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Model
Nominal size
Application
Maximum
Pressure
Max. temperature
Temperature
adjusting range
Ambient temperature
Body
Valve, Valve seat
Valve spindle
Material
Bellows
Thermal
bulb
Standard capillary length
Connection
･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
Temperature adjusting range（℃）
For liquid
40-60
50-70
60-80
80-100
100-120
The heat resistance temperature is the
temperature calculated taking the pressure
resistance of the bellows into consideration.
3．3 Temperature accuracy from set point
As below, depending on capillary length
Standard
capillary length
2m
2-3.5m
3.5-5m
･If the preset temperature is higher than 100°C, add ±1.0°C.
Heating
Heated
Body
Thermal bulb
For liquid
For air
Set temperature -10℃ or less Set temperature +30℃ or less
For liquid
For air
Withstand
temperature
For air
40-60
50-70
60-80
80-100
100-120
OB-3･4
For liquid
For air
±
2℃
±
±
2.5℃
±
３℃
±
±
OB-4
15-150A
Cold water, Refrigerant
Cold and hot water, Oil, Non-dangerous fluid
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
1.0MPa
180 ℃
40-120 ℃
Cast iron
Phosphor bronze (stainless steel)
Stainless steel
Phosphor bronze
Stainless steel
Stainless steel
15-80A：2m 100-150A：3m
JIS 10K FF flange
OB-3G,4G
Temperature adjusting range（℃） Withstand
For liquid
(℃)
70
15-35
80
20-40
90
35-55
110
40-60
130
50-70
60-80
70-90
80-100
For liquid, For air
3℃
3.5℃
4℃
2
OB-4G
15-125A
15-100 ℃
For air
15-35
20-40
35-55
40-60
50-70
60-80
70-90
80-100
OB-3G･4G
±
3.5℃
±
4℃
±
4.5℃
temperature
(℃)
50
50
70
90
100
110
120
130
■EPDT-258a■
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