Source: https://www.xinhaivalve.com/videos/topper-valve-company-video.html
Topper Industrial Valve Co. Ltd. is a leading industrial valve manufacturing factory in China, who specialized in industrial valve developing & manufacturing.
Topper Valves including gate valve, globe valve, check valve, ball valve, butterfly valve, plug valve and pipe strainer which meets many standards such as API, ANSI, ASME, DIN, JIS, BS, BS EN, ISO etc.