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EPDT-023c
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Model GD-20R
Primary Pressure Regulating Valve
Pressure Sustaining Valve
Please read this bulletin thoroughly before using the pressure reducing valve, so that you
may do so correctly and safely. Please carefully store this bulletin in a handy place.
――――――The following safety symbols are used in this manual. ―――――
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.
Contents
1. Specifications & Performance
1.1 Specifications ··········································································· 1
1.2 Flow Rate Characteristics Chart ····················································· 2
2. Dimensions & Weight ····································································· 2
3. Operation ····················································································· 4
4. Nominal Size Selection Method
4.1 Nominal Size Selection Chart ························································· 5
4.2 Selection Formula for Nominal Size ················································· 7
4.3
Pressure Sustaining Valve Selection ················································ 8
5. Installation
5.1 Example of Piping ······································································· 9
5.2
Precautions before Operation ························································ 11
6. Operating Procedure
6.1 Precautions for Operation ··························································· 12
6.2 Adjustment Procedure ································································ 13
7. Maintenance Procedure
7.1 Troubleshooting ········································································ 14
7.2 Precautions for Maintenance ························································ 15
7.3 Periodic Inspection ···································································· 15
7.4 Disassembly ············································································· 15
7.5 Assembly ·················································································· 16
8 Exploded Drawing ··········································································· 17
After Sales Service
