Airtac PSL Throttle Speed Control Fitting PSL1203BD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1203BD 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 PSL1203BD
The PSL1203BD is a large-bore AirTAC speed controller that sets how fast an actuator moves by throttling air in one direction and letting it run freely in the other. This code carries the B suffix, so it is a meter-in controller: air flowing from the 3/8in PT thread port out to the Dia 12 tube is throttled, while the return path runs unobstructed. The handle is marked B so panel staff can confirm the control mode at a glance. AirTAC positions meter-in as the correct match for single-acting cylinders, where the return spring, not trapped back-pressure, retracts the piston.
Adjustment is a knob on an aluminium locking cap with a brass throttling column inside a PBT holder; once the speed is set, the cap locks it against vibration and tampering. The D suffix specifies the black version. Dia 12 is the largest tube size AirTAC offers on the PSL 3/8in ladder, so this part feeds the heaviest loads in the family.
Airtac PSL Throttle Speed Control Fitting PSL1203BD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1203BD |
|---|---|
| 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 PSL1203BD
| 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 PSL1203BD Is Used
Sawmill hold-down clamp
A hydraulic-style pneumatic hold-down clamping timber against a saw bed can be slowed on its power stroke with this meter-in controller, since the single-acting spring return needs no throttled cushion on the way back up.
Scrap-conveyor gate actuator
A heavy slide gate that diverts offcuts on a woodworking or recycling conveyor benefits from the Dia 12 free bore, giving the gate a firm controlled stroke without starving the large cylinder volume.
Press-feeder push arm
On a metal-stamping cell where a single-acting pneumatic arm pushes blanks into a die, this black-body controller lets the setter dial the approach speed by knob and lock it so shift changeovers do not disturb the setting.
Is the Airtac PSL Throttle Speed Control Fitting PSL1203BD the Right Part?
Match the control method to the actuator before matching the size. For a single-acting cylinder, meter-in is right and this B code fits. For a double-acting cylinder driven by a solenoid valve, choose the meter-out PSL1203AD instead - throttling the exhaust builds a back-pressure cushion that keeps the stroke smooth, while meter-in on a double-acting piston tends to stick-slip as the load changes. Note that the A and B markings sit on the handle, so it is easy to verify the direction on the installed part.
On the size ladder, the step down from this SKU is Dia 10 at the same 3/8in thread (PSL1003BD); there is no larger tube at this thread, though Dia 12 also exists on a 1/2in thread (PSL1204B) if your port allows. Larger bore means more free-flow capacity for big cylinders, not a higher pressure rating - the rating is identical across the ladder. Fit the controller directly at the cylinder port so only the short stub of tubing is throttled; the further away it sits, the larger the trapped volume and the coarser the speed control.
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 PSL1203BD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is the meter-in (B) version with a Dia 12 tube outlet and a 3/8in PT thread inlet, finished in black (D suffix).
Meter-in control feeds throttled air into a chamber whose opposite side is venting freely, so a changing load makes the piston surge and stall. AirTAC's own guidance puts meter-out first for double-acting cylinders because throttling the exhaust keeps a back-pressure cushion in the return chamber. Swap to the PSL1203AD meter-out version for that circuit and keep this B-type for single-acting cylinders.
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