■
EPDT-258a
■
2
Model
OB-4
OB-4G
Nominal size
15-150A
15-125A
Application
Heating
Cold water, Refrigerant
Heated
Cold and hot water, Oil, Non-dangerous fluid
Maximum
Pressure
Body
15-40A:0.7MPa [1.0MPa]
50A:0.5MPa [0.7MPa]
65A:0.5MPa [0.7MPa]
80A:0.4MPa [0.5MPa]
100A:0.4MPa
125A:0.2MPa [0.35MPa for OB-4]
150A:0.2MPa
Thermal bulb
1.0MPa
Max. temperature
180
℃
Temperature
adjusting range
For liquid
40-120
℃
15-100
℃
For air
Ambient temperature
Set temperature -10
℃
or less Set tempe30
℃
or less
Material
Body
Cast iron
Valve, Valve seat
Phosphor bronze (stainless steel)
Valve spindle
Stainless steel
Bellows
Phosphor bronze
Thermal
bulb
For liquid
Stainless steel
For air
Stainless steel
Standard capillary length
15-80A
：
2m
100-150A
：
3m
Connection
JIS 10K FF flange
･
If the ambient temperature is higher than the set temperature or less than 40
℃
, use the OB-4G
(with external pressure type bellows).
・
If using at a pressure higher than 0.5 MPa, with stainless steel trim parts is recommended.
･
Available with capillary of up to 5 meter.
・
Available with Max. temperature inside [ ] (Valve and valve seat material, and bellows is
different from standard type).
・
Available with thermal well (SUS304 made or with a PTFE cap) for liquid.
3.2
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 heat resistance temperature is the
temperature calculated taking the pressure
resistance of the bellows into consideration.
60-80
60-80
110
70-90
70-90
120
80-100
80-100
130
3
．
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.