The function of the one-way valves is to allow the free flow of the oil in one direction and block it in the opposite direction. The VUR SAE series includes check valves with UNF-SAE threaded F/F ports with poppet seal. Depending on the size chosen, the valves of the VUR-SAE series can be installed in systems with working pressures up to 400 bar (5800 PSI) and flow rates up to 430 lpm (113.5 gpm). The external body is made of high-strength steel and protected from corrosion by galvanizing. Calibrations other than the standard and Zinc-Nickel surface treatment are available on request.