Valves with this option have a hand wheel mounted on top of the actuator for manualvalveoperation.
配置这种备选件的阀门在执行器顶部安装一个手轮用于手动阀门操作。
2
Valve shall be installed in accordance with manufacturer's written Installation and OperationManual and approved submittals.
应该按照制造商书面安装和操作手册和经过认可的资料来安装阀门。
3
In addition, the invention further provides a detection method capable of detecting error reason of the pilot valve when the manualoperation device for electric pilot valve breaks down.