Category: Hydraulic Equipments

Hydraulic Diaphragm Accumulators

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Hydraulic Diaphragm Accumulators

The hydraulic diaphragm accumulator consists of halves screwed or bolted together. A synthetic rubber diaphragm is installed between both halves, making two chambers. Two connection ports are threaded in both halves. The top opening is fitted with a screen disc to prevent the diaphragm from rupturing when system pressure is depleted. The air valve is …

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Hydraulic Piston Accumulator

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Hydraulic Piston Accumulator

Hydraulic piston accumulator consists of a barrel as body, heads and piston. The piston may be extended with a tail rod; the piston without a tail rod is referred to as a floating piston. Hydraulic fluid is pumped into one end of the cylinder and the piston is forced toward the opposite end of the …

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Hydraulic Bladder Accumulator

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Hydraulic Bladder Accumulator

A bladder accumulator is constructed by entering a flexible bladder inside a shell. The hydraulic bladder accumulator has a larger diameter at the top and smaller at the bottom. The bladder bag is made from synthetic rubber which is thinner at the top than at the bottom. The accumulator work on Barlow’s formula which states: …

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Rephasing of Hydraulic Cylinders

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Rephasing of Hydraulic Cylinders

When cylinders are connected in series, it is necessary to provide a feature for rephasing these cylinders when they are fully retracted. Otherwise, leakage will cause the downstream cylinder to not fully extend. An example of the need for rephasing is an agricultural implement (planter, cultivator, disk harrow, grain drill, etc.) that must be folded …

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Hydraulic Cylinder Cushioning

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Hydraulic Cylinder Cushioning

When cylinders reach the end of their stroke, the pressure rises quickly, creating a shock wave in the hydraulic circuit. Cushioning is done to reduce this stock. The concept, shown in Fig. 7.6, is quite simple. First, we consider the case in which the cylinder is retracting. The spear closes off the large opening where …

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Basic Concept of Hydraulic Cylinder

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Basic Concept of Hydraulic Cylinder

Suppose a flow of fluid is delivered to a hydraulic cylinder, causing it to extend. The cylinder has a cross-sectional area A and delivers a force F while moving a distance x (Fig. 1.2). The distance moved is related to the fluid volume delivered to the cylinder. x = V/A                    (1.5) where x = distance …

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