Category: Hydraulic Circuit

Hydraulic Presses Machines

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Hydraulic Presses Machines

Presses action are typically used for molding, shaping, shearing, and many other operations. To understand the hydraulic pressing calculation, let us set an example of a 30-in. bore and 10-in. stroke hydraulic press cylinder. The system needs to complete the operation in 30 s. The flow rate required to complete an individual press is 61 …

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Hydraulic Automatic Transmission Performance

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Hydraulic Automatic Transmission Performance

Six gears direct-drive transmission and three shifts automatic transmission/ torque converter performance is shown in figure above. In the figure we can see that three shift on torque converter have the power transfer bands as smooth as the power line produced with six shifts. However, the automatic transmission has higher power loss which is indicated …

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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 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 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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Cooling Hydraulic Oil

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Cooling Hydraulic Oil

Hydraulic oil is cooled by a heat exchanger, there are 2 type of hydraulic oil heat exchanger: shell-and-tube and finned tube. The shell-and-tube heat exchanger consists of series of tubes inside a closed cylinder. The hot hydraulic oil flows through these tubes with the cooling fluid flows around the tube to receive the heat. The …

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Bendix Hydro Boost Brake System

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Bendix Hydro Boost Brake System

Bendix hydro boost brake system was designed by Bendix Corporation to simplify the engine compartment. The figure above shows the Bendix hydro boost brake system schematic. The basic system consists of an open center spool valve and a hydraulic cylinder assembled in a single unit. The oil pressure is provided by power steering pump. Hydro-boost …

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Pressure Control Valves in Hydraulic Circuit

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Pressure control is the most important element in hydraulic circuit. Hydraulic components are designed to operate on a specific pressure range with capability to withstand some burst peak pressure. These components can be damaged if the working pressure exceeds its maximum pressure for a long period of time. The damage can injure nearby workers or …

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