Airtac PSL Throttle Speed Control Fitting PSL601AD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL601AD 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 PSL601AD
The PSL601AD is a meter-out speed controller that screws into a 1/8in PT port and grips Dia 6mm soft nylon or polyurethane tubing. Flow from the thread port out to the tube is throttled by a brass needle column; flow in the reverse direction runs free. Meter-out is the first-priority setting for a solenoid valve driving a double-acting cylinder, because restricting the exhaust leaves a back-pressure cushion so the stroke stays smooth instead of lurching under load. The handle on this code is marked A.
The D suffix makes the body black instead of the standard grey, which helps engineers colour-code meter-out ports on dense manifolds. Adjustment is a knob with an aluminium-alloy locking cap: set the speed, then screw the cap down so vibration cannot drift the setting. The throttling column and body are brass, the holder is PBT plastic and the seal is an NBR O-ring. Rated from -20 to +70 C, the unit also tolerates -750 mmHg vacuum, so it can be used on venturi pick circuits, not just pressure lines.
Airtac PSL Throttle Speed Control Fitting PSL601AD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL601AD |
|---|---|
| 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 PSL601AD
| 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 PSL601AD Is Used
Pick-and-place gripper arm
Dia 6mm tubing is the common feed for compact parallel grippers on electronics assembly robots; meter-out control stops the jaws slamming shut on PCBs and connector housings.
Gentle closing clamp on finished parts
A clamp cylinder lowering onto anodised or polished aluminium faces needs a controlled approach speed. The A meter-out cushion keeps contact pressure gradual so the surface finish is not marked.
Timed indexing pusher on a conveyor
Box transfer pushers between belt sections must extend in step with carton pitch. Throttling the exhaust at the cylinder port with this 1/8in unit sets the stroke time independently of valve speed.
Is the Airtac PSL Throttle Speed Control Fitting PSL601AD the Right Part?
Pick meter-out (this A version) for double-acting cylinders driven by a solenoid valve. Choose a B meter-in code instead if your actuator is single-acting or a spring-return type, since meter-in on a double-acting cylinder under changing load tends to stick-slip. The knob adjusts faster by hand than the push-lock caps on the PTL family; trade that convenience against the locking cap here, which holds its setting better on vibrating machinery.
On the 1/8in thread ladder, this Dia 6mm part sits between PSL401A (Dia 4 tube) below and PSL801A (Dia 8 tube) above. Stepping to Dia 4 narrows the bore and suits shorter runs and small actuators; stepping to Dia 8 moves more volume per metre of tube for larger bores. Mount the controller directly at the cylinder port so the volume being throttled stays small and the speed response is 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 PSL601AD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and an operating temperature range of -20 to +70 C. This SKU is the Dia 6mm tube size with a 1/8in PT thread, in the meter-out A control direction with black body.
No. A speed controller leaks slightly when the needle is fully closed - that is by design, not a defect. For true isolation you need a shut-off valve such as the AirTAC PHV finger valve range. Treat the PSL601AD purely as a speed-setting device: adjust it at the cylinder port, lock the knob cap, and leave it.
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