Self-reliance type flow regulator is a new regulator types, relative to the manual control valves, its advantage is that it can automatic regulation; Relative to the electric regulator, its advantages is not to need the power department, application practice has proved, in closed water cycle system. （such as hot water heating, air conditioning freezing system）, the correct use of the valve can be easily realized the flow distribution system; The system can realize the dynamic balance of; Simplify the adjustment of the system; The working state of the pump can be stable. Therefore, self-reliance type regulator in heating air conditioning project has wide application prospects. Self-reliance is the role of flowmeter regulator in the import and export of valve differential pressure change, maintain by the flow valves is constant, thus maintaining the series with the controlled objects （such as a loop, a user, a equipment, similarly hereinafter） flow is constant, self-reliance type the name of the flow control valves more, such as self-reliance type circuit balancing valves, constant flow valves, since the balancing valve, dynamic balancing valve and so on, all types of self-reliance type flow control valves, structure each have a different, but the work principle of which is similar.

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