How is this design different from regular wafer check and what are High performance Duo wafer check?

A duo check valve is considered a sub-category of the wafer check valve. The main characteristic of a duo-check is that the disc is split in two, and opens similar to a butterfly valve. The original/standard wafer check only has 1 disc.

Here's a link to an image of a duo check:
http://www.aguamarket.com/sql/productos/fotos/V%C3%81LVULA%20RETENCI%C3%93N%20DUO%20CHECK.JPG.

Here's a link to an image of a "standard" wafer check:
http://upload.ecvv.com/upload/Product/20095/China_Wafer_Check_Valve20095515271310.jpg.

Most wafer checks nowadays are duo style.

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