Bulletin 74.1:T205
23
Table 11. C
v
Coefcient of T205 Series with 3/4 in. / DN 20 Body Size
SPRING RANGE
AND COLOR
OUTLET
PRESSURE
SETTING
OFFSET FROM
SETPOINT
INLET
PRESSURE
C
v
COEFFICIENT
Orice Size, In. / mm
1/8 / 3.2 1/4 / 6.4 3/8 / 9.5 1/2 / 13 9/16 / 14
psig bar
TYPE
T205 T205M T205 T205M T205 T205M T205 T205M T205 T205M
1 to 2.5 in. w.c. /
2.5 to 6.2 mbar
Orange
1 in. w.c. /
2.5 mbar
-1 to 2 in. w.c. /
-2.5 to 5.0 mbar
1 0.07 0.3 0.3 1.0 1.3 1.4 2.1 2.6 2.9 2.5 3.2
2 0.14 0.4 0.4 1.2 1.3 1.9 2.3 2.1 2.8 2.4 4.2
5 0.34 0.4 0.4 1.2 1.5 1.5 2.2 1.9 3.7 2.0 3.8
10 0.69 0.4 0.4 1.1 1.5 1.3 2.6 1.8 3.4 1.8 3.4
15 1.0 0.4 0.4 1.1 1.5 1.3 2.1 1.6 2.9 1.2 5.1
20 1.4 0.4 0.4 1.1 1.5 1.2 2.7 1.5 4.4 1.1 4.4
30 2.1 0.4 0.4 1.0 1.8 1.1 2.7 1.0 4.4
40 2.8 0.4 0.4 1.0 2.0 0.7 1.8
60 4.1 0.4 0.4 0.8 1.7 0.5 3.0
80 5.5 0.4 0.4 0.5 1.4
100 6.9 0.4 0.4 0.4 1.4
125 8.6 0.4 0.4 0.4 1.4
150 10.3 0.4 0.4
175 12.1 0.3 0.4
200 13.8 0.2 0.4
2 in. w.c. /
5.0 mbar
-1 to 2 in. w.c. /
-2.5 to 5.0 mbar
1 0.07 0.3 0.3 1.0 1.2 1.3 2.0 2.0 2.4 2.1 3.2
2 0.14 0.3 0.4 1.1 1.4 1.8 2.0 1.9 2.2 2.2 3.3
5 0.34 0.4 0.4 1.1 1.4 1.4 2.0 1.7 2.9 1.9 2.8
10 0.69 0.4 0.4 1.1 1.4 1.2 1.8 1.7 2.8 1.7 3.1
15 1.0 0.4 0.4 1.0 1.4 1.2 1.7 1.6 2.7 1.2 4.0
20 1.4 0.4 0.4 1.0 1.4 1.2 2.2 1.1 2.5 0.9 3.4
30 2.1 0.4 0.4 1.0 1.4 1.0 2.4 0.8 2.4
40 2.8 0.4 0.4 0.9 1.4 0.7 1.6
60 4.1 0.4 0.4 0.8 1.4 0.9 1.9
80 5.5 0.4 0.4 0.4 1.1
100 6.9 0.4 0.4 0.4 1.3
125 8.6 0.4 0.4 0.3 1.4
150 10.3 0.3 0.4
175 12.1 0.3 0.4
200 13.8 0.2 0.4
2.5 to 7 in. w.c. /
6.2 to 17 mbar
Red
2.5 in. w.c. /
6.2 mbar
-1 to 2 in. w.c. /
-2.5 to 5.0 mbar
1 0.07 0.3 0.3 0.6 0.8 1.1 1.2 1.5 2.5 1.5 1.9
2 0.14 0.3 0.3 0.6 0.9 1.4 1.0 1.6 1.2 1.5 1.8
5 0.34 0.3 0.4 0.6 0.5 1.0 1.2 1.4 1.6 1.5 1.8
10 0.69 0.4 0.4 0.7 0.8 1.0 1.0 1.4 1.5 1.5 1.6
15 1.0 0.4 0.4 0.7 0.9 1.0 1.1 1.4 1.2 1.2 2.4
20 1.4 0.4 0.3 0.7 0.8 1.1 1.2 1.4 1.4 1.0 2.1
30 2.1 0.4 0.3 1.2 0.9 0.9 1.1 0.7 2.2 0.8 1.0
40 2.8
0.4 0.4 0.7 0.8 0.8 0.9 0.5 2.8
60 4.1 0.3 0.3 0.7 0.6 0.9 1.1
80 5.5 0.3 0.3 0.5 0.6 0.4 1.7
100 6.9 0.3 0.3 0.7 0.6
125 8.6 0.3 0.3 0.3 0.5
150 10.3 0.3 0.3 0.3 1.2
175 12.1 0.3 0.3 0.3 1.4
200 13.8 0.2 0.3
4 in. w.c. /
10 mbar
-1 to 2 in. w.c. /
-2.5 to 5.0 mbar
1 0.07 0.3 0.4 0.5 0.8 0.8 1.3 1.3 1.4 1.3 1.4
2 0.14 0.3 0.3 0.6 0.8 1.2 0.9 1.4 0.9 1.4 1.5
5 0.34 0.3 0.3 0.7 0.4 1.0 0.9 1.2 1.3 1.4 1.5
10 0.69 0.3 0.3 0.7 0.7 0.9 0.9 1.3 1.3 1.6 1.4
15 1.0 0.3 0.3 0.7 0.7 1.0 1.0 1.3 1.3 1.0 1.4
20 1.4 0.3 0.2 0.8 0.7 1.0 0.9 1.3 1.1 0.9 1.4
30 2.1 0.3 0.3 1.1 0.8 0.9 1.0 1.2 1.4 0.7 1.0
40 2.8 0.4 0.3 0.8 0.7 0.8 0.8 0.9 2.0 0.6 1.3
60 4.1 0.3 0.3 0.7 0.6 0.6 0.6 0.4 1.5 1.1
80 5.5 0.4 0.3 0.6 0.5 0.4 0.7 0.3 1.8
100 6.9 0.3 0.3 0.7 0.4 0.5 0.9 0.2
125 8.6 0.3 0.3 0.4 0.4 0.6 0.7
150 10.3 0.3 0.3 0.3 0.7
175 12.1 0.3 0.3 0.3 0.6
200 13.8 0.2 0.3 0.2 0.7
- Shaded areas indicate where maximum operating inlet pressure for a given orice size is exceeded.
- continued -
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