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Yoshitake OB-3 Quick Start Manual

Temperature regulator valve
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TEMPERATURE REGULATOR VALVE
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
Caution
1. Usage of the Product ·················································· 1
2. Specifications ·························································· 1-2
2.1 Specifications ························································ 1
2.2 Temperature adjusting range ······································ 2
2.3 Temperature accuracy from set point ························ 2
2.4 Cv value table ························································ 2
2.5 Valve Seat Leakage ················································· 2
3. Dimensions and Weight ············································ 3-4
4. Nominal Size Selection Chart ······································· 5-6
5. Maintenance and Inspection ······································· 7-10
5.1 Cautions before use ················································ 7
5.2 Installation of Main Unit ············································· 7
5 .3 Installation of Thermal bulb ········································· 8
5.4 Warnings and Cautions for Use ··································· 8
5.5 Adjustment Procedures ············································· 9
5.6 Example of piping ···················································· 9
5.7 Trouble and Corrective Actions ··································· 10
5.9 How to Disassemble ················································ 10
6. Handling of Protection Pipe (Option) ························· 11-12
MODEL OB-3,4,3G,4G
PRODUCT MANUAL
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.

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  • Page 1: Table Of Contents

    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.

  • Page 2: Usage Of The Product

    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...

  • Page 3: Temperature Adjusting Range

    2.2 Temperature adjusting range OB-3,4 OB-3G,4G Withstand Withstand Temperature adjusting range（℃） Temperature adjusting range（℃） temperature temperature For liquid For air For liquid For air (℃) (℃) 40-60 40-60 15-35 15-35 50-70 50-70 20-40 20-40 60-80 60-80 35-55 35-55 80-100 80-100...

  • Page 4: Dimensions And Weight

    3. Dimensions and Weight For liquid For air OB-3・3G OB-3G has a little difference in bellows structure. (mm) Nominal Weight １ size (kg) Rc 1/2 Rc 3/4 Rc 1 Rc1 1/4 Rc1 1/2 (mm) Nominal size Standard 15A-40A 2000 ■EPDT-258b■...
  • Page 5 For liquid For air OB-4・4G OB-4G has a little difference in bellows structure. (mm) Nominal size Weight(kg) １ 180 110 620 215 125 650 260 135 670 100A 300 160 750 125A 360 190 810 150A *1 382 220 980 (mm) Nominal size 50-80A...

  • Page 6: Nominal Size Selection Chart

    4. Nominal Size Selection Chart ● OB-3･3G (For Water) Nominal size ΔP: Differential pressure MPa How to use chart When selecting the nominal size of a temperature regulator whose inlet pressure (P1), outlet (P2), and steam flow rate are 0.3MPa, 0.15MPa, 9 m3/h, respectively, first find intersection point (a) of the differential pressure = 0.15MPa (0.3MPa-0.15MPa) and the flow rate = 9 m3/h.
  • Page 7 ● OB-4･4G (For Water) Nominal size ΔP: Differential pressure MPa How to use chart When selecting the nominal size of a temperature regulator whose inlet pressure (P1), outlet (P2), and steam flow rate are 0.3MPa, 0.15MPa, 9 m3/h, respectively, first find intersection point (a) of the differential pressure = 0.15MPa (0.3MPa-0.15MPa) and the flow rate = 9 m3/h.

  • Page 8: Maintenance And Inspection

    5. Maintenance and Inspection Cautions before use Caution (1) Do not disassemble the product without reason. * If you disassemble the product for no reason, the original performance of the product is not achieved. (2) When plumbing the product, make sure to remove foreign substances, scale, etc. from the pipes. * If foreign substances, scale, etc.

  • Page 9: Installation Of Thermal Bulb

    5.3 Installation of Thermal bulb (1) Avoid bending the capillary tube at a sharp angle, twisting or pulling it with force. Secure the capillary tube not to allow it touch steam piping or any other of high temperature.The bend radius of the capillary tube should be more than 40 mm.

  • Page 10: Adjustment Procedures

    5.5 Adjustment Procedures Incorrect adjustment may cause hunting, scale problems or water hammer, and may heavily damage the main parts of the product. Be sure to follow the steps below. (1) Close the stop valves at the front and the rear of the product. Open the bypass stop valve and blow fluid through the bypass line with enough time.

  • Page 11: Trouble And Corrective Actions

    5. 7 Trouble and Corrective Actions Trouble Cause Remedy 1. Inadequate adjustment. 1. Readjust according to the adjustment procedures. 2. Nominal size of the product is too 2. Replace the product with one small for the specifications of the of proper nominal size. system.

  • Page 12: Handling Of Protection Pipe (Option)

    6. Handling of Protection Pipe (Option) 6.1. A set of protection pipes 6.2 Insert a gasket into the protection pipe. 6.3 Insert a thermal bulb into the protection pipe and screw in a screwing joint. ■EPDT-258b■...
  • Page 13 6.4 Fasten the joint nut with a wrench or spanner. 6.5 Inject liquid which is the same as the liquid to be heated from the plug hole on the screwing joint side. 6.6 Attach the plug after injection. ■EPDT-258b■...

  • Page 14: Warranty Information

    Fire, flood, earthquake, thunder and other natural disasters. Consumable parts such as O-ring, gasket, diaphragm and etc. Yoshitake is not liable for any damage or loss caused by malfunction or defect of the product. INTERNATIONAL DEPT. 955-5, Miyamae, Irukadeshinden, Komaki, Aichi, 485-0084, Japan...

This manual is also suitable for:

Ob-4Ob-3gOb-4g

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