Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A-S
SUS304 stainless variant (-S)The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A-S 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 PSS802A-S
The PSS802A-S meters air leaving your valve and flowing out through the tube, so a double-acting cylinder exhausts against a controlled back-pressure cushion. That cushion keeps the stroke smooth under varying load, which is why AirTAC names meter-out as the first-priority control method. The A suffix marks it meter-out: flow from the 1/4in PT thread port into the Dia 8 tube is throttled, and the return path runs free. The knob carries an A marking so the setting direction is obvious at the panel.
The -S suffix changes the internals that the air actually works against: the throttling column is SUS304 instead of brass, with the throttling body in aluminium alloy or SUS304 depending on the part. Pressures, temperatures and dimensions are identical to the standard PSS802A. As a PSS universal type, the tube side swivels 360 degrees, so you can align the knob with the service position without twisting the polyurethane or soft nylon tubing.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A-S Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A-S |
|---|---|
| Type | Universal speed controller |
| Series | PSS |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | 360 degree adjustable 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 PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A-S
| 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. |
| -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 PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A-S Is Used
Wash-down bottling line clamps
Guiding clamps on a rinse-and-fill carousel get hosed down each shift, so the SUS304 throttling column resists the wet environment that pits a brass column. Meter-out keeps each bottle clamp closing at the same gentle rate.
Marine hatch and wiper actuators
Deck machinery in salt-laden air eats brass internals; the stainless column in the PSS802A-S extends service life on hatch closers and wiper arms driven by Dia 8 tubing from a 1/4in PT circuit.
Plating line lift stations
Fume-laden electroplating hoists corrode copper alloys and copper contamination in the bath chemistry matters. The stainless throttling column suits the controlled lowering speed these lift stations need.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A-S the Right Part?
Choose meter-out (A) if a solenoid valve drives a double-acting cylinder and the load changes during the stroke - the exhaust-side back-pressure prevents stick-slip. Meter-in (B) is the better match for a single-acting cylinder. A PSS knob with a locking cap is the fastest type to re-set by hand; if operators keep disturbing your settings, a PTL or PTS push-lock cap resists knocks better. Against the PSL fixed-body equivalent, this PSS buys you the swivelling tube union, useful where the knob must face outward on a crowded manifold.
At Dia 8 on a 1/4in PT thread, this SKU sits mid-ladder: step down to the PSS602A-S (Dia 6) for lighter cylinder volumes, or up to the PSS1002A-S (Dia 10) where the larger bore feeds a bigger actuator. On the same Dia 8 tube, the PSS801A-S offers the smaller 1/8in thread if your port drilling differs. Fit the controller directly at the cylinder port so only the small cylinder volume is throttled and 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 PSS802A-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2); negative pressure down to -750 mmHg (10 Torr); proof pressure 1.5 MPa; operating temperature -20 to +70 C. The part takes Dia 8 mm soft nylon or polyurethane tubing on a 1/4in PT male thread and is the meter-out (A) version. Its SUS304 throttling column carries exactly these same ratings as the standard PSS802A - stainless changes the material, not the figures.
It swaps the brass throttling column for SUS304, with the throttling body in aluminium alloy or SUS304 and a stainless spring gasket. The adjustment knob, locking cap, A/B control logic and every dimension stay the same as the standard part, so you can substitute it in an existing PSS802A position without changing tubing or drillings. Note that the stainless option is aimed at corrosion resistance and copper-free internals; no separate food or medical certification is published for it.
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