ZLF self-balancing valve is a kind of valve which uses the pressure change of medium itself to self-regulate so as to keep the flow through the controlled system unchanged. ZLF self-balancing valve has flow indication and can be adjusted online. It is suitable for flow control of non-corrosive medium such as heating and air conditioning system. The one-time test adjustment before operation can make the system flow automatically constant at the pre-set set value. The valve has the advantages of accurate flow regulation, simple operation, smooth operation, reliable performance and long service life.