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According to the equipped control actuator, it can be divided into three types: electric control valve, pneumatic control valve, and self operated control valve 1. The valve is driven by compressed clean air, and the threaded connection is used to correspond to the pipeline., Left spring extends B. Dual electric control schematic diagram Dual electric control solenoid valve controls opening and closing through power on and power off of solenoid coils on both sides. 2. Rust on valve stem threads. When accidentally closing a valve that is normally in an open state, due to rust on valve stem threads, it can also occur that the valve is not tightly closed.





















