Airtac PSL Throttle Speed Control Fitting PSL802BD-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL802BD-S is a genuine speed controller, threaded elbow with knob with aluminium-alloy locking cap and fixed tube direction, used to set the speed of a pneumatic cylinder by throttling its air.
- TypeSpeed controller, threaded elbow
- SeriesPSL
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- AdjustmentKnob with aluminium-alloy locking cap
- 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 PSL Throttle Speed Control Fitting PSL802BD-S
The PSL802BD-S is the SUS304 stainless build of the AirTAC PSL speed controller, sized for Dia 8 soft nylon or polyurethane tubing on a 1/4in PT taper thread. Like every PSL, it throttles air in one direction and lets it pass freely in the other, so a stroke can be slowed while the return path stays open. The B suffix makes this the meter-in version: flow from the 1/4in port into the tube is controlled, and flow back out of the tube runs free. The handle is stamped B so the setting direction stays readable once the part is buried in a machine frame.
Adjustment is a black knob (the D colour suffix) with an aluminium-alloy locking cap: set the speed by hand, then tighten the cap so vibration cannot walk the setting away. In the -S build the brass throttling column of the standard PSL is replaced with SUS304 and the spring gasket is stainless, aimed at wash-down, plating and other corrosive or copper-free circuits. The stainless construction does not change any rating: 0-1.0 MPa working pressure, 1.5 MPa proof, -20 to +70 C, and the same dimension tables as the standard part.
Airtac PSL Throttle Speed Control Fitting PSL802BD-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL802BD-S |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed tube direction |
| 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 |
| Applicable tubing | Soft nylon or polyurethane tube |
| 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 throttling column and body parts in place of brass, for copper-free environments. Ratings are unchanged from the standard version. A speed controller is not a shut-off valve - a small leak past a fully closed needle is normal. Close it before applying air, and turn it open slowly. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PSL Throttle Speed Control Fitting PSL802BD-S
| PSL | Speed controller, threaded elbow. |
|---|---|
| 4 / 6 / 8 / 10 / 12 | Tube outside diameter in mm (3.2 mm exists on the mini series). |
| M5 / 01 / 02 / 03 / 04 | Thread: M5x0.8, 1/8", 1/4", 3/8", 1/2" (M3 on the mini series). |
| A / B | A = meter-out (controls flow from the thread port to the tube). B = meter-in. |
| D | Black. Blank = grey. |
| -S | Stainless-steel body. |
Meter-Out or Meter-In?
- check Meter-out (A) is the default. It throttles the air LEAVING the cylinder, so the piston runs against a back-pressure cushion and moves smoothly.
- check Use meter-out on double-acting cylinders - it is the one AirTAC lists as first priority.
- check Meter-in (B) throttles air ENTERING the cylinder. It suits single-acting cylinders and air motors.
- check Meter-in on a double-acting cylinder tends to give a jerky, stick-slip stroke under varying load.
- check Fit the controller at the cylinder port, not at the valve, so the throttled volume is as small as possible.
Where the Airtac PSL Throttle Speed Control Fitting PSL802BD-S Is Used
Plating-line single-acting clamp
A spring-return clamp that lowers a jig gently onto freshly plated work above an acid tank. The SUS304 throttling column resists the fume-laden atmosphere, and the copper-free wetted path suits plating chemistry where dissolved copper ruins baths.
Bakery tray wash-down pusher
A Dia 8 single-acting pusher indexing trays through a daily caustic wash. The stainless flow path and black knob body survive hose-down, and meter-in control lets the push stroke be slowed without fighting the return spring.
Chemical dosing skid actuator
A small spring-return dosing cylinder on a reagent dosing skid that must stroke in about two seconds, every cycle. The B code meters the inward power stroke while the spring exhausts freely, and the SUS304 column avoids copper contact with aggressive media.
Is the Airtac PSL Throttle Speed Control Fitting PSL802BD-S the Right Part?
Meter-in control is the natural pairing for single-acting and spring-return cylinders, where pushing flow in gently and letting the spring exhaust freely gives a clean, stable stroke. AirTAC's own guidance is that meter-out (the A suffix) is the first priority for double-acting cylinders, because exhaust throttling builds a back-pressure cushion that stops stick-slip under varying load, so pick this B code deliberately, not by default. Note that PSL screws into the port with a fixed tube direction; if your hose has to swivel on installation, the PSS universal body does that instead. On the same 1/4in thread the neighbours are Dia 6 below and Dia 10 above: the smaller bore gives finer control on compact rams, the larger breathes better on volume-hungry actuators. A Dia 8 PSL also exists on 1/8in and 3/8in threads if your port size differs. Whichever you choose, fit the controller directly at the cylinder port so the throttled air volume stays small and the response stays crisp.
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
- ✓ Meter-out (A) unless you know you need meter-in
Airtac PSL Throttle Speed Control Fitting PSL802BD-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and a temperature range of -20 to +70 C. This SKU takes Dia 8 soft nylon or polyurethane tubing on a 1/4in PT thread, is the meter-in (B) control direction, and has the black D colour body. The SUS304 stainless build carries exactly the same ratings as the standard PSL802BD - nothing is re-rated.
Only the materials in the adjustment and flow path: the brass throttling column becomes SUS304, the throttling body is aluminium alloy or SUS304 depending on the part, and the spring gasket is stainless. Dimensions, the knob and locking cap, the A/B control method and every pressure, vacuum and temperature figure are identical to the standard PSL. AirTAC publishes no food or medical certification and no corrosion class for this series, so specify it for corrosion resistance and copper-free construction rather than as a certified food-grade part.
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