Series U5B water pressure reducing valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. This series is suitable for water supply pressures up to 300 psi (20.7 bar) and may be adjusted from 25 - 75 psi (172 - 517 kPa). The standard setting is 50 psi (345 kPa). All parts are quickly and easily serviceable without removing the valve from the line. The U5Bs standard bypass feature permits the flow of water back through the valve into the main when pressures, due to thermal expansion on the outlet side of the valve, exceed the pressure in the main supply.