Pneumatic Exhaust Silencers Product Catalog
Overview of the Automatic Valve Exhaust Silencer Catalog
The Automatic Valve Pneumatic Exhaust Silencer catalog is a detailed product reference for engineers, maintenance teams, and pneumatic system designers seeking effective noise reduction solutions for compressed air exhaust systems. Published by Automatic Valve, part of the ROSS Controls global family, this catalog presents three distinct categories of exhaust silencers: high-flow silencers, sintered silencers, and exhaust restrictor silencers.
Each product category includes complete ordering information with model numbers, material options, port sizes, flow ratings in Cv and normalized liters per minute, dimensional data in both inches and millimeters, and approximate weights. The catalog also provides standard specifications for operating conditions, construction materials, temperature ranges, and filtration ratings, making it a one-stop reference for specifying silencers across a broad range of industrial pneumatic applications.
The AV Silencers are described as highly effective exhaust noise reduction options, featuring robust designs that can endure shocks and continuous use under various operating conditions. They are installed directly to the exhaust ports of pneumatic valves or manifold ports, and the catalog recommends mounting them in protective positions free from excessive vibration.
Silencer Features and Standard Specifications
All exhaust silencers in this catalog share several important design features and operating parameters. The robust construction is engineered to withstand shocks and continuous industrial use. Silencers mount directly to pneumatic valve exhaust ports or manifold ports with closely spaced configurations, without interfering with adjacent ports. Noise reduction impact falls in the 20 to 25 dB range, providing a meaningful improvement in workplace noise levels.
The catalog details standard specifications across several categories. For general connections, threaded ports are available in NPT and G (BSP) thread types, with body materials of zinc-plated steel, bronze, or stainless steel depending on the silencer type. Operating temperature for standard silencers ranges from 35 to 160 degrees Fahrenheit (1.6 to 70 degrees Celsius), while restrictor silencers have an extended range of 0 to 300 degrees Fahrenheit (1.6 to 149 degrees Celsius). For temperatures below 40 degrees Fahrenheit (4 degrees Celsius), the air supply must be free of water vapor to prevent ice formation.
The flow media for all silencers is filtered air. Filtration ratings for sintered and restrictor silencers are 40 microns for bronze elements and 70 microns for stainless steel elements. The maximum operating pressure across all silencer types is 300 PSIG (21.1 BAR).
Construction Materials
Silencer bodies are available in zinc-plated steel or 316 stainless steel for the high-flow types. Restrictor silencer bodies are available in bronze or 316 stainless steel. Screens across all types are made from 50-mesh stainless steel. This variety of construction materials allows engineers to select the appropriate silencer for their environment, whether a standard industrial setting or a corrosive or washdown application requiring stainless steel.
High-Flow Exhaust Silencers
The high-flow exhaust silencer line, designated as the 84C series, is the workhorse of the Automatic Valve silencer family. These silencers reduce exhaust noise levels while maintaining full-volume airflow with minimum back pressure. They thread directly into the exhaust port of pneumatic valves, making installation straightforward.
Zinc-plated steel models are available from 1/8-inch through 1-1/2-inch port sizes. The smallest model, the 84C-1 (1/8-inch), provides a Cv of 1.3 (1,300 Nl/min) and measures just 1.31 inches (33 mm) in length. The largest, the 84C-15 (1-1/2-inch), delivers a Cv of 39 (38,000 Nl/min) at 4.94 inches (125 mm) in length. NPT thread versions use standard model numbers, while R/Rp thread versions for international markets add a 'W' suffix.
Stainless steel versions of the high-flow silencers are available from 1/8-inch through 1-inch ports, designated with an 'S' suffix (e.g., 84C-1S through 84C-10S). These stainless models share the same flow ratings as their zinc-plated counterparts but are ideal for corrosive or high-purity environments. The stainless steel options are not currently available with R/Rp threads.
Sintered Exhaust Silencers
Sintered exhaust silencers, designated the 84D series, use sintered bronze or stainless steel filter media bonded to a male pipe fitting for effective noise reduction combined with particulate filtration. The bronze versions feature a cleanable 40-micron filter element, while stainless steel versions provide 70-micron filtration.
Bronze sintered silencers range from the miniature A7007-010 (10-32 thread, Cv 0.2) to the 84D-10 (1-inch, Cv 4.9). The A7007-010 is exceptionally compact at just 0.75 inches (19 mm) in length, making it suitable for space-constrained manifold installations. The full bronze lineup includes 1/8-inch through 1-inch port sizes with corresponding R/Rp thread versions available.
