Zhejiang Zeshun Refrigeration Technology Co., Ltd. is a project company of Wenling Hengfa Aircondition Components Co. Ltd. Hengfa company was established in 1986 and has a history of more than 30 years，under it are Zhejiang Zeshun Refrigeration Technology Co., Ltd. and Shanghai Xinao Industry Development Co., Ltd. We are a professional manufacturer of cut-off valve、ball valve、air conditioning pipeline fittings for household and commercial air conditioners, and provide supporting services for domestic and foreign famous air conditioning production companies. Our main customers are Fujitsu General 、Daikin、Hitachi and Japanese companies, and export to TSI America、Rheem America、York America、Daikin America and other companies. Our company with technical team, adhere to people-oriented and scientific and technological innovation concepts, through continuous efforts and more than ten years of research and development tests, successfully develop air conditioning self-balancing expansion valve, the self-balancing expansion valve is fully applicable to cooling and heating from low to high global flow regulation，achieve 11 functional requirements，and win a number of national invention patents and utility model patents.