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Pneumatic Symbols For system diagrams and component identification.

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Presentation on theme: "Pneumatic Symbols For system diagrams and component identification."— Presentation transcript:

1 Pneumatic Symbols For system diagrams and component identification

2 Basic Symbols

3 Shapes These shapes and lines in the relative proportions shown, make up a set of basic symbols from which circuits are constructed

4 Basic Symbols Line Working line, pilot supply, return, electrical Chain Enclosure of two or more functions in one unit Dashed Pilot control, bleed, filter Line Electrical line

5 Functional Elements

6 Long sloping indicates adjustability Arrow 1/3 l size to suit Spring Triangle Direction and nature of fluid, open pneumatic or filled hydraulic 1/4 l 1/2 l

7 Functional Elements Straight or sloping path and flow direction, or motion Arrows Size to suit Restriction Tee Closed path or port

8 Functional Elements 90 o angle Seating rotary motion Curved arrows clockwise from right hand end Shaft rotation anti-clockwise from right hand end both

9 Functional Elements Indication or control size to suit Temperature Operator Opposed solenoid windings Prime mover M M Electric motor

10 Flowlines and Connections

11 Flowlines not connected Crossing Junction Single Hose usually connecting parts with relative movement Flexible line Junction Four way junction

12 Connections Continuous Air bleed Air exhaust No means of connection Temporary by probe With means of connection

13 Conditioners and Pressure Producing Plant

14 Plant Compressor and electric motor Air receiver Isolating valve Air inlet filter M

15 Actuators

16 Cylinders symbols can be any length over “l” The piston and rod can be shown in the retracted, extended or any intermediate position “l”

17 Single acting Single acting sprung instroked Single acting sprung outstroked

18 Double acting Double acting adjustable cushions Double acting through rod

19 Valve symbol structure

20 The function of a valve is given by a pair of numerals separated by a stroke, e.g. 3/2.. The first numeral indicates the number of main ports. These are inlets, outlets and exhausts but excludes signal ports and external pilot feeds. The second numeral indicates the number of states the valve can achieve.

21 Valve symbol structure A 3/2 valve therefore has 3 ports (normally these are inlet, outlet and exhaust) and 2 states (the normal state and the operated state) The boxes are two pictures of the same valve normaloperated

22 Valve symbol structure A valve symbol shows the pictures for each of the valve states joined end to end normaloperated

23 Valve symbol structure A valve symbol shows the pictures for each of the valve states joined end to end normaloperated

24 Valve symbol structure The port connections are shown to only one of the diagrams to indicate the prevailing state normal

25 Valve symbol structure The operator for a particular state is illustrated against that state Operated state produced by pushing a button

26 Valve symbol structure The operator for a particular state is illustrated against that state Operated state produced by pushing a button Normal state produced by a spring

27 Valve symbol structure The operator for a particular state is illustrated against that state Operated state produced by pushing a button Normal state produced by a spring

28 Valve symbol structure The valve symbol can be visualised as moving to align one state or another with the port connections

29 Valve symbol structure The valve symbol can be visualised as moving to align one state or another with the port connections

30 Valve symbol structure The valve symbol can be visualised as moving to align one state or another with the port connections

31 Valve symbol structure A 5/2 valve symbol is constructed in a similar way. A picture of the valve flow paths for each of the two states is shown by the two boxes. The 5 ports are normally an inlet, 2 outlets and 2 exhausts

32 Valve symbol structure The full symbol is then made by joining the two boxes and adding operators. The connections are shown against only the prevailing state

33 Valve symbol structure The full symbol is then made by joining the two boxes and adding operators. The connections are shown against only the prevailing state

34 Valve symbol structure The full symbol is then made by joining the two boxes and adding operators. The connections are shown against only the prevailing state

35 Valve symbol structure The boxes can be joined at either end but the operator must be drawn against the state that it produces. The boxes can also be flipped A variety of symbol patterns are possible normally closed normally open

36 Valve symbol structure The boxes can be joined at either end but the operator must be drawn against the state that it produces. The boxes can also be flipped A variety of symbol patterns can be produced Reverse connected

37 Valve functions

38 Function 3/2 Normal position Basic valves before operators are added Examples, push button operated with spring return Operated position Function 5/2

39 Operators

40 General manual Push button Pull button Push/pull button Lever Pedal Treadle Manual Rotary knob

41 Operators Mechanical Plunger Spring normally as a return Roller Uni-direction or one way trip Pressure Pilot pressure Differential pressure Detent in 3 positions

42 Operators Solenoid direct Solenoid pilot with manual override and integral pilot supply Solenoid pilot with manual override and external pilot supply Electrical When no integral or external pilot supply is shown it is assumed to be integral

43 Port markings

44 Port Markings Push Button 3/2 Valve Spring Return Push Button 5/2 Valve Spring Return


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