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Installation for Steam Service
Installation for Air Service
This bulletin should be used by experienced personnel as a guide to the installation of the Model GD-30 and GD-30S
Pressure Reducing Valve. Selection or installation of equipment should always be accompanied by competent technical
assistance. You are encouraged to contact Armstrong International, Inc. or its local representative for additional
information.
1. An Armstrong Inverted Bucket Steam Trap is
recommended to drain condensate at the inlet of the
Pressure Reducing Valve (PRV). A Liquid Drainer is
recommended for air service.
2. An Armstrong Y-Strainer (20-100 mesh, depending on
system dirt) should be installed before the PRV to
reduce the chance of dirt fouling.
3. Pressure gauges should be installed before and after
the PRV.
Model GD-30, GD-30S
Pressure Reducing Valve
Installation and Maintenance Instructions
Installation Instructions
4. If system cannot be turned off to service PRV then
piping a by-pass line with a high quality globe valve
around the PRV will allow manual system operation
while the PRV is being serviced.
5. Do not install quick opening or closing valves down-
stream of the PRV.
6. Install the PRV with the flow in the direction of the
arrow on the body.
Bulletin No. AY-764-B
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Summary of Contents for Armstrong-Yoshitake, Inc. GD-30
- Page 1 Installation for Steam Service Installation for Air Service This bulletin should be used by experienced personnel as a guide to the installation of the Model GD-30 and GD-30S Pressure Reducing Valve. Selection or installation of equipment should always be accompanied by competent technical assistance.
- Page 2 Start-Up and Adjustment Procedures Improper adjustment of the pressure reducing valve may cause hunting, scale problems, water hammer, etc., and damage to the valve itself. Damaged pressure gauges, leakage or opening of a bypass valve, or clogging of an inlet strainer may cause problems similar to that of a malfunctioning reducing valve.
- Page 3 GD-30 1/2” - 1” Disassembly Reassembly 1. Eliminate pressure from inside the valve. Make 1. Check all parts to make sure they are in good sure the valve is completely free from pressure. condition before putting back together. 2. Pull up and turn the handle (4) in the direction 2.
- Page 4 GD-30 1-1/2 - 2” Disassembly Reassembly 1. Eliminate pressure from inside the valve. Make 1. Check all parts to make sure they are in good sure the valve is completely free from pressure. condition before putting back together. 2. Pull up and turn the handle (22) in the direction 2.
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