5. Hydraulic System
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Transcript of 5. Hydraulic System
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T.C.KANISH, SMBS
Hydraulic system
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Pneumatic system
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Comparisons of hydraulic and pneumatic systems
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ISO symbols
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Pascal’s Law
Pressure in an enclosed fluid can be
considered uniform throughout a
practical system. There may be small
differences arising from head
pressures at different heights, but
these will generally be negligible
compared with the system operating pressure. This equality of pressure is
known as Pascal's law.
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Relationship between absoluteand gauge pressures
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Units of pressure
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Bourdon tube gauge construction
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Relationship between fow and pressure
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Hydraulic Pump
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Types of Pump
Hydrodynamic pumppositive displacement pump
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Gear pump
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Lobe pump
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ur!"er forms of #ear pump
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$a%e pump
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$a%e pump
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&ariable displaceme%! $a%epump
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'adial pis!o% pump
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A(ial pump )i!" s)as" pla!e
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FILTERS
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il!er
• il!ers are used !o pre$e%! dir! e%!eri%# !"e
par!s of !"e sys!em.
• *ir! i% !"e "ydraulic sys!em causes
s!ic+i%# $al$es. failure of seals a%d
prema!ure )ear
• $e% par!icle of dir! as small as -/ ca%
dama#e !"e sys!em
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il!er Posi!io%
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Types of il!er
Full flow filter Proportional flow filter
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Circula!i%# pump for il!er
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ir !ompressor
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Compo%e%!s
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Component parts o a pneumatic system
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Compressor types
• Single cylinder compressor
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• Double-acting compressor
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• Two-stage compressor
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• Dry screw rotary compressor
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Rotary compressors
• Vane compressor
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• Lobe compressor
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Non-positive displacementcompressors !lowers"
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Air receivers andcompressor control
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#hree stages o airtreatment
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!ircuit diagram and pneumatic elements
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Air il!er a%d )a!er !rap
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T.C.KANISH, SMBSRefrigerated dryer
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Deli$uescent dryer
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%dsorption dryer
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Accumula!or
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Lubrica!or
Th t
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Three types o pressureregulator
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Relief valves
N li i
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Non-relieving pressureregulator
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Relieving pressure regulator
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C"ec+ $al$e
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Chec& valve applications
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Restriction check valve
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Lo#ic $al$es
• 0' $al$e
• AN* $al$e
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0' &al$e 1S"u!!le $al$e2
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0' &al$e 1S"u!!le $al$e2
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AN* $al$e
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B A B AY .. +=
CBCABAY ++=
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C BC A B AY ... ++=
*i3ere%! !ypes of pressure
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*i3ere%! !ypes of pressureco%!rol $al$es
" pressure relief $al$e
" pressure se4ue%ce $al$e
" pressure limi!i%# $al$e
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Relief valves
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Sequence valve
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Pressure limi!i%# $al$e
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Proper!ies of Hydraulic 5uid
• lubrica!io%
• seala%!
• cooli%#
• $iscosi!y
• corrosio% pre$e%!io%
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Speed Co%!rol
• Speed co%!rol by pump $olume
• Me!er6i% speed co%!rol
• Me!er6ou! speed co%!rol
• Bleed6o3 speed co%!rol
Speed co%!rol by pump
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Speed co%!rol by pump$olume
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Me!er6i% circui!
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Me!er60u! circui!
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!leed-o' speed control
Speed control o (neumatic
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Speed control o (neumaticcylinder
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lo) co%!rol $al$es
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!ircuit diagram and pneumatic elements
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Accumula!ors
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accumula!or circui!
Lin&ed cylinders with
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Lin&ed cylinders withunbalanced load
i i i
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'e#e%era!io% circui!
C b l i i
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Counterbalance circuit
! &i hi h i i l d
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!ra&ing a high inertia load
(ilot-operated chec& valved h ld h li
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used to hold an over- haulingload
Cl d L !
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Closed Loop sys!em
