Airtac BESL Throttle Type Silencer BESL02-S
SUS304 stainless variant (-S)The AirTAC Airtac BESL Throttle Type Silencer BESL02-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 BESL02-S
Every time a directional valve dumps a cylinder, the trapped pressure leaves as a sharp crack that repeats all shift long. The BESL02-S screws onto that exhaust port and breaks the pulse up inside a sintered ring, dropping the noise by 20 dB at 0.5 MPa. The body and adjuster are machined from SUS304 stainless steel, so this is the version for wash-down frames, marine decks and chemical splash zones where a painted alloy part would corrode away.
What separates the BESL family from a plain silencer is the built-in adjustable exhaust throttle. One screw lets you slow the discharged air, so the same part that quietens the valve also meters the cylinder's return speed - no separate flow control and no extra joint to leak. The BESL02-S takes a 1/4in PT thread, the body length varies as you turn the adjuster in or out, and the whole assembly survives -20 to +70 C.
Airtac BESL Throttle Type Silencer BESL02-S Technical Specifications
| Model | Airtac BESL Throttle Type Silencer BESL02-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 BESL02-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 BESL02-S Is Used
Food-line wash-down valves
On a packaging machine hosed down at end of shift, the alloy body of a standard BESL pits and seizes. The SUS304 body of the BESL02-S on a 1/4in exhaust port shrugs off caustic spray and the throttle screw keeps the eject cylinder's return gentle enough not to jar the product.
Marine deck and dockside actuators
Salt air eats plated fittings within months. Mounted on the 1/4in exhaust of a hatch or winch valve exposed to sea spray, the stainless body resists corrosion while the 20 dB drop keeps the crew's ear position beside the valve tolerable.
Chemical dosing skid vents
A dosing-pump skid cycling solenoid valves every few seconds drives operators out of the room. A BESL02-S on each 1/4in exhaust trims the report by 20 dB and lets the technician dial the vent rate down so splash-prone discharge stays slow and controlled.
Is the Airtac BESL Throttle Type Silencer BESL02-S the Right Part?
Pick the stainless BESL when the environment attacks metal: daily hose-down in food plants, salt air, plating-shop fumes. If noise is your only enemy and conditions are mild, the resin PAL line is the quieter and lighter choice. Do not buy this part expecting copper-free construction - only the SUS304 body is stainless; the sound-absorbing ring itself is copper-particle sintered, so keep it out of genuinely copper-prohibited processes.
Size to the valve's exhaust port, not down: a 1/4in BESL02-S suits a 1/4in port, with the BESL01-S (1/8in) below it in the ladder and the BESL03-S (3/8in) above. Stepping down saves space but chokes the exhaust, and a starved return stroke is the usual symptom; stepping up cuts back-pressure but costs length on a small valve. There is no M5 option in this series - the smallest BESL starts at 1/8in.
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 BESL02-S FAQ
It is a throttling silencer with a 1/4in PT thread and a SUS304 stainless body. Working pressure 0-1.0 MPa (0-10 kgf/cm2), it tolerates vacuum down to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the working temperature range is -20 to +70 C. The stainless silencing effect at 0.5 MPa is 20 dB for this thread size, achieved by a copper-particle sintered ring behind an adjustable exhaust throttle.
No. Only the body and adjusting parts are SUS304; the sound-absorbing element inside is a copper-particle sintered ring, so trace copper is present at the exhaust path. For a fully resin, copper-free option pick the PPA plug-in silencer instead, and accept that it does not offer the BESL's throttle adjustment.
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