ISO Hydraulic Control Functions Schematic Symbols

ISO Hydraulic Schematic Symbols
Hydraulic and Pneumatic Knowledge

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

Description ISO Schematic Symbol
Hydraulic Valve Normally Closed Hydraulic Valve Normally Closed
Hydraulic Valve Normally Open Hydraulic Valve Normally Open
Pressure Limiting Valve, Fixed Pressure Limiting Valve, Fixed
Pressure Limiting Valve, Variable Pressure Limiting Valve, Variable
Pilot Operated, External Drain Line Pilot Operated, External Drain Line
Pilot Operated, Internal Drain Pilot Operated, Internal Drain
Hydraulic Pressure Reduction Line Hydraulic Pressure Reduction Line
Pilot Controlled Opening Valve Pilot Controlled Opening Valve
Pilot Controlled Closing Valve Pilot Controlled Closing Valve
Hydraulic Pressure Switch Hydraulic Pressure Switch
Where:

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

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