ISO/ANSI Basic Symbols For Fluid Power Equipment And Systems

 

 

 

 

 

  

Note
Additional symbols are shown in Vickers Circuitool booklet available for a nominal charge. Ask for circuitool template kit 352.

Color Code For Fluid Power Schematic Drawings
Function Color
Intensified Pressure . . Black
Supply . . . . . . . . . . . . . . Red
Charging Pressure . . . Intermittent Red
Reduced Pressure . . . . Intermittent Red
Pilot Pressure . . . . . . . . Intermittent Red
Metered Flow . . . . . . . . Yellow
Exhaust . . . . . . . . . . . . . Blue
Intake . . . . . . . . . . . . . . . Green
Drain . . . . . . . . . . . . . . . Green
Inactive . . . . . . . . . . . . . Blank

Definition Of Functions
Function Definition
Intensified Pressure - Pressure in excess of supply pressure which is induced by a booster or intensifier.
Supply Pressure - Power-actuating fluid.
Charging Pressure - Pump-inlet pressure that is higher than atmospheric pressure.
Reduced Pressure - Auxiliary pressure which is lower than supply pressure.
Pilot Pressure - Control-actuating pressure.
Metered Flow - Fluid at controlled flow rate, other than pump delivery.
Exhaust - Return of power and control fluid to reservoir.
Intake -Sub-atmospheric pressure, usually on intake side of pump.
Drain - Return of leakage fluid to reservoir.
Inactive -Fluid which is within the circuit, but which does not serve a functional purpose during the phase being represented.