Fluid%20Power%20Symbols

1
Fluid Power Symbols
2
Hydraulic Lines
1
Working Hydraulic Line
Pilot Line
Drain Line
Flexible Line
Lines Joining
Lines Passing
Flow Direction, Hydraulic
Line To Tank (Above Fluid Level)
Line To Tank (Below Fluid Level)
3
Pumps
2
Plug or Plugged Connection
Fixed Restriction (Fixed Orifice)
Fixed Displacement, Unidirectional, Hydraulic
Pump
Fixed Displacement, Bi-Directional,
Hydraulic Pump
Variable Displacement, Non-Compensating,
Unidirectional, Hydraulic Pump
4
3
Variable Displacement, Non-Compensating,
Bi-Directional, Hydraulic Pump
Variable Displacement, Pressure Compensated,
Unidirectional, Hydraulic Pump
Variable Displacement, Pressure Compensated,
Bi-directional, Hydraulic Pump
Motors and Cylinders
Fixed Displacement, Unidirectional, Rotary
Hydraulic Motor
5
4
Fixed Displacement, Bi-Directional,
Rotary Hydraulic Motor
Variable Displacement, Unidirectional,
Rotary Hydraulic Motor
Variable Displacement, Bi-Directional,
Rotary Hydraulic Motor
Limited Rotation Hydraulic Motor
Single Acting Cylinder
Double Acting Cylinder
6
Basic Valves
5
Double End Rod Cylinder
Check Valve
Check Valve, Pilot Operated To Close
Check Valve, Pilot Operated To Open
Manual Shut off Valve
Single Flow Path Valve, Normally Not Passing
Single Flow Path Valve, Normally Passing
7
Basic Valves II
6
Pressure Relief Valve
Two Position, Multiple Flow Path Valve(Arrows
Indicate Flow Direction)
Open Center, Three Position, Directional Control
Valve
Closed Center, Three Position, Directional
Control Valve
Tandem Center, Three Position, Directional
Control Valve
Float Center Three Position, Directional Control
Valve
8
7
Unloading Valve, Internally Drained, Remotely
Operated
Adjustable Non-Compensated Flow Control Valve
Deceleration Valve, Normally Passing
Sequence Valve, Directly Operated, Externally
Drained
Pressure Reducing Valve
9
8
Pressure Reducing and Relieving Valve
Counter Balance Valve with Check Valve
Temperature and Pressure Compensated Flow Control
Valve with Check Valve
Pressure Compensator
10
9
Detent
Manual
Mechanical
Pedal or Treadle
Push Button
Lever
Pilot Pressure
Solenoid
Spring
11
10
Solenoid Controlled, Pilot Pressure Operated
Servo
Miscellaneous Hydraulic Symbols
Pressure Gage
Temperature Gage
Flow Meter
M
Electric Motor
Heat Engine (E.G. Internal Combustion Engine)
Hydraulic Nozzle
12
11
Accumulator, Spring Loaded
Accumulator, Gas Charged
Accumulator, Weight Loaded
Filter or Strainer
Separator with Manual Drain
Separator with Automatic Drain
Filter Separator with Manual Drain
Filter Separator with Automatic Drain
13
12
Dessicator (Chemical Dryer)
Heater
Cooler
Temperature Controller
Intensifier
Pressure Switch
Lubricator Without a Drain
Lubricator With a Drain
Pneumatic Symbols
Flow Direction Pneumatic
14
13
Unidirectional Pneumatic Motor
Bi-Directional Pneumatic Motor
Pneumatic Compressor, Fixed Displacement
Pneumatic Nozzle
Muffler
Venturi