Lubricators
Oil is often added to the air to lubricate moving parts, the oil is released as a fine mist into well dried air, if the air is poorly dried then the oil will mix with the moisture and become tacky which will cause problems sticking valves ect.
The oil is drawn up from the oil reservoir due to the way the air flows through the lubricator; a pressure difference between the lower and upper chambers is created as the air is channelled down past the oil mist opening. The screw valve is used to adjust this pressure difference.
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