Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD is a genuine universal speed controller with knob with aluminium-alloy locking cap and 360 degree adjustable tube direction, used to set the speed of a pneumatic cylinder by throttling its air.
- TypeUniversal speed controller
- SeriesPSS
- 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 PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD
The PSS602AD is a universal speed controller: a one-way needle that throttles air flowing out of the 1/4in PT thread port and into the Dia 6 tube, while air travelling the opposite way passes through an internal check path unrestricted. The A in the code marks meter-out control. AirTAC treats meter-out as the first-choice method because throttling the exhaust of a double-acting cylinder leaves a back-pressure cushion, so the stroke stays smooth instead of lunging or stick-slipping.
What separates the PSS from the fixed-direction PSL is the body: it swivels a full 360 degrees on the thread, so you can aim the Dia 6 tube and the adjusting knob wherever the machine layout needs them without re-plumbing the port. The D suffix means the body is black rather than the standard grey. Internals are a brass throttling column and body with a PBT holder, NBR O-ring and POM sealing faces, and the knob sits under an aluminium locking cap that holds the setting once you screw it down.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD |
|---|---|
| Type | Universal speed controller |
| Series | PSS |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | 360 degree adjustable 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 PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD
| PSS | Universal speed controller. |
|---|---|
| 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 PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD Is Used
Rotary actuator on a camera bracket
An inspection station swings a vision camera through 90 degrees with a compact rotary actuator fed by Dia 6 tubing. Meter-out damping stops the bracket snapping at the end of travel, and the swivel body lets the knob face the service side of the bracket.
Dosing head in a lab filler
A small dispensing cylinder pushes micro-volumes of reagent; a stroke that slams splashes the sample. The Dia 6 outlet and gentle exhaust throttle give the operator a slow, repeatable down-stroke without touching the valve timing.
Indexing pusher in a tight manifold
On a compact packaging machine the cylinder port points the wrong way for hand access. Because the PSS body rotates on the 1/4in thread, the pusher's speed can be tuned from the front of the manifold without loosening a fitting.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD the Right Part?
Step sizes matter on a dense ladder like this. At 1/4in thread the PSS range runs Dia 6, Dia 8 and Dia 10, so the next step up from this part is Dia 8 (PSS802A) - a bigger bore swings a larger free-flow volume, which suits a heavier actuator but gives you coarser control near closed. There is no Dia 4 option at 1/4in on the PSS; Dia 4 exists only with the M5 thread, so if you need that bore you change thread too. Keep to the B (meter-in) suffix only for single-acting cylinders, and fit the controller directly in the cylinder port so the throttled volume stays small and the 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 PSS Exhaust Throttle Type Universal Speed Control Valve PSS602AD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable under vacuum to -750 mmHg (10 Torr), and an operating temperature of -20 to +70 C. This code is meter-out (A), black body (D), for Dia 6 soft nylon or polyurethane tube on a 1/4in PT thread. Proof pressure of 1.5 MPa means the part survives 50 percent over its working ceiling, which is worth knowing when a valve dumps a trapped surge.
No, on both counts. A speed controller leaks slightly when screwed fully closed by design, so it must never be used to isolate a circuit - that is the job of the PHV finger valve. It also has no built-in silencer; if exhaust noise matters, fit a separate silencer at the valve exhaust port rather than expecting the needle to muffle anything.
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