发明授权
US4507919A Fail safe actuator 失效
故障安全致动器

Fail safe actuator
摘要:
A fail-safe actuator mechanism has an actuator housing encapsulated within a tank which stores a pressurized fluid media. Ports of the actuator housing are put into selective fluid communication with both the interior and exterior of the encapsulating tank by a valve at selective pressures.
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