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• little khansa

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Basic Hydraulic Systems • • • • • • •

Hydraulic Tank Hydraulic Fluids Hydraulic Pumps and Motors Pressure Control Valves Directional Control Valves Flow Control Valves Cylinders

VALVE BODY

SPOOL GROOVE VALVE BORE

SPOOL LANDS

FROM CYLINDER HEAD END

FROM PUMP

FROM CYLINDER ROD END

VALVE SPOOL

VALVE BODY

LOAD CHECK VALVE

TO TANK TO TANK

TO TANK

FROM CYLINDER HEAD END

FROM PUMP

FROM CYLINDER ROD END

VALVE SPOOL

VALVE BODY

LOAD CHECK VALVE

TO TANK TO TANK

TO TANK

FROM CYLINDER HEAD END

FROM PUMP

FROM CYLINDER ROD END

VALVE SPOOL

VALVE BODY

LOAD CHECK VALVE

TO TANK TO TANK

TO TANK

ONE POSITION

TWO POSITION

THREE POSITION

TWO-WAY

THREE-WAY

FOUR-WAY

SIX-WAY

FLOW IN ONE DIRECTION

FLOW IN EITHER DIRECTION

PARALLEL FLOW

CROSS FLOW

FLOW BLOCKED

A B

CLOSED CENTER P T

TANDEM CENTER (CATERPILLAR OPEN CENTER)

A B

P T

A B

OPEN CENTER P T

TO TANK

LOWER

CHECK VALVE

TO CYLINDER ROD END TO CYLINDER HEAD END TO TANK

FROM PUMP

RAISE MANUAL CONTROL

PILOT OIL

TO TANK

LOWER

CHECK VALVE

TO CYLINDER ROD END TO CYLINDER HEAD END TO TANK

FROM PUMP

RAISE PILOT CONTROL

PILOT OIL

SOLENOID ACTUATOR

SPRING ACTUATOR

MANUAL ACTUATOR

PUSHBUTTON ACTUATOR

PUSH-PULL LEVER ACTUATOR

AIR ACTUATOR

MECHANICAL ACTUATOR

DETENTED ACTUATOR

PEDAL ACTUATOR

OIL ACTUATOR

ROD END

TO TANK PORT

PORT

TO TANK PORT

PORT

VALVE BODY

CHANNELS

VALVE BODY

ROD END

CHANNELS

PLUG

PLUG PORT PORT

FROM PUMP

PORT HEAD END

FROM PUMP

PORT

HEAD END

TO IMPLEMENT

FROM PUMP

FROM IMPLEMENT

TO PUMP

PILOT VALVE OIL CHAMBER

PILOT VALVE

ROD

TO CYLINDER

PILOT OIL

CHECK VALVE

FROM CONTROL VALVE

PILOT VALVE OIL CHAMBER

PILOT VALVE

ROD

FROM CYLINDER

PILOT OIL

TO CONTROL VALVE

CHECK VALVE

PILOT VALVE OIL CHAMBER

PILOT VALVE

ROD

FROM CYLINDER

PILOT OIL

TO CONTROL VALVE

CHECK VALVE

A

B

CHECK VALVE (OPEN)

CHECK VALVE (CLOSED) PILOT

CIRCUIT 1

CIRCUIT 2 C

D

CIRCUIT 3 SHUTTLE VALVE (RESOLVER VALVE)

PILOT OPERATED CHECK VALVE

TO CYLINDERS

FROM CYLINDER TANK OIL

TANK OIL

ELECTRO-MAGNETIC FIELD COVER

MANUAL OVERRIDE

PUSH PIN COIL

ARMATURE

TUBE

PUSH PIN

HYDRAULIC FLUID

MANUAL OVERRIDE FRAME

COIL

ARMATURE

A

B

P T

T

A

P

B

SOLENOID CONTROLLED PILOT VALVE

SOLENOID

A

SOLENOID

B

P T

T

A

P

B

A

B

P

T

A B

P T