What about Shandong United Valve Co., Ltd.?

Not so good. Hong Shuxin, the owner of Shandong United Valve, has no production qualification. Leather bag companies, including Shanghai Valve Factory No.2, Shanghai Valve Factory No.5, Beijing High School Pressure Technology and Shandong Huadian, among which Shanghai Valve Factory No.2, Shanghai Valve Factory No.5 and Beijing High School Pressure Technology have no production qualification, and Shandong Huadian has no production qualification. They all export goods from other countries and label their own brands. The product is basically not after-sale, and the problem is not solved.