Hydraulics and Pneumatics: Unit III: Hydraulic Circuits and Systems
review and summary
Hydraulic Circuits and Systems - Hydraulics and Pneumatics
An accumulator is basically a pressure storage reservoir in which a non- compressible hydraulic fluid is retained under pressure from an external source.
REVIEW AND SUMMARY • An accumulator is basically a pressure storage reservoir in which a non- compressible hydraulic fluid is retained under pressure from an external source. • Types of accumulators: The three basic types are: 1. Weight-loaded (or dead-weight) accumulators, 2. Spring-loaded accumulators, and 3. Gas-loaded accumulators. (i) Non-separator type, and (ii) Separator type. (a) Piston type, (b) Diaphragm type, and (c) Bladder type. • Applications of accumulators : The accumulator circuits are used as : (i) Leakage compensator, (ii) Auxiliary power source, (iii) Emergency power source, (iv) Hydraulic shock absorber, (v) Fluid make-up device, (vi) Holding device, and (vii) Lubricant dispenser. • In this chapter, the purpose, construction, and operation of various types of accumulators and accumulator circuits have been described in detail. • Pressure intensifier, also known as presser booster, is a device which converts a large-volume, low-pressure fluid supply into a proportionately small-volume, high- pressure fluid outlet. • Pressure intensifier finds its application at places where a liquid of very high pressure is to be developed from available low pressure. Typical applications include hydraulic presses, riveting machines, and spot-welders. • At the end of the chapter, the purpose, construction, and operation of the pressure intensifier and intensifier circuits have been presented. • Formulae Summary: 1. Sizing of accumulators : For weight-loaded type accumulators: Capacity = P × A × L For gas-loaded type accumulators: 2. For pressure intensifiers: Accumulators Weight-loaded type Spring-loaded type Gas-loaded type Non-separator accumulators Separator accumulators Piston-type Diaphragm type Bladder type Accumulator symbols Accumulator circuits Sizing of accumulators Capacity of accumulators Intensifiers Pressure boosters Intensifier ratio Intensifier circuits Air-over-oil intensifier circuits Intensifier symbols
KEY TERMS ONE SHOULD REMEMBER
Hydraulics and Pneumatics: Unit III: Hydraulic Circuits and Systems : Tag: : Hydraulic Circuits and Systems - Hydraulics and Pneumatics - review and summary
Hydraulics and Pneumatics: Unit III: Hydraulic Circuits and Systems
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Hydraulics and Pneumatics
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