Spirax Sarco Noise Attenuator Diffuser, Series: D Series, 4 in MNPT x 12 in ANSI 300 Flange, Carbon Steel

The D Series Noise Diffuser is designed to reduce Pressure Reducing Valve noise generation. The diffuser breaks up the 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. The amount of noise level reduction produced by the diffuser will be approximately 15 dBA. Pressure drop through the diffuser will not exceed 1% of line pressure upstream of the pressure reducing valve.