ZL47F self-operated balance valve is a valve that uses the pressure change of the medium itself for self-regulation to maintain a constant flow of the medium flowing through the controlled system. The ZL47F self-operated balance valve has a flow indicator and can be adjusted online. It is suitable for flow control of non-corrosive media in heating and air conditioning systems. After one-time test and adjustment before operation, the system flow can be automatically stabilized at the preset set v