| 摘要 |
<p>The pneumatic or hydraulic control element has the piston (11) driven directly by expansion element (30) each side of the piston and powered by a servo force. The servo force can be controlled by an induced energy system, by direct heating of the drive elements or by a rapidly evaporating fluid heated by integral heaters. The piston is driven by a fast reaction process which uses a minimum of components.</p> |
