by de-energizing solenoid valves 如何理解? emergency shutdown functions shall be actuated by de-energizing solenoid valves to vent pneumatic actuators on separate shutdown valves . use of control valves as shutdown valves is allowed, if necessary, under special circumstances. 这个to是介词 (de-energize to) 还是不定式to vent呢?(好像是后一种) 电磁阀失电怎么就vent 气动执行器呢?这与停车又有何关系呢? 查看更多