Airtac PSL Throttle Speed Control Fitting PSL12-04B
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL12-04B 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 PSL12-04B
The PSL12-04B is a threaded-body speed controller that screws into a 1/2in PT port and takes Dia 12 soft nylon or polyurethane tubing on its one-touch outlet. The B suffix makes it a meter-in type: air flowing from the thread port into the tube runs free, so the actuator extends at full line pressure, while the reverse flow, leaving the actuator through the tube, is throttled by an adjustable needle column. AirTAC marks the handle B so anyone servicing the machine can confirm the flow direction at a glance without tracing pipework.
Adjustment is a grey knob with an aluminium-alloy locking cap: set the stroke speed by hand, then screw the cap down so vibration on the machine frame cannot drift the setting. The throttling column and seat are brass, the holder is PBT plastic, and the seals are NBR. The part also tolerates vacuum down to -750 mmHg (10 Torr), so it can sit on a suction leg as well as a pressure line. AirTAC recommends meter-in control for single-acting cylinders; on a double-acting cylinder driven this way the stroke can stick-slip under a changing load.
Airtac PSL Throttle Speed Control Fitting PSL12-04B Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL12-04B |
|---|---|
| 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 PSL12-04B
| 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 PSL12-04B Is Used
Date-code stamping head
A single-acting stamp cylinder on an injection-moulding cell marks batch codes on each part. The PSL12-04B throttles the return stroke so the die lifts off the finished surface gently instead of snapping up on the spring.
Carton kick-off ejector
A spring-return pusher nudges cartons off the end of a packing conveyor. Meter-in control on the Dia 12 supply line lets the ejector retract at a set pace so cartons leave the lane one at a time without tipping.
Swing clamp on a welding jig
A single-acting swing clamp closes onto sheet metal before welding. The B-type controller slows the clamping motion so the clamp arm seats onto the workpiece without shock, and the locking cap holds that setting through plant vibration.
Is the Airtac PSL Throttle Speed Control Fitting PSL12-04B the Right Part?
Pick meter-in (this B code) when the actuator is single-acting: a spring-return cylinder, an air bellows or a single-port clamp, where throttling the return gives a controlled stroke. If your actuator is double-acting and driven by a solenoid valve, AirTAC treats meter-out as the first priority - the A code PSL12-04A - because throttling the exhaust leaves a back-pressure cushion that keeps the stroke smooth under varying load.
This is the top of the PSL ladder: Dia 12 on a 1/2in thread is the largest combination the series offers, so there is nothing to step up to. Stepping down you can take PSL10-04 (Dia 10 on the same 1/2in thread, a smaller bore for lighter loads) or PSL12-03 (Dia 12 on a 3/8in thread, if the port on your valve or cylinder is 3/8in). Unlike the PSS universal type, the PSL tube outlet is fixed; if a cramped port needs the outlet to swivel, PSS also reaches Dia 12 on 1/2in. Fit the controller directly at the cylinder port so the throttled volume stays small and 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 PSL12-04B FAQ
Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates negative pressure down to -750 mmHg (10 Torr), and proof pressure is 1.5 MPa. The working temperature range is -20 to +70 C. This SKU fits Dia 12 soft nylon or polyurethane tubing on a 1/2in PT thread and comes in AirTAC's standard grey (add the D suffix for black).
No. A speed controller is designed to throttle, and even fully closed it lets a slight leakage past the needle by design, so it must never be used to isolate a circuit. For positive shut-off use AirTAC's PHV finger valve, a manual quarter-turn valve (the A version vents the outlet to atmosphere when closed). Keep the PSL12-04B for speed setting only.
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