S0703010K
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Accumulator
GENERAL DESCRIPTION
The accumulator is a gas-charged storage
device designed to hold a reserve quantity of
hydraulic fluid under pressure. Accumulators are
used in hydraulic circuits in much the same way
that condensers (or capacitors) are used to
collect, store and maintain electrical charge in a
circuit.
In a hydraulic circuit, minor variations or lags in
pump output that might otherwise cause
unsteady or irregular operation are made up
from the supply of pressurized oil in the
accumulator.
Accumulators are solidly constructed to resist the high operating pressures of the fluids they contain. There
are only three main moving parts: a plug at the top allows pre-charging or expelling gas from the
compressible, pre-charged upper chamber; a valve assembly at the bottom of the accumulator for passing
hydraulic fluid in and out, and an elastic diaphragm to separate the two chambers. The flexible diaphragm
changes shape to conform to the changing pressures and volumes of the two fluids in the upper and lower
chambers.
There are six possible positions the diaphragm
can be in and they are as follows:
1.
With no gas charge in the upper chamber
0 bar (0 psi, empty) and no oil in the
bottom 0 bar (0 psi, dry) the elastic
diaphragm hangs loosely.
2.
When the pre-pressure charge of gas
(usually nitrogen) is introduced through the
port at the top of the accumulator, the
diaphragm expands to maximum size. The
valve button in the center of the diaphragm
pushes into the fluid opening in the bottom
chamber, sealing off the lower valve. If the
pressure of the gas charge exceeds
system oil pressure, no fluid enters the
accumulator. The button also keeps the
diaphragm from protruding into the lower
valve opening.
Reference
Number
Description
1
Screw Plug
2
Steel Pressure Vessel
3
Diaphragm
4
Fluid Valve
1
2
3
4
ARS1790L
Figure 1
1
2
3
6
5
4
Nitrogen
ARS1800L
Pressure Fluid
Figure 2
Summary of Contents for Solar 225LC-V
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Page 70: ...S0205015K Page 22 Specifications for Solar 225LC V Return to Master Table of Contents ...
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Page 99: ...1UPPER STRUCTURE ...
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Page 116: ...S0403050K Page 8 Counterweight Return to Master Table of Contents ...
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Page 165: ...1LOWER STRUCTURE AND CHASSIS ...
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Page 192: ...S0505030 Page 26 Track Assembly Return to Master Table of Contents ...
Page 193: ...1ENGINE AND DRIVE TRAIN ...
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Page 205: ...S0605060K Page 11 Air Conditioner Face and Defroster ARS1300L Figure 12 ...
Page 229: ...S0609000 Page 9 Drive Coupling Main Pump Figure 10 DRIVE COUPLING INSTALLATION UCHIDA PUMP ...
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Page 235: ...1HYDRAULICS ...
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Page 341: ...S0707200 Page 13 Swing Motor Return to Master Table of Contents SPECIAL TOOLS Figure 6 ...
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Page 452: ...S0708320 Page 40 Main Pump With Regulator Return to Master Table of Contents ...
Page 458: ...S0709401K Page 6 Main Control Valve Kayaba Figure 1 ...
Page 459: ...S0709401K Page 7 Main Control Valve Kayaba Figure 2 ...
Page 461: ...S0709401K Page 9 Main Control Valve Kayaba ...
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Page 475: ...S0709401K Page 23 Main Control Valve Kayaba Figure 16 ...
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