2
■
EPDT-258b
■
2.2
Temperature adjusting range
OB-3,4
OB-3G,4G
Temperature adjusting range
（℃）
Withstand
temperature
(
℃
)
Temperature adjusting range
（℃）
Withstand
temperature
(
℃
)
For liquid
For air
For liquid
For air
40-60
40-60
70
15-35
15-35
50
50-70
50-70
80
20-40
20-40
50
60-80
60-80
90
35-55
35-55
70
80-100
80-100
110
40-60
40-60
90
100-120
100-120
130
50-70
50-70
100
The term “Withstand temperature” means the
temperature from pressure resistance of the bellows.
60-80
60-80
110
70-90
70-90
120
80-100
80-100
130
2.3
Temperature accuracy from set point
As below, depending on capillary length
Standard
capillary length
OB-3
･
4
OB-3G
･
4G
For liquid
For air
For liquid, For air
2m
±
2
℃
±
3
℃
±
3.5
℃
2-3.5m
±
2.5
℃
±
3.5
℃
±
4
℃
3.5-5m
±
３℃
±
4
℃
±
4.5
℃
･
If the preset temperature is higher than 100
°
C, add
±
1.0
°
C.
･
The preset temperature error is the maximum temperature width ranging from the time when the valve
closes until the time when the valve starts to open, not the value expressing the control width.
2.4
Cv value table
Nominal size 15A
20A
25A
32A
40A
50A
65A
80A
100A 125A 150A
OB-3
･
3G
2
2
4
7
10
―
―
―
―
―
―
OB-4
2
2
4
7
10
14
21
27
42
72
94
OB-4G
2
2
4
7
10
14
21
27
42
72
―
2.5
Valve Seat Leakage
Unit
：
steam (kg/h),water (L/h)
Nominal size
15A
20A
25A
32A
40A
50A
65A
80A
100A 125A 150A
OB-3
･
3G
1.5
1.5
1.8
2.4
3.0
―
―
―
―
―
―
OB-4
1.5
1.5
1.8
2.4
3.0
3.6
4.8
6.0
7.2
9.0
10.8
OB-4G
1.5
1.5
1.8
2.4
3.0
3.6
4.8
6.0
7.2
9.0
―
･
The values in the table above are max. Valve seat leakage is measured under the condition of
0.5MPa or max.pressure. at the temperature of “set temperature-5˚C” for cooling.