Airtac PSL Throttle Speed Control Fitting PSL601A
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL601A 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 PSL601A
The PSL601A is a one-touch speed controller that sets how fast a pneumatic actuator moves by throttling the air in one direction and letting it pass freely in the other. This is the A, or meter-out, version: flow from the 1/8in PT thread port to the Dia 6 tube is controlled, while the reverse path runs free. AirTAC treats meter-out as the first-choice control method, because throttling the exhaust leaves a back-pressure cushion inside a double-acting cylinder and the stroke stays smooth instead of lunging. The handle is marked A so setters can confirm the control direction at the machine.
The part screws into a 1/8in PT port and accepts 6mm soft nylon or polyurethane tube with a push-fit seal. Speed is set with a knurled knob backed by an aluminium locking cap - tighten the cap and the setting survives vibration and curious fingers. Inside, a brass throttling column meters the flow in a brass body, while the holder is PBT plastic with an NBR O-ring doing the sealing. The tube outlet is fixed on this body; if your layout needs a swivelling outlet, that is the PSS universal version instead.
Airtac PSL Throttle Speed Control Fitting PSL601A Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL601A |
|---|---|
| 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 PSL601A
| 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 PSL601A Is Used
Pick-and-place arm on an electronics gantry
A 6mm-bore controller matched to small vacuum and gripper cylinders stops the Z-axis arm from slamming onto the PCB nest at the end of each descent, with the locking cap keeping the gentle profile after changeovers.
Pneumatic clamp closing on finished panels
Meter-out throttling eases a clamp cylinder onto lacquered furniture panels or polished aluminium sheet without marking the surface, and the 1/8in PT thread drops straight into the ports on compact clamp bodies.
Indexing pusher timed to a packaging conveyor
A carton pusher on a food-packaging line is tuned with the knob so each stroke tracks the conveyor pitch; the free reverse flow returns the cylinder quickly for the next box without retuning.
Is the Airtac PSL Throttle Speed Control Fitting PSL601A the Right Part?
Start from the actuator: double-acting cylinders driven by a solenoid valve should use meter-out like this PSL601A, because the exhaust cushion keeps the piston from stick-slipping under a changing load. Meter-in (the B suffix) is the option for single-acting cylinders. Within the PSL ladder at 1/8in PT, the neighbouring tube bores are Dia 4 (PSL401A) below and Dia 8 (PSL801A) above - a smaller bore suits light pick-and-place loads and tighter cabinets, a larger one feeds heavier slides with less restriction on the free-flow side. The same Dia 6 tube also exists on M5, 1/4in and 3/8in PSL bodies if the port pitch matters more than the bore.
Choose this knob type when technicians re-tune stroke speeds by hand; choose the PTL push-lock version when a setting must not be knocked out of adjustment. Whichever you pick, mount the controller directly at the cylinder port so the throttled air volume stays small and the response to each turn of the knob 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 PSL601A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and an operating temperature range of -20 to +70 C. This SKU takes Dia 6 soft nylon or polyurethane tube on the push-in side and screws into a 1/8in PT thread port. It is the A (meter-out) version in the standard grey finish.
The PSL body screws into the port and the tube socket sits in one fixed orientation, which keeps the part short and cheap. If your manifold port orientation makes the tube approach awkward, use the PSS universal speed controller instead - same meter-out A control logic, but the tube outlet swivels 360 degrees. Do not try to re-orient the PSL by force; the O-ring seal and plastic holder are not designed to be twisted once installed.
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