Hydraulic & Pneumatic Symbols

Basic symbols

Rectangle Usually valves

Restriction depending Restriction depending on the viscosity

Restriction independing Restriction independing on the viscosity

Spring Spring

Square Usually valves

Square on a corner Conditional unit

Square. Usually valves

Square.. Usually valves

Square... Usually valves

Control mechanisms

Electrical 1 winding Electrical control with one winding

Electrical 2 windings Electrical control with two windings, two directions

Electrical 2 windings. Electrical control with two windings, two dir, variable

Electrical with motor Electrical control with motor

Increase hydraulic Direct control by increase of pressure - hydraulic

Increase pneumatic Direct control by increase of pressure pneumatic

Manual Muscular control - general symbol

Manual - lever Muscular control - lever

Manual - pedal Muscular control - pedal

Manual - push button Muscular control - push button

Mechanical - plung/roller Mechanical control - plunger and roller

Mechanical - plunger Mechanical control - plunger

Mechanical - roller Mechanical control - roller

Mechanical - spring Mechanical control - spring

Pressure Direct control by pressure

Release pneumatic Direct control by release of pressure - pneumatic

Control Valves

Free Non-return - free

Loaded Non-return - loaded

Quick-exhaust Quick-exhaust valve

Shuttle Shuttle valve

Cylinders

Breake Cylinder with breake in one end

Breake. Cylinder with breakes in both ends

Breake.. Cylinder with variable breake in one end

Breake... Cylinder with variable breaks in both ends

Differential Differential cylinder

Double - double piston Double-acting cylinder - double-ended piston

Double - single piston Double-acting cylinder - single-ended piston

Single - return Single-acting cylinder with unspecified return

Single - spring return Single-acting cylinder with spring return

Directional control V

2/2 hydraulic/pneumatic 2/2 hydraulic or pneumatic control valve

2/2 manual 2/2 manual control valve

3/2 hydraulic/pneumatic 3/2 hydraulic or pneumatic control valve

4/2 elektromagnetic 4/2 control valve w. elektromagnetic pilot valve

5/2 pressure 5/2 control valve with pressure control in both directions

Directional One direction

Directional. One closed direction

Directional.. Two directions

Directional... Two directions

Directional..... Two directions and one closed connection

Directional...... Two directions with link

Directional....... One direction and two closed connections

Energy units

Hydraulic Hydraulic source

Pneumatic Pneumatic source

Pressure General symbol

Filters/seperators

Air dryer Air dryer

Filter Filter

Lubricator Lubricator

Seperator Seperator - manually drained

Seperator. Seperator - automatically drained

Seperator.. Filter with seperator - manually drained

Seperator... Filter with seperator - automatically drained

Flow Valves

Flow control Flow-control valve with constant flow

Flow control. Flow-control valve with constant flow, con. to tank

Flow control.. Flow-control valve with adjustable flow

Gate Gate-valve

Restrictor Restrictor valve - simplified symbol

Restrictor. Restrictor valve - manual adjusted

Restrictor.. Restrictor V. - mechanical control by roller, spring-loaded

Functional elements

Hydraulic flow Hydraulic flow

Pneumatic flow Pneumatic flow

Sloping Facility for variability or adjustability

Heat exchangers

Controller Temperature controller

Cooler Cooler

Heater Heater

Measuring instruments

Flow 1219 Flow meter ISO 1219

Flow 3511 Flow meter ISO 3511

Integrating 1219 Integrating flow meter ISO 1219

Integrating 3511 Integrating flow meterr ISO 3511

Manometre 3511 Manometre ISO 3511

Pressure 1219 Pressure gauge ISO 1219

Pressure 3511 Pressure gauge ISO 3511

Temperature 3511 Temperature ISO 3511

Thermometer 1219 Thermometer ISO 1219

Thermometer 3511 Thermometer ISO 3511

Motors

Constant, 1 direction Constant hydraulic motor with one direction of flow

Constant, 2 directions Constant hydraulic motor with two directions of flow

Oscillating hydraulic Oscillating hydraulic motor

Oscillating pneumatic Oscillating pneumatic motor

Pneumatic, 1 direction Pneumatic motor with one direction of flow

Pneumatic, 2 directions Pneumatic motor with two directions of flow

Variable, 1 direction Hydraulic variable motor with one direction of flow

Variable, 2 directions Hydraulic variable motor with two directions of flow

Pressure transformers

Intensifier Pneumatic intensifier

Intensifier. Pneumatic/hydraulic intensifier

Pressure Valves

Basic Valve normally closed in unactivated position

Basic. Valve normally open in unactivated position

Basic.. 2 in and 1 out.Valve normally closed in unactivated position

Differential Differential pressure valve

Pressure control Pressure control valve without relief

Pressure control. Remote pressure control valve without relief

Pressure reducing Pressure reducing valve

Sequence Sequence valve

Pump-motors

Constant Pump-motor w. 1 direction for pump and reverse for motor

Constant. Pump-motor w. 1 direction for pump and motor

Constant.. Pump-motor w. 2 directions for pump and motor

Variabel Pump-motor w. 1 direction for pump and reverse for motor

Variabel. Pump-motor w. 1 direction for pump and motor

Variabel.. Pump-motor w. 2 directions for pump and motor

Pumps

Compressor Airpump with constant displace

Constant, 1 direction Constant hydraulic pump with one direction of flow

Constant, 2 directions Constant hydraulic pump with two directions of flow

Variable, 1 direction Variable hydraulic pump with one direction of flow

Variable, 2 directions Variable hydraulic pump with two directions of flow

Reservoirs

Accumulator Accumulator

Pressure-tank Pressure-tank

Tank Tank with connection to the atmosphere

Version

Hydraulic & Pneumatic ISO 1219 Version 1.00.00. Date: 28.05.2001