These relief valves crossed are used to limit the pressure on both sides of a cylinder or a hydraulic motor at a given pressure. They are primarily used as both shock valves that to adjust with two different calibrations of the two branches in Pressure. The outer body is made of high-strength steel and externally protected from oxidation with a zinc treatment, it is possible to apply a surface treatment Zinc/Nickel to increase the resistance to oxidation, in the case where, for example, the valve is not very protected and exposed to the weather.
