Archive for January, 2011

Hydraulic Combination Pumps

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Hydraulic Combination Pumps

Many hydraulic applications are similar to Figure 2.16, where a workpiece is held in place by a hydraulic ram. There are essentially two distinct requirements for this operation. As the cylinder extends or retracts a large volume of fluid is required at a low pressure (sufficient just to overcome friction). As the workpiece is gripped, …

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Rack and Pinion Rotary Actuator

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Rack and Pinion Rotary Actuator

referred to as limited rotation cylinders, of the single or multiple, bidirectional piston are used for turning, positioning, steering, opening and closing, swinging, or any other mechanical function involving restricted rotation. Figure 10-10 shows a typical rack-and-pinion double piston actuator. The actuator consists of a body and two reciprocating pistons with an integral rack for …

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Hydraulic Stratopower Pump

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Hydraulic Stratopower Pump

Another type of axial piston pump, sometimes referred to as an in-line pump, is commonly referred to as a Stratopower pump. This pump is available in either the fixed-displacement type or the variable-displacement type. Two major functions are performed by the internal parts of the fixed-displacement Stratopower pump. These functions are mechanical drive and fluid …

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Hydraulic Radial Piston Pumps

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Hydraulic Radial Piston Pumps

Figure 4-11 illustrates the operation of the radial piston pump. The pump consists of a pintle, which remains stationary and acts as a valve; a cylinder block, which revolves around the pintle and contains the cylinders in which the pistons operate; a rotor, which houses the reaction ring of hardened steel against which the piston …

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Hydraulic Hand Pump

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Hydraulic Hand Pump

There are two types of manually operated reciprocating pumps—the single-action and the double-action. The single- action pump provides flow during every other stroke, while the double-action provides flow during each stroke. Single-action pumps are frequently used in hydraulic jacks. A double-action hand pump is illustrated in figure 4-10. This type of pump is used in …

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Hydraulic Reciprocating Pump

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The term reciprocating is defined as back-and forth motion. In the reciprocating pump it is this back-and-forth motion of pistons inside of cylinders that provides the flow of fluid. Reciprocating pumps, like rotary pumps, operate on the positive principle—that is, each stroke delivers a definite volume of liquid to the system. The master cylinder of …

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Hydraulic Screw Pump

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Hydraulic Screw Pump

Screw pumps for power transmission systems are generally used only on submarines. Although low in efficiency and expensive, the screw pump is suitable for high pressures (3000 psi), and delivers fluid with little noise or pressure pulsation. Screw pumps are available in several different designs; however, they all operate in a similar manner. In a …

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Hydraulic Lobe Pump

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Hydraulic Lobe Pump

The lobe operation as pump uses the same principle of the external gear pump described previously. The lobes are considerably larger than gear teeth, but there are only two or three lobes on each rotor. A three-lobe pump is illustrated in figure 4-7. The two elements are rotated, one directly driven by the source of …

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