increases with the increase of the medium's pressure.
(5) Due to the excellent self-lubricating properties of materials like polytetrafluoroethylene, the friction loss with spheres is minimal, thereby extending the service life of ball valves.
(6) The lower part of the valve stem and the stepped head prevent the stem from being ejected. In case of a fire causing the stem seal to fail, a metal contact can still be formed between the stepped head and the valve body, ensuring the stem seal remains intact.
