Airtac PSL Throttle Speed Control Fitting PSL6-03B
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL6-03B 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 PSL6-03B
The AirTAC PSL6-03B is a panel-in speed controller for 6 mm outside-diameter tubing with a 3/8in PT male thread. It throttles air in one direction only: on the B (meter-in) code, flow from the 3/8in thread port into the tube runs free, and the return path from tube back to the thread port is throttled. The handle is marked B so the setter can confirm the control direction at a glance on a crowded manifold. Meter-in is the deliberate choice for a SINGLE-ACTING cylinder, where the spring or return force on the exhaust side cannot tolerate a back-pressure cushion.
Adjustment is a knurled knob under an aluminium locking cap: lift, set the stroke speed by hand, then screw the cap down so machine vibration cannot walk the setting. The throttling column and body are brass inside a PBT plastic holder, with an NBR seal. AirTAC rates the whole PSL family at 0-1.0 MPa working pressure, 1.5 MPa proof, -750 mmHg vacuum and -20 to +70 C, so the same part also throttles a light vacuum draw on a pick head.
Airtac PSL Throttle Speed Control Fitting PSL6-03B Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL6-03B |
|---|---|
| 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 PSL6-03B
| 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 PSL6-03B Is Used
Single-acting CNC fixture clamp
On a machining centre fixture, a spring-return clamp cylinder is fed through the 3/8in thread port; the PSL6-03B meters the return so the clamp unclamps at a controlled, repeatable pace instead of snapping open against the chip guard.
Tray-eject pusher on a food packaging line
A single-acting pusher that kicks misaligned trays off a conveyor fills quickly through the free direction and its spring return is throttled, letting the line crew dial the eject stroke to match conveyor pitch without touching the PLC timing.
Vacuum pick head on an electronics feeder
The -750 mmHg (10 Torr) vacuum rating lets the same 6 mm circuit handle a light vacuum draw on a pick-and-place head, with the B control path damping the release puff as suction is broken.
Is the Airtac PSL Throttle Speed Control Fitting PSL6-03B the Right Part?
Confirm your actuator first. Meter-in (this B code) is the right method when air enters through the thread port and the cylinder returns by spring - the classic single-acting arrangement. If your cylinder is double-acting and driven by a solenoid valve, choose meter-out (A suffix, PSL6-03A) instead: throttling the exhaust gives a back-pressure cushion and avoids stick-slip under varying load. Note that with the B code the free direction is thread-to-tube, so the cylinder fills fast and only the controlled return is speeded.
Size the ladder both ways. On the 3/8in PSL thread, Dia 6 is the smallest tube offered - the step up is PSL8-03B on Dia 8, which gives a larger bore for longer lines and higher flow demand, though capacity is published as characteristic curves rather than a Cv. Stepping down means changing thread, not tube: PSL602B keeps Dia 6 on a 1/4in PT thread for smaller valve ports. Fit the controller directly at the cylinder port so the volume being throttled stays small and the speed 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 PSL6-03B 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. It takes Dia 6 mm outside-diameter soft nylon or polyurethane tube on the tube side and a 3/8in PT male thread on the port side. Standard colour is grey; the D suffix variant is black. It is a meter-in (B) speed controller: free from thread to tube, controlled from tube to thread.
With meter-in you throttle the supply into a double-acting cylinder, and the exhausting chamber has no back pressure to cushion the piston. Under a changing load the piston lurches between stick and slip, giving an uneven stroke. AirTAC's own catalogue calls meter-out the first priority for double-acting cylinders driven by a solenoid valve, so pick the A-suffix PSL6-03A for that duty; reserve this B code for single-acting cylinders where a spring or gravity handles the return.
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