Hydraulic Symbols. Piping and Tubing Symbols Normal working line Flexible working line Pilot line Drain line Enclosure outline Direction of flow.
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Piping and Tubing Symbols
Normal working line
Flexible working line
Pilot line
Drain line
Enclosure outline
Direction of flow
Basic filter/strainer
Separator
Filter-separator
Manual Automatic
Fluid conditioning symbols are a diamond shape
Pumps
Fixed displacement
Unidirectional Bidirectional
Variable displacement, non-compensated, unidirectional
Variable displacement, non-compensated, bidirectional
Pumps
Variable displacement, pressure-compensated, unidirectional
Variable displacement, pressure-compensated, bidirectional
M Electric Motor Internal combustion
MotorsFixed displacement, unidirectional
Fixed displacement, bidirectional
Variable displacement, unidirectional
Variable displacement, bidirectional
Valves
Normally closed, two-way, two port
Normally closed, two-way, two position, two port
Normally closed, four way, three position, four port
Valves
Normally open, two-way, two position, two port
Normally open, two-way, three position, three port
Normally open, four way, three position, four port
Normally open, four way, infinite position, four port
Relief Valve
Represents the pilot line
Pressure Side
Valve normally closed
Spring loaded
Variable
When open, goes to tank
Valve is regulated by the feed pressure
Pressure Reducing Valve
Pressure Side
Represents the pilot line
Valve normally open
Spring loaded
Variable
Discharge side goes to line
Valve is regulated by the discharge pressure
Valves
Flow control with bypass, pressure compensated
Flow control with bypass, pressure and temperature compensated
Controls
Push Button
Lever
Pedal
Cam
Solenoid
Liquid pilot
Gas pilot
Servo
Pilot or solenoid
Pilot and solenoid activated, spring return
Cylinders
Single acting
Single acting, spring return
Double acting
Double acting, double rod
Double acting, single cushion
Double acting, Double cushion
Double acting, double adjustable cushion
Telescoping
Ram
Pressure intensifier
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