Hydraulic Vane Pump Volumetric Efficiency

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Hydraulic Vane Pump Volumetric Efficiency

Vickers Pump Model 25V-T is a hydraulic vane pump which has a 4.81 in3/rev displacement with max speed 1800 rpm and max pressure 2500 psi. The vane pump volumetric efficiency at 1200 rpm decreases from 97.3% at 500 psi to 84% at 2500 psi. While the hydraulic gerotor pump volumetric efficiency decreased from 91.5 to …

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Basic Hydraulic Servo Systems

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Basic Hydraulic Servo Systems

Four basic hydraulic servo systems: 1. Valve motor two servo actuator system or servo motor. 2. Valve cylinder two servo actuator system or servo cylinders. In two servo-actuator systems, the valve is mounted directly on the actuator to avoid the increases of natural frequency. 3. Servo pump-motor two servo pump systems. 4. Split servo pump-motor …

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Hydraulic Variable Displacement Pump

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Hydraulic Variable Displacement Pump

An expensive hydraulic variable displacement pump offers many options for hydraulic circuit design. The pump displacement can be changed using a servo valve to manipulate the actuator speed movement. The open loop hydraulic design as shown in figure above can be re-design in to a closed loop system by adding sensor on the gearbox output …

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Hydraulic Closed Center System

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Hydraulic Closed Center System

In closed center system the hydraulic pump can rest when the oil is not required to operate a function. This circuit uses a control valve which is closed in the center to stop the oil flow from the pump. The figure above shows a hydraulic closed-center system. On closed-center system, the quantity of oil to …

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Hydraulic Sliding Spool Valve

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Hydraulic Sliding Spool Valve

The figure above shows a hydraulic sliding-spool valve. The piston inside the valve slides back and forth to block and release ports in the housing. This valve sometimes called as a piston type spool valve, the sliding-spool valve has a piston of which the inner areas are equal. The hydraulic oil pressure from the inlet …

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Hydraulic Flow Control Valves

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Hydraulic Flow Control Valves

A hydraulic flow control valve is a device used for adjusting or manipulating the hydraulic oil flow rate. The hydraulic flow control valve constructs of a flow passage or a port whose flow area can be varied. Most common applications of flow control valves in hydraulic systems are in controlling the hydraulic oil flow rate …

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Hydraulic Regeneration Circuit

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Hydraulic Regeneration Circuit

A typical hydraulic cylinder have a larger extending force than retracting because of the area difference between full bore and annulus sides of the piston. Hydraulic regeneration system can be use to equalize the force. The example hydraulic regeneration circuit in figure above employs a differential cylinder with a full bore/annulus ratio of 2:1. During …

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