Airtac PSL Throttle Speed Control Fitting PSL1004B
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1004B 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 PSL1004B
PSL1004B is an AirTAC PSL speed controller sitting at the top of the ladder: Dia 10 mm soft nylon or polyurethane tube on a 1/2in PT threaded port. The B suffix makes it a meter-in unit - air flowing from the thread port out through the tube to the cylinder runs wide open, while flow in the reverse direction is throttled by a brass needle. In practice that means the supply stroke is metered, which is exactly what a single-acting cylinder wants, because its return is driven by a spring and does not need shaping.
Adjustment is a knurled knob under an aluminium locking cap: lift, set the speed, press the cap back down and the setting cannot creep with machine vibration. The throttling column and body are brass inside a PBT plastic holder with an NBR seal. The unit carries AirTAC's standard rating of 0-1.0 MPa working pressure, 1.5 MPa proof pressure and -20 to +70 C, with a -750 mmHg vacuum figure if the circuit ever pulls. Grey is standard; add D to the order code for black.
Airtac PSL Throttle Speed Control Fitting PSL1004B Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1004B |
|---|---|
| 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 PSL1004B
| 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 PSL1004B Is Used
Single-acting clamp on a machining fixture
Throttle the supply stroke so a Dia 10 mm spring-return clamp cylinder closes progressively onto a finished machined face, then let the spring snap the jaw back through the unthrottled direction.
Single-acting stamping marker
On a press-side marking head, meter-in control slows the punch as it enters the die so the impression is crisp rather than hammer-blurred, while the spring return stays free.
Vertical lift ram on an assembly jig
A single-acting ram raising a locating pin gets a metered rise on the supply side, and the weight-assisted drop passes straight through the free direction without damping.
Is the Airtac PSL Throttle Speed Control Fitting PSL1004B the Right Part?
Meter-in (B) suits a single-acting cylinder or a rigidly guided actuator with a consistent light load. If a solenoid valve is driving a double-acting cylinder, AirTAC's own guidance is that meter-out is the first priority - throttling the exhaust leaves a back-pressure cushion that keeps the stroke smooth - so pick the A version of the same size instead. Within the 1/2in PT port size the PSL ladder steps down to Dia 8 (PSL804B) and up to Dia 12 (PSL1204B); Dia 12 is the largest tube this prefix offers, so PSL1204B is the ceiling of the range. Each step changes how fast a given stroke volume fills through the controlled orifice, so match the bore to the cylinder's air demand. If the fitting must swivel after installation, the PSS universal body does that where the PSL's tube direction is fixed. Screw the controller directly into the cylinder port so the throttled volume stays small and 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 PSL1004B FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa and a temperature range of -20 to +70 C. This SKU takes Dia 10 mm soft nylon or polyurethane tube on a 1/2in PT tapered thread, and the B suffix means flow is controlled meter-in.
PT is a taper thread, so wrap PTFE sealant tape on the male thread before screwing into the valve or cylinder port, and hold the wrench on the metal rather than the PBT body. Be aware that fully closing this controller does not isolate a circuit - it is a throttle, not a shut-off valve, and a trace of leakage past the fully closed needle is by design. For positive isolation use a dedicated shut-off such as the PHV finger valve.
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