1. Pneumatic Symbols
For system diagrams and component
identification

2. Contents
z Standards z Actuators
z Basic symbols V l b l t t
z Functional elements
z Flowlines
z Valve symbol structure
z Valve functions
z Three position valves
z Connections
z Conditioners and plant
z Pressure regulators
z Operators
z Port marking
z Function z Relief valves
components
z Symbol Library
Click the section to advance directly to it

3. Graphic Symbols Standards
z Pneumatic symbols conform to and are devised
from the International Standard ISO 1219-1 1991
z This covers graphical symbols for Fluid Power
Systems and Components
z Port markings for fluid power valves are not
covered by the ISO standard. These are taken
from the recommendations of CETOP RP 68 P

4. CETOP
z Who is CETOP? CETOP is the abbreviation of Comité Européen des
Transmissions Oléohydrauliques et Pneumatiques. CETOP is the
European Fluid Power Committee.
Thus, it is:
z · The communication platform for fluid power in Europe.
· The international umbrella organisation for national fluid power
associations in Europe.
z Through the 18 national associations which are member of CETOP, all
well known companies in Europe belong to the European Committee.
Many of these companies are leading fluid power manufacturers and
major players in the international markets.
z CETOP represents more than 1,000 companies - mainly manufacturers,
but also some dealers - with almost 70,000 employees and a market value
of about 13 billion EURO. These account for a very high proportion of
companies active in these fields - 80-90% in most countries.

5. Basic Symbols

6. Shapes
z These shapes and lines in the relative
proportions shown, make up a set of basic
symbols from which fluid power symbols and
circuits are constructed

7. Basic Symbols (shapes)
z Symbol sets can be drawn to any size but their
scale and relative proportions are determined by
a basic dimension of your choice “l”
Circles l energy conversion units
3/4 l measuring instrument
1/3 l mechanical link
1/3 l roller

8. Basic Symbols (shapes)
l
Square control component
connections
perpendicular to sides
Square at
45o
conditioning apparatus
connections to corners
l
45
> l
Rectangle l cylinders and valves

9. Basic Symbols (shapes)
1/4 l
Rectangles
continued
l piston
1/4 l
cushion
min 1 l
1/2 l
certain control
methods, length
between 1/2 l
limits to
suit
max 2 l
1/2 l

10. Basic Symbols
l
Semi circle
actuator rotary actuator, motor
or pump with limited
angle of rotation
Semi-Capsule pressurised reservoir
air receiver, auxiliary
gas b ttl
bottle
2 l
l
Double line
mechanical connection
piston rod, lever, shaft
1/5 l

11. Basic Symbols
2
12 10
Line Working line, pilot supply,
return, electrical 3 1
Dashed Pilot control, bleed, filter
Chain Enclosure of two or more
functions in one unit
Line Electrical line

12. Functional Elements

13. Functional Elements
1/2 l 1/4 l
Triangle Direction and nature of fluid,
open pneumatic or filled
hydraulic
Spring size to suit
Arrow Long sloping indicates 1/3 l
g p g
adjustability

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

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

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

17. Flowlines and Connections

18. Flowlines
Junction Single
Junction Four way junction
Crossing not connected
Fl ibl Hose usually connecting
parts with relative movement
Flexible
line

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

20. Connections
Coupling quick Both to exhaust
release
Coupling quick
release Source sealed
self sealing
Coupling quick Both sealed
release self sealing

21. Connections
Rotary connection one
line
Rotary connection two
lines
Rotary connection
three lines

22. Conditioners and Pressure
Producing Plant

23. Conditioners
z Water separator with
manual drain
z Water separator with
automatic drain
z Filter with manual drain
z Filter with automatic drain
z Lubricator

