Yoshitake OB-3, Quick Start Manual, Page: 2 / 14

1
■
EPDT-258b
■
1. Usage of the Product
The automatic temperature adjustment valves, OB-3, OB-3G, OB-4 and OB-4G, are used in the systems for
ocean vessels, industrial plants, air conditioning equipment, chemical industry, etc. for adjusting the cooling
temperature.
2. Specifications
2.1 Specifications
Model OB-3 OB-3G
Nominal size 15-40A
Application
Heating Cold water, Refrigerant
Heated Cold and hot water, Oil, Non-dangerous fluid
Maximum
Pressure
Body 0.7MPa
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 bronze
Valve, Valve seat bronze
Valve spindle Stainless steel
Bellows Phosphor bronze
Thermal
bulb
For liquid Stainless steel
For air Stainless steel
Standard capillary length 2m
Connection JIS Rc screwed (union joint)
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 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. pressure 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.