| In a variety of machinery, working members are driven by hydraulic cylinders. Such hydraulic systems are used to control multiple functions, such as raising and lowering the member, tilting and rotating the member about an axis, and sliding the member fore and aft. Flow-control valves are used in these hydraulic systems to control rate of flow from one part of the system to another. A proportional-priority-pressure compensating type of flow-control valve is used to proportionally divide the pump flow between the branches of the circuit based on their requirement. The valve uses a pressure compensator for accurate flow rate control. The pressure compensator maintains a constant pressure drop across the main spool valve. The pressure compensator is an integral part of the flow-control valve. In this thesis, a model and stability analysis for the pressure compensator is presented. |