24. Conditioners
z Dryer
z Cooler with and without
coolant flow lines
z Heater
z Combined heater / cooler

25. Plant
z Compressor and
M
electric motor
z Air receiver
z Isolating valve
z Air inlet filter

26. Pressure Control

27. Pressure regulators
z A pressure regulator symbol represents a normal state with
the spring holding the regulator valve open to connect the
supply to the outlet.
z The dotted line represents the feedback, this opposes the
spring and can vary the flow through the valve from full
flow, through shut off, to exhaust. The symbol is usually
drawn in only this one state. The flow path can be imagined
to hinge at the right hand end to first shut off the supply
then connect to the exhaust.
z Adjustable Regulator
simplified
z Adjustable Regulator with
p pressure g g gauge p
simplified

28. Filter Regulator Lubricator
z FRL Combined unit
zz FRL Simplified symbol

29. Pressure relief valves
z A pressure relief valve symbol represents a normal state
with the spring holding the valve closed.
z The dotted line represents feed-forward, this opposes the
spring and can be imagined to lift the flow path. When the
pressure reaches an excess value the flow path will line up
with the ports and flow air to relief.
z Adjustable relief valve
simplified
z Preset relief valve
simplified

30. Actuators

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

32. Single acting
z Single acting sprung
instroked
z Single acting sprung
outstroked
z Single acting sprung
instroked magnetic *
z Single acting sprung
outstroked magnetic *
* ISO 1219-1 provides no example for magnetic cylinders

33. Single acting without spring
z Single acting normally instroked
external force returns
z Single acting normally outstroked
external force returns
z Single acting normally instroked
magnetic external force returns
z Single acting normally outstroked
magnetic external force returns
Note: the hardware is usually double acting cylinders applied as single acting

34. Double acting
z Double acting adjustable
cushions
z Double acting through
rod
z Double acting magnetic *
z Double acting rodless *
* ISO 1219-1 provides no example for magnetic or rodless cylinders

35. Rotary actuators
z Semi rotary double
acting
z Rotary motor single
direction of rotation
z Rotary motor bi-directional

36. Simplified cylinder symbols
z Single acting load returns
z Single acting spring
returns
z Double acting non
cushioned
z Double acting adjustable
cushions
z Double acting
through rod

37. Valve symbol structure

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

39. Valve symbol structure
z 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)
zz The boxes are two pictures of the same valve
operated normal

40. Valve symbol structure
z A valve symbol shows the pictures for each of
the valve states joined end to end
operated normal

41. Valve symbol structure
z A valve symbol shows the pictures for each of
the valve states joined end to end
operated normal

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

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

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

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

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

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

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

49. Valve symbol structure
z 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

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

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

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

53. Valve symbol structure
z The recommended spacing of the connections
1/4 l 1 /4 l 1/4 l
1 l
1/2 l
1/4 l
1/2 l 1/2 l
1/4 l
1/2 l
1/4 l

54. Valve symbol structure
z 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
zz A variety of symbol patterns are possible
normally
closed
normally
open

55. Valve symbol structure
z 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
zz A variety of symbol patterns can be produced
Reverse connected

56. Valve functions

57. Valve functions
Basic valves before
added
Examples, push button operated
spring return
Normal position
operators are with Function 2/2
Function 3/2

58. Valve functions
Basic valves before
added
Examples, push button operated
spring return
Operated position
operators are with Function 2/2
Function 3/2

59. Valve functions
Basic valves before
added
Examples, push button operated
spring return
Normal position
operators are with Function 4/2
Function 5/2

60. Valve functions
Basic valves before
added
Examples, push button operated
spring return
Operated position
operators are with Function 4/2
Function 5/2

61. Valve functions 5/3
z Three position valves have a normal central
position that is set by springs or with a manual
control such as a lever
zz The flow pattern in the centre position varies
with the type. Three types will be considered
z 1, All ports sealed
z 2, Outlets to exhaust, supply sealed
z 3, Supply to both outlets, exhausts sealed

62. Valves 5/3
z All valves types shown in the normal position
z Type 1. All ports sealed
z Type 2. Outlets to exhaust
z Type 3. Supply to outlets

