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