Home Symbol library Diagram symbols Hydraulics & pneumatics diagrams Hydraulics & pneumatics diagrams
Line symbols for hydraulic and pneumatic circuits: directional valves, cylinders, pumps and motors, pressure and flow valves, accumulators and air preparation. Not certified against any standard.
Schematic symbols are drawn from scratch following the usual conventions of ISA-5.1, ISO 10628 and IEC 60617. They are not certified against those standards: check them against your company standard before using them in issued documentation. Each symbol’s note says what could not be verified.
All 150 Directional valves: 2/2 and 3/2 20 Directional valves: 4 and 5 ports 30 Pressure control valves 10 Flow, check & logic valves 12 Cylinders 17 Pumps, motors & compressors 22 Tanks, accumulators & air preparation 19 Lines, couplings & instruments 20
150 of 150 symbols
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Directional valves: 2/2 and 3/2 20
2/2 valve, normally closed, lever with detent Schematic 2/2 valve, normally closed, pneumatic pilot, spring return Schematic 2/2 valve, normally closed, push button, spring return Schematic 2/2 valve, normally closed, solenoid, spring return Schematic 2/2 valve, normally open, push button, spring return Schematic 2/2 valve, normally open, solenoid, spring return Schematic Proportional 2/2 valve (continuous flow control) Schematic 3/2 valve, normally closed, hydraulic pilot, spring return Schematic 3/2 valve, normally closed, lever with detent Schematic 3/2 valve, normally closed, foot pedal, spring return Schematic 3/2 valve, normally closed, pneumatic pilot, spring return Schematic 3/2 valve, normally closed, plunger, spring return Schematic 3/2 valve, normally closed, push button, spring return Schematic 3/2 valve, normally closed, idle-return roller, spring return Schematic 3/2 valve, normally closed, roller, spring return Schematic 3/2 valve, normally closed, solenoid, spring return Schematic 3/2 valve, normally closed, solenoid with pilot stage, spring return Schematic 3/2 valve, normally open, pneumatic pilot, spring return Schematic 3/2 valve, normally open, push button, spring return Schematic 3/2 valve, normally open, solenoid, spring return Schematic Directional valves: 4 and 5 ports 30
3/3 valve, closed centre, double solenoid, spring centred Schematic 4/2 valve, double hydraulic pilot (bistable) Schematic 4/2 valve, double solenoid (bistable) Schematic 4/2 valve, hydraulic pilot, spring return Schematic 4/2 valve, lever with detent Schematic 4/2 valve, pneumatic pilot, spring return Schematic 4/2 valve, solenoid, spring return Schematic 4/2 valve, solenoid with pilot stage, spring return Schematic 4/3 valve, closed centre, double pilot, spring centred Schematic 4/3 valve, closed centre, double solenoid, spring centred Schematic 4/3 valve, float centre (A-B-T), double solenoid, spring centred Schematic 4/3 valve, open centre, double solenoid, spring centred Schematic Proportional directional valve 4/3, closed centre, double solenoid Schematic Servo valve 4/3 (torque motor and hydraulic pilot) Schematic 4/3 valve, tandem centre (P to T), double solenoid, spring centred Schematic 5/2 valve, double pneumatic pilot (bistable) Schematic 5/2 valve, double solenoid (bistable) Schematic 5/2 valve, double solenoid with pilot stage (bistable) Schematic 5/2 valve, hydraulic pilot, spring return Schematic 5/2 valve, lever with detent Schematic 5/2 valve, foot pedal, spring return Schematic 5/2 valve, pneumatic pilot, spring return Schematic 5/2 valve, push button, spring return Schematic 5/2 valve, roller, spring return Schematic 5/2 valve, solenoid, spring return Schematic 5/2 valve, solenoid with pilot stage, spring return Schematic 5/3 valve, closed centre, double solenoid, spring centred Schematic 5/3 valve, exhaust centre, double solenoid, spring centred Schematic 5/3 valve, pressure centre, double solenoid, spring centred Schematic Proportional directional valve 5/3, closed centre, double solenoid Schematic Pressure control valves 10
Counterbalance valve with check Schematic Pressure switch Schematic Pressure reducing valve, without relief Schematic Pressure reducing valve, with relief port Schematic Pressure relief valve Schematic Pilot-operated pressure relief valve Schematic Proportional pressure relief valve Schematic Pneumatic safety (relief) valve, exhaust to atmosphere Schematic Sequence valve Schematic Unloading valve (external pilot) Schematic Flow, check & logic valves 12
