| 摘要 |
<p>Electropneumatic position controller having two solenoid operated pneumatic valves, each of which is respectively provided with a regulating pressure nozzle, an exhaust nozzle, a discharge line leading to a power amplifier, and a hinged armature that is driven by an electromagnetic system and alternatively closes the regulating pressure nozzle or the exhaust nozzle, characterized in that the solenoid valves each respectively comprise a channel that communicates with their exhaust nozzle and can be manually closed, the respective power amplifier being capable of being switched as a result of the closing of said channel even without electrical excitation of the magnet system.</p> |
