SP45、15Fmodel digital lock balance valve is a have digital lock special function control valve, use through way body structure, have better equal percent flow rate feature, can reasonable assign flow rate, also can effective slove problem of  heat supply(air conditionor) system exist house temp. uneven. At same time, it can accurately regulate pressure drop and flow rate, used to change pipeline fluid status, achieve purpose of balance pipeline liquid and save energy. Valve have open position indicator, position lock device and small valve for flow rate test, so only need install proper balance valve on each brance pipe and client inlet, and use special intelligent meter lock after one-off  regulation, make system total water volume controlled in reasonable range, so avoid unreasonable case of "large flow rate, low temperature drop". This product is a desired product for heat supply system. SP45 model balance vlave not only can be installed on water supply pipe, installed on water return pipe also is available, normally we advise installed on water return pipe, especially for high temp. circle pipeline, in order to easy degug, installed on water return pipe is more requested, don't need install globe valve again when the water supply(return )pipe already install balance valve.