Check valve (no spring) Schematic Pilot-operated check valve (pilot to open) Schematic Spring-loaded check valve Schematic Dual-pressure valve (AND) Schematic Flow divider (two coupled motors) Schematic 2-way pressure-compensated flow control valve Schematic Quick exhaust valve Schematic Shut-off valve (manual) Schematic Shuttle valve (OR) Schematic Adjustable throttle valve Schematic One-way flow control valve (adjustable throttle with check) Schematic Fixed throttle Schematic Cylinders 17
Diaphragm cylinder, single-acting Schematic Diaphragm cylinder, single-acting, spring return Schematic Double-acting cylinder Schematic Double-acting cylinder, adjustable cushioning both ends Schematic Double-acting cylinder, adjustable cushioning on cap end Schematic Double-acting cylinder, fixed cushioning both ends Schematic Double-acting cylinder, fixed cushioning on rod end Schematic Double-acting cylinder, double-ended rod Schematic Pressure intensifier (booster) Schematic Double-acting cylinder with magnetic piston and sensor Schematic Rodless cylinder (external carriage) Schematic Single-acting cylinder, return by external force Schematic Ram cylinder (plunger), single-acting Schematic Single-acting cylinder, spring return Schematic Tandem cylinder Schematic Telescopic cylinder, double-acting Schematic Telescopic cylinder, single-acting Schematic Pumps, motors & compressors 22
Compressor, fixed displacement Schematic Compressor, variable displacement Schematic Electric drive motor Schematic Hydraulic motor, fixed displacement, two flow directions Schematic Hydraulic motor, variable displacement, two flow directions Schematic Hydraulic motor, fixed displacement, one flow direction Schematic Hydraulic motor, variable displacement, one flow direction Schematic Hydraulic semi-rotary actuator (limited angle) Schematic Pneumatic semi-rotary actuator (limited angle) Schematic Pneumatic motor, two directions of rotation Schematic Pneumatic motor, one direction of rotation Schematic Pneumatic motor, variable displacement Schematic Hydraulic power source (pressure) Schematic Pneumatic power source (compressed air) Schematic Hand pump (hydraulic) Schematic Hydraulic pump, fixed displacement, two flow directions Schematic Hydraulic pump, variable displacement, two flow directions Schematic Hydraulic pump, fixed displacement, one flow direction Schematic Hydraulic pump, variable displacement, one flow direction Schematic Hydraulic pump, variable displacement, pressure compensated Schematic Hydraulic pump/motor unit Schematic Vacuum pump Schematic Tanks, accumulators & air preparation 19
Gas-loaded accumulator (separator) Schematic Hydraulic accumulator (general symbol) Schematic Spring-loaded accumulator Schematic Air dryer Schematic Cooler Schematic Filter Schematic Filter with clogging indicator Schematic Filter with water separator and manual drain Schematic FRL air service unit (detailed symbol) Schematic FRL air service unit (simplified symbol) Schematic Heater Schematic Lubricator Schematic Compressed air receiver Schematic Pressurized reservoir (closed) Schematic Reservoir (simplified return symbol) Schematic Reservoir vented to atmosphere, line above fluid level Schematic Reservoir vented to atmosphere, return line below fluid level Schematic Temperature controller (heat exchanger) Schematic Water separator with manual drain Schematic Lines, couplings & instruments 20
Quick coupling, connected, without check valves Schematic +1 Quick coupling, connected, with check valves Schematic +1 Exhaust to atmosphere, no connection Schematic Exhaust with connection (threaded) Schematic Flow meter Schematic Line crossing (not connected) Schematic Line crossing (connected) Schematic Drain or bleed line (short dashes) Schematic Flexible line (hose) Schematic Line junction (connected) Schematic Pilot line (long dashes) Schematic Working line (pressure or return) Schematic Position sensor (proximity) Schematic Pressure gauge Schematic Silencer (muffler) Schematic Solenoid (valve coil) Schematic Pressure test point Schematic Thermometer Schematic
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