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UNIT 3:VALVE

APPLICATION

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DCV:Symbol Development

Each valve swtchn! poston

s "ep"esente# by a s$%a"e&

 The n%mbe" o' s$%a"es co""espon#s

to the n%mbe" o' swtchn! postons&

Lnes n#cate the (ow path&

A""ows show the #"ecton o' (ow&

Sh%t)o* postons a"e #ent+e# n the

bo,es by lnes #"awn at "!ht an!les&

 The connectons -nlet an# o%tlet po"ts.

a"e show by lnes on the o%ts#e o' the

bo,&

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DCV: Po"ts an# Postons

N%mbe" o' po"tsN%mbe" o' swtchn! postons

/0/)way valve

30/)way valve1

no"mally close#

30/)way valve1

no"mally open

20/)way valve

0/)way valve

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Po"t an# Lette"n!

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E,amples:

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4etho#s o' act%aton

MANUAL   MECHANICAL ELECTRICAL   PNEUMATIC

5ene"al

P%sh 6%tton

Leve"

Pe#al

Detent

Sp"n!

6%tton

7olle"

I#le 7olle"

Soleno#

P"opo"tonalSoleno#

Pne%matc

MANUAL   MECHANICAL ELECTRICAL   PNEUMATIC

5ene"al

P%sh 6%tton

Leve"

Pe#al

Detent

Sp"n!

6%tton

7olle"

I#le 7olle"

Soleno#

P"opo"tonalSoleno#

Pne%matc

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DI7ECTIONAL CONT7OLVALVE

/0/ way1 30/ way     20/ way1 0/way

2

1 3

2

1 3

4 2

5

1

3

4 2

5

1

3

N0C N0O1P61Sp"n!"et%"n

Sn!leplot

Do%bleplot

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2

1 3

4 2

5

1

3

Inle

t

O%tlet

E,ha%s

t

E,ha%s

t

E,ha%s

t

8

O%tlet

Inle

t

Symbol an#Po"t

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NON 7ETU7N VALVE

One waycont"olvalve

9%c E,ha%stvalve

 Two p"ess%"e valve-AND.

Sh%ttle valve-O7.

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ONE ;A< =LO; CONT7OLVALVE

Symbol 7%pabent%

100%

6e"'%n!s seba!a membena"an%#a"a te"mampat melal% #lm sat%

a"ah saha>a&

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C"c%t

     4     0     %

2

1 3

     3

     0     %

4 2

5

1

3

     3     0     %

4 2

5

1

3

E,ten#: slow7et"act: =aste"

E,ten#: =aste"7et"act: Slow

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/ P7ESSU7E VALVE

Symbol 7%pabent%

6e"'%n!s men!%t lo!c AND

1 1

2

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C"c%t 8

;th / p"ess%"evalve

;tho%t / p"ess%"evalve

1 1

2

2

1 3

2

1 3

2

1 3

2

1 3

2

1 3

2

1 3

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C"c%t /

;th / p"ess%"evalve

;tho%t / p"ess%"evalve

2

1 3

2

1 3

4 2

5

1

3

2

1 3

2

1 3

4 2

5

1

3

1 1

2

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S?UTTLE VALVE

Symbol 7%pabent%

6e"'%n!s men!%t lo!c O7

1 1

2

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C"c%t

2

1 3

2

1 3

4 2

5

1

3

1 1

2

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9UIC@ E?AUST VALVE

Symbol 7%pabent%

6e"'%n!s mempe"cepatanpe"!e"aan pston p# po"t e,ha%st

1

2

3

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C"c%t

4 2

5

1

3

1

2

3

1

2

3

2

1 3