| 摘要 |
<p>A pneumatic control system is provided for selectively controlling movement of a pneumatically-operated device (20) between first and second working positions. The pneumatically-operated device (20) includes a working portion (30) and a pneumatic-control portion (32). The pneumatic-control portion (32) is in fluid communication with a pressurized fluid source (26) and includes a series of valves (64,66,70) for selectively manipulating the working portion (30) between the first and second working positions. The pneumatic-control portion (32) further includes a sensing system (56,58) for holding the working portion (30) in a static mode by selectively applying system pressure to the working portion (30). In this manner, a more energy efficient system is provided by eliminating the need for continuous application of full line pressure. <IMAGE></p> |
