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FLOWSPEC ZY47 type self-operated differential pressure control valve is one type of valve which depends on the medium self pressure change to take its self regulation, and then to keep the flow differential pressure through the system constant. ZY47 type self-operated differential pressure control valve is applicable to twin pipe heating system for controlling the system differential pressure, making sure the system differential pressure constant basically, reduce noise, balance resistance, and eliminate heat supply network and hydraulic disorder.