INSTALLATION AND MAINTENANCE INSTRUCTIONS

IMI 3.025

April 1998

D Series Noise Diffuser

Description

The D Series noise diffuser is designed to reduce pressure reducing valve noise generation. The diffuser breaks up normal exit turbulence of the steam flow using an engineered orifice pattern in a pipe nozzle inserted on the downstream side of a pressure reducing valve.

Warning!

Before proceeding with installation, ensure that stop valves have been closed and steam supply has been shut-off.

1. Before installing the pressure reducing valve, ensure the piping is free from foreign material, scale, etc.

2. Install the pressure reducing valve in accordance with the instructions supplied with the valve.

3. Connect the inlet of the noise diffuser directly to the outlet connection of the pressure reducing valve to avoid the generation of flanking noise.

Steam

Supply

Moisture

Separator

Strainer

Strainer

Check

Valve

Float &

Thermostatic

Steam Trap

Pilot

Operated

Pressure

Control

Valve

Noise Diffuser

(if required)

Inlet

Outlet

D Series Noise Diffuser

4. Provide a length of at least 10 pipe diameters of pipe equal to the nominal size of the diffuser outlet. If desired, piping may then be reduced to a smaller size as long as flow velocity will not exceed 6,000 feet per minute.

5. Ensure that piping is adequately supported to avoid imposing stress on the valve body or the diffuser.

6. The typical hook-up shown below will aid in planning a correct installation.

Safety

Valve

Drip

Pan

Elbow

Reduced

Steam

Pressure

Ten Pipe

Diameters

Strainer

Strainer

Float &

Thermostatic

Steam Trap

Check

Valve

Check

Valve

Spirax Sarco Applications Engineering Department

Toll Free at: 1-800-833-3246

SPIRAX SARCO, INC. • 1150 NORTHPOINT BLVD. • BLYTHEWOOD, SC 29016

PHONE 803-714-2000 • FAX 803-714-2200