Airtac PSL Throttle Speed Control Fitting PSL8-03B
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL8-03B 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 PSL8-03B
The AirTAC PSL8-03B is a speed controller that sets actuator speed by throttling air in one direction while letting it pass freely in the other. This is the B code, so it is meter-in: air flows free from the 3/8in PT thread port into the Dia 8 tube, and the return path is throttled. AirTAC's own selection guidance points meter-in at single-acting and spring-return actuators, where the cylinder only needs its supply side set - a spring-return clamp that must close gently, for example. On a double-acting cylinder under changing load, meter-in tends to stick-slip, so meter-out (the A code) remains the default there.
Adjustment is a knob with an aluminium locking cap: set the speed by hand, then screw the cap down so vibration cannot drift the setting. The throttling column and body are brass, the body holder is PBT plastic, the seal is NBR, and the interface is POM. The thread is PT taper, so use a sealant tape or paste on the male thread; the Dia 8 tube pushes into the one-touch collet and pulls out after releasing the release ring.
Airtac PSL Throttle Speed Control Fitting PSL8-03B Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL8-03B |
|---|---|
| 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 PSL8-03B
| 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 PSL8-03B Is Used
Spring-return clamp on a packaging line
A single-acting clamp arm closing over filled cartons needs its closing speed set from the supply side, which is exactly what the B meter-in code does - the spring return handles the opening stroke.
Injection-mould ejector knock-off
A small spring-return knock-off cylinder clearing finished parts from an ejector plate must extend gently enough not to mark the moulding; the Dia 8 tube collet suits the compact cylinder body.
Sample lift on a lab automation deck
A light vertical lift raising microplate stacks uses spring return for descent; meter-in control on the rise keeps vials from being jerked, and the locking cap holds the setting between service visits.
Is the Airtac PSL Throttle Speed Control Fitting PSL8-03B the Right Part?
Meter-in (B) is the right control method for single-acting or spring-return actuators driven by a solenoid valve. If your actuator is double-acting, choose the A code instead - throttling the exhaust leaves a back-pressure cushion and keeps the stroke smooth. Choose PSL over PSS when the tube must leave in a fixed direction; PSS is the same throttling function with a 360-degree swivelling tube nut. On this prefix the 3/8in thread carries Dia 6, 8, 10 or 12 tube: step down to PSL6-03B for a lighter cylinder or slower low-flow setting range, step up to PSL10-03B when a Dia 10 line is already plumbed and you want to avoid reducers. One practical rule: mount the controller directly at the cylinder port so the volume of air being throttled stays small and the speed response stays crisp.
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 PSL8-03B FAQ
It is a PSL series meter-in (B) speed controller with Dia 8mm tube on a 3/8in PT thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates negative pressure to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the working temperature range is -20 to +70 C. Applicable tubing is soft nylon or polyurethane; standard colour is grey (order the D suffix for black). The throttling column and body are brass with a PBT holder and NBR seal.
No. A speed controller is designed to leak slightly when fully closed, so it must never be relied on to isolate a circuit. For a positive shut-off, fit a separate AirTAC PHV finger valve, which is a true manual quarter-turn shut-off. Also note that this controller has no built-in silencer - if exhaust noise at the valve is a concern, order a silencer separately.
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