VALVE WITH BUILT-IN HEATER

摘要

A valve with a built-in heater usable even under a high temperature exceeding 200°C. A piston drive means (7) has an upper compressed air introduction chamber (24) for moving a piston (6) downward and a lower compressed air introduction chamber (25) for moving the piston (6) upward. A piston seal means (8) includes an upper bellows (29) for sealing the upper compressed air introduction chamber (24) and a lower bellows (30) for sealing the lower compressed air introduction chamber (25).