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The control of the external circulation pump to ensure the constant pressure in the heating system is the basic prerequisite for the normal operation of the heating system. The Pipe Network of heating system is usually a closed pipe system, theoretically speaking, the consumption of water is very small. However, in practice it is difficult to avoid running, running, dripping, leaking and artificial water loss, which will inevitably affect the stability of system pressure. In addition, the temperature of water flow in the system also affects the pressure change. In order to keep the system stable, the system must be in the state of full water, and the pressure can not exceed the system's bearing capacity. To achieve this, we need to determine a constant pressure point in the backwater pipe of the system, in the course of the system cycle, to maintain a stable pressure value, so that the circulation pump flow, head limit in a certain range, to achieve flow, lift automatic regulation, to a certain extent, the boiler system can also avoid overtemperature and overpressure. The constant pressure of the system can be adjusted smoothly by using the frequency-conversion speed-regulating make-up pump, and the volume of water in the system can be guaranteed.
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大蘿卜，水靈靈， 小白菜，綠瑩瑩， 西紅柿像燈籠， 黃瓜一咬脆生生， 多吃蔬菜身體好， 壯壯實實少生病。
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