ISO Hydraulic Control Functions Schematic Symbols

ISO Hydraulic Schematic Symbols
Hydraulic and Pneumatic Knowledge

Fluid Power Equipment

The following are ISO hydraulic copntrol functions symbols commonly used on technical schematics.

Description ISO Schematic Symbol
Hydraulic Valve Normally Closed

Hydraulic Valve Normally Open

Pressure Limiting Valve, Fixed

Pressure Limiting Valve, Variable

Pilot Operated, External Drain Line

Pilot Operated, Internal Drain

Hydraulic Pressure Reduction Line

Pilot Controlled Opening Valve

Pilot Controlled Closing Valve

Hydraulic Pressure Switch


A = Working Line
B = Working Line
Z = Pilot Line
L = Drain Line

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