Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801AD-S
SUS304 stainless variant (-S)The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801AD-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 PSS801AD-S
The PSS801AD-S is a universal (swivel-body) speed controller that sets actuator speed by throttling air in one direction and passing it freely in the other. This code carries the A suffix, so it is a meter-out controller: flow from the 1/8 in PT thread port out to the Dia 8 tube is restricted, while return flow runs unthrottled. That is the configuration AirTAC recommends first, because on a double-acting cylinder the throttled exhaust builds a back-pressure cushion that keeps the stroke smooth instead of stick-slipping under a changing load. A knurled cap marks the A direction so the setting logic stays clear on the machine.
The -S variant replaces the brass throttling column with SUS304 stainless steel, which removes copper from the wetted flow path - a real requirement in electronics assembly, plating shops and certain food processes. The black D-suffix body and the 360-degree swivel tube outlet complete the package: thread the 1/8 in PT taper into the cylinder port, seal the taper thread with tape, then rotate the tube outlet to line up with the run without twisting the tubing.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801AD-S Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801AD-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 PSS801AD-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 PSS801AD-S Is Used
Wash-down diverters on a dairy fill line
A Dia 8 pusher that diverts cartons between conveyor lanes gets rinsed every shift. The SUS304 throttling column shrugs off caustic wash-down where a brass column would tarnish, and the swivel outlet copes with the odd routing around the guard rail.
Copper-free pick-and-place in electronics
An SMT board-transfer gripper must see no brass particles in its air path. The stainless column makes this controller suitable for the copper-free circuits demanded around cleanroom pick-and-place arms, while meter-out control stops the arm slamming at end of stroke.
Black-cabinet pacing cylinder on a case packer
Machine builders fitting speed controls inside a dark control cabinet or behind smoked guards specify the D black finish so the valve does not stand out. The 1/8 in PT port threads straight into the standard NPT/PT ports on a compact indexing cylinder.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801AD-S the Right Part?
Meter-out (this A code) is the default choice for a solenoid valve driving a double-acting cylinder - clamp, gripper or slide. Choose meter-in instead only for a single-acting cylinder; meter-in control on a double-acting actuator tends to hunt under varying load. Prefer this PSS universal body over a fixed PSL whenever the tubing cannot arrive square to the port - the swivel saves a fitting and one stress point on the tube.
On the PSS ladder at a 1/8 in thread there are only two bores: Dia 6 and this Dia 8. Step down to PSS601A-S for lighter lines and smaller actuators; for a bigger bore at Dia 8 you must step the thread up to 1/4 in, which is PSS802A-S. Bigger bore means more free-flow capacity for the same pressure drop. Mount the controller directly at the cylinder port so the throttled air volume stays small and the response to a knob change is immediate.
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 PSS801AD-S FAQ
It is a universal speed controller for Dia 8 soft nylon or polyurethane tubing on a 1/8 in PT thread, meter-out (A) control, black body, SUS304 stainless throttling column. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure is -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the working temperature range is -20 to +70 C. These ratings are identical to the standard brass-column PSS801AD; only the column material changes.
No. D only means the body is black instead of grey, and -S only swaps the brass throttling column for SUS304 - the dimensions, adjustment and A/B control logic are unchanged. Installation is the same as any PSS: seal the 1/8 in PT taper thread with sealant tape, thread it into the cylinder port, then swivel the tube outlet up to 360 degrees to meet the tubing run. The push-fit takes Dia 8 soft nylon or polyurethane tube; note that PSS at 1/8 in is made only in Dia 6 and Dia 8 bores, so this is the largest tube you can run on this thread in the PSS series.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Speed Controllers
Request a Quote for Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801AD-S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.