FLUID CONTROL SYSTEM FOR ROADWAY GROOVING APPARATUS

摘要

A machine for cutting spaced grooves in a concrete road surface includes at least two laterally-spaced hydraulic cylinders (59) which apply downward operating forces on a travelling cutter head (36). Each cylinder is individually pressurized through a pressure line (60, 61) that incorporates a pressure reducing valve (68) and a pressure relief valve (69). The pressure setting for the relief valve (69) is slightly higher than the setting of the reducing valve (68), such that the cylinder pressure is closely maintained between a high limit established by the relief valve (69) and a low limit established by the reducing valve (68).