Central heating constant pressure water supplementing system

The utility model discloses a central heating constant pressure water supplementing system, including once netting return water pipe, secondary network return water pipe and escape canal, once net and be equipped with the moisturizing pipeline between return water pipe and the secondary network return water pipe, be equipped with moisturizing actuating mechanism on the moisturizing pipeline, be equipped with drainage pipe between secondary network return water pipe and the escape canal, the last sluicing actuating mechanism that is equipped with of drainage pipe, moisturizing actuating mechanism and sluicing actuating mechanism all are connected with moisturizing secondary network 4 ware, are equipped with the pressure change between moisturizing secondary network 4 ware and the secondary network return water pipe and send the device. The utility model discloses a system automation degree is high, and system's link is few, and the response is fast, and system's operation is stable, save heat exchange station'