63. Valves 5/3
z All valves types shown in the first operated position
z Type 1. All ports sealed
z Type 2. Outlets to exhaust
z Type 3. Supply to outlets

64. Valves 5/3
z All valves types shown in the normal position
z Type 1. All ports sealed
z Type 2. Outlets to exhaust
z Type 3. Supply to outlets

65. Valves 5/3
z All valves types shown in the second operated position
z Type 1. All ports sealed
z Type 2. Outlets to exhaust
z Type 3. Supply to outlets

66. Valves 5/3
z All valves types shown in the normal position
z Type 1. All ports sealed
z Type 2. Outlets to exhaust
z Type 3. Supply to outlets

67. Operators

68. Operators
Manual
General manual Lever
Push button Pedal
Pull button Treadle
Push/pull button Rotary knob

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

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

71. Port markings

72. Port Markings
To CETOP RP68P
2
12 10
2
12 10
1 3 1
4 2
14 12
2 4
14 12
1
5 3
1 3

73. Port Markings
To CETOP RP68P
2
12 10
2
12 10
1 3 1
4 2
14 12
2 4
14 12
1
5 3
1 3

74. Port Markings
To CETOP RP68P
2
12 10
2
12 10
1 3 1
4 2
14 12
2 4
14 12
1
5 3
1 3

75. Port Markings
To CETOP RP68P
2
12 10
2
12 10
1 3 1
4 2
14 12
2 4
14 12
1
5 3
1 3

76. Port Markings
To CETOP RP68P
2
12 10
2
12 10
1 3 1
4 2
14 12
2 4
14 12
1
5 3
1 3

77. Function components

78. Function components
z Non-return valve
simplified
z Flow regulator uni-directional
z Flow regulator bi-directional
simplified
Note: The output can exhaust
back and is not trapped
z Two pressure ‘AND’
simplified
z Shuttle valve ‘OR’
simplified

79. Function components
z Quick exhaust valve with
silencer simplified
z Silencer
z Pressure to electric
switch preset
z Pressure to electric
switch adjustable

80. Symbol Library
zz Actuators z Function z Solenoid Valves
V l
Components
z Vacuum
z Valves
z Air Line
z Electrical and
electronic
Click the section arrow to go to it

81. Symbol Library
Actuators

82. Single acting cylinders
z Sprung in z Magnetic
sprung in
non-rotating
rod
z Sprung out
z Magnetic
z Magnetic
sprung in
g
sprung out
non-rotating
rod
z Magnetic
sprung out

83. Single acting cylinders
z Sprung in
adjustable cushion
z Sprung out
adjustable cushion
z Magnetic sprung in
adjustable cushion
z Magnetic sprung out
adjustable cushion

84. Single acting cylinders
z Sprung in
adjustable cushion
non-rotating rod
z Sprung out
adjustable cushion
non-rotating rod
z Magnetic sprung in
adjustable cushion
non-rotating rod
z Magnetic sprung out
adjustable cushion
non-rotating rod

85. Single acting bellows
z Bellows single
convolution
z Bellows double
convolution
z Bellows triple
convolution

86. Double acting cylinders
z Non-magnetic z Magnetic
hydraulic
z Non-magnetic
adjustable
cushioned
z Magnetic
adjustable
cushioned
z Non-magnetic
rod bellows
z Magnetic
adjustable
cushioned
rod bellows
z Magnetic

87. Double acting cylinders
z Non- M ti
rotating rod
z Magnetic
non-rotating
rod
z Active
brake
z Magnetic
active brake
z Passive
brake
z Magnetic
passive
brake
z Guided
rod
magnetic

88. Double acting cylinders
z Non-magnetic through
rod
z Non-magnetic adjustable
cushioned through rod
z Magnetic
through rod
z Magnetic adjustable
cushioned through rod

