Automatic drain system

An automatic drain valve for removing condensate from compressed air systems comprising:

• a reservoir housed in a transparent or translucent housing for accumulating condensate from a compressed air system, said reservoir having a liquid inlet the entry of liquid condensate and a liquid outlet for the discharge of accumulated condensate;
• an air discharge tube having an entrance within the reservoir;
• a first lever arm and a second lever arm within said reservoir, each pivotally mounted on a fixed pivot means said first lever arm having a float attached thereto, said float being responsive to a liquid level in the reservoir, said second lever arm having a weight attached to one end thereof, an opposite end of said second lever arm being aligned over said float so that as said liquid level rises, said float is buoyed upwardly raising said opposite end of said second lever arm;
• a seal means attached to said second lever arm and positioned in alignment with said entrance to said air discharge tube so that as said opposite end of said second arm is in a lowest position, said seal rests upon said entrance, preventing a flow of air therethrough, and when said opposite end is at a highest level, said seal has been lifted from said entrance, allowing the flow of air therethrough;
• a tether connecting said first lever arm and said second lever arm so that as said liquid level lowers and said float lowers, said tether is stretched and said opposite end of said second lever arm is pivotally lowered and said second seal is lowered onto said entrance, preventing air flow therethrough;
• a magnet means providing an attractive magnetic force between said float lever arm and said entrance to the air discharge tube holding said seal on said entrance, preventing air flow through said air discharge tube, until a bouyant force on said float is sufficient to overcome said attractive magnetic force;
• an air cylinder mounted on the outside of said housing and in fluid communication with said air discharge tube;
• a valve for opening and closing said liquid outlet, said valve being responsively connected to said air cylinder and controllably opened and closed in response to pressure from air exiting through said air discharge tube to said air cylinder in response to changes in the liquid level in the reservoir.