4-002
HYDRAULIC SYSTEMS
Valves
DESCRIPTION
SYMBOL
Check valve
Manual shut off (On-Off)
Pressure relief
Flow control, adjustable
Valve symbols:
The basic valve symbol
one or more squares
with lines representing
flow paths and flow con-
ditions between ports.
Multiple squares indicate
a valve with as many dis-
tinct positions there are
squares providing various
flow path options for the
fluid.
The multiple square
moves to represent how
flow paths change when
the valving element is
shifted within the compo-
nent.
Valves with infinite posi-
tioning between certain
limits are symbolized
with lines parallel to the
squares.
Methods of Operation
DESCRIPTION
SYMBOL
Spring
Manual
Pressure compensated
Reversing motor
Pilot pressure:
Internal supply
Remote supply
Solenoid:
Single winding
Two windings operating
in opposite directions.
Pilot directional valve is
actuated by the solenoid.
Summary of Contents for SW880-1
Page 1: ...SW880 1 990 1 SHOP MANUAL 3498 6568A 0 ...
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Page 47: ...HYDRAULIC SYSTEMS ...
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Page 83: ...ELECTRICAL SYSTEM ...
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Page 125: ...VIBRATORY DRUM ...
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Page 171: ...BRAKE ...
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Page 179: ...WATER SPRAY SYSTEM ...
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Page 183: ...INSPECTION AND ADJUSTMENT ...
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