Diamond
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-diamond - Fluid conditioner (filter, separator,
lubricator, heat exchanger)
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Miscellaneous Symbols
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-Spring
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-Flow Restriction
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Triangle
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-solid - Direction of Hydraulic Fluid Flow
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-open - Direction of Pnematic flow |
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Pumps and Compressors
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Fixed Displacement hydraulic pump
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-unidirectional
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-bidirectional
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Variable displacement hydraulic pump
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-unidirectional
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-bidirectional
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Compressor
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Motors
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Fixed displacement hydraulic motor
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-unidirectional
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-bidirectional
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Variable displacement hydraulic motor
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-unidirectional
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-bidirectional
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Pneumatic motor
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-unidirectional
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-bidirectional
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Rotary Actuator
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- hydraulic
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- pneumatic
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Cylinders
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Single acting cylinder
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-returned by external force
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-returned by spring or extended by spring force
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Double acting cylinders
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-single piston rod (fluid required to extend and
retract)
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-double ended piston rod
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Cylinders with cushions
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- single fixed cushon
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- double fixed cushion
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- single adjustable cushion
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- double adjustable cushion
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Directional Control Valves
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Directional control valve (2 ports / 2 positions)
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-Normally closed directional control valve with 2 ports and
2 finite positions.
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-Normally open directional control valve with 2 ports and 2
finite positions.
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Directional control valve (3 ports / 2 positions)
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-Normally closed directional control valve with 3 ports and
2 finite positions.
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-Normally open directional control valve with 3 ports and 2
finite positions.
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Directional control valve (4 ports / 2 positions)
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-directional control valve with 4 ports and 2 finite
postions
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Directional control valve (4 ports / 3 positions)
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-directional control valve with 4 ports and 3 finite
postions
*-(center position can have various flow paths)
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Directional control valve (5 ports / 2 positions) Normally a
pneumatic valve
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-directional control valve with 5 ports and 2 finite postions
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Directional control valve (5 ports / 3 positions) Normally a
pneumatic valve
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-directional control valve with 5 ports and 3 finite postions
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Proportional directional control valve
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Electro-hydraulic servo valve
-The spool positions on these valves is variable allowing for
variable flow conditions.
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-single-stage direct operation unit which
accepts an analog signal and provides a similar analog fluid power output
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-two-stage with mechnical feedback indirect pilot
operation unit which accepts an analog signal and provides a similar
analog fluid power output
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Control Methods
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Manual Control
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-general symbol (without showing the control
type)
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-pushbutton
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-lever
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-foot pedal
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Mechanical Control
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-plunger or tracer
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-spring
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-roller
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-roller(one direction only)
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Electrical Control
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-Solenoid (the one winding)
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Pilot Operation
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-pneumatic
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-hydraulic
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Pilot operated two-stage valve
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-Pneumatic: Sol first stage
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-Pneumatic: Air pilot second stage
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-Hydraulic: Sol first stage
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-Hydraulic: Hyd pilot second stage
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Check valves, Shuttle valves, Rapid Exhaust valves
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-check valve -free flow one direction, blocked
flow in other direction
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-pilot operated check valve, pilot to close
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-pilot operated check valve, pilot to open
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Shuttle valve
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-to isolate one part of a system from an
alternate part of circuit.
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Rapid exhaust valve/Pneumatic
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-installed close to an actuator for rapid
movement of the actuator.
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Pressure Control Valves
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Pressure Relief Valve(safety valve) normally closed
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- line pressure is limited to the setting of the
valve, secondary part is directed to tank.
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Proportional Pressure Relief
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- line pressure is limited to and proportional to
an electronic signal
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Sequence Valve
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- 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.
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Pressure Reducing valve
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- pressure downstream of valve is limited to the setting of the valve |
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Flow Control Valves
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Throttle valve
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-adjustable output flow
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Flow Control valve
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-with fixed output (variations in inlet pressure
do not affect rate of flow)
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-with fixed output and relief port to reservoir with
relief for excess flow (variations in inlet pressure do not affect rate of
flow)
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-with variable output
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-fixed orifice
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-metered flow toward right free flow to left
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-pressure compensated flow control fixed output flow regardless of load
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-pressure and temperature compensated
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-with variable output and relief port to reservoir
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Flow dividing valve
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-flow is divided equally to two outputs.
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Shut-Off Valve
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-Simplified symbol
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Accumulators
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Filters, Water Traps, Lubricators and Miscellaneous Apparatus
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Filter or Strainer
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Water Trap
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-with manual drain
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-with automatic drained
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Filter with water trap
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-with manual drain
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-automatic drain
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Air Dryer
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refrigerant, or chemical removal of water from compressed
air line
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Lubricator
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-oil vapor is indected into air line
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Conditioning unit
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-compound symbol of filter, regulator, lubricator
unit
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-Simplified Symbol
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Heat Exchangers
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| -air or water cooled unit designed to remove heat from oil returning to reservoir
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