Category Archives for Creation and Control of Fluid Flow

Hydraulic Pump Mounts

Pump mounts are gearboxes that are designed to power hydraulic pumps. These gearboxes have one input and provisions for mounting one to four pumps on the output side (Fig. 4.30). Mounts are available with or without clutches, and different gear … Continue reading

26. January 2010 by Jack
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Multiple Hydraulic Pump Circuits

The multiple pump design places two or more pumps in the same housing and drives them with a single input shaft. Sometimes, only one inlet is provided, but each pump has its own outlet. The advantage of a multiple pump … Continue reading

26. January 2010 by Jack
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Hydraulic Vane Pump Efficiency

The Vickers Model 25V (T) vane pump has a displacement (cam ring fixed for maximum displacement) of 4.81 in3/rev. The specifications are: Maximum speed 1800 rpm Maximum pressure 2500 psi As was done with the gerotor pump, performance at 1200 … Continue reading

25. January 2010 by Jack
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Hydraulic Servo Valves

Servo valves are a close relative of the proportional valve and are based on an electrical torque motor which produces a small deflection proportional to the electrical current through its coil. They commonly use feedback between the main and pilot … Continue reading

06. January 2010 by Jack
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Hydraulic Gerotor Pump Performance

The Hydreco Model 1919 gerotor pump has a displacement of 4.53 in3/rev. The manufacturer gives performance data up to a maximum speed of 3000 rpm. The maximum pressure curve is 2500 psi. When driven at 1200 rpm, the volumetric efficiency … Continue reading

26. December 2009 by Jack
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Load Sensing Efficiency Improvement

Load sensing was developed to improve the efficiency of a circuit. It requires a variable displacement pump; thus, it is appropriate to discuss it here. An example will illustrate the advantage provided by load sensing. An application requires a maximum … Continue reading

26. December 2009 by Jack
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Hydraulic Radial Piston Pump

The principle of operation of the radial piston pump is shown in Fig. 4.16. In this case, the cylinders are positioned radially around the axis of rotation. As the shaft rotates, the connecting rods push the pistons back and forth … Continue reading

26. December 2009 by Jack
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Hydraulic Axial Piston Pump

The axial piston pump has a series of cylinders (typically 7 or 9) mounted parallel to the axis of rotation. (The arrangement is similar to shell chambers in a revolver.) Pistons are installed in the cylinders. Each piston has a … Continue reading

26. December 2009 by Jack
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Hydraulic Vane Pump Basic Operation

A vane pump (Fig. 4.7) has a series of vanes that slide back and forth in slots. There are springs in these slots that push the vanes out until the tip contacts the cam ring. (Some designs port pressurized fluid … Continue reading

25. December 2009 by Jack
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Variable Displacement Pump Hydraulic Circuits

Variable displacement pump circuits are called demand flow circuits. A simple example is shown in Fig. 4.6. (The astute reader will quickly observe that this circuit is the first circuit we have studied with no relief valve. Although no relief … Continue reading

25. December 2009 by Jack
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