Airtac PSL Throttle Speed Control Fitting PSL603AD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL603AD 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 PSL603AD
The PSL603AD is a knob-adjusted speed controller that throttles air in one direction and lets it pass freely in the other, so you set an actuator's stroke speed without changing its force. The A suffix makes this a meter-out unit: flow from the 3/8in PT thread port to the Dia 6 tube is controlled, and the return flow runs unthrottled. Meter-out is AirTAC's first-priority arrangement because throttling the exhaust leaves a back-pressure cushion in a double-acting cylinder, which holds the stroke smooth instead of letting it judder under a changing load.
The body is the fixed-direction type: it screws straight into the component port and the Dia 6 tube points away from it, with no swivel - if you need the tube to rotate, that is the PSS universal series instead. Adjustment is a grey-handled knob (this D suffix version is black) with an aluminium locking cap, so once the speed is right you cap it down and it stays set through vibration. Inside are a brass throttling column and brass body with a PBT holder and NBR seal. Note that like every speed controller in this family it is not a shut-off - it weeps slightly when fully closed - so use a PHV finger valve where you need true isolation.
Airtac PSL Throttle Speed Control Fitting PSL603AD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL603AD |
|---|---|
| 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 PSL603AD
| 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 PSL603AD Is Used
Pick-and-place arm deceleration
On a gantry pick-and-place unit with Dia 6 air lines, meter-out throttling at the cylinder port stops the arm slamming into its end stop, and the locking cap holds the tuned stroke through a full production shift.
Indexing pusher on a conveyor
A pneumatic pusher that indexes cartons onto a moving belt needs a repeatable cycle time; the 3/8in port drops straight into the cylinder head and the knob sets the extension speed to match conveyor pitch.
Gentle clamp on a finished panel
A clamp closing onto a polished or lacquered surface is set with meter-out control so the exhaust-side back pressure eases the jaw down instead of letting it strike the finish at full line speed.
Is the Airtac PSL Throttle Speed Control Fitting PSL603AD the Right Part?
Sizing both ways: on the 3/8in thread, Dia 6 is the smallest tube this body takes - there is nothing below it on this thread - and stepping up to Dia 8 (PSL803A) gives you a larger bore for circuits where the free-flow direction should not restrict a bigger cylinder. If your thread port is actually 1/4in rather than 3/8in, the Dia 6 tube is also available as PSL602A, which saves machining a larger tapped hole. Meter-out (A) suits a solenoid valve driving a double-acting cylinder; for a single-acting spring-return actuator, meter-in (B) is the better match. Fit the controller directly at the cylinder port rather than back at the valve: the throttled volume stays small, so the cushion forms quickly and small knob movements give fine speed control.
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 PSL603AD FAQ
This SKU is a meter-out (A) speed controller for Dia 6mm tube on a 3/8in PT thread, in the black D colour. Working pressure is 0 to 1.0 MPa (0 to 10 kgf/cm2), proof pressure is 1.5 MPa, and it also tolerates negative pressure down to -750 mmHg (10 Torr). The working temperature range is -20 to +70 C. Soft nylon or polyurethane tubing is applicable.
Yes - this is a fixed-direction body, not a swivel type. Screw the 3/8in thread into the cylinder port and run the Dia 6 tube outward; the tube cannot rotate relative to the thread. With the A marking, throttling acts on flow going from the thread into the tube, so mount it at the cylinder port you want to cushion - meter-out means you are restricting that chamber's exhaust path back toward the valve when flow reverses, which is what keeps a double-acting stroke smooth.
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