On April 20-22, the 22nd Shanghai World Expo in 2021 officially opened at the Shanghai New International Expo Center. This exhibition is the most influential and highest-quality environmental protection technology and equipment exchange event in Asia. Firsquare is actively preparing for this show. This time we mainly showed the valve products of stainless steel with Teflon coating inside, which was unanimously praised by the majority of visitors and industry insiders!