89. Double acting cylinders
z Three position adjustable
cushions (equal strokes)
z Three position adjustable
cushions magnetic (equal
strokes)
z Four position adjustable
cushions (unequal
strokes)
z Four position adjustable
cushions magnetic
(unequal strokes)

90. Other actuators
z With electronic analogue
output of piston position
z Slide unit
z Semi-rotary actuator
z Rotary motor bi-directional
and non-reversible

91. Rodless cylinders
z Cushioned z Cushioned
magnetic
z Cushioned
passive
brake
z Cushioned
magnetic
passive brake
z Cushioned
z Cushioned
active brake
magnetic
active brake

92. Rodless cylinders
z Twin stroke z Twin stroke
cushioned air through
carriage
z Twin stroke
cushioned
magnetic
z Twin stroke
air through
g carriage
magnetic

93. Shock absorbers
z Self
adjusting
z Adjustable

94. End

95. Symbol Library
Air Line Equipment

96. Combination units
z FRL with shut off valve
and pressure gauge
z Lubro-control unit
z Filter and lubricator

97. Combination units
z Breathing air set
z Filter regulator
z Filter regulator with
gauge

98. Filters
z Filter with manual drain
z Filter with automatic drain
z Filter with automatic drain
and pressure drop
indicator

99. Pressure regulators
z Pre-set relieving
z Pre-set relieving with
pressure gauge
z Adjustable relieving
z Adjustable relieving with
pressure gauge

100. Pressure regulators
z Pilot operated
z Pilot regulator with
independent feedback
z Pilot operated regulator
controlled from pilot
regulator

101. Pressure regulators
z Precision dual stage
(11-818)
z Proportional pressure
2
valve 3 1

102. Lubricator
z Lubricator

103. Pressure relief valves
z Preset, no means of
connection to exhaust
z Preset, tapped exhaust
port
z Adjustable, no means of
connection to exhaust
z Adjustable, tapped
exhaust port
z Pilot operated
Pil t t d

104. Other components
z Silencer
z Filter silencer
z Water separator
automatic drain

105. End

106. Symbol Library
Electrical and Electronic

107. Sensors
Loads must be additionally suppressed
brown +V
z Reed switch 2 wire
z Reed switch changeover
blue Load 0V
black
blue
Load 0V
Load
0V
z Reed switch 3 wire with led indicator
(emulating current sourcing pnp device)
brown +V
brown +V
blue 0V
Load
black 0V
z Reed switch 3 wire with led indicator
(emulating current sinking npn device)
blue 0V
brown +V
Load
black +V
z Reed switch 2 wire with led indicator brown +V
blue Load 0V

108. Sensors
Loads must be additionally suppressed
z pnp (current
brown +V
Solid state magnetic sensor sourcing)
z Solid state magnetic sensor plug in cable
pnp (current blue 0V
black
pnp
Load 0V
1
3
4
pnp
brown +V
blue 0V
sourcing)
bl k
z Solid state magnetic sensor npn
(current sinking)
black Load 0V
1
blue 0V
brown +V
black
npn
Load +V
z Solid state magnetic sensor plug in
cable npn (current sinking)
S lid t t ti ith l
3
4
npn
blue 0V
brown +V
black Load +V
z Solid state magnetic sensor with pulse brown +V
blue 0V
extension black Load 0V

109. Sensors
Loads must be additionally suppressed
1 brown +V
z Reed switch 2 wire with led indicator and
plug in cable
z Reed switch 2 wire with led indicator and 1
4 black Load 0V
+ brown
plug in cable
blue
Load 0V

110. Electrical Symbols

111. Electrical symbols
z Direct current
( z Line to earth
DC )
z Alternating
current z Line to chassis
( AC )
z AC or DC z Cell
z Positive and
negative z Battery or 12 V
polarity

112. Electrical Components
Normally
open
Normally
closed
Normally
open
Normally
closed
z Relay contact z General manual
switch contact
z Push button
contact
z Roller switch
contact
z Pull button
contact
z Delay to operate
z Twist switch
contact
z Delay to reset

