Changzhou Match-Well Pressure Control Technology Co., Ltd. was estabilished in 1994, which is the biggest pressure control manufacturing factory in China. It is the only legal owner and user of the trademark of the China famous brand name"Changheng". The products are mainly used for high-low pressure protection of residential and commericial air-conditioners, auto air-conditioners and some other industrial equipment. Its high class quality and service are widely recognized by the domestic and overseas customers and thus its brand is widely chosed by many big refrigreration companies in China, which makes its market share over 70% in China. Its pressure switch products are selling to many countries and regions in North America, Europe, Mid-east and Asia.