In the conventional type of hydraulic valve block, hydraulic pressure can only be valued control, such as: pressure valve at a set pressure moving testimony, the flow through the valve to maintain the set flow direction through the valve to the flow direction on / off switch, so the system functions of these control valves are subject to some restrictions, as technology advances, continuously or proportionally change with the control valve input signal varies in many hydraulic systems required flow and hydraulic servo system although able to meet their requirements, and high precision, but for most of the industries, they are not required to have such a high-quality system, and hope that under the conditions of guaranteed control performance, while inexpensive, reliable, maintenance is simple, so the proportional control valve is in this context to develop.
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