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 | ![]() |
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Hydraulic Valve Normally Open | ![]() |
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Pressure Limiting Valve, Fixed | ![]() |
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Pressure Limiting Valve, Variable | ![]() |
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Pilot Operated, External Drain Line | ![]() |
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Pilot Operated, Internal Drain | ![]() |
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Hydraulic Pressure Reduction Line | ![]() |
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Pilot Controlled Opening Valve | ![]() |
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Pilot Controlled Closing Valve | ![]() |
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Hydraulic Pressure Switch | ![]() |
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Where:
A = Working Line |