Yoshitake OB-3 Manual de usuario

■EPDT-258a■

MODEL OB-3,4,3G,4G

TEMPERATURE REGULATOR VALVE

PRODUCT MANUAL

Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the

product, please read this manual before use. This manual shall be kept with care for future references.

The symbols used in this manual have the following meanings.

Warning

This symbol indicates a potentially hazardous situation that, if not avoided,

could result in death or serious injury.

Caution

This symbol indicates a hazardous situation that, if not avoided, may result in

minor or moderate injury or may result in only property damage.

Table of Contents

1. Usage of the Product·················································· 1

2. Features ·································································· 1

3. Specifications··························································1-3

3.1 Specifications ························································ 2

3.2

Temperature adjusting range

······································ 2

3.3 Temperature accuracy from set point ······················2-3

3.4 Cv value table························································ 3

3.5

Valve Seat Leakage

················································· 3

4. Dimensions and Weight ············································4-6

Structure

·······························································7-9

Nominal Size Selection Chart

··································· 10-11

Maintenance and Inspection

·········································12

7.1

Cautions before use

···············································12

7.2

Installation of Main Unit

············································12

7.3 Installation of Thermal Tube

·······································13

7.4

Warnings and Cautions for Use

··································13

7.5

Adjustment Procedures

············································14

7.6

Example of piping

···················································14

7.7

Trouble and Corrective Actions

···································15

7.8 Precautions during maintenance and inspection···········16

7.9

How to Disassemble

················································16

Handling of Protection Pipe (Option)

························· 17-18

Warranty Information

■EPDT-258a■

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. Features

(1) As each of the products is equipped with an adjustment handle, additional tools are not necessary and the

adjustment is easy.

(2) As each of the products has multiple valves, its flow rate is larger than that of single valve types.

(3) As special packing is used as gland packing for valve shafts which affects the opening and closing of valves,

the accuracy is excellent.

(4) As the OB-3G and OB-4G types have adopted external pressure bellows, their heat resistance is excellent.

3. Specifications

3.1 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 temperature +30℃or less

Material

Body Cast bronze

Valve, Valve seat Phosphor 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)

■EPDT-258a■

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 temperature +30℃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.

■EPDT-258a■

･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.

3.4 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 ―

3.5 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 leakage amount mentioned above is the maximum leakage amount measured when

■EPDT-258a■

4. Dimensions and Weight

OB-3 (15-40A)

OB-3G (15-40A)

(mm)

Nominal size

R l

Standard

15A-40A 2000

440

Nominal

size d L H１

H B Weight

(kg)

15A Rc 1/2 148

510

160 11

20A Rc 3/4 148

510

160 11

25A Rc 1 160

520

160 12

32A Rc1 1/4

195

520

160 12

40A Rc1 1/2

210

530

160 13

For liquid

For air

For liquid

For air

■EPDT-258a■

For liquid

For air

For liquid

For air

OB-4 (15-40A)

OB-4G (15-40A)

(mm)

Nominal size

L H１

H B Weight(kg)

15A 126

520

160

20A 130

520

160 16

25A 140

540

160 18

32A 150

550

160 21

40A 160

550

160 23

(mm)

Nominal size

R l

Standard 15A-40A 2000

440

■EPDT-258a■

For liquid

For air

For liquid

For air

OB-4 (50-150A)

OB-4G (50-125A)

(mm)

Nominal

size ＬＨ１ＨＢWeight(kg)

OB-4

OB-4G

OB-4

OB-4G

OB-4

OB-4G

OB-4

OB-4G

OB-4

OB-4G

50A 180 110 620 160 29

65A 215 125 650 160 38

80A 260 135 670 160 48

100A 300 160 750 180 58

125A 360 190 810 180 76

150A 382

－220

－980

－220

－125

－

(mm)

Nominal size Ｒｌ

Standard

50-80A 2000

440

100-150A *1 3000

440

*1:The OB-4G comes in nominal size up to 125A.

■EPDT-258a■

5. Structure

No.

Material

Body

Bottom Cover

Union Nipple

Union Nut

Valve

Top Cover

Gland Packing

Spring

Nut

Cap Nut

Valve Stem

Frame

Lock Nut

Handle

Division Plate

Bearing Cover

Bearing

Adjusting Screw

Spring

Spindle

Bellows

Washer of Bellows

Spring Plate

Bellows Cover

Bellows Washer

Bellows Nut

Guard Metrl Fitting

Flexible Tube

Flexible

Thermal Element Pipe

Screw Flange

Thermal Element Flange

Thermal Element Cap

Bolt

Gasket

Fin

For liquid

For air

For liquid

For air

OB-3 (15-40A)

OB-3G (15-40A)

Internal structure is rather different

depending on nominal size.

For liquid

For air

Internal structure is rather different

depending on nominal size.

OB-3G (15-40A)

■EPDT-258a■

No.

Material

Body

Bottom Cover

Top Valve Seat

Under Valve Seat

Valve

Spindle Joint

Gasket

Top Cover

Gland Packing

Spring

Nut

Cap Nut

Valve Stem

Frame

Lock Nut

Handle

Division Plate

Bearing Cover

Bearing

Adjusting Screw

Spring

Spindle

Bellows

Washer of Bellows

Spring Plate

Bellows Cover

Bellows Washer

Bellows Nut

Guard Metrl Fitting

Flexible Tube

Flexible

Thermal Element Pipe

Screw Flange

Thermal Element Flange

Thermal Element Cap

Bolt

Gasket

Fin

For liquid

For air

For liquid

For air

OB-4 (15-40A)

OB-4G (15-40A)

Internal structure is rather different

depending on nominal size.

Internal structure is rather different

depending on nominal size.

■EPDT-258a■

No.

Material

Body

Bottom Cover

Top Valve Seat

Under Valve Seat

Valve

Spindle Joint

Gasket

Top Cover

Screw

Gland Packing

Spring

Nut

Cap Nut

Valve Stem

Frame

Lock Nut

Handle

Division Plate

Bearing Cover

Bearing

Adjusting Screw

Spring

Spindle

Bellows

Washer of Bellows

Spring Plate

Bellows Cover

Bellows Washer

Bellows Nut

Guard Metrl Fitting

Flexible Tube

Flexible

Thermal Element Pipe

Screw Flange

Thermal Element Flange

Thermal Element Cap

Bolt

Gasket

Fin

For liquid

For air

OB-4G (50-150A)

OB-4G (50-125A)

For liquid

For air

Internal structure is rather different

depending on nominal size.

Internal structure is rather different

depending on nominal size.

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