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Yoshitake OB-3 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. 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
5. Structure ······························································· 7-9
6. Nominal Size Selection Chart ··································· 10-11
7. 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
7.9 How to Disassemble ················································ 16
8 Handling of Protection Pipe (Option) ························· 17-18
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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■EPDT-258a■

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

  • Page 3: Specifications

    ・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 Withstand Temperature adjusting range（℃） Withstand Temperature adjusting range（℃）...

  • Page 4: Cv Value Table

    3.4 Cv value table Nominal size 100A 125A 150A ― ― ― ― ― ― OB-3･3G OB-4 OB-4G ― 3.5 Valve Seat Leakage Unit：steam (kg/h),water (L/h) Nominal size 100A 125A 150A ― ―...

  • Page 5: Dimensions And Weight

    4. Dimensions and Weight For liquid For air OB-3 (15-40A) For liquid For air OB-3G (15-40A) (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-258a■...
  • Page 6 For liquid For air OB-4 (15-40A) For liquid For air OB-4G (15-40A) (mm) Nominal size Weight(kg) １ (mm) Nominal size Standard 15A-40A 2000 ■EPDT-258a■...
  • Page 7 For liquid For air OB-4 (50-150A) For liquid For air OB-4G (50-125A) (mm) Ｌ Ｈ Ｈ Ｂ Weight(kg) Nominal １ size OB-4 OB-4G OB-4 OB-4G OB-4 OB-4G OB-4 OB-4G OB-4 OB-4G 100A 125A － － － － － 150A (mm) Ｒ...

  • Page 8: Structure

    For air 18 Division Plate 19 Bearing Cover Internal structure is rather different depending on nominal size. 20 Bearing 21 Adjusting Screw OB-3 (15-40A) 22 Spring 23 Spindle 24 Bellows 25 Washer of Bellows 26 Spring Plate 27 Bellows Cover...
  • Page 9 Material 1 Body 2 Bottom Cover 3 Top Valve Seat 4 Under Valve Seat 5 Valve 6 Spindle Joint 7 Gasket 9 Top Cover 10 Gland Packing 11 Spring 12 Nut 13 Cap Nut 14 Valve Stem 15 Frame 16 Lock Nut 17 Handle 18 Division Plate 19 Bearing Cover...
  • Page 10 Material 1 Body 2 Bottom Cover 3 Top Valve Seat 4 Under Valve Seat 5 Valve 6 Spindle Joint 7 Gasket 8 Top Cover 9 Screw 10 Gland Packing 11 Spring 12 Nut 13 Cap Nut 14 Valve Stem 15 Frame 16 Lock Nut 17 Handle For liquid...

  • Page 11: Nominal Size Selection Chart

    6. Nominal Size Selection Chart ● OB-3･3G (For Water) Nominal size ∆P: 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 12 ● OB-4･4G (For Water) Nominal size ∆P: 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 13: Maintenance And Inspection

    7. 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 14: Installation Of Thermal Tube

    7.3 Installation of Thermal Tube (1) Do not bend the lead pipe at an acute angle, nor twist it or make it entangled. Fix it in a way that keeps it from contacting the steam pipe or a high temperature place. (2) Place the thermal tube in a way that makes three fourths of its total length come into contact with the fluid to be heated.

  • Page 15: Adjustment Procedures

    7.5 Adjustment Procedures If you adjust the product in a wrong way, hunting scale trouble, water hammer, etc. may occur or critical parts of the product may be seriously damaged or, in some cases, destroyed. Therefore, make sure to follow the procedures below and adjust correctly.

  • Page 16: Trouble And Corrective Actions

    7. 7 Trouble and Corrective Actions Phenomena Causes Measures and Actions 1. The adjustment is not correct. 1. Adjust again following the adjustment procedures. 2. The nominal diameter is too 2. Change the diameter to small compared with correct nominal diameter. specifications.

  • Page 17: Precautions During Maintenance And Inspection

    Precautions during maintenance and inspection Warning (1) When using a hot fluid, do not touch the product by bare hand. *Doing so may scald your skin. (2) After aerating, do not retighten gasket. * Doing so may break the gasket, possibly resulting in external leak. Warning (1) Do not disassemble the bellows when the thermal tube is heated.

  • Page 18: Handling Of Protection Pipe (Option)

    8. Handling of Protection Pipe (Option) 8.1. A set of protection pipes 8.2 Insert a gasket into the protection pipe. 8.3 Insert a liquid tube into the protection pipe and screw in a screwing joint. ■EPDT-258a■...
  • Page 19 8.4 Fasten the joint nut with a wrench or spanner. 8.5 Inject liquid which is the same as the liquid to be heated from the plug hole on the screwing joint side. 8.6 Attach the plug after injection. ■EPDT-258a■...

  • Page 20: 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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