Airtac PSL Throttle Speed Control Fitting PSL12-03B
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL12-03B 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 PSL12-03B
The PSL12-03B is AirTAC's largest-body threaded speed controller at this port size, built for Dia 12mm soft nylon or polyurethane tube and a 3/8in PT male port. Like every PSL, it throttles air in one direction and lets it run free in the other, so you can slow an actuator without bleeding speed from the whole circuit. This code carries the B suffix, which makes it a meter-in controller: flow from the thread port to the tube runs free, while flow travelling back from the tube to the port is throttled by the handle marked B.
Meter-in is AirTAC's recommended pairing for single-acting cylinders, where air enters only one side and the spring or load returns the rod. Restricting the supply side gives you a controlled, gradual power stroke instead of a jump. Adjustment is by a rotating knob with an aluminium locking cap - after setting the stroke speed, tighten the cap down so vibration on a large-bore 12mm line cannot drift the setting. The tube direction on a PSL body is fixed, unlike the PSS universal version which swivels 360 degrees, so plan your tubing run before you order.
Airtac PSL Throttle Speed Control Fitting PSL12-03B Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL12-03B |
|---|---|
| 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 PSL12-03B
| 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 PSL12-03B Is Used
Spring-return clamp cylinders
On a single-acting clamp cylinder closing onto a machined or painted face, this meter-in controller lets you meter the supply so the pad settles onto the surface gently instead of marring it.
Press-feed kick cylinders
A single-acting kick cylinder that advances a blank into a press station can be slowed with the PSL12-03B, so operators can time the feed to the press cycle by turning the knob.
Pneumatic lift assist jigs
Single-acting lifting rams in assembly jigs benefit from a controlled up-stroke on 12mm lines, where a free-flying rod would shake the fixture and the locking cap keeps the setting put.
Is the Airtac PSL Throttle Speed Control Fitting PSL12-03B the Right Part?
Match the control method to the actuator first: meter-out (A codes) is AirTAC's stated first priority for double-acting cylinders driven by a solenoid valve, because throttled exhaust creates a back-pressure cushion that keeps the stroke smooth. This B-code meter-in part is the right choice for single-acting cylinders; using meter-in on a double-acting cylinder invites stick-slip under changing load. On body size: at 3/8in thread, Dia 12 is the largest tube AirTAC makes for the PSL prefix - there is no step up at this port, so this is the ceiling of the ladder. One step down, PSL10-03B takes Dia 10 tube on the same 3/8in port; if your line is smaller, step to it rather than reducing a 12mm hose. If you need 12mm tube on a bigger port, the 1/2in PSL12-04B exists instead. Whichever you choose, fit the controller directly at the cylinder port so the volume of air being throttled stays small and the 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 PSL12-03B FAQ
It is a PSL series meter-in (B) speed controller for Dia 12mm tube with a 3/8in PT male thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure is 1.5 MPa, negative pressure is -750 mmHg (10 Torr), and the working temperature range is -20 to +70 C. It suits soft nylon or polyurethane tubing. A stainless -S variant with a SUS304 throttling column is available on the same ratings.
No. A speed controller like the PSL12-03B leaks slightly when fully closed by design, so it must never be used to isolate a circuit. If you need to vent or lock a line, use a dedicated shut-off valve - AirTAC's PHV finger valve is the shut-off product in this family, and it is a quarter-turn valve, not a throttle.
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