| 摘要 |
The pneumatically operated cylinder (1) with a connection (7) on the end of its piston rod (6) for operating the swinging flap of a blower uses two pistons (5) in two chambers (18) filled with a hydraulic fluid. Between the two chambers is a hollow partition, containing a spring-loaded plunger (10) controlling flow of fluid between the two chambers. At each end of the cylinder is an opening for a pneumatic supply line (14, 15), the two lines controlling the travel of the double piston. Each line has an auxiliary side outlet (16,17) for moving the plunger between blocked and unblocked position against holes (13) through the partition.
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