Visiting to USA via China

I will be travelling to Shanghai (China) under Business m for a week. I wish to visit USA under Tourist l, after completing business meetings in China. After one week stay in USA, I wish to return to Shanghai. I will not enter into the city, but will be taking a flight from Pudong (Shanghai) to Mumbai.

I will be having tickets of separate airlines (Mumbai -> Shanghai -> Mumbai by one airlines & Shanghai -> USA -> Shanghai by different airlines.

1. I wish to know, if a single entry business visa can be ok in the above case, for the transit through Pudong (Shanghai) airport ?

Please guide. Thanks,