Check valve floor drain

A removable drain valve for insertion within an inlet opening of a drain basin;

• the removable drain valve having a cylindrical housing with a check valve disposed with an outlet of the drain basin to allow drain water to flow out from the outlet of the drain basin while blocking flow from the outlet of the drain basin to an inlet of the drain basin;
• a cylindrical expander band disposed about the cylindrical housing having first and second ends spaced from each other;
• a cylindrical gasket mounted about the cylindrical housing and the cylindrical expander band;
• and
• a paddle lock lever pivotally mounted within the cylindrical housing;
• first and second connecting rods each mounted at an outer end to the first and second ends of the cylindrical expander band and at an inner end to the paddle lock lever whereby movement of the paddle lock lever can expand the cylindrical expander band and cause the cylindrical gasket to expand and seal against the drain basin.

The method of operating a removable drain valve a drain basin;

• comprising:
• providing the removable drain valve having a cylindrical housing with a check valve;
• mounting a cylindrical gasket constructed of an elastic material about the cylindrical housing to bias a cylindrical expander band into the contracted condition;
• providing a paddle lock lever pivotally mounted within the cylindrical housing having an open position where the cylindrical expander band is biased to a contracted condition and a closed position where the cylindrical expander band is expanded;
• moving the paddle lock lever to the open position whereby the drain valve can be inserted into the drain basin;
• and
• moving the paddle lock lever to the closed position where the cylindrical expander band expands and causes the cylindrical gasket to expand and seal against the drain basin.