Technical Specifications

Why Install a Silencer on a Pneumatic Valve?

When a cylinder moves, air displaced from the opposite chamber is usually vented through the directional valve. That fast release can produce a repeated, sharp exhaust sound, especially on high-cycle machinery. A muffler installed in the valve's exhaust port disperses the jet through its porous element rather than allowing it to discharge directly to atmosphere.

On many five-port directional valves, ports 3 and 5 are exhaust ports. Check the valve schematic and actual port markings; exhaust arrangements vary.

Why a Conical Sintered-Bronze Element?

For a given base diameter, a cone can expose more porous surface than a flat disc. That extra surface gives the exhausting air more area through which to disperse while helping attenuate noise.

Conical geometry does not eliminate flow resistance. Pore size, contamination and actual exhaust flow determine the resulting backpressure; an undersized or blocked silencer can slow a cylinder.

Why a Brass Threaded Base?

Brass is machinable and provides a robust threaded connection. When installed into an aluminum valve body, a brass fitting avoids aluminum-on-aluminum thread contact, which can be susceptible to adhesive galling. It does not eliminate the possibility of corrosion, thread damage or seizure.

Use the correct mating thread and the manufacturer-recommended tightening method. A muffler is a noise-control device, not a substitute for a flow-control valve or a safety pressure-relief device.

Typical Applications

• Exhaust ports on compatible pneumatic directional control valves
• Pneumatic cylinders and automated machinery with frequent exhaust cycles
• Compressed-air control panels where the exhaust is discharged to atmosphere