The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B-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.
The PSS1203B-S is a SUS304 stainless universal speed controller that takes Dia 12 soft nylon or polyurethane tubing on a 3/8in PT thread. It throttles air in one direction to set actuator speed and lets it pass freely the other way. The B suffix means meter-in: flow from the thread port out to the tube runs uncontrolled, while air returning from the tube to the port is throttled. AirTAC names meter-out as the default, but meter-in is the correct pick for a single-acting cylinder, where there is no exhaust side to cushion the stroke.
Where the fixed-body PSL points one way only, this universal PSS tube joint swivels 360 degrees after the thread is tightened, so the tubing can be aimed around a crowded manifold without breaking the seal. Speed is set by hand on a knob and held by a locking cap, so hose-down spray and machine vibration will not walk the setting. The -S build replaces the brass throttling column with SUS304, which suits copper-free electronics and plating installations and shrugs off corrosive wash-down media. The handle is marked B so the controlled direction stays readable at a glance.
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1203B-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.
| 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. |
Electroplating cells ban brass because copper ions poison the bath chemistry. The SUS304 column in this controller keeps the single-acting lift ram's descent speed settable without contaminating the solution.
A Dia 12 bore has the capacity to feed a stopper cylinder that halts cartons on a food-line conveyor. The locked knob holds its setting through the daily caustic hose-down.
Salt-laden air destroys brass throttling columns. The stainless body controls the closing speed of a hatch damper cylinder, and the 360-degree swivel union lets the tube run clear of a tight bulkhead.
Dia 12 is the largest bore the PSS ladder offers on a 3/8in thread; the only smaller sibling on this thread is the Dia 10 PSS1003B-S, which gives a finer throttle range for lighter cylinders. If your port is 1/2in, step up to the PSS1204B-S - same Dia 12 tube, bigger thread. Prefer an A-coded meter-out version over this B code when the controller feeds a double-acting cylinder from a solenoid valve: throttling the exhaust leaves a back-pressure cushion and the stroke stays smooth under changing load, while meter-in on that circuit tends to stick-slip. Whichever you choose, fit the controller directly at the cylinder port so the throttled volume stays small and response stays crisp.
Quick checklist
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa and a temperature range of -20 to +70 C. This SKU accepts Dia 12 soft nylon or polyurethane tubing on a 3/8in PT thread and controls flow in the meter-in (B) direction, marked on the handle.
No. The -S variant keeps the identical 0-1.0 MPa working envelope and the same dimension table as the standard PSS1203B; only the throttling column material moves from brass to SUS304. AirTAC publishes no separate stainless pressure, finish or corrosion-class figures and no food or medical certification for it - buyers choose -S for corrosion resistance and copper-free construction, not for a higher rating.
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