Airtac PSL Throttle Speed Control Fitting PSL1004BD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1004BD 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 PSL1004BD
The PSL1004BD is an AirTAC PSL series speed controller in black, sized for Dia 10mm soft nylon or polyurethane tubing with a 1/2in PT male thread. It throttles air in one direction and lets it pass freely in the other, so you can set how fast an actuator moves without starving the rest of the circuit. The B suffix on this code means meter-in: flow from the 1/2in thread port out to the tube runs free, while the return path from tube back to thread is controlled. AirTAC marks the handle B so the setting cannot be mistaken for a meter-out unit on a busy manifold.
Meter-in control suits a SINGLE-ACTING cylinder, where air is supplied on one side and a spring or load does the return. Because the controlled flow is upstream of the cylinder, the stroke speed follows the knob directly. AirTAC's own guidance names meter-out as the first priority for double-acting cylinders, so check your actuator before ordering. Adjustment is by a knob with an aluminium locking cap that screws down to hold the setting against vibration, and the internal throttling column and body are brass. Note the PSL body is a fixed port-in, tube-out shape - if your plumbing needs the tube to swivel, the PSS universal version is the equivalent.
Airtac PSL Throttle Speed Control Fitting PSL1004BD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1004BD |
|---|---|
| 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 PSL1004BD
| 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 PSL1004BD Is Used
Spring-return clamping fixture
A single-acting clamp cylinder closing onto a machined aluminium face in a jig is throttled on the supply stroke, so the pad lands gently and the finished surface is not marred. The PSL1004BD's Dia 10 tube feeds a mid-size clamp bore without starving it.
Bench-mounted marking press
A small workshop stamping or marking ram on a single-acting cylinder needs a controlled down-stroke and a free spring return. Meter-in throttling of the supply side gives the operator a repeatable press speed set once behind the locking cap.
Trailer tailgate lift assist ram
A single-acting lift-assist ram on a delivery vehicle tailgate is slowed on the power stroke so the gate lowers with the load instead of dropping. The 1/2in PT thread matches the larger port used on vehicle-mounted actuators.
Is the Airtac PSL Throttle Speed Control Fitting PSL1004BD the Right Part?
Choose meter-in (this B version) if you are driving a single-acting cylinder and want the supply stroke throttled; choose a meter-out A version if a solenoid valve is driving a double-acting cylinder, because exhaust throttling builds a back-pressure cushion that keeps the stroke smooth under changing load. Meter-in on a double-acting cylinder tends to stick-slip. Between knob and push-lock styles: the PSL knob is fast to set by hand during commissioning, while a PTL push-lock cap resists being knocked out of adjustment in daily operation. On the 1/2in PSL ladder this Dia 10 model sits between Dia 8 (smaller bore, lower controlled flow, slower heavy strokes) and Dia 12 (largest in the range, for big-bore cylinders needing more air). Whichever you pick, mount the controller at the cylinder port rather than back at the valve - the throttled volume stays small and the response to every knob turn is immediate.
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 PSL1004BD FAQ
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. This SKU is the Dia 10mm tube size with a 1/2in PT male thread, meter-in (B) control, black finish. It is rated for soft nylon or polyurethane tubing only, and the body carries a fixed port-in, tube-out layout.
No. A speed controller is not a shut-off valve - AirTAC designs the throttling seat to leak slightly when fully closed, so trapped air will bleed down over time. For positive isolation fit a separate shut-off such as the PHV finger valve, which is a true quarter-turn stopcock. Keep the PSL1004BD purely for speed setting: close it nearly shut for a slow stroke, open it for a fast one.
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