| 摘要 |
<p>Pneumatic valve operating mechanism (10) has a housing, a cylindrical liner (28) whereby front walls (20,24) are present on both ends of the cylindrical liner. A spindle (34), which is connected with piston (30), is axial to the cylindrical liner and its circumference is sealed against the cylindrical liner. A control module (10) is provided which covers a pneumatic and/or electric control means.</p> |
