Valter, 22, broke free during the final few kilometers and the peloton was unable to catch him.
There were also second round wins for fourth seed Stefanos Tsitsipas of Greece, fifth seed Alexander Zverev of Germany and seventh seed David Goffin of Belgium.
"I cannot begin to explain how incredible an opportunity it is to join a club with such an amazing history. I would like to thank everyone at Ajax, I grew up there and I will always have a special bond with the club. I am now ready to take the next step in my career and perform at the highest level and there is no higher standard than Manchester United," said Van de Beek on the Manchester United website.
Before the game, Dalian ranked seventh with six points in the eight-team division, while Henan, also on six points, sat at the bottom by virtue of their inferior goal difference.
Jumbo Team's Van Aert produced a powerful sprint in the slight uphill finish to win by half a wheel ahead of Cees Bol and Sam Bennett.
The 23-year-old, who has previously been linked to interest from Spanish giants, Real Madrid and FC Barcelona, has agreed a contract until June 2025. He will travel to Manchester to join his new teammates after the Netherlands' UEFA Nations League game against Italy on September 7.
A source told Xinhua, they have paid 50 percents of the negotiated fees at the initial stage of the three-year circle.
The result lifted Flamengo to fifth in the 20-team standings, five points behind leaders Internacional
LONDON, Sept. 3 (Xinhua) -- Real Madrid's Welsh international forward Gareth Bale says he would be open to returning to the Premier League but insists that so far Real Madrid have blocked his attempts to leave.
PARIS, Sept. 2 (Xinhua) -- British rider Adam Yates took the lead of the Tour de France after home title favorite Julian Alaphilippe was given a 20-second penalty in Wednesday's stage five, which was won by Belgian Wout van Aert.
In the 48th minute, the Venezuelan striker assisted Swedish winger Sam Larsson to stretch the lead for Dalian.