When the pressure of heating system is high, the water tank can not guarantee the pressure required by the system. At this time, the way of constant pressure of supply pump should be adopted. This constant pressure method is widely used in the heating system of hot water stove in the Soviet Union. There are two ways of constant pressure of supply pump: continuous water supply and constant pressure of continuous water supply. The installation of the constant pressure mode of the biomass hot blast stove consists of a supply water tank, a supply water pump, a pressure regulator, etc. When the system is in normal operation, the pressure regulator is used to make the supply pump continuously replenish water and make it conform to the leakage of the system, so as to maintain the stability of the system pressure. When the circulating pump is out of operation, the shutoff valve in front of the pressure regulator can be closed. The replenishment pump continues to replenish water to maintain the static pressure required by the system. 这种定压方式无需收缩水箱，因此设备费用低廉，此外，补给水泵又补水又定压，水泵功率不大，运转费用也很小。因而，这种方式在我国热水供热系统中应用相当普遍。
This constant pressure method does not need to shrink the water tank, so the cost of equipment is low. In addition, the supply pump is also constant pressure, the pump power is not large, and the operation cost is small. Therefore, this method is widely used in China's hot water heating system.
The great defect of this constant pressure method is that if the power system is suddenly cut off, the supply pump will lose its constant pressure function. In order to avoid the water shortage and vaporization of the hot blast stove at this time, the manufacturer of the special boiler for aquaculture said that the auxiliary installation of pressure water was adopted in the system. When the circulating water pump was running, the circulating water would not be poured back into the pressure rising system because of the auxiliary installation of the water supply. When the circulating water pump and the supply water pump are shut down due to a sudden power failure, the pressure water supply system is put into operation immediately, the check valve is automatically opened, and the pressure water will flow through the hot air stove and be discharged from the gas collecting tank, thus preventing the boiler water vaporization caused by the residual heat of the furnace chamber.
At the same time, the operation is to close the main valve of the supply and return water pipe so as to isolate the heat source from the heat network. When the pressure is lower than this range, the electric contact pressure gauge acts and connects the motor circuit of the supply water pump. When the supply water pump runs, the supply water pump runs, the supply water is supplied, and the inlet pressure of the hot water circulating pump rises and exceeds a certain range, the hot water hot air stove's inlet pressure can be controlled by the electric contact pressure gauge. Pressure gauge is to cut off the supply pump power supply, is the supply pump shutdown.
Such reciprocating action, the supply pump continuously replenish water, and maintain the system pressure to shake in a certain range, so that the system constant pressure mode, because of continuous replenishment of water, is more economical than continuous replenishment of electricity, but its conditioning and pressure quality is worse than continuous replenishment mode, there are pressure fluctuation, pressure gauge contact action frequent and easy to damage and other defects.
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