ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,173, issued on May 27, was assigned to Parker-Hannifin Corp. (Cleveland).
"Enhanced low noise, low leakage relief valve" was invented by Gerard G. Betz II (Eden Prairie, Minn.), Anthony F. White (Crystal, Minn.) and David Walter Zuk (Blaine, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An enhanced low noise relief valve renders the anodizing processing irrelevant to the low leakage nature of the valve member based on the tolerance between the tube portion of the valve member and the inlet bore of the machined housing. This is accomplished by providing an additional valve stem holder that acts as a stem holder through which at least part of t...