Airtac PSL Throttle Speed Control Fitting PSL8-03A
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL8-03A 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 PSL8-03A
The PSL8-03A is an inline speed controller for Dia 8mm soft nylon or polyurethane tubing on a 3/8in PT threaded port. It throttles air in one direction and lets it pass freely in the other, so you set how fast an actuator strokes without touching the valve that drives it. This is the A suffix, meter-out: flow from the thread port to the tube is controlled, the return path runs free, and the handle is marked A. Meter-out is the first priority in AirTAC's own guidance because throttling the exhaust of a double-acting cylinder leaves a back-pressure cushion that keeps the stroke smooth instead of letting it lurch under a changing load.
The 3/8in taper thread suits larger valve manifolds and cylinder ports where a 1/4in boss would restrict the supply side of a mid-bore circuit. Adjustment is a knob with an aluminium locking cap: finger-set the speed, then screw the cap down so vibration cannot drift the setting. Note that the PSL body holds the tube in one fixed direction - it does not swivel like the PSS universal version - so plan your tubing route before mounting. Body, throttling column and fittings are brass with a PBT holder and NBR O-ring seals; the standard finish is grey (order PSL8-03AD for black).
Airtac PSL Throttle Speed Control Fitting PSL8-03A Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL8-03A |
|---|---|
| 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 PSL8-03A
| 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 PSL8-03A Is Used
Indexing pusher timed to a conveyor
A Dia 8-fed push cylinder advancing cartons between conveyor lugs needs a repeatable stroke time. Meter-out exhaust throttling holds that timing even when line loading changes, and the locking cap keeps the setting through a full shift.
Clamp arm closing on machined parts
A fixture clamp on a CNC secondary-operation cell closes onto finished aluminium faces. The PSL8-03A meters the closing stroke so the jaws seat gently, avoiding the slam that marks or shifts the workpiece.
Palletising gantry descent control
A pick-and-place gantry lowering boxes onto a pallet uses meter-out control on the down stroke. Back-pressure cushioning from the 3/8in ported controller stops the load free-falling at the end of travel and settles each layer squarely.
Is the Airtac PSL Throttle Speed Control Fitting PSL8-03A the Right Part?
Match the tube first, then the port. On the 3/8in thread ladder this size sits between PSL6-03A (Dia 6 tube) below and PSL10-03A (Dia 10 tube) above; stepping up gains flow capacity for larger bore cylinders, stepping down suits lighter loads and tighter bends. If your cylinder port is smaller than 3/8in, the same Dia 8 tube also exists as PSL801A on 1/8in and PSL802A on 1/4in. Choose meter-out (this A model) for a double-acting cylinder driven by a solenoid valve; choose the B meter-in version mainly for single-acting cylinders, where meter-in on a double-acting cylinder tends to stick-slip. Fit the controller directly at the cylinder port so the throttled air volume stays small and the response to each adjustment is immediate.
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 PSL8-03A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure down to -750 mmHg (10 Torr), and an ambient and media temperature range of -20 to +70 C. This SKU takes Dia 8mm soft nylon or polyurethane tubing on a 3/8in PT threaded port, in grey as standard (PSL8-03AD for black). Flow data is published as a characteristic curve rather than a single figure.
No. A speed controller is a flow control, not an isolation valve: by design it leaks slightly when fully closed, and this catalogue's speed controllers include no built-in silencer either. If you need positive shut-off with venting, use the AirTAC PHV finger valve in the same circuit. Also note the PT thread is a taper seal - use a small amount of seal tape on the male thread and avoid overtightening the brass body into the port.
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