Custom Fabricated Butterfly Valves

Butterfly Valve Flow Coefficients

U.S. Gallons per minute Water at Pressure drop 1 Psi
 
  VANE ANGLE (degrees)
VALVE SIZE
inches
WIDE OPEN 90 80 70 60 50 40 30 20 FULL CLOSED 0
54 178,000 113,000 67,000 43,000 28,000 18,000 11,000 6,600 0
60 219,000 140,000 83,000 53,000 34,000 22,000 14,000 8,100 0
66 265,000 170,000 100,000 65,000 41,000 27,000 17,000 9,800 0
72 316,000 202,000 119,000 77,000 49,000 32,000 20,000 12,000 0
78 370,000 237,000 140,000 90,000 58,000 37,000 24,000 14,000 0
84 430,000 275,000 162,000 105,000 67,000 43,000 28,000 16,000 0
92 515,000 329,000 195,000 126,000 80,000 52,000 33,000 19,000 0
96 561,000 359,000 212,000 137,000 87,000 56,000 36,000 21,000 0
108 681,000 382,000 258,000 170,000 105,000 68,000 42,000 25,200 0
114 804,000 451,000 304,000 201,000 124,000 80,000 50,000 30,000 0
120 949,000 532,000 359,000 237,000 146,000 94,000 59,000 35,000 0
132 1,120,000 628,000 424,000 280,000 172,000 111,000 70,000 41,000 0
144 1,322,000 741,000 500,000 330,000 203,000 131,000 83,000 48,000 0