I Since 1986 Manufacturers Of Steam Fired Specialty Equipment ncorporated E ngineering r P.O. Box 473639, Charlotte, NC 28247 | Phone 704.940.1228 | Fax 704.940.1227 | www.thermafloengineering.com NOISE ATTENUATORS : SERIES D TYPE D ORIFICE PLATE for Pressure Regulating Valves Noise Attenuation Equipment is used to reduce unwanted or excessive noise that commonly occurs in pressure reducing stations. TYPE D DIMENSION (A) – inches Pipe Size 150# Flange 300# Flange 2” 6 4 3 /16 2 1 /2” 7 4 15 /16 3” 7 1 /2 5 11 /16 4” 9 6 15 /16 6” 11 9 11 /16 Note: Other sizes available. Consult factory. TYPE D Dimensions TYPE D ORIFICE PLATE Series 3010 Steam Pressure Reducing Valve Sensing Line For Regulator TYPE D Typical Hook-up TYPE D ORIFICE PLATE 304 Stainless Steel Construction Noise Reduction Capability: 10 dBA HOW IT WORKS The Type D Orifice Plate with its drilled orifice pattern is installed after the pressure regulating valve to smooth out turbulence caused by the pressure drop across the regulator. Noise reduction levels of 10 dBA can typically be achieved. INSTALLATION The Type D Orifice Plate is installed between ANSI flanges immediately after the regulator. If the regulator is a flanged unit, the orifice plate is placed at the flange outlet connection. Max. Temp. 450˚F @ 300 PSIG Series-D Orifice Plate FLOW A DIa. .75 Type D installed between flanges FLOW REGULATING VALVES