Hydraulic Symbols Piping and Tubing Symbols Normal working

Hydraulic Symbols

Piping and Tubing Symbols Normal working line Flexible working line Pilot line Drain line Enclosure outline Direction of flow

Crossing lines Joining lines

Reservoirs Open Sealed Reservoir Connecting lines above fluid level Connecting lines below fluid level

Basic filter/strainer Separator Manual Automatic Filter-separator Fluid conditioning symbols are a diamond shape

Cooler Liquid Gaseous Heater Temperature controlled

Pressure Temperature Flow meter, rate Float switch Flow meter, totalizing Nozzle Pressure Switch

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

Motors Fixed 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 Normallyopen, fourway, infinite three position, four port

Relief Valve Spring loaded Valve normally closed Variable Pressure Side Valve is regulated by the feed pressure When open, goes to tank Represents the pilot line

Pressure Reducing Valve Spring loaded Variable Pressure Side Discharge side goes to line Represents the pilot line Valve normally open Valve is regulated by the discharge pressure

Valves Relief Valve Sequencing Valve Pressure Reducing/Regulating Valve

Valves Orifice V Timing logic Check valve

Valves Flow control with bypass, pressure compensated Flow control with bypass, pressure and temperature compensated

Valves Counterbalance Valve Unloading Valve

Controls Push Button Liquid pilot Lever Gas pilot Pedal Servo Cam Pilot or solenoid Solenoid Pilot and solenoid activated, spring return

Cylinders Single acting Double acting Single acting, spring return Double acting, double rod Double acting, single cushion Double acting, Double cushion Double acting, double adjustable cushion Telescoping Ram Pressure intensifier