Airtac PSL Throttle Speed Control Fitting PSL802A-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL802A-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 PSL802A-S
The PSL802A-S sets the stroke speed of an actuator by throttling the air in one direction while letting it run freely the other way. The A suffix marks it as a meter-out controller: flow from the 1/4in PT thread port out through the Dia 8 tube is throttled, and the return path passes unrestricted. The handle carries the letter A so the setting cannot be read backwards on the machine. AirTAC's own catalogue names meter-out as the first choice, and the reason is back-pressure: on a double-acting cylinder driven by a solenoid valve, restricting the exhaust cushions the load, so the rod keeps moving smoothly instead of lunging and sticking.
The -S suffix makes this the stainless variant. AirTAC fits a SUS304 throttling column in place of the brass one used on the standard PSL802A, with the body in aluminium alloy or SUS304 and a stainless spring gasket, so the wetted path is copper-free. Adjustment is a knob with an aluminium locking cap: set the speed, then screw the cap down so vibration cannot drift the setting. Thread it into the 1/4in port, push 8mm soft nylon or polyurethane tubing into the outlet. Rated 0-1.0 MPa working, 1.5 MPa proof, -20 to +70 C, and it holds -750 mmHg vacuum.
Airtac PSL Throttle Speed Control Fitting PSL802A-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL802A-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 PSL802A-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 PSL802A-S Is Used
Bakery line wash-down clamp
A clamp cylinder closing trays on a bakery wash-down conveyor gets gentle meter-out contact from the Dia 8 outlet, and the SUS304 throttling column shrugs off daily caustic hose-down where a brass column would dull and pit.
Electroplating transfer arm
On a plating line, a pick arm lifting racks between rinse tanks is slowed on the exhaust side by the 1/4in meter-out control, and the copper-free wetted path keeps metal ions out of the bath chemistry.
Marine hatch damper pusher
A deck hatch pusher on a workboat strokes slowly against salt spray: the locking cap holds the stroke setting through vibration, and the stainless internals resist the salt-laden exhaust air that eats standard brass internals.
Is the Airtac PSL Throttle Speed Control Fitting PSL802A-S the Right Part?
For a double-acting cylinder, meter-out is the right call, so this A-type suits; if your actuator is single-acting, the B-type PSL802B-S throttles on the supply side instead and is the better match. The knob-plus-locking-cap layout suits settings you check occasionally; if the controller lives where an operator can knock it, a push-lock PTL802-S holds its setting harder. The tube is fixed in line with the thread on this body - if you need the outlet to swivel 360 degrees to suit awkward hose routing, that is the PSS802A-S instead.
Sizing both ways on the 1/4in ladder: one step down is the PSL602A-S on 6mm tube, which raises restriction in the same circuit and suits lighter loads or slower strokes; one step up is the PSL1002A-S on 10mm tube, which passes more air and suits heavier actuators. Whichever you fit, mount it directly at the cylinder port, because the throttled air volume between controller and actuator is what determines how crisply you can trim the speed.
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 PSL802A-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, ambient and media temperature -20 to +70 C. This SKU takes Dia 8 soft nylon or polyurethane tubing on a 1/4in PT thread and is a meter-out (A) controller with a SUS304 throttling column and a grey body (add D for black). It runs on the same ratings as the standard PSL802A - stainless changes the material, not the pressure or temperature figures.
Yes, one for one. AirTAC publishes identical dimensions for both, so piping, panel cut-outs and the mounting position do not change. What changes is the internals: the brass throttling column becomes SUS304 and the spring gasket goes stainless, making the wetted path copper-free and corrosion-resistant. Set it the same way as before - throttle the exhaust at the cylinder port for a smooth double-acting stroke, lock the knob cap, and expect identical speed behaviour for the same load.
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