113. Electrical Components
z Relay coil
z Relay coil delay to
operate contacts
z Relay coil delay to
reset contacts
z Solenoid valve
coil

114. Electrical Components
z Proximity switch z Bell
z Touch sensitive
switch
z Buzzer
z Pressure switch z Microphone P
z Supply and
return
z Loudspeaker 24V
0V

115. Electronic Component Symbols

116. Electronic Components
z Opto-isolator z Resistors
Resistor
z Windings
z inductor
inductor with core
z z Variable
z Potentiometer
z Pre z variable inductor
z transformer or
V
z Pre-set pot
z Voltage
dependent
z Light dependent
z Capacitors
z capacitor
polarised
z Diodes
z diode
z capacitor
z variable capacitor
z pre-capacitor
z zener diode
z light emitting diode
set

117. Electronic Components
z Thyristor z Fuse
z Triac z Wires connected or
z NPN Transistor z Wires crossing
z PNP Transistor z Double junction or
z Photo-transistor

118. Electronic Components
z Conductors
cable
z Motors dc & ac M M
in a z Conductors
twisted
z Generator G
z Plug and socket z Lamp steady
& flashing
z Coaxial plug and
socket
z Operational
amplifier
z Meters for
amps, volts,
A V
p , ,
ohms & watts W

119. End

120. Symbol Library
Function Fittings and Components

121. Function fittings
Bl ki fitti
2
12
z Blocking fitting
1
2
1
z Pressure reducing
fitting 1
g
P ti 2
z Pneumatic sensor
fitting

122. Function components
z Air fuse
z Non return valve
z Non return valve

123. Function components
z bi-directional flow
regulator
z Exhaust flow
regulator with and
without silencer
Sil
z Silencers
z Shuttle valve ‘OR’
z Two pressure valve
‘AND’ (will exhaust
either signal back)

124. Function components
zz Uni-directional
flow regulator
zz Quick exhaust
valve with and
without silencer
z Rotating joint
z Pressure indicator
z Pressure drop
indicator

125. Quick release couplings
z Both to exhaust
made released
z Source sealed
z Both sealed

126. End

127. Symbol Library
Solenoid Valves

128. Solenoid valves
with man override
on the solenoid
z Direct solenoid actuated
spring return 2/2 NC
12 2
10
2
12 10
z Direct solenoid actuated
spring 3/2 2
10
12
12 10
return 2 NC
Di t l id t t d
3 1
2
10
3 1
2 12
12 10
z Direct solenoid actuated
spring return 3/2 NO 3 1 3 1

129. Solenoid valves
with man override
on the solenoid
z Pilot solenoid actuated
2
12 10
2
12 10
spring return 3/2 NC 3
1
3
1
z Pilot solenoid actuated
spring 3/2
12 10
2
12 10
return 2 NO
3 1 3 1
Pil t l id t t d 2
2
z Pilot solenoid actuated
12 10
pilot solenoid return 1
3
12 10
1
3

130. Solenoid valves
4 2
Pil t l id t t d 14 12
5 1 3
z Pilot solenoid actuated spring return, 5/2
4 2
z Pilot solenoid actuated 14 12
spring return and manual
override, 5/2
5 1 3
4 2
z Pilot solenoid actuated
pilot solenoid return, 5/2
4 2
14 12
1
5 3
z Pilot solenoid actuated
pilot solenoid return and
manual override, 5/2
14 12
1
5 3

131. Solenoid valves
Reverse piped
4 2
Pil t l id t t d 14 12
z Pilot solenoid actuated
spring return, 5/2 5 1 3
4 2
z Pilot solenoid actuated 14 12
spring return and manual
override, 5/2
5 1 3
4 2
z Pilot solenoid actuated
and returned, 5/2
4 2
14 12
1
5 3
z Pilot solenoid actuated
and returned with manual
overrides, 5/2
14 12
5 1 3

