The need for air removal

Bubble generation
When water is drained from the piping, the amount of replenishing water is increased, and the dissolved air is generated as air bubbles. In the case where water is collected in the open circuit in the open circuit, air is sucked in due to a vortex at the suction port, air is drawn into the water due to the influent shock between the water surface and the discharge port, There is a very small particle bubble.

Air intrusion occurred
The pressure distribution in the piping deteriorates, and the air is sucked in from that part due to poor piping connection and clearance at the valve. If the piping on the suction side is below the atmospheric pressure during pump operation, air enters through the piping or the shaft of the pump. Even if you do not completely remove the air when you first load the water, the air will enter.

Air pocket phenomenon occurred
If a large amount of air stays in the piping, the flow path becomes narrow and the flow rate decreases. In severe cases, water circulation may be blocked. Due to the shortage of flow rate, heat exchange area of heating and cooling equipment is reduced, which causes serious problems in heating and cooling.

Occurrence of noise and vibration
As the water vortex or air disturbance causes vibration such as water hammer or pulsation, and when air is sucked in, the volume flow rate must be large so that the flow rate is increased and the friction noise is rapidly increased.

Promoting corrosion in piping
As the water vortex or air disturbance causes vibration such as water hammer or pulsation, and when air is sucked in, the volume flow rate must be large so that the flow rate is increased and the friction noise is rapidly increased.

Insufficient pump operation
As the air is mixed, the operation of the pump becomes unstable due to the surging and cavitation phenomenon. In some cases, the pump impeller may be damaged in a short period due to corrosion.