Airtac PSL Throttle Speed Control Fitting PSL1203A-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1203A-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 PSL1203A-S
The PSL1203A-S is a stainless-steel variant of AirTAC's PSL speed controller, sized for Dia 12mm soft nylon or polyurethane tubing with a 3/8in PT male thread. It throttles air flowing from the thread port out to the tube while letting the return flow pass freely, and the A suffix confirms meter-out control, the method AirTAC recommends first. On a double-acting cylinder driven by a solenoid valve, meter-out throttling holds back-pressure on the exhausting side, so the piston rides on an air cushion instead of lurching ahead of the load.
Adjustment is a knob with an aluminium locking cap: set the speed, then screw the cap down so vibration cannot drift the setting. Inside, the -S build fits a SUS304 throttling column in place of the brass column used on the standard part, with a stainless spring gasket, which removes copper from the wetted flow path. Ratings are identical to the standard PSL1203A: 0-1.0 MPa working pressure, 1.5 MPa proof pressure, -20 to +70 C, and -750 mmHg vacuum, so the stainless option buys corrosion resistance without re-rating anything.
Airtac PSL Throttle Speed Control Fitting PSL1203A-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1203A-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 PSL1203A-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 PSL1203A-S Is Used
Plating line rinse-station lift
A Dia 12 cylinder raises and lowers racks through rinse tanks on an electroplating line. Meter-out control on the 3/8in port keeps the descent slow so racks do not splash caustic solution, and the SUS304 throttling column tolerates the acidic atmosphere that pits brass fittings.
Wash-down tray ejector on a bakery line
A 12mm-bore pusher ejects baked trays from an oven exit conveyor and is hosed down every shift. Throttled exhaust gives a repeatable push speed matched to the belt, and the stainless internals survive caustic foam cleaner that would corrode a brass-column controller.
Copper-free fixture clamping in electronics assembly
A pneumatic clamp closes a PCB test fixture on a line where copper particle contamination risks contact failure. The SUS304 column and stainless spring gasket keep brass out of the 3/8in supply path while meter-out control lowers the clamp head gently onto the board.
Is the Airtac PSL Throttle Speed Control Fitting PSL1203A-S the Right Part?
Step down to the PSL103A-S if your tubing is Dia 10 on the same 3/8in thread; the smaller bore means lower free-flow capacity through the same port. This Dia 12 size is the largest tube AirTAC makes on the PSL 3/8in ladder, so there is no step up in tube here. If you want to keep 12mm tubing but move to a bigger port, the next thread is 1/2in, the PSL1204A-S; note that stepping down to 1/4in does not work, because the PSL 1/4in range tops out at Dia 10. Fit the controller directly at the cylinder port so only the short cylinder volume is throttled, not long runs of supply line.
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 PSL1203A-S FAQ
It is a SUS304 stainless meter-out speed controller for Dia 12mm soft nylon or polyurethane tube with a 3/8in PT male thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure -750 mmHg (10 Torr) and operating temperature -20 to +70 C. Flow control, reverse free flow, and the -S build swap the brass throttling column for SUS304; every pressure and temperature figure matches the standard PSL1203A.
No. A speed controller is a throttle, not an isolation valve, and by design it leaks slightly when the knob is fully closed. For a manual shut-off with a vented outlet in this size range, use the AirTAC PHV12A finger valve, a quarter-turn valve rated for the same 0-1.0 MPa circuit.
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