EPDT-255b
MODEL GD-21
Differential Pressure Regulating 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
4. Dimensions and Weight ·············································· 2
5. Operation ································································· 3
6. Nominal Size Selection ··············································· 4
6.1 Nominal sizes selection chart ·································· 4
6.2 Calculation formula for Cv value ······························ 4
7. Installation ································································ 5
7.1 Precautions for installation ····································· 5
7.2 Piping example ···················································· 6
8. Operating Procedure ·················································· 7
8.1 Precautions for operation ······································· 7
8.2 Precautions for air vent ········································· 7
8.3 How to use air vent ··············································· 7
9. Maintenance ····························································· 7
9.1 Precautions for disassembly and maintenance ··········· 7
9.2 Disassembly ······················································· 8
9.3 Reassembly ························································ 8
9.4 Precautions for reassembly ···································· 9
10. Troubleshooting ······················································· 9
11. Exploded Drawing ··················································· 10
Warranty Information