Page 256 -

The Practical Pumping Handbook . . . . . . . . . . . . . . . . . . . .

14.2 Typical resistance coefficients for valves and
fittings

~ A REGULAR ....... ............... ~ ................. ~i .................... ~ ...................................
BELL-MOUTH ~ ~ ~ ] 4 5 o ELL. '
INLET OR REDUCER 1 ~ ~ ~ K '3
t | ".
I ~ ........................................ ,..i,:*:;~!:.:: ...... .:.~i!!,i"::i~il ...... ,i~i~,~!~!::ii!~::i~!:::~
L" N" K .a ~;~ ;~;~iii ~ii!i!~i;;i:
~~''::~~! ;;
' ~ ~ ' U f,;i 2 ::::::::::::::::/: :: ::::::l:: :.]i:.;;hii!::!~ii!];::iii!iii'::::i!i!iii}iiiii~;~;~ ii~!i;ii!iiiiiii!ii:iii::~ii:::;i:i~i;i;i~i.i:i;::~ii::::
; ~::::~'ii:::~'~'~-:~:~";~' ' .......
(:;:~:;;~ ...........
SQUARE EDGED INLET ~ z ~ ] RADIUs ' ~
m,,~ 1 2 6_ .ii:O:: :.:20:
.................................................................. ~" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . !~t~;i~!~-~.;:.ii~;:::..!~ : ~
INWARD P RO dE T C tNG Pt PE ,, !~' ~iii~;i~!::..).~!ii
. . . . . REWED r,,
! ~ ~ FRETURN
':~ . BEND .6.
FLANGED .4
NOTE: K DECREASES WITH RETURN .3
INCREASING WALL THICKNESS OF BEND .2
PIPE AND ROUNDING OF EDGES K.1 iliii

SCREWED i ":i " :: ~ LINE
REGULAR
0 ~ ELL. K " . . . . . FLOW
K:~~
.3 .5 :t
6
~ ~ ' ~ ".3 .... .-5 ........ -i---D-2 .... -~ SCREWED
LONG -8 :~'::::~-~ TEE
~ ~ ~ RADIUS 6 [~ 2 i))iiil)iiiiil,)ii)iiiiiI!ii!i)!!tlil)~;~-
~ ~ SCREWED
BRANCH
FLOW
D I
'nl ~. R EG U LAR .6 i:':'~ !i~iiil':'!/~ ;~i.~iTiill TII:::: .i ;i;/::i::i;i:~i~;ili=:~i .....
~ ~
~ ............ ~
ELL. ~'
...... ~ o o FLANGED ~i~i~...'..~'~ LINE K
~ ~ K 2 i!;!ii
"-" " ~ OG L N .... :: F LANG E D ...... !~i:~i~' ~iiiiiiii':ii~i~T i~ ~!
T
~-ili!ii~ii!i!?:~i i:i~ii::i:ii .
EE
i;i~iiii .....
~ ~ R A D I U S 1 !::i~ii:i!ii ffiii ~ii iiii~ilili.iiiiiiii!!t~!il ....
~ ~ ~ FLANGED K iii ii:, ......... iiii;',;iiiiii;iii
~ o .6 ............ ;!
. FLOW
V*
h = K m FEET OF FLUID
2g
Figure 14.10: Typical resistance coefficients for valves and fittings (Reproduced with the
permission of The Hydraulic Institute)

234