Archive for January, 2010

Hydraulic Pump Mounts

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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 ratios are available. When an internal combustion engine is the prime mover, it is desirable …

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Hydraulic Vane Pump Efficiency

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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 and 1800 rpm is compared. Volumetric efficiency at 1200 rpm decreases from 97.3% at 500 …

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Hydraulic Servo Valves

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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 spools to give precise control. A typical device is shown on Figure 4.40. This consists …

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