Valves with Pilot Assist: Design has an additional area that assists in moving the main piston, effectively reducing the relief setting. The pilot area can be of equal or greater proportional magnitude compared to the relief area. The pilot ratio is a comparison of the pilot area to the relief area.Pilot ratios provide a means to reduce the horsepower consumed while providing a proportional degree of control of the actuator.The valve is opened by a combination of load induced pressure plus pilot pressure