Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1204AD-S
SUS304 stainless variant (-S)The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1204AD-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 PSS1204AD-S
The PSS1204AD-S is a universal speed controller that throttles air flowing from its 1/2in PT thread port out through Dia 12 tubing while letting the return flow pass unthrottled. The A suffix marks it as meter-out, the control method AirTAC calls first priority: on a double-acting cylinder driven by a solenoid valve, throttling the exhaust builds a back-pressure cushion so the stroke moves smoothly instead of lunging under a changing load. A knurled knob under an aluminium locking cap sets and holds the orifice.
The PSS body is the swivel member of the PSL family: the threaded port screws into the cylinder or valve face while the tube fitting turns a full 360 degrees, so the tubing can leave at whatever angle the machine needs without twisting or side-loading the hose. In this -S variant the brass throttling column is replaced by SUS304 stainless steel, the throttling body is aluminium alloy or SUS304, and the spring gasket is stainless, removing copper from the wetted path for wash-down, plating and chemically aggressive installations. The D in the code gives it a black body instead of the standard grey.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1204AD-S Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1204AD-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 PSS1204AD-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 PSS1204AD-S Is Used
Plating-line lift cylinders
Dia 12 tubing carries the volume a electroplating hoist cylinder needs, while the SUS304 throttling column survives acid mist that would pit a brass column and contaminate the bath.
Wash-down palletizer pusher
A food-plant palletizer stroking its layer pusher at a controlled rate on every cycle, hosed down daily, with the swivel body letting the 12mm line exit sideways around the guarding.
Marine hatch actuator
A deck-hatch ram on a fishing vessel that must ease the hatch down without slamming, where salt spray rules out brass and the black body hides grime between surveys.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS1204AD-S the Right Part?
Choose the A meter-out direction for double-acting cylinders, where back-pressure on the exhaust side keeps the rod from stick-slipping; reserve a B meter-in code for single-acting spring-return actuators, where metering the supply is correct and there is no exhaust cushion to lose. This code is the largest part in the PSS swivel ladder: at the 1/2in thread AirTAC lists only Dia 12 tubing, so the next step down is PSS1203A, the same Dia 12 tube on a 3/8in thread, or PSS1003A, which drops the tube bore to Dia 10. A smaller bore feeds a smaller cylinder, so its stroke completes sooner at the same supply pressure. Mount the controller directly in the cylinder port rather than at the valve, so the throttled air volume stays small and the speed setting tracks the setting dial closely.
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 PSS1204AD-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. It connects 1/2in PT thread to Dia 12 one-touch tubing for soft nylon or polyurethane, is marked A for meter-out control, swivels 360 degrees on the tube side, and carries a black body. The -S version uses a SUS304 stainless throttling column instead of brass.
No. Every pressure, vacuum, proof-pressure and temperature figure matches the standard grey part, and the dimension envelope, the A meter-out control method and the knob-and-locking-cap adjustment are identical - the tubing stays Dia 12 on a 1/2in PT port either way. What changes is the wetted metal: the brass throttling column becomes SUS304 stainless, the spring gasket becomes stainless, and the throttling body is aluminium alloy or SUS304. That removes copper from the air path for plating tanks, wash-down zones and other corrosive or copper-sensitive locations. No separate certification or surface-finish spec is published for the stainless line.
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