Airtac PSL Throttle Speed Control Fitting PSL4M5BD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL4M5BD 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 PSL4M5BD
The PSL4M5BD is a compact AirTAC speed controller that throttles air in one direction and lets it pass freely in the other, so you can set how fast an actuator strokes. The B in the code marks it as a meter-in type: flow from the M5 thread port out through the Dia 4 tube runs free, while the return direction is throttled. AirTAC's own selection guidance makes meter-out the default choice, but meter-in is the correct method for a single-acting, spring-return cylinder where there is no exhaust cushion to work with. On a double-acting cylinder under a changing load, meter-in control can produce stick-slip, so check the actuator type before ordering.
Thread the M5 stud into the valve or manifold port and push a 4mm soft nylon or polyurethane tube into the fixed outlet; unlike the PSS universal type, the tube direction on a PSL does not swivel. Speed is set with a knurled knob and held by an aluminium locking cap, so the setting survives vibration. The throttling column and body are brass inside an aluminium-alloy and PBT assembly with an NBR seal. The trailing D in the order code specifies the black colour variant instead of the standard grey, useful where panels and machine furniture are black.
Airtac PSL Throttle Speed Control Fitting PSL4M5BD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL4M5BD |
|---|---|
| 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 PSL4M5BD
| 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 PSL4M5BD Is Used
Single-acting spring-return clamp
Throttling the meter-in side on a compact spring-return clamp cylinder lets a small packaging fixture close onto a finished plastic housing gently instead of snapping shut, protecting the cosmetic surface.
Marking pin on a bench press
A single-acting dot-peen or stamping pin driven through an M5 port from a small manifold valve gets a controlled strike speed, so the impression depth stays repeatable across batch runs.
Lab sample dispenser actuator
On a compact analytical or sample-preparation station, the 4mm bore keeps the throttled volume tiny, giving fine speed control for a short-stroke dosing or lifting movement without lag.
Is the Airtac PSL Throttle Speed Control Fitting PSL4M5BD the Right Part?
This is the smallest pneumatic footprint AirTAC publishes in the PSL ladder: Dia 4 is the bottom of the tube range and M5 is the finest thread on it. There is no size below it, so the only step available on the M5 thread is up to the PSL6M5B, which raises the bore for circuits that need a little more air path volume around small cylinders. Keep the controller mounted directly at the cylinder port so only the small trapped volume between controller and actuator is throttled - the response stays crisp.
If your cylinder is double-acting, prefer the meter-out A version of the same size instead; the back-pressure it builds on the exhaust keeps the stroke smooth. If you need a tube that can rotate to line up with cramped plumbing, move to the PSS universal body. And remember this family does not shut a circuit off: a speed controller closed fully still weeps slightly by design, so use a PHV finger valve where isolation matters.
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 PSL4M5BD FAQ
It is an AirTAC PSL speed controller in the black D colour variant, with a Dia 4mm tube outlet and an M5 thread port, B control (meter-in). Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates negative pressure down to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the temperature range is -20 to +70 C. It is intended for soft nylon or polyurethane tubing, and the thread standard is PT.
No. A PSL speed controller is a flow restrictor, not an isolation valve, and it is designed to leak slightly when fully closed, so it must never be relied on to hold a circuit off. For a manual shut-off with venting or non-venting behaviour, specify the AirTAC PHV finger valve instead - PHVA vents the outlet port when closed, PHVB does not.
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