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Industry Standard Hydraulic Symbols

To enable engineers to communicate and understand the circuitry associated with hydraulic systems there is an International Standard for hydraulic symbols – ISO1219/1 2006

Circuit diagrams enable the reader to identify the valve type and function and in certain cases, their locations relating to other components.

The symbols do not identify component size or their actual position on the machine however the symbols do provide vital information relating to the configurations and flow path connections.

The circuit diagram is a vital tool throughout the life of a system and should be kept up to date at all times should any modifications or changes be made to the circuit.

The circuit diagram becomes a very important document when carrying out fault-finding procedures.

Flow Meter

Temperature Gauge

Piston Accumulator

Bladder Accumulator

Variable Throttling Valve with Check

Variable Throttling Valve Two Way

Variable Displacement Pump Two Flow Direction

Variable Displacement Pump One Flow Direction

Variable Displacement Motor Two Rotation Direction

Variable Displacement Motor One Rotation Direction

Telescopic Cylinder Single Acting

Telescopic Cylinder Double Acting

Spool Position Sensor On & Off Mechanical Micro Switch

Spool Position Sensor On & Off Inductive Proximity Sensor

Single Acting Cylinder Return Stroke via Spring

Single Acting Cylinder Return Stroke by External Force

Sequence Valve Pilot Operated

Sequence Valve Direct Operated

Rotating Shaft Two Direction

Rotating Shaft One Direction

Rotary Actuator

Reservoir Piping’s Under Level

Reservoir Piping’s above Level

Pressurized Reservoir

Pressure Relief Valve Pilot Operated

Pressure Relief Valve Direct Operated

Pressure Reducing Valve Pilot Operated

Pressure Reducing Valve Direct Operated

Pressure Switch

Pressure Gauge

Pilot Piping’s and Connections

Main Piping’s and Connections

Liquid Operated Cooler Heat Exchanger

Diaphragm Accumulator

Heat Exchange Heater

Heat Exchange Cooler

Hand Pump

Flexible Hose Piping’s and Connections

Fixed Displacement Pump Two Flow Direction

Fixed Displacement Pump One Flow Direction

Fixed Displacement Motor Two Rotation Direction

Fixed Displacement Motor One Rotation Direction

Filter

Fast Coupling

Engine Motor

Directional Control Valve Electro Hydraulic (Proportional)

Electric Motor

Drain Pipes and Connections

Double Acting Cylinder – Single Rod

Double Acting Cylinder – Double Rod

Directional Control Valve 4 Way 3 Position

Directional Control Valve 4 Way 2 Position

Directional Control Valve 3 Way 2 Position

Directional Control Valve 2 Way 2 Position

Cylinder with Fixed End Cushioning on One Side

Cylinder with Fixed End Cushioning on Both Sides

Cylinder with Adjustable Stroke End Cushioning on One Side

Cylinder with Adjustable Stroke End Cushioning on Both Sides

Cross Piping’s and Connection

Coupling with Check Valves

Counter Pressure Valve

Directional Control Valve Spring

Directional Control Valve Push-Button

Directional Control Valve Pneumatic

Directional Control Valve Lever

Directional Control Valve Hydraulic

Directional Control Valve Electro-Hydraulic

Directional Control Valve Electric (Solenoid)

Directional Control Valve Electric (Proportional)

Directional Control Valve Detent

Directional Control Valve Cam

Directional Control Valve Adjustable Stroke Limiter

Connection Point Piping’s and Connections

Two Way Compensated Flow Regulator

Three Way Compensated Flow Regulator

Check Valve Spring Normally Closed

Check Valves Without Spring

Check Valves Pilot Operated

Check Valves Pilot Operated with Drain

Branching with Connected Piping

Branching Close