Airtac PSL Throttle Speed Control Fitting PSL8-01B
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL8-01B 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 PSL8-01B
The PSL8-01B is an AirTAC PSL series speed controller: a threaded needle valve body that screws into a 1/8in PT port and grips Dia 8mm soft nylon or polyurethane tubing in a fixed one-touch outlet. The B suffix makes this a meter-in type - air passing out of the tube toward the thread port is throttled by the brass needle, while the opposite path runs free. AirTAC treats meter-out as the default choice, but meter-in is the right call on a single-acting cylinder, where speed is set by restricting the supply instead of building exhaust back-pressure.
Adjustment is a knurled knob under an aluminium locking cap: loosen the cap, set the stroke speed by hand, retighten and the setting stays put under machine vibration. Unlike the PSS universal type, the PSL body is fixed - the tube points one way - and the brass throttling column and body sit inside a PBT plastic holder with an NBR O-ring sealing the interface. Note that fully closing the knob does not make this a shut-off valve; a speed controller is designed to weep slightly at the closed stop, so isolate the circuit elsewhere.
Airtac PSL Throttle Speed Control Fitting PSL8-01B Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL8-01B |
|---|---|
| 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 PSL8-01B
| 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 PSL8-01B Is Used
Spring-return clamp on a saw station
A single-acting clamp holds aluminium extrusion against a stop before cutting. Meter-in control on the 1/8in supply line lets the operator set a firm but non-marking closing speed on the finished face.
Kick cylinder on a bottle ejector
A single-port pusher nudges off-spec bottles off a conveyor lane. The Dia 8 bore feeds the ram and the meter-in knob is tuned once, then locked, so every reject push matches the lane timing.
Sample probe lowering rig
A light single-acting cylinder lowers a sampling probe into a test bath. Restricting the supply with the PSL8-01B gives a controlled descent, and the locking cap keeps the lab technician's setting between shifts.
Is the Airtac PSL Throttle Speed Control Fitting PSL8-01B the Right Part?
Choose B (meter-in) when your actuator is single-acting - a spring-return clamp, an air bellows, a single-port ram. For a double-acting cylinder driven by a solenoid valve, step back to the A suffix (PSL8-01A) so exhaust throttling cushions the stroke. Sizing the ladder: one step down on the same 1/8in thread is Dia 6 (PSL6-01B); Dia 8 is already the largest bore this thread offers, so for bigger tubing move up to PSL10-02B on a 1/4in thread. A wider bore carries more free flow at the same knob setting, so expect to re-adjust after any size change.
Mount the controller directly in the cylinder port rather than back at the valve manifold - the throttled air volume stays small and the speed response is far more repeatable. This knob type needs no torque figure; hand-set only. If your line needs a stainless throttling column for wash-down or copper-free duty, the same code with a -S suffix swaps the column to SUS304 without changing any rating.
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 PSL8-01B FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable under negative pressure down to -750 mmHg (10 Torr), and a fluid and ambient temperature range of -20 to +70 C. This SKU is the Dia 8mm tube size with a 1/8in PT male thread, B (meter-in) control. It suits soft nylon or polyurethane tubing and uses an NBR O-ring seal. AirTAC publishes flow only as characteristic curves, not as a fixed Cv or L/min figure.
Pick the B meter-in type for single-acting cylinders, where there is no exhaust to cushion and speed must be set by restricting the incoming air. Pick the A meter-out type for double-acting cylinders on a solenoid valve: throttling the exhaust leaves back-pressure that keeps the stroke smooth and stops stick-slip under varying load. AirTAC's own guidance names meter-out as the first priority wherever the actuator allows it. Also remember the PSL outlet is fixed in one direction - if you need the tube to swivel 360 degrees after installation, the PSS range is the matching body.
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 PSL8-01B
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.