Airtac BESL Throttle Type Silencer BESL04-S
SUS304 stainless variant (-S)The AirTAC Airtac BESL Throttle Type Silencer BESL04-S is a genuine throttling silencer that cuts exhaust noise by 20 dB at 0.5 MPa using a copper-particle sintered element in a SUS304 body.
- TypeThrottling silencer
- SeriesBESL
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Noise reduction20 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-S
The BESL04-S sits on the 1/2 inch exhaust port of a directional valve and does two jobs at once. It breaks up the pressure pulse that makes the crack of venting air, cutting noise by 20 dB at 0.5 MPa, and its built-in adjustable throttle lets you dial the exhaust flow to control actuator speed without a separate speed valve.
The -S suffix makes this the stainless build: a SUS304 body and adjusting parts over a copper-particle sintered silencer ring, which suits copper-prohibited and corrosive locations far better than the aluminium-alloy standard BESL. The element itself is a sintered metal part, so this is not a resin component. Ratings are unchanged by the stainless construction, and the body is adjustable in length as the throttle is set.
Airtac BESL Throttle Type Silencer BESL04-S Technical Specifications
| Model | Airtac BESL Throttle Type Silencer BESL04-S |
|---|---|
| Type | Throttling silencer |
| Series | BESL |
| Noise reduction | 20 dB at 0.5 MPa |
| Element | Copper-particle sintered element in a sus304 body |
| Body material | Stainless steel 304 (-S variant) |
| 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. Stainless (-S): SUS304 silencer body. The sound-absorbing element remains copper-particle sintered, so this variant is specified for corrosion resistance rather than as a wholly copper-free 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-S
| 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. |
| -S | Stainless-steel body. |
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-S Is Used
Bottling line wash-down zone
On a filler or capper deck hosed down with caustic foam each shift, the SUS304 body of the BESL04-S resists the pitting that swells an aluminium silencer shut, while the throttle tames the violent exhaust crack of the 1/2 inch transfer valve beside the operators.
Electroplating hoist valve bank
Acid mist above a plating tank eats standard silencers and copper-bearing parts are unwelcome near the bath chemistry. The stainless body and sintered ring keep the nickel-line hoist cylinders quiet as they index racks between tanks.
Marine deck winch control
Salt spray on a fishing vessel or workboat deck corrodes plain aluminium in months. Fitted to the 1/2 inch exhaust of the winch control valve, the BESL04-S quiets the blast that deafens the deckhand standing at the lever, and the throttle softens the cylinder snap as the net drum homes.
Is the Airtac BESL Throttle Type Silencer BESL04-S the Right Part?
Step down to BESL03 (PT 3/8) when the valve exhaust port is smaller or you want a more compact silencer on a lighter air consumer; BESL04-S is the largest size in the BESL ladder, so there is no step up from 1/2 inch in this series. Never size down below the valve's exhaust port - an undersized silencer restricts exhaust, slows the return stroke and can leave the cylinder crawling on long lines.
Choose the -S over the standard BESL where wash-down chemicals, salt-laden air or plating mist would pit an aluminium body, and where the process forbids exposed copper surfaces. Note that the published stainless silencing figure of 20 dB at 0.5 MPa applies to this 1/2 inch thread, and it exceeds the standard-line figure for the same series.
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-S FAQ
It is the SUS304 stainless throttling silencer with a PT 1/2 inch thread. Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and a working temperature of -20 to +70 C. Silencing effect is 20 dB at 0.5 MPa. The stainless construction changes the material and the silencing figure only - every pressure, vacuum and temperature rating matches the standard BESL04.
The adjusting section on the BESL04-S is an exhaust-side flow control: rotate it to restrict or open the vent path. Fully open gives the least back-pressure and the fastest exhaust; closing it meters the air leaving the valve, which slows the controlled stroke of the cylinder without needing a separate inline speed valve. Because it acts only on the exhaust side, supply-side flow controls are still used where meter-in speed setting is required.
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