As one of the stop valve manufacture bases with the largest output and most completed products around the world, Zhejiang Sanhua Co., Ltd. is mainly engaged in residential and commercial ?? ?air conditioner automatic control devices and its products scope include stop valve, electronic expansion valve, solenoid valve, check valve, ball valve, square valve and other residential and commercial AC supporting products. As of 2011, the company’s capacity includes 50 million sets stop valve, more than 40 million sets four-way valve, 7 million-8 million sets electronic expansion valve. Stop valve and four-way valve are the company’s preponderant traditional products, and solenoid valve (mainly household solenoid valve) and electronic expansion valve are the company’s major products over recent years.