Airtac PSL Throttle Speed Control Fitting PSL12-04A
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL12-04A 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 PSL12-04A
The PSL12-04A is AirTAC's largest standard PSL speed controller, built for Dia 12 soft nylon or polyurethane tubing and a PT 1/2in port. It throttles flow in one direction and lets air pass freely in the other, which is how you set a cylinder's stroke speed without losing force. The A suffix means meter-out: air travelling from the 1/2in thread port to the tube is controlled, while the return path runs wide open. Handle marked A.
Meter-out is AirTAC's first-priority method, and on a bore this size the reason is easy to see. Throttling the exhaust traps a back-pressure cushion ahead of the piston, so a big double-acting cylinder stays smooth instead of lurching under a changing load. Adjustment is a grey knob with an aluminium locking cap: twist to set the speed, then tighten the cap so vibration cannot drift the setting. Body materials are brass for the throttling column and body, PBT plastic for the holder, with an NBR O-ring sealing the interface.
Airtac PSL Throttle Speed Control Fitting PSL12-04A Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL12-04A |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed tube direction |
| 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. 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 PSL12-04A
| 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. |
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 PSL12-04A Is Used
Heavy press and forming heads
A 12mm-line press head descending onto sheet metal needs meter-out damping or it slams on contact. Exhaust throttling at the 1/2in cylinder port holds a back-pressure cushion all the way down.
Baling and compaction rams
Large compaction rams on Dia 12 tubing cycle under wildly varying loads. The locked knob keeps the set stroke speed from drifting as the ram meets resistance.
Trailer tailgate lift cylinders
Tail-lift rams plumbed in 12mm hose must lower loads at a controlled crawl. The 1/2in PSL12-04A meters the exhaust so the platform descends smoothly under full payload.
Is the Airtac PSL Throttle Speed Control Fitting PSL12-04A the Right Part?
This is the top of the 1/2in ladder. PSL12-04A is the largest tube size available on the PT 1/2in thread - the only step down is the PSL10-04 on Dia 10, and there is nothing above Dia 12 on this prefix. If your circuit uses 3/8in ports instead, the same Dia 12 tube exists as the PSL12-03, so you can keep the bore and drop the thread. Choose the PSS12-04 universal type if the tube needs to swivel 360 degrees at the port; the PSL body is fixed-orientation by design.
Fit the controller directly at the cylinder port rather than back at the valve manifold. Throttling at the port keeps the compressed volume being squeezed small, which sharpens speed response on long Dia 12 lines.
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 PSL12-04A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, and it holds vacuum to -750 mmHg (10 Torr). Temperature range is -20 to +70 C. This SKU fits Dia 12 soft nylon or polyurethane tube on a PT 1/2in thread and is meter-out (A) control. Standard colour is grey; a -D suffix would be black.
No. A speed controller leaks slightly when fully closed by design, so it must never be relied on to isolate a circuit. If you need to vent or isolate the line, fit a proper shut-off such as AirTAC's PHV finger valve, and keep the PSL12-04A doing what it is made for: setting stroke speed by throttling one direction of flow.
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