What is a hydraulic float valve?

Hydraulic float valves on earth moving equipment allow the operator the ability to contour the landscape and improve the final grade with certain implements, such as dozer blades, by providing continuous, controlled hydraulic pressure to the raise side of the lift cylinder. In addition to producing the desired result a hydraulic valve in the float position saves horsepower by not "digging-in" and reduces wear on any ground-engaging components.