132. Solenoid valves
14 4 2
12
z Double pilot solenoid
actuated spring to centre
all ports sealed reverse
piped
1
5 3
2
z Priority pilot solenoid 12 10
1
3
actuated differential air 4 2
14 12
return, 3/2
z Priority pilot solenoid
actuated differential air
5 1 3
return, 5/2

133. Solenoid valves
z Priority pilot solenoid
actuated differential air
2
12 10
return, 3/2 3 1
4 2
z Priority pilot solenoid 14 12
t t ddiff ti l i
2
12 10
5 1 3
actuated differential air
return, 5/2
z Priority pilot solenoid
z solenoid
4 2
14 12
1
3
y p actuated air spring return,
3/2
Priority pilot actuated air spring return,
5/2 5 1 3

134. Solenoid valves
Pil t l id t t d
4 2
z Pilot solenoid actuated 14 12
spring return, manual
override, 5/2 with integral
flow 5 1 3
regulators
z Double pilot solenoid
actuated, manual
id 2 ith i t l
4 2
14 12
5 1
3
override, 5/with integral
flow regulators

135. Solenoid valves
14 4 2 12
z Double pilot solenoid
actuated, spring to centre
all ports sealed, 5/3 with
integral flo reg lators
5 1 3
flow regulators
z Double pilot solenoid
actuated, spring to centre
l ld /3 i h
14 12
4 2
5 1
3
supply port sealed, 5/with
integral flow regulators
z Double pilot solenoid
14 4 2 12
actuated, spring to centre
supply to outlets, 5/3 with
integral flow regulators
5 1 3

136. Proportional solenoid valves
4 2
z Proportional flow to
electrical signal
5 1 3
z Proportional pressure to
electrical signal
1
2
3

137. Safety related valves
z dump valve
12 2 10
Monitored 3 1
z Soft start valve 12 2
10
3 1

138. End

139. Symbol Library
Valves

140. Valves un-tapped exhaust
z Plunger actuated spring 2
12 10
return 3/2
3 1
2
z Roller actuated spring 12 10
return 3/2
2
12 10
1
3
3 1
z Push button actuated
spring return 3/2
z knob 2
12 10
1
3
2
12 10
z Toggle actuated
detented 3/2
Rotary actuated
detented 3/2
z Key actuated
detented 3/2
3 1
2
12 10
3 1

141. Valves integral bleed supply
z Plunger / bleed actuated 2
12 10
air return 3/2
z Roller / bleed actuated air
return 3/2
2
12 10
1
3
z One way trip / bleed
actuated air return 3/2
2
12 10
3
1
3
z Low pressure / bleed
actuated air return 3/2
z Antenna / bleed 2
12 10
2
12 10
1
3
1
actuated
air return 3/2
1
3

142. Valves external bleed supply
z Plunger / bleed actuated 2
12 10
air return 3/2
z Roller / bleed actuated air
return 3/2
3
2 1
12 10
z One way trip / bleed
actuated air return 3/2
2
12 10
3
3
1
z Low pressure / bleed 2
actuated air return 3/2
z Antenna / bleed 2
12 10
12 10
3
1
1
actuated
air return 3/2
3
1

143. Pilot actuated valves
NC NO
z actuated spring
2 12 2
Pilot return 2/2
12 10
10
1
1
z Pilot actuated spring
2
2
12 10
return 3/2 1
3
12 10
3 1
2
2
z Double pilot actuated 3/2 12 10
12 10
1
3
3 1
z Differential pilot actuated
3/2
2
12 10
3 1
2
12 10
1
3

144. Pilot actuated valves
z NC NO
Pressure or vacuum
12
2
12
2
10
actuated spring return
3
1
2/2 (diaphragm valve) 10
3 1
z Low pressure pilot 2
2
actuated spring
return 3/2
12 10
2
12 10
1
3
3 1
z Low pressure pilot 2
actuated pilot
return, 3/2
12 10
3 1
12 10
1
3
z Low pressure pilot
actuated and
returned, 3/2
2
12 10
3 1
2
12 10
1
3

