Pneumatic Silencer

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The working principle of pneumatic silencers is to vent pressurized air after operating at safe noise levels and prevent the discharge of contaminants (if used in combination with a filter). Excessive noise may be produced when compressed air is released into the environment. Noise results from turbulent air due to the collision of fast-moving air released from the vents with static air in the environment. Typically, the silencer is installed directly at the vent of the valve and diffuses the released air through a larger surface area, reducing turbulence and noise levels. Pneumatic exhaust mufflers are typically designed with porous materials to increase the surface area of the exhaust ports they cover. They can also be mounted on a hose.

Breather Vents-allow air to flow in and out of an enclosed space, such as a gearbox, oil tank, or reservoir where varying liquid levels or mechanical action can create an extreme high or low pressure environment, which can damage expensive pneumatic system components. Breather vents have a screened opening to equalize pressure while preventing large particle contamination, also smoothing airflow to help reduce noise.
These mufflers are utilized for:
• Vacuum relief and overpressure protection.
• Noise reduction.
• Prevention of contamination.

Sintered Bronze Mufflers-are made of sintered bronze, a porous material that allows air to pass through while smoothing air flow over a greater surface area, reducing the noise level. Sintered bronze mufflers also provide filtering to prevent contaminants from entering an air system. When used on exhaust ports, they can help prevent oil mist from lubricated air sources from contaminating clean environments. Sintered bronze mufflers also provide a small amount of flow restriction to exhaust ports, helping to fine tune actuator speeds.
These mufflers are utilized for:
• Pneumatic equipment noise reduction.
• Exhaust and intake port protection.
• Flow regulation.

Metal Mufflers-are installed directly into the exhaust port of pneumatic valves and equipment. They work by diffusing the released air through a series of drilled baffles and screens which create a larger surface area, reducing turbulence and decreasing noise level. Metal mufflers can handle high volumes of high pressure air due to their durable construction and provide a small amount of flow restriction that can be useful in fine tuning actuator cycle times.
These mufflers are utilized for:
• Air valves, especially quick exhaust valves.
• Cylinders.
• Manifolds.
• Washdown areas.

Plastic Mufflers-have either injection-molded or sintered plastic bodies with plastic fibers, sintered plastic, or metal powder as the noise-reducing medium. They can be made of various resins, such as polyethylene, to provide resistance to most common chemicals and can be tuned to attenuate specific frequencies of sound- i.e. high frequencies from rotary or impact tools. Plastic mufflers can provide good noise reduction for enclosed areas or areas where pneumatic exhaust noise must be kept to a minimum. They can also filter exhaust air to help prevent lubrication oil mist from contaminating clean environments. Plastic mufflers are best used in semi-protected areas, as they are more prone to damage than sintered bronze or metal mufflers.
These mufflers are utilized for:
• Vacuum pumps.
• Small compressors.
• Pneumatic valves.
• Air motors.
• Rotary/Impact air tools.

Metal materials
1) Iron, steel and aluminum alloy: These materials have high density, high strength, good damping performance, and can effectively reduce low-frequency noise. But its density is large, can not absorb high-frequency noise.
2) Stainless steel: Pneumatic mufflers made of stainless steel have good corrosion resistance and are suitable for humid and acidic environments.

Non-metallic materials
1) Rubber: Rubber pneumatic muffler has good sound absorption performance and can filter out high frequency noise.
2) Polyester fiber: This material has good sound insulation effect and is suitable for protection against high frequency noise. It is characterized by light weight, high strength and good processability.
3) Glass fiber: It is a new type of pneumatic muffler material, which can effectively separate sound waves and has good sound absorption and sound insulation performance. In addition, glass fiber pneumatic muffler is not easy to gradual change, and can maintain long-term stable sound absorption effect.

Other materials
1) Ceramic: Ceramic pneumatic muffler has good high temperature resistance and mechanical strength, suitable for high temperature, high speed air volume, high pressure noise reduction occasions.
2) Synthetic membrane: This kind of material has good air permeability, and the adsorption effect of pollutants is also ideal. Synthetic membrane pneumatic muffler can achieve high sound absorption effect, regardless of time and environment limitations.