Airtac PSL Throttle Speed Control Fitting PSL803AD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL803AD 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 PSL803AD
The PSL803AD is a threaded speed controller that sets how fast an actuator moves by throttling air in one direction while letting it pass freely the other way. In this A-suffix code the control is meter-out: flow from the 3/8in PT thread port into the Dia 8 tube is restricted by a brass throttling column, while the return path runs wide open. AirTAC treats meter-out as the first-priority choice because restricting the exhaust of a double-acting cylinder leaves a back-pressure cushion, so the stroke stays smooth instead of sticking and slipping under a changing load. The handle carries an A marking so the flow direction is visible on the machine.
The body threads straight into the port and the tube pushes into a fixed one-touch socket, so plan your piping around the tube direction before you install. Adjustment is a black knob (the D suffix means black instead of the standard grey) backed by an aluminium locking cap: set the speed, then screw the cap down so vibration cannot drift the setting. Wetted materials include brass for the throttling column and body, PBT plastic for the body holder, an NBR O-ring and a POM interface, all rated 0-1.0 MPa working pressure from -20 to +70 C.
Airtac PSL Throttle Speed Control Fitting PSL803AD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL803AD |
|---|---|
| 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 PSL803AD
| 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 PSL803AD Is Used
Conveyor indexing pusher
A Dia 8-fed push cylinder that kicks cartons across a conveyor belt can be tuned with the PSL803AD so each index lands in sync with the belt timing instead of hammering the product sideways.
CNC chip-clearing blow-off slide
On a machining cell where an air-slide retracts the blow-off nozzle, meter-out control smooths the return stroke so the nozzle does not whip back and snag on the fixture.
Palletiser case hold-down
A hold-down cylinder pressing corrugated cases before strapping needs a controlled descend speed; the locking cap on the PSL803AD keeps that setting through a full shift of vibration.
Is the Airtac PSL Throttle Speed Control Fitting PSL803AD the Right Part?
Pick the PSL803AD when your actuator port takes 3/8in PT thread and the run uses Dia 8 soft nylon or polyurethane tubing, and you want exhaust-side (meter-out) control of a double-acting cylinder. On the 3/8in ladder the neighbouring bores are Dia 6 (PSL603AD) and Dia 10 (PSL1003AD): stepping down to Dia 6 tightens the throttling range for small, fast cylinders, while Dia 10 suits larger bores that need more free-flow area around the needle. If your thread instead is 1/4in or 1/2in, the same Dia 8 tube exists as PSL802AD and PSL804AD.
If you would rather have the tube socket swivel 360 degrees during installation, the PSS universal series offers Dia 8 in 1/4in and 1/8in, not 3/8in, so check that before switching. Mount the controller directly at the cylinder port rather than back at the valve bank: the throttled air volume is then only the short stub between controller and actuator, which gives finer, more repeatable speed adjustment.
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 PSL803AD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and a temperature range of -20 to +70 C. This SKU takes Dia 8 soft nylon or polyurethane tube on a 3/8in PT thread, is an A-type meter-out controller, and comes in black (D suffix).
No. A speed controller is a flow regulator, not a shut-off valve: even fully closed it is designed to leak slightly, so a load will eventually creep. Use a dedicated shut-off such as an AirTAC PHV finger valve when you need to isolate a circuit, and keep the PSL803AD for speed setting. Note also that it contains no built-in silencer; exhaust muffling is a separate accessory.
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