Automatic drainage device for radon mitigation systems

An automatic drainage cover, comprising:

• a sump cover comprising a receptacle having an inlet, an outlet, and an interior surface defining a chamber;
• a drainage device disposed in the chamber, wherein the drainage device comprises:
• a base platform having a valve opening in communication with the outlet of the receptacle, and a valve seat surrounding the valve opening;
• a support structure attached to the base platform, wherein the support structure includes a guide portion defining an aperture axially aligned with the valve opening;
• a valve stem assembly slidingly disposed through the aperture and includes a sealing member engageable to the valve seat to close the valve opening and a pin bore, wherein the valve stem assembly is moveable into a closed position such that the sealing member is engaged to the valve seat and moveable into an open position such that the sealing member is spaced from the valve seat;
• and
• a float assembly having a locking pin selectively insertable into the pin bore of the valve stem assembly to retain the valve stem assembly in the closed position.

A drainage device comprising:

• a base platform having a top surface, a bottom surface, and a valve opening, wherein the bottom surface includes a connector portion surrounding the valve opening and a valve seat between the connector portion and the valve opening;
• a disk-shaped plug engageable to the valve seat to hermetically seal the valve opening;
• a flat rectangular bar having a first end attached to the disk-shaped plug, a second end having a handle, and a pin bore defined between the first end and the second end;
• a spider frame attached to the top surface of the base platform, wherein the spider frame includes a guide portion defining a slot opening axially aligned with the valve opening, wherein the flat rectangular bar is slidably inserted through the slot opening, and wherein the flat rectangular bar is moveable to a closed position such that the disk-shaped plug is engaged to the valve seat and moveable to an open position such that the disk-shaped plug is spaced from the valve seat;
• a pivot body having a block portion and a pair of arms extending from the block portion, wherein the pair of arms are pivotally attached to the spider frame on either side of the slot opening;
• a connecting rod having a first distal end and a second distal end opposite the first distal end, wherein the first distal end is inserted through the block portion of the pivot body to define a locking pin insertable into the pin bore to lock the flat rectangular bar in the closed position;
• and
• a floatable body attached to the second distal end of the connecting rod, wherein the floatable body is liftable by a liquid, thereby pivoting the pivot body to retract the locking pin from the pin bore to release the flat rectangular bar into the open position.