145. Pilot actuated valves
z Remote pressure 2
12 10
12 2
10
bleed actuated spring
return, NC, 3/2
z Remote press re
1 3 1
12 2
2
pressure
bleed actuated spring
return, NO, 3/2
12 10
3 1
10
1
z Remote pressure
bleed actuated spring
return, 5/2
12 2
4 2
14 12
10
1 1
5 3
,

146. Pilot actuated valves
act ated 2 4
z Pilot actuated spring
return, 4/2
z actuated spring
14 12
1
3
4 2
Pilot 14 12
return, 5/2
z Double pilot actuated 5/2
5 1 3
4 2
14 12
4 2
5 1 3
z Differential pilot actuated
14 12
5/2
5 1 3

147. Pilot actuated valves
z 14 4 2
12
Pressure or vacuum
actuated spring return,
5/2 (diaphragm valve)
5 1 3
4 2
14 12
z Low pressure pilot
actuated spring
return, 5/2
5 1 3
4 2
14 12
z Low pressure pilot
actuated pilot
return, 5/2
5 1 3
4 2
14 12
z Low pressure pilot
actuated and
returned, 5/2
5 1 3

148. Pilot actuated valves
4 2
z Double pilot actuated
spring to centre all ports
sealed
5 1 3
z Double pilot actuated
spring to centre supply
l d
4 2
5 1
3
port sealed
z Double pilot actuated
4 2
spring to centre supply to
outlets
5 1 3

149. Mechanically actuated valves
NC NO
z Plunger actuated spring
return 2/2
12 2
10
1
2
12 10
1
z Plunger actuated spring
return 3/2
2
12 10
2
12 10
Pl t t d i t
3 1 3 1
2
12 10
2
12 10
z Plunger actuated air reset
3/2 3 1
3 1

150. Mechanically actuated valves
Pl t t d i 2 4
z Plunger actuated spring 14 12
return, 4/2 1 3
z Plunger actuated spring
4 2
14 12
return, 5/2 1
5 3
z Plunger actuated air reset
4 2
g 14 12
5/2 5 1 3

151. Mechanically actuated valves
NC NO
z Roller actuated spring
return 2/2
12 2
10
1
2
12 10
1
z Roller actuated spring
return 3/2
2 2
12 10 12 10
R ll t t d i t
3 1 3 1
2
12 10
2
12 10
z Roller actuated air reset
3/2 3 1
3 1

152. Mechanically actuated valves
R ll t t d i 2 4
z Roller actuated spring 14 12
return, 4/2 1 3
z Roller actuated spring
4 2
14 12
return, 5/2 1
5 3
z Roller actuated air reset
4 2
14 12
5/2 5 1 3

153. Mechanically actuated valves
NC NO
z One way trip actuated
spring return 2/2
12 2
10
1
2
12 10
1
z One way trip actuated
spring 3/2
12 10
2
12 10
return 2
O ti t tdi
3 1 3 1
2
12 10
2
12 10
z One way trip actuated air
reset 3/2 3 1
3 1

154. Mechanically actuated valves
O ti t td 2 4
z One way trip actuated 14 12
spring return, 4/2 1 3
z One way trip actuated
4 2
14 12
spring return, 5/2 1
5 3
z One way trip actuated air
4 2
y p 14 12
reset 5/2 5 1 3

155. Manually actuated valves
NC NO
z Push button actuated
spring return 2/2
2
12 10
1
12 2
10
1
z Push button actuated
spring 3/2
12 10
2
12 10
return 2
P hb tt t t d i
3 1 3 1
2
12 10
2
12 10
z Push button actuated air
reset 3/2 3 1
3 1

156. Manually actuated valves
P hb tt t t d
2 4
z Push button actuated 14 12
spring return, 4/2 1 3
z Push button actuated
4 2
14 12
spring return, 5/2 1
5 3
z Push button actuated air
4 2
14 12
reset 5/2 5 1 3

