Data Sheet
Cavitrol III Trims
D100196X012
Product Bulletin
80.2:030
March 2012
6
Table 2. Valve Travels and Flow Coefficients (Cav itrol III One-Stage Trim)
VALVE
RATING
AND
DESIGN
VALVE
SIZE, NPS
STANDARD
OPTIONAL FOR DESIGN ET AND EWT
DUE TO OVERTRAVEL
F
L
at
Maximum
Travel
Travel
Min
(1)
C
v
Max
C
v
Maximum Travel
Max C
v
(2)
mm Inch mm Inch
CL125
through
600
ET
1
1-1/2
2
2-1/2
19
19
29
38
0.75
0.75
1.125
1.5
1.9
2.5
3.9
4.2
12.2
19.4
36.1
64.4
25
22
---
---
1
0.875
---
---
15.5
22.5
---
---
0.90
0.93
0.93
0.91
3
4
6
8
38
51
51
76
1.5
2
2
3
4.6
5.2
10
15
81.5
148
238
408
41
54
57
86
1.625
2.125
2.25
3.375
86.7
151
259
439
0.89
0.90
0.91
0.94
CL600
EWT
4x2
6x4
8x4
29
51
51
1.125
2
2
3.9
5.2
5.2
43.6
162
165
---
54
54
---
2.125
2.125
---
169
171
0.91
0.95
0.95
8x6
12x6
10x8
12x8
51
51
76
76
2
2
3
3
10
10
15
15
267
280
418
433
57
57
76
86
2.25
2.25
3.375
3.375
293
305
455
487
0.93
0.93
0.92
0.90
CL150
through 600
EUT-2
16
203 8 46 1790 --- --- --- 0.91
276 10.88 46 2120 --- --- --- 0.91
CL150
through 600
EWT-2
20x16
276 10.88 46 2390 --- --- --- 0.91
378 14.88 46 2800 --- --- --- 0.91
24x16
276 10.88 46 2390 --- --- --- 0.91
378 14.88 46 2800 --- --- --- 0.91
429 16.88 46 2940 --- --- --- 0.91
24x20
276 10.88 56 3160 --- --- --- 0.91
378 14.88 56 3810 --- --- --- 0.91
429 16.88 56 4050 --- --- --- 0.91
CL150
through 600
Large ET
12 203 8 40 1160 --- --- --- 0.91
14 203 8 40 1262 --- --- --- 0.91
16 203 8 40 1330 --- --- --- 0.91
1. Valves should not be required to throttle at a Cv less than the minimum Cv for an extended period of time. Erosion damage to the valve seats may result.
2. Minimum Cv for the Optional category is the same as the minimum Cv in the Standard category.
Figure 4. Required Seat Force for Class IV and V Shutoff Classification
NOTE: CLASS IV SHUTOFF IS FOR CAVITROL III ONE-STAGE TRIM ONLY
900
800
700
600
500
400
300
200
100
0
0 1000 2000 3000 4000 5000 6000
SHUTOFF PRESSURE DROP, PSI
REQUIRED SEAT LOAD (LB PER LINEAL INCH)
A2222-6
CLASS V
CLASS IV
SHUTOFF PRESSURE DROP,BAR
REQUIRED SEAT LOAD (N PER LINEAL mm)
0 50 100 150 200 250 300 350 400
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
1000
CLASS V (METAL SEAT FOR OPTIMUM
PERFORMANCE AND LIFE IN BOILER
FEEDWATER SERVICE.
170
160