ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,990, issued on Nov. 18, was assigned to ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT Co. LTD. (Shaoxing, China).
"Valve device" was invented by Zhongbo Feng (Shaoxing, China), Ju Jin (Shaoxing, China), Fugang Wang (Shaoxing, China), Wenrong Zhang (Shaoxing, China) and Zhiguo Song (Shaoxing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A valve device is provided, including a valve body unit and a valve seat. The valve seat is provided with a mounting cavity, and an end of the valve body unit is mounted in the mounting cavity. The valve device further includes a limiting unit, an outer side wall of the valve seat is provided with a mounting hole in c...