Airtac BESL Throttle Type Silencer BESL04
The AirTAC Airtac BESL Throttle Type Silencer BESL04 is a genuine throttling silencer that cuts exhaust noise by 13 dB at 0.5 MPa using a sintered brass silencer ring with an adjustable exhaust throttle.
- TypeThrottling silencer
- SeriesBESL
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Noise reduction13 dB
- Temperature-20 to +70 °C
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac BESL Throttle Type Silencer BESL04
Every time a valve dumps a cylinder, the trapped air expands in one violent pulse and that pulse is the crack you hear on the factory floor. A silencer screwed into the exhaust port breaks that pulse up before it leaves the machine. The BESL04 does this with a brass-particle sintered ring that scatters the pressure wave into thousands of tiny passages, cutting exhaust noise by 13 dB measured at 0.5 MPa.
What separates the BESL04 from a plain muffler is the built-in exhaust throttle. An adjusting screw on the aluminium body meters how fast air escapes, so the same part that quiets the exhaust also sets the return speed of the cylinder it feeds. This is the largest BESL in the range at 1/2" PT thread, sized for big valve exhaust ports where a smaller part would choke flow and drag the retract stroke.
Airtac BESL Throttle Type Silencer BESL04 Technical Specifications
| Model | Airtac BESL Throttle Type Silencer BESL04 |
|---|---|
| Type | Throttling silencer |
| Series | BESL |
| Noise reduction | 13 dB at 0.5 MPa |
| Element | Sintered brass silencer ring with an adjustable exhaust throttle |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
POM release button and chuck, aluminium-alloy guide, stainless spring gasket, NBR O-ring; body brass or PBT depending on the part. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac BESL Throttle Type Silencer BESL04
| BESL | Throttling silencer. |
|---|---|
| 01 / 02 / 03 / 04 | Thread: 1/8", 1/4", 3/8", 1/2". M5 where the series offers it. |
| D | Black. Blank = grey. |
Choosing a Silencer
- check Sintered-brass types (BSL / BSLM / BESL) give 13 dB and take rough treatment.
- check Resin types (PAL / PALM / PPA) give 25 dB and weigh far less.
- check PPA plugs straight into a tube instead of a thread, and is copper-free for sensitive processes.
- check BESL adds an adjustable throttle, so it silences AND sets exhaust speed in one part.
- check An undersized or clogged silencer shows up as a slow return stroke - size it to the valve's exhaust port.
Where the Airtac BESL Throttle Type Silencer BESL04 Is Used
Stamping press clamp circuits
Heavy clamping cylinders on a press release a large air volume every cycle. The 1/2" port and adjustable throttle let the setter quiet the dump and still hold the clamp-release speed the cycle time needs.
Bottling line gate cylinders
Operators stand beside the valve bank of a filling line for a full shift. Fitting a BESL04 on each large exhaust port trims the background crack of air and lets the gates be tuned per station.
Meeting a workplace noise limit
When a noise survey flags pneumatic exhaust as the culprit on a machine, throttling silencers let the retrofit team both cut the measured level and re-tune stroke speeds without adding a separate flow control valve.
Is the Airtac BESL Throttle Type Silencer BESL04 the Right Part?
Step down to the BESL03 (3/8" PT) when the valve port is smaller; the thread is the only thing that changes, but a silencer under the port size becomes the bottleneck and slows the stroke you paid the valve to move fast. There is no BESL above 1/2", so the BESL04 is the end of the ladder for large exhaust ports. If you need silencing alone with no speed control, the BSL04 universal silencer carries the same 13 dB figure in a simpler body.
Choose metal over resin here when the exhaust sits where it will be knocked by trolleys or splashed with oil and swarf, and when ambient heat rules out a plastic body. Sintered brass handles rough duty; the resin PAL series is quieter at 25 dB but is the wrong pick in that environment. Always size to the valve's exhaust port, not down to save money.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within -20 to +70 °C
- ✓ Noise target: 13 dB metal or 25 dB resin
Airtac BESL Throttle Type Silencer BESL04 FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. The thread is 1/2" PT and the noise reduction is 13 dB at 0.5 MPa, achieved by the brass-particle sintered silencer ring. The body length is adjustable: the smallest BESL01, for example, spans 33 mm at minimum to 40.5 mm at maximum.
Both share the same 13 dB sintered-brass element and 1/2" thread, but the BESL04 adds an adjustable exhaust throttle in the same part. That means one component does the job of a silencer plus a meter-out or meter-in flow control on the exhaust side. If your cylinder speed is already set elsewhere and you only need quiet, the simpler BSL04 is enough; if you want to tune retract speed at the port itself, the BESL04 saves the extra fitting.
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