Airtac PSL Throttle Speed Control Fitting PSL803A
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL803A 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 PSL803A
The PSL803A is an AirTAC in-line speed controller with a Dia 8mm one-touch tube outlet and a 3/8in PT male thread that screws straight into the port of a valve, cylinder or manifold. Throttle air in one direction and let it pass free in the other, and the actuator it feeds gets a controlled stroke speed instead of a slam. This code ends in A, so it is the meter-out version: flow from the thread port to the tube is throttled, flow back the other way runs free. AirTAC names meter-out as the first priority, because on a solenoid valve driving a double-acting cylinder the throttled exhaust builds a back-pressure cushion and the piston travels smoothly under changing load.
Adjustment is a grey knob with an aluminium alloy locking cap: set the speed, then tighten the cap so vibration on a larger machine cannot drift the setting. The body is brass with a PBT plastic holder, the throttling column is brass, and the seals are NBR. Rated 0-1.0 MPa working, 1.5 MPa proof, -20 to +70 C, and it holds -750 mmHg vacuum if your circuit pulls as well as pushes.
Airtac PSL Throttle Speed Control Fitting PSL803A Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL803A |
|---|---|
| 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 PSL803A
| 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 PSL803A Is Used
Palletiser arm descent control
A box-palletising arm lowered by a Dia 8mm-fed double-acting cylinder needs meter-out cushioning so the layer settles without bounce; the PSL803A throttles the exhaust side while the free-fill direction keeps the return stroke quick.
Carton-sealer flap tucker
On a packaging line, flap-tucking cylinders running off 3/8in valved ports are timed to the belt speed; the locking cap holds the knob against the constant machine vibration that would otherwise loosen an unlocked adjustment.
Weld-fixture clamp close rate
A weldment clamp that closes onto machined steel must not mar the surface; meter-out control on the Dia 8mm line to the clamp cylinder gives a gentle final approach while the unthrottled return keeps cycle time short.
Is the Airtac PSL Throttle Speed Control Fitting PSL803A the Right Part?
Pick meter-out (this A version) for double-acting cylinders fed by a solenoid valve. Pick meter-in (B) only for single-acting actuators, where there is no exhaust side to cushion. Body style matters too: a PSL points one fixed direction, a PSS of the same rating swivels 360 degrees on its thread, and a PSA is a tube-to-tube inline part with no thread at all. If you want the speed setting protected from a knocked elbow, the PTL push-lock in 3/8in uses a press-and-lock cap instead of a knob.
On the 3/8in PSL ladder the neighbours are PSL603A (Dia 6 tube) below and PSL1003A (Dia 10 tube) above; stepping tube size changes the bore, and the achievable flow capacity scales with it, not with the thread. If Dia 8 is right but your port is smaller, the same tube is sold as PSL802A with a 1/4in thread or PSL801A with 1/8in. Mount the controller directly at the cylinder port so only the short stub between controller and piston is throttled - putting it back at the valve throttles the whole line and gives softer, 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 PSL803A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure down to -750 mmHg (10 Torr), ambient and media temperature -20 to +70 C. It is a meter-out (A) knob-type speed controller with a Dia 8mm tube outlet and a 3/8in PT thread port. Body brass, holder PBT plastic, seals NBR, knob and locking cap in aluminium alloy. Use soft nylon or polyurethane tube of 8mm outside diameter.
PT is a taper thread: seal it with a few turns of PTFE tape wound in the tightening direction and hand-start it into the port, then snug it up - it is not a parallel thread and needs no O-ring or gasket. Note that the PSL body points in one fixed direction after fitting; if your routing needs the tube outlet at an angle, the swivelling PSS802A covers Dia 8 tube on a 1/4in thread instead. Remember the knob adjusts speed but does not shut the circuit off - use an AirTAC PHV finger valve where you need a true shut-off.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Speed Controllers
Request a Quote for Airtac PSL Throttle Speed Control Fitting PSL803A
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.