Airtac PSL Throttle Speed Control Fitting PSL1203AD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1203AD 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 PSL1203AD
The PSL1203AD is a Dia 12 bore speed controller with a 3/8in PT male thread, finished in AirTAC's black D-suffix colour so it stands out on crowded valve manifolds. The A suffix makes it meter-out: air flowing from the 3/8in thread port into the Dia 12 tube is throttled, while the return path passes freely. On a double-acting cylinder driven by a solenoid valve, throttling the supply-out side leaves a back-pressure cushion so the rod glides instead of lunging - AirTAC itself calls meter-out the first priority choice. Air supply to a single-acting cylinder is better served by the B version instead.
Adjustment is a knurled knob with an aluminium-alloy locking cap: set the stroke speed, then screw the cap down and the setting survives plant vibration and stray hands. Construction matches the standard PSL build - brass throttling column and body, PBT plastic holder, NBR O-ring and POM sealing faces. At Dia 12 this is the largest bore the PSL prefix offers at a 3/8in thread, so it suits the big end of the ladder: slides, presses and long-stroke actuators that move serious air.
Airtac PSL Throttle Speed Control Fitting PSL1203AD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1203AD |
|---|---|
| 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 PSL1203AD
| 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 PSL1203AD Is Used
Palletiser push-off arm
A Dia 12 cylinder that sweeps cartons onto a takeaway conveyor needs the same sweep time every cycle. Meter-out throttling at the cylinder port keeps the stroke constant even as supply pressure drifts through the shift.
Press-shop part ejection
Ejector cylinders on a stamping cell drop finished parts into a chute. The PSL1203AD's large Dia 12 bore passes the return stroke freely while the locked knob setting controls the ejection speed so parts land, not launch.
Bottling line lane divider
Blade cylinders that divide PET bottle lanes on a filler must swing fully in a fixed timing window. Setting the speed at the blade, with the locking cap tightened, survives the washdown-adjacent vibration of the conveyor frame.
Is the Airtac PSL Throttle Speed Control Fitting PSL1203AD the Right Part?
Sizing both ways: step down to PSL1003AD (Dia 10 tube on the same 3/8in thread) when the actuator is smaller and you want finer low-speed control, or move up to PSL1204AD (Dia 12 on 1/2in thread) when the port on your cylinder or valve is already 1/2in and you would rather not adapt. Tube size governs how much air the free-flow direction can pass; thread size only has to match the port you are screwing into. If your machine mixes sizes, PSS universal and PSA inline types cover the rest of the ladder.
Fit the controller directly at the cylinder port, not back at the valve. Throttling works on the air between the restrictor and the actuator, so the shorter that trapped volume, the more responsive and repeatable the speed setting. Use soft nylon or polyurethane tubing only - harder tubing will not seal on the one-touch collet.
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 PSL1203AD FAQ
This SKU is a Dia 12 tube speed controller with a 3/8in PT male thread, meter-out (A) control, black body. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), and proof pressure 1.5 MPa - 50% above the maximum working pressure. Ambient and media temperature range is -20 to +70 C. Use soft nylon or polyurethane tubing; the PT thread seals with sealant tape as standard.
The aluminium locking cap clamps the knob after you set the speed, so vibration from a press or palletiser cannot drift the setting - hand-loosen it, adjust, re-tighten. But do not use it as a shut-off: a speed controller throttles by design and leaks slightly when fully closed. To isolate a circuit you need a real shut-off valve, such as the AirTAC PHV finger valve range.
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