Yoshitake OB-2G is a direct acting temperature regulator that ensures distinguished temperature resistance due to an external pressure type bellows. It is designed for heating applications using steam or hot water to heat cold/hot water, oil, and other non-dangerous fluids. The double valve structure offers a larger flow rate than a single valve type.

Features

• No need for an adjusting tool due to the attached adjusting handle, making adjustment easy.
• Double valve structure offers larger flow rate than a single valve type.
• Excellent accuracy since special packing is used for spindle gland packing which affects opening/closing operation of the valve.
• The OB-2G ensures distinguished temperature resistance due to an external pressure type bellows.

Specifications

Model	OB-2	OB-2G
Application	Heating	Steam, Hot water
Heated fluid	Cold and hot water, Oil, Non-dangerous fluids	Cold and hot water, Oil, Non-dangerous fluids
Maximum pressure (Body)	15A-40A: 0.7 MPa [1.0 MPa] 50A: 0.5 MPa [0.7 MPa] 65A: 0.5 MPa [0.7 MPa] 80A: 0.4 MPa [0.5 MPa] 100A: 0.4 MPa 125A: 0.35 MPa 150A: 0.2 MPa	15A-40A: 0.7 MPa [1.0 MPa] 50A: 0.5 MPa [0.7 MPa] 65A: 0.5 MPa [0.7 MPa] 80A: 0.4 MPa [0.5 MPa] 100A: 0.4 MPa 125A: 0.2 MPa
Maximum pressure (Thermal bulb)	1.0 MPa	1.0 MPa
Max. withstand temperature	180°C	180°C
Temperature adjusting range (For liquid)	40-120°C	15-100°C
Temperature adjusting range (For air)	40-120°C	15-100°C
Ambient temperature	Set temperature -10°C or less	Set temperature +30°C or less
Material (Body)	Cast iron	Cast iron
Material (Valve, valve seat)	Bronze (stainless steel)	Bronze (stainless steel)
Material (Valve spindle)	Stainless steel	Stainless steel
Material (Bellows)	Phosphor Bronze	Phosphor Bronze
Material (Thermal bulb)	Stainless steel	Stainless steel
Standard capillary length	15A-80A: 2 m 100A-150A: 3 m	15A-80A: 2 m 100A-125A: 3 m
Connection	JIS 10K FF flanged	JIS 10K FF flanged

Notes

• Valve seat leakage: Refer to manufacturer documentation.
• If the ambient temperature is higher than the set temperature or less than 40°C, use the OB-2G (with external pressure type bellows).
• If using at a pressure higher than 0.5 MPa, stainless steel trim parts are recommended.
• Available with capillary of up to 5 meters.
• 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.
• Available with temperature adjusting range of 30°C (For OB-2 only).

Temperature Adjusting Range

OB-2G

Temperature adjusting (°C) (For liquid)	Temperature adjusting (°C) (For air)	Withstand temperature (°C)
15-35	15-35	50
20-40	20-40	50
35-55	35-55	70
40-60	40-60	90
50-70	50-70	100
60-80	60-80	110
70-90	70-90	120
80-100	80-100	130

Note

The term "withstand temperature" means the temperature from pressure resistance of the bellows.

OB-2

Temperature adjusting (°C) (For liquid)	Temperature adjusting (°C) (For air)	Withstand temperature (°C)
40-60	40-60	70
50-70	50-70	80
60-80	60-80	90
80-100	80-100	110
100-120	100-120	130

Dimensions and Weights

Nominal size	L (mm)	H1 (mm)	H (mm)	Weight (kg)
15A	126	60	520	15
20A	130	60	520	16
25A	140	70	540	18
32A	150	75	550	21
40A	160	75	550	23
50A	180	110	620	29
65A	215	125	650	38
80A	260	135	670	48
100A	300	160	750	58
125A	360	190	810	76
150A (OB-2 only)	382	220	980	-

Note

The OB-2G comes in nominal size up to 125A.

Nominal Size Selection Chart (For Steam)

How to use the chart

When selecting the nominal size of a temperature regulator whose inlet pressure (P1), outlet pressure (P2), and steam flow rate are 0.3 MPa, 0.25 MPa, and 60 kg/h, respectively, first find intersection point (a) of the inlet pressure of 0.3 MPa and the outlet pressure of 0.25 MPa. Trace down vertically from this intersection point (a) to find intersection point (b) with the flow rate of 60 kg/h.

Since this intersection point (b) lies between nominal sizes 15A or 20A and 25A, select the larger one, 25A.

Note

Chart of the flow rate is a reference value.