e. Air Vent Valve
The mini chiller unit has an automatic air vent located on top of the buffer tank. This is to
release any trapped air inside the tank which may cause problem to the pumping operation.
This is especially so during heating operation where oxygen and hydrogen gases are formed
from the water and gets accumulated inside the tank. Air entrainment and microleaks along
the joints and valves of the pump suction line will also cause air to enter the water system.
Therefore, it is a good practice to install another air vent at the highest position
of the piping
network to ensure that the pump performance do not deteriorates.
Such air vents are also useful during commissioning and system start-ups to release any
air trapped in the piping system.
Always install the valve in a vertical position on top of a tank or pipe.
pipe
air vent
air vent
CORRECT INCORRECT
Under normal condition, water will enter inside the valve and lifts a floating body
which will raise a mechanism to close a pin-shutter. Reduction of the water level
as a result of accumulated air will cause the float to drop and opens the pin-shutter
thus releasing the air automatically.
float body
pin-shutter opens
Air venting Normal
Section 3 Page 54
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