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Servo Valve Design
In a hydraulic system that required a precise control of flow or pressure an electrohydraulic servo valve would be used. Servo valves use a torque motor to position the valve and are very precise. These valves are typically used in systems that contain little to no contamination. The valves internally are so close in tolerance that any contaminant could severely damage the valve. HyPneu can be used to simulate the performance of an electrohydraulic servo valve using different sets of parameters. In this case, the only data required to simulate the servo valve is the data for the flapper and the spool valve. All dimensional parameters of the servo valve are not required to run a simulation with this type of circuit.
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Pressure Compensated Pump

As it can been seen in the schematic, the pressure compensated pump consist of a pumping mechanism, a swash plate, controls, orifices, and a relief valve controlling the pressure setting. This pump design can be directly translated into a HyPneu drawing. In order to actually evaluate this pump through computer simulation, a drive motor and variable loading situations must be added to the circuit.

 
Cylinder Cushioning

In addition to the HyPneu circuit and simulation results, the simulation considers both compressibility and the clearance flow between the spear and the cushion cavity. Note the transient response shown in the results. This is mainly the dynamic effect due to fluid compressibility in the cushioning chamber that actually occurs in the real life cushioning process.

 

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HyPneu is a product of BarDyne, Inc. of Stillwater, Oklahoma U.S.A.
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