Airtac PSL Throttle Speed Control Fitting PSL1204AD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1204AD 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 PSL1204AD
The PSL1204AD is a Dia 12mm speed controller with a 1/2in PT male thread, finished in black per the D colour suffix. It sets actuator speed by throttling air in one direction while the other direction runs free, and this code is meter-out (A): flow from the 1/2in thread port into the tube is restricted, so it fits the exhaust leg of a double-acting cylinder and builds a back-pressure cushion that keeps the stroke smooth instead of stick-slipping.
The aluminium locking cap on the knob lets you clamp the setting once the machine is timed, so production staff cannot knock the stroke speed out of adjustment day to day. The body is brass with a PBT holder and NBR seals; the 1/2in thread is PT taper form and seals with thread tape or paste.
Airtac PSL Throttle Speed Control Fitting PSL1204AD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1204AD |
|---|---|
| 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 PSL1204AD
| 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 PSL1204AD Is Used
Palletising gantry descent
A palletiser arm lowering a full layer of cartons onto a stack at the end of the line; meter-out throttling on the down-stroke prevents the load free-dropping and jolting the frame.
Transfer press clamp
A large pneumatic clamp closing on sheet-metal blanks in a stamping cell; meter-out control lets the tool close firmly onto the part without slamming the finished surface.
Filling line indexing
A rotary indexing table feeding bottles along a filling conveyor; the 1/2in port meters the exhaust so each index move lands on the same timed beat as the capper.
Is the Airtac PSL Throttle Speed Control Fitting PSL1204AD the Right Part?
Confirm the control method first. A (meter-out, this code) is AirTAC's stated default and suits any double-acting cylinder driven by a solenoid valve; B (meter-in, sold as PSL1204BD) suits single-acting cylinders better. At the 1/2in thread size the PSL ladder runs Dia 8, Dia 10 and Dia 12 - stepping down to the PSL1004A narrows the controlled bore and slows the flow path for a smaller actuator, while the PSL1204A is the top of this thread's ladder, so no larger Dia exists on a 1/2in PSL. If the tube needs to swivel at the port, the PSS1204A is the same sizing with a 360-degree body; if adjustments get knocked, the PTL1204 push-lock cap resists that better than a knob. Fit the controller directly at 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 PSL1204AD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure -750 mmHg (10 Torr), temperature -20 to +70 C. This SKU is a Dia 12mm tube speed controller with a 1/2in PT thread, meter-out (A) control, black (D) finish. Applicable tubing is soft nylon or polyurethane, and flow is published as characteristic curves rather than a single flow figure.
No. A speed controller is not an isolation valve - even fully closed it is designed to leak slightly, and AirTAC's catalogue gives shut-off duty only to the PHV finger valve family. Use the PSL1204AD purely to set cylinder speed by throttling one direction of flow; for a proper stop-and-isolate point on a 1/2in line, specify a separate shut-off valve.
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