Eaton priority valves can be used with open centre, closed centre or load-sensing systems. Use in an open centre system with a fixed displacement pump, or a closed centre system with a pressure compensated pump, offers many of the features of a load-sensing system.
There are two types of load-sensing signal systems: static and dynamic. In a static signal system, the pump and priority valve sense a static pressure in the sensing line. Static signal systems are used for conventional applications in which response or circuit stability is not a problem. In a dynamic signal system, the pump and priority valve sense boosted pressure in the load-sensing line caused by the spring and a small amount of flow through the dynamic signal orifice from the control flow line. Used with fixed or variable displacement pumps, the dynamic signal system offers several advantages, including faster steering response, improved cold weather startup performance and increased flexibility to optimise system performance and stability.