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EPDT-258a
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MODEL
OB-3,4,3G,4G
TEMPERATURE REGULATOR VALVE
PRODUCT MANUAL
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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
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
7.8 Precautions during maintenance and inspection ··········· 16
7.9
How to Disassemble
················································ 16
8
Handling of Protection Pipe (Option)
························· 17-18
Warranty Information