FLOW COEFFICIENT

CAST STEEL VALVES

GATE VALVES

GLOBE VALVES

SWING CHECK VALVES


DN	150	300	400	600	900	1500	2500
1 1/2"	130	130	130	130	112	112	73
2"	240	240	240	240	210	210	130
2 1/2"	380	380	380	380	310	310	230
3"	560	560	560	560	520	475	310
4"	1000	1000	1000	1000	950	850	520
5"	1650	1650	1650	1650	1500	1400	900
6"	2400	2400	2400	2400	2230	1900	1300
7"
8"	4400	4400	4400	4300	4000	3500	2400
10"	7100	7100	7100	6800	6130	5500	3750
12"	10200	10200	10200	9800	9000	8000	5400
14"	13000	13000	12300	11900	11000	9500
16"	17000	17000	16200	15900	14500	12500
18"	22000	21500	21500	20100	18500	16000
20"	27500	27000	26000	25000	24000	20000
22"	34300	33500	32600	30700	28100	24400
24"	40200	39800	39500	37500	34000	29500
26"	49900	48800	46700	43700	40000	34600
28"	58300	57200	54400	50900	46800	40800
30"	67800	66500	63000	58900	53900	48000
32"	75500	75500	75500	75500
34"
36"	96000	96000	96000	96000
38"
40"
42"	132000	132000	132000	132000
44"
46"
48"	175000	175000	175000	175000
50"
52"
54"
56"
58"
60"	279000	279000	279000	279000
62"
64"
66"

FLOW COEFFICIENT " cv " DEFINITION:
FLOW RATE in Gallons Per Minute of 60° F Water
with 1.0 Psi Pressure Drop Across Valve.

NOMENCLATURE:
d = Bore Diameter (Inch) ⁽¹⁾^{K = Resistance Coefficient

Q = Rate of Flow (Gallons Per Minute)

D P = Pressure Drop (Psi)

r =Weight density Of Fluid (Pounds Per Cubic Ft)}

^{NOTE:

(1) Bore Diameter as Per Asme B16.34}For 32" and Over Bore Diameter Was Considered as Per Api 6d.

ORION S.p.A, via Caboto, 8 34148 - Trieste ITALY