Category: Hydraulic Circuit Design

Hydraulic Systems Advantages

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A hydraulic system has four major advantages, which makes it quite efficient in transmitting power. 1. Ease and accuracy of control: By the use of simple levers and push buttons, the operator of a hydraulic system can easily start, stop, speed up and slow down. 2. Multiplication of force: A fluid power system (without using …

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Hydraulic Systems Components

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Hydraulic Systems Components

Virtually, all-hydraulic circuits are essentially the same regardless of the application. There are six basic components required for setting up a hydraulic system: 1. A reservoir to hold the liquid (usually hydraulic oil) 2. A pump to force the liquid through the system 3. An electric motor or other power source to drive the pump …

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Hydraulic Regeneration Circuit

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Hydraulic Regeneration Circuit

A conventional cylinder can exert a larger force extending than retracting because of the area difference between full bore and annulus sides of the piston. The system in Figure 5.41 employs a cylinder with a full bore/annulus ratio of 2:1, and is known as a differential cylinder. Upon cylinder extension, line pressure P is applied …

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Hydraulic Diaphragm Accumulators

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Hydraulic Diaphragm Accumulators

The diaphragm-type accumulator is constructed in two halves which are either screwed or bolted together. A synthetic rubber diaphragm is installed between both halves, making two chambers. Two threaded openings exist in the assembled component. The opening at the top, as shown in figure 9-9, contains a screen disc which prevents the diaphragm from extruding …

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Hydraulic Bladder Accumulator

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Hydraulic Bladder Accumulator

Bladder- or bag-type accumulators consist of a shell or case with a flexible bladder inside the shell. See figure 9-7. The bladder is larger in diameter at the top (near the air valve) and gradually tapers to a smaller diameter at the bottom. The synthetic rubber is thinner at the top of the bladder than …

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Hydraulic Piston Accumulators

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Hydraulic Piston Accumulators

Piston-type accumulators consist of a cylindrical body called a barrel, closures on each end called heads, and an internal piston. The piston may be fitted with a tailrod, which extends through one end of the cylinder (fig. 9-5), or it may not have a tailrod at all (fig. 9-6). In the latter case, it is …

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Portable Hydraulic-Circuit Testers

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Portable Hydraulic-Circuit Testers

Hydraulic power is an efficient method of delivering HP by pumping a fluid through a closed system. If the amount of flow or the pressure unknowingly decreases, the amount of HP delivered to a working unit will be reduced, and a system will not perform as it should. Testers. Portable hydraulic-circuit testers (Figure 2-20) are …

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Hydraulic Closed-Center System

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Hydraulic Closed-Center System

In this system, a pump can rest when the oil is not required to operate a function. This means that a control valve is closed in the center, stopping the flow of the oil from the pump. Figure 2-7, shows a closed-center system. To operate several functions simultaneously, a closed-center system have the following connections: …

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Hydraulic Open-Center System

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Hydraulic Open-Center System

In this system, a control-valve spool must be open in the center to allow pump flow to pass through the valve and return to the reservoir. Figure 2-3, shows this system in the neutral position. To operate several functions simultaneously, an open-center system must have the correct connections, which are discussed below. An open-center system …

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Mechanical Hydraulic Servo Circuit

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Mechanical Hydraulic Servo Circuit

Figure 10.10 shows a mechanical hydraulic servo system with automotive power steering, the sequential operation of which occurs as follows: • The input or command signal is the turning of the steering wheel. • This results in movement of the valve sleeve, which ports oil to the actuator (steering cylinder). • The piston rod moves …

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