Appendix: Graphic Symbols for Fluid Power Diagrams
This page provides the Appendix containing graphic symbols for fluid power diagrams from the U.S. Navy's fluid power training course.
Other related chapters from the Navy's fluid power training course can be seen to the right.
Navy Fluid Power Training Course
Fluid Connectors
| Line, Working (Main) |
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| Line, Pilot (for Control) |
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| Line, Exhaust and Liquid Drain |
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| Flow, Direction of (Hydraulic) |
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| Line, Flexible |
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| Quick Disconnect, Without Checks (Connected) |
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| Quick Disconnect, Without Checks (Disconnected) |
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| Line, with Fixed Restriction |
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| Lines, Crossing |
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| Lines, Joining |
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Energy Storage & Fluid Storage
| Reservoir, Vented |
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| Reservoir, Pressurized |
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| Reservoir with Connecting Lines Above Fluid Level |
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| Accumulator |
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| Accumulator, Spring Loaded |
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| Accumulator, Gas Charged |
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| Accumulator, Weighted |
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| Energy Source, Hydraulic (Pump, Compressor, Accumulator, etc.) |
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Fluid Conditioners
| Filter-Strainer |
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| Cooler (inside triangles indicate heat dissipation) |
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| Cooler (outside tringles indicate cooling medium is liquid) |
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| Cooler (outside tringles indicate cooling medium is gaseous) |
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| Heater (inside triangles indicate heat introduction) |
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| Heater (outside tringles indicate heating medium is liquid) |
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| Heater (outside tringles indicate heating medium is gaseous) |
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| Dessicator (Chemical Dryer) |
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Linear Devices
| Cylinder (Hydraulic & Pneumatic), Single Acting |
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| Cylinder (Hydraulic & Pneumatic), Double Acting, Single End Rod |
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| Cylinder (Hydraulic & Pneumatic), Double Acting, Double End Rod |
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Actuators and Controls
| Spring |
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| Manual (general symbol without indicating specific type, i.e. foot, hand, leg, arm, etc.) |
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| Push Button |
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| Mechanical |
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| Detent |
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| Pressure Compensated |
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| Electrical Solenoid (Single Winding) |
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| Pilot Pressure, Remote Supply |
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| Pilot Pressure, Internal Supply |
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| Solenoid or Pilot, External Pilot Supply |
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| Internal Pilot, Supply and Exhaust |
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Rotary Devices
| Hydraulic Pump, Fixed Displacement, Unidirectional |
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| Hydraulic Pump, Fixed Displacement, Bidirectional |
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| Hydraulic Pump, Variable Displacement, Non Compensated, Unidirectional |
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| Hydraulic Pump, Variable Displacement, Non Compensated, Bidirectional |
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| Hydraulic Pump, Variable Displacement, Pressure Compensated, Unidirectional |
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| Hydraulic Pump, Variable Displacement, Pressure Compensated, Bidirectional |
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| Hydraulic Motor, Fixed Displacement |
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| Electric Motor |
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| Heat Engine (e.g. internal combustion engine) |
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Instruments & Accessories
Indicating & Recording
| Pressure |
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| Temperature |
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| Flow Rate Meter |
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Accessories
| Pressure Switch |
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Valves
Two Way Valves (2 Ported Valves)
| On-Off Valve (Manual Shut-Off) |
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| Check Valve |
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| Check Valve, Pilot Operated to Open |
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| Check Valve, Pilot Operated to Close |
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Pressure Control Valves
| Pressure Relief Valve |
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| Sequence Valve |
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Four Way Valves
| Servovalve, Variable Position (indicated by parallel lines) |
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| Two Position, Normal |
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| Two Position, Actuated |
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| Three Position, Normal |
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| Three Position, Actuated Left |
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| Three Position, Actuated Right |
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| Typical Flow Paths for Center Condition of Three Position Valves |
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Flow Control Valves
| Adjustable, Non Compensated (Flow Control in Each Direction) |
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| Adjustable, Temperature & Pressure Compensated |
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