HOHO.. Trains are not pushed.. Bullshit shouldn't be spread. There are a lot of Chinese-related introductions about ball valves.. And quite a few companies produce them. Especially in Yongjia, Wenzhou, and Yuhuan. However, there is very little information in English. Even less on ball valve baike (encyclopedic information). The site recommended here can be a good resource if you're looking for some ball valve baike information.