The history of the Valley Wheel brand dates back to the inventor Edmund Copeland, who founded a company in Detroit, Michigan in 1921 and transformed the refrigeration industry with its unique invention. During the Great Depression, Gulun Company was in trouble and was forced to sell its assets, and in 1937 it moved its business to Sidney, Ohio. In Sidney, four young engineers of the company expected possible business opportunities in the future, so they jointly bought the company and the company's compressor patents.

Emerson acquired Gulun in 1986 and continues to promote the company's continuous growth by advancing the enterprising and innovative spirit embodied by the early founders and advocates of the brand. After the acquisition was completed, Emerson made a significant investment in a new scroll compressor product that Gulun was developing and launched the first scroll compressor sold under the Gulun brand in 1987. The product was a success and has transformed the global air conditioning and refrigeration industry with its efficient and reliable performance. Emerson then launched a series of valley rolling compressor products and has gained applications, ranging from household and light commercial air conditioning systems to refrigeration systems in the food and healthcare industries, as well as marine containers.

In May 2023, Blackstone Group (NYSE: BX) and Emerson (NYSE: EMR) announced that they had completed a majority equity transaction in a $14 billion business transaction for Emerson Environmental Optimization Technology. The new independent company will be named after "Copeland", inheriting the brand's century-old history, global brand reputation and influence in the field of HVAC refrigeration. As an independent company focused on serving the global HVAC refrigeration market, Gulun has a global leading product portfolio that provides compressors, controllers, thermostats, valve parts, software and monitoring solutions to residential, commercial and industrial customers, among others. product.