ALEXANDRIA, Va., April 15 -- United States Patent no. 12,601,423, issued on April 14, was assigned to Fisher Controls International LLC (Marshalltown, Iowa).
"Control valves with adjustable valve packing" was invented by Yan Qiu (Marshalltown, Iowa).
According to the abstract* released by the U.S. Patent & Trademark Office: "An example apparatus is disclosed herein comprising a valve that includes a valve body defining a fluid passageway between an inlet and an outlet, a flow control member in the fluid passageway, a stem coupled to the flow control member, and a bonnet coupled to the valve body. The stem extends through a channel in the bonnet. A section of the channel forms a bore. The bore is threaded. The apparatus includes packing in...