This type of valve has the function of pressure compensator which can be divided into series hydraulic circuits and parallel hydraulic circuits . This valve provides excellent energy savings and highly efficient circuits. The turning angle of the lever is in proportion to the flow passing through the valve regardless of the variation of the load and the fluctuation of the input flow. In addition the valve has stable flow rate (speed) control. Because the range adjustment is attached, it is possible to regulate the maximum flow at A and B ports. A safety valve is built-in. The valve is easy to install and use. By attaching a brake valve, counter-balance valve and other accessory devices, this valve can be used as a combined valve, which is multifunctional and compact. The shock at the changeover is very little and the force to turn the lever is small.