Stainless steel sintered silencers follow the same sizing from 10-32 thread through 1-inch, using an 'S' suffix designation. These models offer the same flow performance as the bronze versions but with the added corrosion resistance of stainless steel construction. All sintered silencers are corrosion resistant and their filter elements are cleanable, extending service life and reducing maintenance costs.
Exhaust Restrictor Silencers for Speed Control
Exhaust restrictor silencers, the 266B series, combine noise reduction with adjustable exhaust airflow restriction. This dual function makes them particularly valuable in applications where precise cylinder speed control is required, as they allow operators to regulate the exhaust flow rate at the valve's exhaust port.
Bronze restrictor silencers are available from 1/8-inch through 1-inch port sizes, with Cv ratings from 1.2 (1,200 Nl/min) for the 266B-1 up to 6.8 (68,000 Nl/min) for the 266B-10. The bronze elements feature a 40-micron cleanable filter element and corrosion-resistant construction. R/Rp thread versions are available with the 'W' suffix.
Stainless steel versions range from 1/8-inch through 1-inch with the 'S' suffix designation. They deliver the same flow performance with enhanced material durability for demanding environments. The restrictor silencers have an extended operating temperature range of 0 to 300 degrees Fahrenheit compared to 35 to 160 degrees Fahrenheit for standard silencers, making them suitable for both cold-storage and high-temperature applications.
Ordering and Thread Options
The catalog provides a clear ordering structure for all silencer types. Standard NPT thread models use the base model number (e.g., 84C-2 for a 1/4-inch high-flow silencer). R/Rp (BSP) thread versions add a 'W' suffix (e.g., 84C-2W). Stainless steel versions add an 'S' suffix (e.g., 84C-2S). This consistent naming convention makes it easy to specify the correct silencer for your application.
All silencers include dimensional data showing overall length and hex size for proper wrench selection during installation. Weights are listed in both pounds and kilograms. The catalog notes that silencers should be mounted in protective positions free from excessive vibration to ensure long service life and reliable noise reduction performance.
Automatic Valve maintains a global distribution network with offices in the United States, Canada, Brazil, Germany, France, the United Kingdom, India, China, and Japan. For assistance with silencer selection and specification, engineers can contact their nearest Automatic Valve or ROSS Controls location.
Frequently Asked Questions
What types of pneumatic exhaust silencers does Automatic Valve offer?
Automatic Valve offers three categories of exhaust silencers: high-flow silencers (84C series) in zinc-plated steel and stainless steel for maximum airflow with minimum back pressure; sintered silencers (84D series) in bronze and stainless steel with built-in filtration; and exhaust restrictor silencers (266B series) in bronze and stainless steel that combine noise reduction with adjustable flow control for cylinder speed regulation.
What port sizes are available for Automatic Valve exhaust silencers?
High-flow silencers (84C series) are available from 1/8-inch through 1-1/2-inch NPT. Sintered silencers (84D series) range from 10-32 thread through 1-inch NPT. Exhaust restrictor silencers (266B series) are available from 1/8-inch through 1-inch NPT. BSP (R/Rp) thread options are available on most models by adding a 'W' suffix to the model number.
How much noise reduction do Automatic Valve exhaust silencers provide?
Automatic Valve exhaust silencers deliver noise reduction in the 20 to 25 dB range. This reduction significantly lowers workplace noise levels when installed on pneumatic valve exhaust ports. The robust design withstands shocks and continuous industrial use, maintaining noise reduction performance over extended service periods.
What is the maximum operating pressure for Automatic Valve silencers?
All Automatic Valve exhaust silencers are rated for a maximum operating pressure of 300 PSIG (21.1 BAR). Standard silencers operate in ambient temperatures from 35 to 160 degrees Fahrenheit (1.6 to 70 degrees Celsius), while restrictor silencers have an extended range of 0 to 300 degrees Fahrenheit (1.6 to 149 degrees Celsius).
Are stainless steel exhaust silencers available from Automatic Valve?
Yes. All three silencer categories offer stainless steel options. High-flow silencers use 316 stainless steel bodies (84C-S series) from 1/8-inch to 1-inch. Sintered silencers use stainless steel filter media and bodies (84D-S series) from 10-32 to 1-inch. Restrictor silencers use stainless steel construction (266B-S series) from 1/8-inch to 1-inch. Stainless steel models are ideal for corrosive environments, washdown areas, and high-purity applications.