Basic Schematic Symbols Chart(Hydraulic and Pneumatic circuit design) Reference for the schematic symbols used in fluid power schematics, hydraulic schematics, pneumatic schematics, diagrams, and circuits Fluid Power Knowledge Center(Educational Resource for hydraulics, pneumatics, and automation) hydraulic application examples, projects, systems Other fluid power informational links: View Example Hydraulic Circuit/Hydraulic Schematic ELECTRICAL Circuit Schematic Symbols :) FLUID POWER Schematics Symbols (PDF) this page Aventics Engineering Tools, Pneumatic Circuit Symbol DOWNLOADs (full download under chart symbols) Pressure Regulator Symbol(Hydraulic Pressure Reducing Valve) Pressure Regulator Symbol(Pneumatic FRL - Filter,Regulator,Lubricator) Connecting Pressure Lines (usually representing plastic tubing for pneumatic [air] lines with low pressures, metal piping for hydraulic [fluid] lines with high pressure) -continuous line (for) flow line

-dashed line (for) pilot, drain -envelope (for) long and short dashes around two or more component symbols. -large circle - pump, motor -small circle  - Measuring devices -semi-circle - rotary actuator -one square  - pressure control function -two or three adjacent squares  - directional control -diamond - Fluid conditioner (filter, separator,carrier air purifier price -solid - Direction of Hydraulic Fluid Flowclassic heater air purifier -open - Direction of Pneumatic flowair purifier singapore review price (turn rotary torque from an AC or DC electric motor into pressure in a hydraulic or pneumatic system) Fixed Displacement hydraulic pump symbols Variable displacement hydraulic pump symbols

Fixed displacement hydraulic motor symbol Variable displacement hydraulic motor symbol Single acting cylinder symbols -returned by external force -returned by spring or extended by spring force Double acting cylinder symbols -single piston rod (fluid required to extend and -double ended piston rod Cylinders with cushions symbols - single fixed cushion - double fixed cushion - single adjustable cushion - double adjustable cushion Directional Control Valve symbols Directional control valve (2 ports / 2 positions) -Normally closed directional control valve with 2 ports and 2 finite positions. -Normally open directional control valve with 2 ports and 2 finite positions. Directional control valve (3 ports / 2 positions) -Normally closed directional control valve with 3 ports and 2 finite positions. -Normally open directional control valve with 3 ports and 2 finite positions. Directional control valve (4 ports / 2 positions)

-directional control valve with 4 ports and 2 finite positions Directional control valve (4 ports / 3 positions) -directional control valve with 4 ports and 3 finite positions *-(center position can have various flow paths) Directional control valve (5 ports / 2 positions) Normally a -directional control valve with 5 ports and 2 finite positions Directional control valve (5 ports / 3 positions) Normally a -directional control valve with 5 ports and 3 finite positions Proportional directional control valve -The spool positions on these valves is variable allowing for -single-stage direct operation unit which accepts an analog signal and provides a similar analog fluid power output -two-stage with mechanical feedback indirect pilot operation unit which accepts an analog signal and provides a similar analog fluid power output Control MethodOperator symbols for valves -general symbol of a valve's manual operator (without showing the control

-spring (used on one side of a valve to hold it in the normally open or normally closed state) -roller (one direction only) -Solenoid (the one side's winding shown) Pilot Operation(uses pressure to actuate valve) Pilot operated two-stage valve(uses a second lesser force to actuate the pilot actuation of the valve) -Pneumatic: Solenoid first stage -Pneumatic: Air pilot second stage -Hydraulic: Solenoid first stage -Hydraulic: Hydaulic pilot second stage Check valves, Shuttle valves, Rapid Exhaust valves -check valve symbol-free flow one direction, blocked flow in other direction -pilot operated check valve symbol, pilot to close -pilot operated check valve symbol, pilot to open -to isolate one part of a system from an alternate part of circuit. -installed close to an actuator for rapid movement of the actuator. Pressure Relief Valve(safety valve) normally closed - line pressure is limited to the setting of the valve, secondary part is directed to tank.

Proportional Pressure Relief Valve - line pressure is limited to and proportional to an electronic signal - when the line pressure reaches the setting of the valve, valve opens permitting flow to the secondary port. The pilot must be externally drained to tank. Pressure Reducing valve (Hydraulic Pressure Regulator) - pressure downstream of valve is limited to the setting of the valve -Flow control valve with fixed output (variations in inlet pressure do not affect rate of flow) -Flow control valve with fixed output and relief port to reservoir with relief for excess flow (variations in inlet pressure do not affect rate of -Flow control valve with variable output -Flow control valve with fixed orifice -Flow control valve with metered flow toward right free flow to left -Flow control valve with pressure compensated flow control fixed output flow regardless of load -Flow control valve with pressure and temperature compensated