Powers 597 Series Flowrite II Heavy Duty Balanced Control Valves - Manual (Page 5)

TI597SI Page 5
50
250
200
150
100
50
300
150
100
Pressure — psig
T
e
mperature —
°F
200
Maximum Media
Temperature
281°F
Minimum Media
Temperature
40°F
169 psig
597 SI
Figure 3 - Temperature and Pressure Ratings
TEMPERATURE/PRESSURE RATINGS
In all cases, do not exceed the temperature/pressure
ratings of the valve (see figure 3). Acceptable region is
shown by the shaded area.
Steam Inlet Pressure (psig) 75 100 125
Pressure Drop (max)
Across Valve (psi) 10 20 30 40 45 10 20 30 40 50 10 20 30 40 50
Valve Cv
Size Rating
2.5 56 4840 6640 7873 8781 9146 5508 7610 9096 10236 11138 6104 8470 10172 11508 12595
3 85 7347 10079 11950 13329 13882 8361 11552 13806 15537 16906 9265 12857 15440 11467 19117
4 145 12533 17193 20386 22738 23681 14263 19706 23551 26504 28839 15805 21932 26339 29797 32611
5 240 20744 28457 33742 37635 39196 23607 32616 38981 43868 47734 26159 36302 43595 49320 53977
6 370 31980 43871 52018 58021 60426 36395 50283 60096 67630 73590 40329 55966 67209 76035 83215
Where:
W = Steam flow (lbs/hr)
Cv = Valve Flow Coefficient (US gpm with ΔP = psi)
K = 1+ (0.0007* ºF superheat)
P = Pressure differential, P1 - P2 (psi)
P1 = Inlet Pressure (psia)
P2 = Outlet pressure (psia)
Absolute Pressure = Gauge pressure + .7 (psia)
Δ