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FLOWSPEC ZL47F type self-operated balancing valve depends on the medium self pressure change to take its self regulation, and then to keep the flow through the system balance. ZL47F type self-operated balancing valve has flow indicating and online regulation function, which is applicable to non-corrosive mediums flow regulation in heating and air-conditioning system. Just need one-time adjusting can keep automatically the system flow on the preset flow value. ZL47F type self-operated balancing valve has accurate adjusting, simple and stable operation, reliable performance and long service life.