Pumps and Compressors (turn rotary torque from an AC or DC electric motor into pressure in a hydraulic or pneumatic system) Fixed Displacement hydraulic pump symbols -unidirectional -bidirectional Variable displacement hydraulic pump symbols -unidirectional -bidirectional Compressor symbol Motors Fixed displacement hydraulic motor symbol -unidirectional -bidirectional Variable displacement hydraulic motor symbol -unidirectional -bidirectional Pneumatic motor symbol -unidirectional -bidirectional Rotary Actuator symbol - hydraulic - pneumatic Cylinders 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 retract) -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 pneumatic valve -directional control valve with 5 ports and 2 finite positions Directional control valve (5 ports / 3 positions) Normally a pneumatic valve -directional control valve with 5 ports and 3 finite positions Proportional directional control valve Electro-hydraulic servo valve -The spool positions on these valves is variable allowing for variable flow conditions. -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 Method Operator symbols for valves Manual Control -general symbol of a valves manual operator (without showing the control type) -pushbutton -lever -foot pedal Mechanical Valve Control -plunger or tracer -spring (used on one side of a valve to hold it in the normally open or normally closed state) -roller -roller (one direction only) Electrical/Solenoid Valve Control -Solenoid (the one sides winding shown) Pilot Operation (uses pressure to actuate valve) -pneumatic actuated pilot -hydraulic actuated pilot 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 Shuttle valve -to isolate one part of a system from an alternate part of circuit. Rapid exhaust valve/Pneumatic -installed close to an actuator for rapid movement of the actuator. Pressure Control Valves 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 Sequence Valve - 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 Valves Throttle valve -adjustable output flow Flow Control valves -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) -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 -Flow control valve with variable output and relief port to reservoir Flow dividing valve -flow is divided equally to two outputs. Shut-Off Valve -Shut-Off Valve Simplified symbol Accumulators -Accumulator symbol (Stores Pressure) Reservoir (Tank) -Reservoir symbol (Holds Fluid medium of your system) Filters, Water Traps, Lubricators and Miscellaneous Apparatus Filter or Strainer Water Trap -with manual drain -with automatic drained Filter with water trap -with manual drain -automatic drain Air Dryer refrigerant, or chemical removal of water from compressed air line Lubricator -oil vapor is injected into air line Conditioning unit (FRL, Pressure Regulator) -compound symbol of filter, regulator, lubricator unit(FRL symbol) -Simplified Symb
Posted on: Sat, 04 Oct 2014 18:03:45 +0000