流量系数 Cv FLOW COFFICIENTS
Cv FLOW COEFFICIENTS
1200 1050
600 600
2200 2100 1800
800 800 790
5150 5100 4600 | 4380
50 | om0 | oo ko DATA FOR CALCULATION OF FLOW
9500 9400 9000 | 8500 The coefficient of flow Cv expresses the rate of
flow in gallons per minute at 60°F water with a
4300 4300 4300 4450 pressure drop of 1 psig across the valve.The Cy
15000 | 15000 | 14700 | 14500 coefficients for the various types and sizes,
7550 7550 7550 8000 shown in the tables, have been determined
6000 6000 6000 | 6100 from actual flow tests.
23000 | 23000 | 22500 | 21100
14000 | 14000 | 14000 | 12800
NOTE: K, is the metric equivalent of C,,.
Ky = Cy x 0.85
9100 | 9100 | 9100 | 8900 -
28000 | 28000 | 28000 | 25000 - FOR LIQUIDS:
15000 | 15000 | 15000 | 14200 - M aq-c AP
L ™ e
37200 | 37200 | 37200 | 34500 - G,
21000 | 21000 | 21000 | 19200 . . Q,\2
15300 | 15300 | 15300 | 13800 人 AP -ct 人 = )
49000 | 49000 | 49000 | 45000 = Y _
WHERE: Qi = Flow in U.S. gallons per minute.
28400 | 28400 | 28400 | 25000 2 > 人 en 脐 ia 5P
59000 59000 59000 55200 L = pecific grav:tyo qui water =1 at
28200 | 28200 | 28000 | 25100 - FOR GASES:
68200 | 68200 | 68200 | 62000 -
P,+ P
92000 | 92000 | 92000 | 83800 - 3 q,=1360C, GA—E V5=
36000 | 36000 | 36000 | 32900 - 2
110000 | 110000 | 110000 | 98500 . @ ap=p,-\ Pz ZGQT(%-)Z
121000 | 121000 | 121000 | 113000 - i
145000 | 144000 | 144000 | 130000 & WHERE: Qg = Volumetric flow of gas (SCFH) 本
Ge = Specific gravity of gas at standard conditions
& i h d 60°F =1
167‘:]‘:]‘:]‘:] 167?0050 1‘;“;’;& 16;1":]‘:]‘:] T s o a0 P
87000 | 87000 | 87000 | 69500 -
210000 | 210000 210000 | 198200 - NOTE: For gas, max. AP = 区 Pana min.
267500 | 267500 | 267500 _ P2 = "2 Py, and P1, P2 are absolute pressures (psia)
96700 | 96700 | 96000
280000 | 280000 | 280000
384000 | 384000 | 384000
89000 | 89000 | 89000
521000 | 521000 | 521000
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