Category: Hydraulic Control System

Flow Trough Orifice

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Flow Trough Orifice

Orifices are a basic means for the control of fluid power. Flow characteristics of orifices plays a major role in the design of many hydraulic control devices. An orifice is a sudden restriction of short length (ideally zero length for a sharp-edged orifice) in a flow passage and may have a fixed or variable area. […]

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Disadvantages of Hydraulic Control

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Although hydraulic controls ofl’er many distinct advantages, several disadvantages tend to limit their use. Major disadvantages are thie following: 1. Hydraulic power is not so readily available as that of electrical powe:r This is not a serious threat to mobile and airborne applications but moist certainly afi’ects stationary applications. 2. Small allowable tolerances results in […]

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Advantages of Hydraulic Control

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There are many unique features of hydraulic control compared to other types of control. These are fundamental and account for the wide use of hydraulic control. Some of the advantages are the following: 1. Heat generated by internal losses is a basic limitation of any machine. Lubricants deteriorate, mechanical parts seize, and insulation breaks down […]

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Hydraulic Valve Characteristic

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Hydraulic Valve Characteristic

Proportional valves provide control of fluid power by a combination of variable-area orifices or in some cases by a combination of both fixed and variable orifices. By varying the area of the orifices, the desired relationship of flow and pressure drop through the orifices may be accomplished. The following equation gives this relationship: where Q […]

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