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Fluid Power Application Physical Properties

Fluid Power Application Physical Properties. Hydraulics & Pneumatics KMD 3133. Objectives. Understand; Function -hydraulic fluid. Term-fluid. Distinguish-liquid,gas. Define -weight, density and specific gravity. Objectives (cont…). Pressure, head, and force.

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Fluid Power Application Physical Properties

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  1. Fluid Power ApplicationPhysical Properties Hydraulics & Pneumatics KMD 3133 MSY

  2. Objectives Understand; • Function -hydraulic fluid. • Term-fluid. • Distinguish-liquid,gas. • Define -weight, density and specific gravity. MSY

  3. Objectives (cont…) • Pressure, head, and force. • Differentiate-gage pressure,absolute pressures. • Calculate-force,pressure. • Pascal’s law MSY

  4. INTRODUCTION HYDRAULICS FLUID • Characteristics -crucial effect, application, performance,life. • Efficient-clean, high-quality • Modern Hydraulic-complex,carefully • Special additives-desired characteristics. MSY

  5. Hydraulics Fluid Introduction (4)four primary functions; • Transmitting power. • Lubricating moving parts. • Seal clearances between mating parts. • Dissipate heat. MSY

  6. Transmitting power Pump & Turbine MSY

  7. Lubricating moving parts Engine MSY

  8. EFFICIENCY OF FLUID MSY

  9. Properties Ensure-practical,safety,cost • Good Lubricity • Ideal viscosity • Chemical & environmental stability • Compatibility with system materials • High degree of incompressibility • Fire resistance MSY

  10. Properties (cont…) • Good heat-transfer capability • Low density • Foam resistance • Non-toxicity • Low volatility • Inexpensive • Ready available MSY

  11. Properties • In reality - no ideal • Designers -closest to being ideal • Change periodically –viscosity & acidity increase MSY

  12. Quality indicator • Viscosity. • Water content. • Foreign particle contamination level. MSY

  13. Fluids – Liquids • Fluid-gases,liquids • Liquids – definite volume • Shape-container. MSY

  14. Fluids – Liquids • Incompressible • Change-small,ignored MSY

  15. Fluids – Gases • Gases –compressible. • Volume-vessel containing them. MSY

  16. Fluids – Gases • Volume-influence, pressure • Increase -volume to decrease. • Air-commonin, expensive and readily available. MSY

  17. Fluids – Gases Advantages; • Fire resistant • Not messy • Can be exhausted back into the atmosphere. MSY

  18. Disadvantages • Compressibility – not suitable for accurate positioning, rigid holding • Due to compressibility – tends to be sluggish. • Corrosive -O2 and H20 • Added to lubricant • Limited pressures -250 psi,explosion,compress create energy MSY

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