157. Manually actuated valves
NC NO
z Lever actuated spring
return 2/2 12
2
10
1
2
10
12
1
z Lever actuated spring
return 3/2
2
12
10
2
12
10
L t tdi t
3 1 3 1
2
10
2
z Lever actuated air reset 10
12
3/2 3 1
12
3 1

158. Manually actuated valves
L t td i 2 4
z Lever actuated spring 12
14
return, 4/2 1 3
z Lever actuated spring
4 2
return, 5/2 1
5 3
14
12
z Lever actuated air reset
4 2
12
14
5/2 5 1 3

159. Manually actuated valves
L t tdl
2 4
z Lever actuated lever 12
return, variable throttling,
4/2
14
1 3
z Lever actuated lever
return, variable throttling,
d d4/2
2 4
12
1 3
14
detented, 4/z Rotary knob actuated and 14
2 4
y 12
returned, variable
throttling, 4/2 1 3

160. Manually actuated valves
14 4 2 12
z Lever actuated spring to
centre all ports sealed 5 1 3
z Lever actuated spring to
14 12
4 2
centre supply port sealed 1
5 3
z Lever actuated spring to
14 4 2 12
centre supply to outlets 5 1 3

161. Manually actuated valves
14 4 2
z Lever actuated, detented,
all ports sealed centre 5 1 3
12
z Lever actuated, detented,
4 2
supply port sealed centre 1
5 3
14
12
z Lever actuated, detented,
14 4 2
supply to outlets centre 12
5 1 3

162. Manually actuated valves
NC NO
z Pedal actuated spring
2
return 3/2 3
1
12
10
2
3 1
12
10
z Treadle actuated detented
2
3/2 3
1
12
10
2
12 10
3 1

163. Manually actuated valves
P d l t t d i 14 2 4
z Pedal actuated spring
return, 4/2 1 3
12
z Pedal actuated spring
4 2
return, 5/2 1
5 3
14
12
z Treadle actuated detented
14 4 2
12
5/2 5 1 3

164. Manually actuated valves
14 4 2 12
z Treadle actuated spring
to centre all ports sealed 5 1 3
z Treadle actuated spring to
14 12
4 2
centre supply port sealed 1
5 3

165. Manually actuated valves
14 4 2
z Treadle actuated,
detented, all ports sealed
centre
5 1 3
12
z Treadle actuated,
detented, supply port
l d
4 2
5 1
3
14
12
sealed centre

166. Manually actuated valves
z Push button actuated 2
rotary manual return 3/2
P hb tt t t dk
12 10
1
3
z Push button actuated key 2
return 3/2
P h t t d ll 2
12 10
1
3
z Push actuated pull 12 10
1
3
returned 3/2
z Push actuated pull or air
2
12 10
returned 3/2 1
3

167. Safety related valves
z dump valve
12 2 10
Monitored 3 1
z Emergency stop valve
2
12 10
1
3
z Soft start valve
12 2
10
3 1

168. Special purpose valves
2
z Impulse generator
1
3

169. End

170. Symbol Library
Vacuum Equipment

171. Vacuum equipment
z Vacuum generator
z Vacuum cups
z Vacuum switch
NC NO
2 2
pneumatic 3 1 3 1

172. Vacuum equipment
z Vacuum switch electric,
normally open and
normally closed
z Vacuum transducer with
analog and switched
V dc
Analog out
Switch out
0 V
+V dc supply (brown)
Analog out (white)
Switch out (black)
0 V (blue) Load
outputs npn
z Vacuum transducer with +V dc supply (brown)
Analog out (white)
Switch out (black)
0 V (Load
V dc
Analog out
Switch out
0 analog and switched
outputs pnp
V blue)

173. Vacuum equipment
z Vacuum filter
z Vacuum silencer
z Vacuum gauge

174. End