60-2102—7 4
Fig. 3—Pressure drop versus capacity. Maximum opening angles shown are used as trial settings when
adjusting valves for high fire.
M9527
100
100
1 2 34567891 2 34567891 2 34567891
90
80
70
60
50
40
30
20
10
9
8
7
6
5
4
3
2
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1000 10000 100000
CAPACITY, IN cf/h WITH 0.64 SP. GR. GAS [1 cf/h = 0.0283 m
3
/hr]
PRESSURE DROP, INCHES WC [1 in. wc = 0.25 kPa]
2 in.
3 in.
4 in.
1 in.
1
2
MAXIMUM
OPENING
ANGLE
30°
40°
50°
30°
50°
45° 57°55°
45°35°
45°
40°
50°
60°
40°
50°
60°
55° 45°
55°
V51E
SPECIFICATIONS
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