在热网系统内,由于采暖设备、管道的大修和更换、采暖负荷的增减、在每个采暖期内阀门的开度不同等因素,都会引起水力工况的变化,使热网系统内各采暖建筑物实际供水量偏离设计供水量,产生各采暖建筑物之间的热力工况失调——栋与栋(或厂房、车间)之间的冷热不均,这是热网运行调节的重要内容。目前,国内很少每栋采暖建筑物都安装流量仪表或自动调节裟置,而是靠进户阀门控制 In the heating network system, due to factors such as the overhaul and replacement of heating equipment and pipelines, the increase or decrease of heating load, and the difference in valve opening during each heating period, changes in the hydraulic operating conditions will be caused, resulting in various thermal network systems. The actual water supply volume of heating buildings deviates from the design water supply volume, resulting in a misalignment of the thermal conditions between heating buildings—uneven heating and cooling between buildings and buildings (or workshops, workshops). This is an important adjustment of heating network operation. content. At present, few domestic heating buildings are equipped with flow meters or automatic adjustments, but rely on inlet valve controls.