Airtac PSL Throttle Speed Control Fitting PSL801AD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL801AD 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 PSL801AD
The PSL801AD is an AirTAC PSL speed controller that screws into a 1/4in PT port and grips 8mm outside-diameter tubing in its one-touch collet. Air flowing from the thread port out to the tube is throttled by a tapered brass column; air returning the other way passes through a check path almost unrestricted. The handle carries an A marking, so a technician can confirm meter-out orientation on the machine without checking a datasheet.
This code is the D variant, supplied in black rather than the standard grey, which suits dark machine frames and control cabinets where grey hardware stands out. Adjustment is by an aluminium-alloy knob with a locking cap: set the stroke speed by hand, then screw the cap down so vibration cannot drift the setting. The body combines a brass throttling column and body with a PBT holder and NBR seals, rated 0 to 1.0 MPa and -20 to +70 C.
Airtac PSL Throttle Speed Control Fitting PSL801AD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL801AD |
|---|---|
| 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 PSL801AD
| 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 PSL801AD Is Used
Clamping finished appliance panels
A 1/4in-ported clamp cylinder pressing a rubber pad onto a painted or powder-coated panel needs a gentle final approach. PSL801AD throttles the extend stroke so the pad settles onto the surface instead of marking it, then lets the fast retract pass freely to keep cycle time short.
Pick-and-place lowering of glass sheets
On a glass-handling gantry, the down stroke must ease the sheet onto a vacuum table without a bounce. The meter-out A action holds a cushion under the descending load, and the aluminium locking cap keeps the setting put through thousands of vibration-filled cycles.
Indexing pusher on a carton line
A pusher cylinder that kicks cartons across a conveyor between chain flights must complete its stroke inside the gate window. Fitting this controller at the cylinder port meters the exhaust so the push is timed and damped, preventing cartons from overshooting the lane guide.
Is the Airtac PSL Throttle Speed Control Fitting PSL801AD the Right Part?
Meter-out (A) is AirTAC's default recommendation: throttling the exhaust of a double-acting cylinder builds a back-pressure cushion, so the load cannot run ahead of the air and the stroke stays smooth. Meter-in is the choice for single-acting cylinders; fitting this A-code part to a meter-in circuit wastes its advantage. For 8mm tube on a 1/4in port, the neighbouring bores in this thread are Dia 6 (PSL602A) and Dia 10 (PSL1002A) - stepping up raises capacity for longer strokes or heavier loads, stepping down suits compact actuators and short runs. The same 8mm tube is also stocked on 1/8in (PSL801A) and 3/8in (PSL803A) threads if your porting differs. Mount the controller directly at the cylinder port so only the short stub of tubing holds compressed air - throttling a long line far from the actuator gives sluggish, less repeatable 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 PSL801AD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU takes Dia 8 mm soft nylon or polyurethane tubing, threads into a 1/4in PT port (02 in the order code), is a meter-out A type, and comes in black (D suffix). The brass throttling column sits in a PBT and aluminium-alloy body with NBR seals.
No. A speed controller is a flow throttle, not an isolation valve - even fully closed it is designed to weep slightly, so a parked load will creep over time. Use it to set stroke speed and, if you need to lock out a section of the circuit for service, add an AirTAC PHV finger valve, which is a true manual shut-off.
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