An air lock is gas trapped in a high point of a liquid-filled pipe system. The gas, being lighter than the liquid, rises to the highest point and restricts the flow of liquid. In very tall systems, the gas can prevent flow entirely.
Flushing the system with high flow or pressures can help move the gas away from the highest point, or a tap can be installed to permit the gas to be vented.
Famous quotes containing the words air and/or lock:
“Make me a willow cabin at your gate,
And call upon my soul within the house;
Write loyal cantons of contemned love,
And sing them loud even in the dead of night;
Halloo your name to the reverberate hills,
And make the babbling gossip of the air
Cry out “Olivia!” O, you should not rest
Between the elements of air and earth
But you should pity me.”
—William Shakespeare (1564–1616)
“As soon as you are in a social setting, you better take away the key to the lock of your heart and pocket it; those who leave the key in the lock are fools.”
—Johann Wolfgang Von Goethe (1749–1832)