タイトルまたは説明

easy to install, no complex electrical control part sensing agencies, the fault is not easy to set simple settings adjustment function automatically, without manual or other power source.
3. Principle: The pilot valve of the valve orifice obtain from the differential pressure signal to control the main valve of the switch. When the pipe flow greater than the set flow rate, the main valve open for smaller, flow back to the original set value, the valve was reluctant.