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Hydraulic_Schematic
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Interpreting Hydraulic Schematics
Presented by: Greg Rae AVADAL INC.
Knowledge Management Systems
A. Power Unit
Power Unit Schematic
1. Reservoir
4. Accumulators
3. Main Pumps
2. Kidney Loop
1. Reservoir
Temperature
Transducer &
Gage
Cooling Water Control
Sensor
Level
Switches
Tank
Breather
(2)
Heater
Heat Exchanger
Lines
Lines
Lines
Lines
Shapes
Reservoir
Heat Exchangers
Heat Exchangers
2. Kidney Loop
Filters
Pump & Motor
Heat Exchanger
Relief Valve
Water Valves
Filters
Fixed Volume Pumps
Pressure Compensated Pumps
3. Main Pumps
Unloading Relief
Shown Energized
Fixed Volume Pumps
High Pressure Filter
Unloading Relief
Shown De-Energized
Main Pumps Unloading/Relief
When the solenoid on the unloading /
relief valve is energized, the vent port on
the relief is blocked and pressure can
build to 2,250 PSI.
When the solenoid is de-energized, the
vent port drains to tank unloading the
pump to tank at 0 PSI
Unloading/Relief Cutaway
4. Accumulators
Nitrogen Bottles
Piston Style
Accumulators
Dump Valve
Pressure
Transducers &
Gages
Accumulators
B. Actuators & Controls
Actuators & Controls Schematic1. Actuators
5. Proportional &
Servo 3. Directional
Valves
4. Flow Control6. Logic Valves
2. Pressure
Control
1. Actuators
Cylinders
Cylinders
Rotary Actuators
Motors
2. Pressure Controls
Sequence Valve
Counterbalance Valve
Pressure Reducing Valves
3. Directional Control Valves
Check Valves
Pilot Operated Check Valves
Direct Operated Spool Valve
Direct Operated Spool Valve
Pilot Operated Spool Valve
Valve Operators
4. Flow Control
Flow Control Valves
5. Proportional & Servo
Direct Operated Proportional Valve
Pilot Operated Proportional Valve
Servo Valve
6. Logic Valves
Logic Valves - Poppet Ratio
Logic Valves - Directional Control
Logic Valves - Check
Logic Valves - Pressure Control