Archive for October, 2012

Multiple Hydraulic Pump Circuits

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Multiple Hydraulic Pump Circuits

The multiple hydraulic pump types install two or more pumps in the same housing and use a single shaft to drive. Each pump has its own outlet although in some application one inlet is provided. The pump shown in figure above drives the fluid to a hydraulic motor and cylinder actuator. When the electric solenoid …

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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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