Airtac PSL Throttle Speed Control Fitting PSL601A-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL601A-S 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-S
The PSL601A-S is the SUS304 stainless build of AirTAC's PSL601A speed controller. It meters air leaving a 1/8in PT port into Dia 6 one-touch tubing, while the return direction runs wide open. The A suffix is meter-out control: the exhaust path of the actuator is restricted, so a double-acting cylinder builds a back-pressure cushion and the stroke stays smooth instead of stick-slipping under a shifting load. That is why AirTAC names meter-out the first priority in its own catalogue.
Adjustment is a hand knob sitting under an aluminium locking cap - set the speed, then lock it so machine vibration cannot drift the setting. The -S variant replaces the brass throttling column with SUS304 and keeps every published figure identical to the standard part: 0-1.0 MPa working pressure, 1.5 MPa proof pressure, -20 to +70 C. Outside dimensions match too, so it drops straight into an existing PSL601A footprint on a wash-down machine.
Airtac PSL Throttle Speed Control Fitting PSL601A-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL601A-S |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed tube direction |
| Body material | Stainless steel 304 (-S variant) |
| 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. Stainless (-S): SUS304 throttling column and body parts in place of brass, for copper-free environments. Ratings are unchanged from the standard version. 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-S
| 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. |
| -S | Stainless-steel body. |
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-S Is Used
Tray-seal clamp on a wash-down packaging line
A clamp cylinder closing a heated seal head onto filled food trays must decelerate before contact. The SUS304 throttling column tolerates daily hose-down where a brass column would dull, and the locking cap holds the gentle-close setting through shift after shift.
Pick-and-place arm on a labelling machine
The vacuum head lifting glass jars onto a rotary labeller needs a meter-out cushion so the descend stroke settles jars instead of slamming them onto the conveyer table. The fixed PSL outlet suits the short straight hose run typical of these heads.
Lift cylinder on an electroplating jig transport
Plating shops avoid brass in the air path near acid mists. With the brass throttling column replaced by SUS304, this controller meters the rise and fall of jig lifters without adding copper to a corrosive atmosphere.
Is the Airtac PSL Throttle Speed Control Fitting PSL601A-S the Right Part?
Pick meter-out (this A code) when a solenoid valve drives a double-acting cylinder; pick meter-in (PSL601B-S) only for single-acting cylinders, where throttling the supply is the gentler option. The PSL body has a fixed tube outlet - if the hose needs to swivel 360 degrees as the thread is screwed in, step across to the PSS universal body instead. On the 1/8in ladder the neighbouring bores are Dia 4 (PSL401A-S) for compact circuits and Dia 8 (PSL801A-S) for larger actuator ports; stepping bore changes the tubing and fittings you carry, never the pressure rating. Dia 6 also exists on the 1/4in thread rung if your manifold port is bigger. Fit the controller directly at the cylinder port so the throttled volume stays small and reacts at once.
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-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is Dia 6 one-touch tubing into a 1/8in PT thread, A suffix = meter-out control, with a SUS304 throttling column in place of brass. It is intended for soft nylon or polyurethane tubing.
No. A speed controller is a flow-control device, not an isolation valve - a speed controller may weep slightly when fully closed by design, so never rely on one to hold a load or depresurise a circuit. Use AirTAC's PHV finger valve for a true manual shut-off, and lock this controller's knob cap at its working setting instead.
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