Heating centralized is an important thing in the north . whether this is implemented in a large scale has contributed to impove city modern level and ameliorate atmosphere environment . the traditional heating system are two - upright - pipe - parallel system , two - pipe system , single - pipe - stride system etc , whose calculation for heat charge is either by man or by ic installed on the caliduct . therefore , the problem arise that heat provided does n ' t accord with heat charge payed , not secure , and resident have to suffer much 传统的供暖系统有双立管水平式系统、全双管系统、单管跨越式系统等，其计费方式要么为人工计费，要么是利用安装在暖气片上的带电读卡器，这样存在着供热量与收费额匹配不准确、不安全等方面的问题，也使集中供热用户有苦难言。
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In this paper , a safe , reliable , and intellectual control plan is provided aiming at the heat charge for dwelling district , which contains epigynous machine responsible for data processing and hypogynous mahcine responsible for unlocking the valve , by means of serial communication between them , combining homemade three - channel valve , to adminstrate the charge data and the valve efficiently . the main idea is based on the homemade three - channel valve . the vavle is locked at peacetime , while it is opened with the help of open tool and a water flow in the caliduct . as soon as the flow stops , the valve locks automatically . the open tool has data in its memory , and implement function by lcd and keyborad . so it can identify data and drive motor , to open the valve intellectually . the epigynous machine database manage system administrator the dweller information , standard heat charge and payment infomation etc , including store , configure , query , print etc , then store in the memory of open tool . as a result , the plan can do well in the experiment 此阀平时是锁闭的，只有用开启器配以暖气片中的水流才可打开，一旦水流断开，则此阀会自会锁闭。而开启器则是根据其存储器中的数据配以液晶显示及小键盘，完成数据确认及电机驱动，自动对相应用户的三通阀打开特定角度，完成开启任务。上位机数据库管理系统完成对用户信息、热费标准、缴费信息等原始数据的常规管理，包括存储、设置、查询、打印等,最后将处理后的数据传到开启器中存储。
