Flow Sensor, Ultrasonic Flow Sensor, Portable Flow Meter manufacturer / supplier in China, offering Hot! ! High Accutacy Portabl Ultrasonic Flow Sensor, Electric / Pneumatic Ball Valve Switch (on-off) , Control Valve (4~20mA control) , Q641 Pneumatic on-off Ball Valve (with solenoid valve, limit switch), Gas Flow Controller-Gas Flow Measurement-Digital Gas Flow Meter and so on.