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aussiedownunder
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Join Date: Apr 2008
Posts: 16
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K values for fittings and valves

04/27/2008 2:25 AM

Can anyone provide a comprehensive K values for fittings and valves? including any related graphs. But I need them in metric.

Greatly appreciated
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Electroman
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United Kingdom - Member - Olde Member!! Engineering Fields - Instrumentation Engineering - New Member

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#1

Re: K values for fittings and valves

04/27/2008 10:20 AM

If you contact your local pneumatic supplier or manufacturer they will have all the details you could wish for relating to the Kv factor for their products.

I know KV pneumatics and SMC pneumatics have full data for their products in their catalogues, but I'm not sure about their websites...

John.

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Electroman
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#2
In reply to #1

Re: K values for fittings and valves

04/27/2008 10:24 AM

Here you go.... these data tables are for Cv values which are for air the Kv is for water flow I think?

http://www.coastpneumatics.net/techtables/index.php

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Hornfan
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Join Date: Feb 2008
Location: Houston, Texas
Posts: 6
#3

Re: K values for fittings and valves

04/28/2008 3:47 PM

Crane Technical Paper 410 has been the standard for years in the US, they now also have metric version.

http://www.flowoffluids.com/tp410.htm
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healybj8
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Location: Raleigh, NC
Posts: 148
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#4

Re: K values for fittings and valves

04/28/2008 3:56 PM

Crane (and other K-values) are fine unless you have laminar flow, then they don't work. Most posted K-values are for turbulent flow only. Beware.
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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Location: Cairo, Egypt
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#5

Re: K values for fittings and valves

04/29/2008 4:27 AM

Additional information related with the equivalent lengths of pipe of various valves & fittings (L/D) used in estimating total head loss due to friction: Hf = f (L/D)(V2/2g)

Valve/Fitting

Equivalent

length L/D

Drawing

Elbows : # 90o Short radius

# 90o Long radius

# 45o Short radius

# 45o Long radius

30

20

16

12

Tees* :Branch flow

Run flow

60

20

Laterals* : Branch-Run flow

Run-Branch flow

Run-Run

Run-Run

Branch-Run reverse

Run-Branch reverse

30

40

20

25

130

130

Valves: # Globe-conventional

# Globe-60o Y Pattern

# Globe-45o Y Pattern

# Angle-Conventional

# Cock -Straight through

-Three way-Run

-Three way-branch

Check -Conventional Swing

-Clearway Swing

-Globe Lift or Stop

-Angle Lift or Stop

-Inline Ball

Gate-Disk

340

175

145

145

18

44

140

135

50

345

145

150

13

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aussiedownunder
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Join Date: Apr 2008
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#6
In reply to #5

Re: K values for fittings and valves

04/29/2008 5:08 AM

Abdel,

Thank you so much. This is what I am looking for.

Aussiedownunder
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Maxozone
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Join Date: Mar 2008
Posts: 15
#7

Re: K values for fittings and valves

04/29/2008 9:57 AM

I found a chart at this site that might help:

http://www.westerndynamics.com/Download/friclossfittings.pdf
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aussiedownunder
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#8
In reply to #7

Re: K values for fittings and valves

04/29/2008 11:58 PM

Thanks

Can these K values be used for metric?

aussiedownunder
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Users who posted comments:

Abdel Halim Galala (1); aussiedownunder (2); Electroman (2); healybj8 (1); Hornfan (1); Maxozone (1)

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