Importance

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Abstract

The invention provides an improved drain valve for dew condensation in an air chiller unit mounted on an aircraft. The drain valve 160 attached to a drain of a drain pan in an air chiller unit is equipped with a valve seat member 162 having an opening 162a at the center and a valve member 164 disposed to contact the lower surface of the valve seat member 162. The valve member 164 is made of thin silicon rubber, and arms 164b created by slits formed thereto support a valve means 164e with extremely small spring constant. While the air chiller unit is operating, the valve means 164e is air tightly attached to the opening 162a of the valve seat by negative pressure, closing the drain valve. When the operation stops and dew drops gather on the valve means 164e, the valve means 164e is displaced by the weight and the valve is opened. When there are no dew drops, the valve is closed to prevent moisture from entering.

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First Claim