Airtac PSL Throttle Speed Control Fitting PSL801A
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL801A 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 PSL801A
The PSL801A is an AirTAC PSL speed controller with a Dia 8 one-touch tube outlet and a 1/4in PT male thread port. It meters air in one direction and lets it pass freely in the other, so you set how fast an actuator travels without adding a second fitting. The A suffix marks the meter-out version: flow from the thread port into the tube is throttled, flow back out of the tube runs free. Handle marked A.
Meter-out is AirTAC's first-choice method and the default for a reason: with a solenoid valve driving a double-acting cylinder, throttling the exhaust leaves back-pressure on the piston, which cushions the stroke and stops it slamming or sticking-slip when the load varies. Adjustment is a knob with an aluminium locking cap - set the speed, then screw the cap down so vibration cannot move it. The body combines brass and PBT plastic with an NBR seal. One detail worth planning for: PSL is the fixed-direction body, so the tube outlet points where it was installed. If your routing needs the tube to swivel, the PSS 802A universal body covers that instead.
Airtac PSL Throttle Speed Control Fitting PSL801A Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL801A |
|---|---|
| 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 PSL801A
| 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 PSL801A Is Used
Pick-and-place arm descent
On a gantry loader unloading a CNC lathe, the PSL801A meter-out throttle cushions the downward stroke so the gripper lowers parts onto the chuck without a drop-and-bounce finish.
Clamping brushed aluminium panels
A pneumatic clamp pressing finished enclosure panels needs a gentle close to avoid marking the surface; meter-out back-pressure gives a controlled approach speed instead of an impact.
Indexing pusher on a bottling line
Timing a pusher stroke to the gaps on a conveyor is done by turning the locking knob on the 1/4in port controller until the bottle rows enter the lane square, then locking it down.
Is the Airtac PSL Throttle Speed Control Fitting PSL801A the Right Part?
Check your actuator before anything else. Double-acting cylinder fed by a solenoid valve: take meter-out (this A code). Single-acting cylinder: meter-in is the better match - choose PSL801B. On a 1/4in PSL thread the tube ladder runs Dia 6, 8 and 10, so the neighbouring parts are PSL602A (Dia 6) below and PSL1002A (Dia 10) above; stepping up a bore raises the air volume the fitting serves, so pick the tube you are actually running, not the port you happen to have.
Mount the controller directly in the cylinder port rather than at the valve, so the small volume between the throttle and the piston keeps response crisp. Remember this family is a speed controller, not a shut-off: it leaks slightly when fully closed by design, so use a genuine shut-off valve where you need to isolate a circuit.
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 PSL801A FAQ
This is a Dia 8 tube, 1/4in PT thread, meter-out (A) speed controller. Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure down to -750 mmHg (10 Torr), operating temperature -20 to +70 C. It is rated for soft nylon or polyurethane tubing, with a grey body as standard (order PSL801A-D for black).
PSL is the fixed-body version of AirTAC's speed controller family: the one-touch tube outlet points in one direction and the thread port screws into the equipment. If your tubing route needs the outlet to rotate after installation, the PSS universal series offers the same 360-degree swivel on the 1/4in thread - for Dia 8 that is the PSS802A in meter-out form. Both use the same knob-and-locking-cap adjustment; only the body orientation differs.
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