control valve for Trane air conditioners in the United States.

Since 2006, the company has been the only domestic enterprise in the air treatment industry to obtain national military standard certification, supplying sealed air volume control valves for lithium battery dehumidification units to multiple large lithium battery manufacturers.

In 2018, the airtight volume control valve passed the inspection of the National Air Conditioning Equipment Quality Supervision and Inspection Center, with its airtight performance data leading the industry.

In March 2023, the stainless steel hermetic opposed blade damper passed tests conducted by the National Air Conditioning Equipment Quality Inspection and Testing Center and the Building Environment and Energy Testing Institute of Jianke Huaneng Technology Co., Ltd. It ranked top in leakage rate among similar products in terms of sealing performance. Simultaneously, the cigar leaf push rod louver also passed the testing.

In April 2023, Bielian Tree airflow regulator supplied stainless steel airflow regulators to the National Air Conditioning Key Laboratory, and was designated as the preferred brand of accessories for Hebei Jinyinhua Industry's heat pump drying machine. That same year, it was selected for inclusion in the "Guide to the Top 100 Enterprises in China's Heat Pump Drying Industry" and received a key recommendation from the editorial committee.