Yuhuan Tonghui Valve-Pipe Co., Ltd. iso 9001 certified, is one of leading companies here located in Zhejiang China who is specialized in manufacturing various categories of hydraulic pipe fittings and adaptors made from carbon steel or stainless steel according to American SAE, British BS, German DIN, Japanese JIS and other specified standards as well as diversified safety valve parts & components and also ball valves since the year of 2003.