Airtac PSL Throttle Speed Control Fitting PSL801A-S
SUS304 stainless variant (-S)The AirTAC Airtac PSL Throttle Speed Control Fitting PSL801A-S is a genuine speed controller, threaded elbow with knob with aluminium-alloy locking cap and fixed tube direction, used to set the speed of a pneumatic cylinder by throttling its air.
- TypeSpeed controller, threaded elbow
- SeriesPSL
- 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 PSL Throttle Speed Control Fitting PSL801A-S
PSL801A-S is an AirTAC in-line speed controller in the stainless variant: the brass throttling column of the standard PSL is replaced with SUS304 and the spring gasket is stainless as well, so the part stands up to wash-down spray, salt-laden air and corrosive mist. This code is a meter-out controller (suffix A, handle marked A): air flowing from the 1/8in PT thread port out to the Dia 8 tube is throttled, while flow in the reverse direction passes freely. AirTAC lists meter-out as the first priority because a solenoid valve driving a double-acting cylinder benefits from exhaust throttling - the trapped back pressure cushions the stroke and stops it slamming or sticking-slip under a changing load.
Adjustment is by knob under an aluminium locking cap: set the speed, then screw the cap down so vibration cannot drift the setting. The threaded body has a fixed tube direction - it screws into the component port and the Dia 8 push-in outlet points one way only, so plan the orientation before tightening. It runs soft nylon or polyurethane tubing at 0-1.0 MPa working pressure, 1.5 MPa proof, from -20 to +70 C, with vacuum capability to -750 mmHg.
Airtac PSL Throttle Speed Control Fitting PSL801A-S Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL801A-S |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed 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 PSL Throttle Speed Control Fitting PSL801A-S
| PSL | Speed controller, threaded elbow. |
|---|---|
| 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 PSL Throttle Speed Control Fitting PSL801A-S Is Used
Bottling-line rinse head
Slows the rinse-head descent on a caustic bottle-wash station where a standard brass column would pit; the SUS304 column with meter-out throttling keeps the head from slamming into the bottle table.
Electroplating jig lift
Meters the rise of a plating jig so acid drag-out does not slop over the tank lip; the stainless throttling column removes the brass surface that mist would otherwise attack near the bath.
Marine hatch damper
Controls a deck-hatch closing cylinder on a workboat where salt air corrodes brass fittings; meter-out lets the hatch settle gently onto its rubber seal instead of dropping on the last centimetres.
Is the Airtac PSL Throttle Speed Control Fitting PSL801A-S the Right Part?
Step down to PSL601A-S if you need Dia 6 tubing on the same 1/8in thread; Dia 8 is already the largest tube AirTAC offers on this thread size, so there is no step up within 1/8in. If you keep Dia 8 but want a beefier port, the move is PSL802A-S on a 1/4in thread, which gives a stiffer connection on larger manifolds and valve bodies. Fit the controller directly at the cylinder port so the throttled air volume stays small and each knob adjustment gives a crisp response. AirTAC publishes tuning behaviour only as characteristic curves, never as a turns-from-closed figure, so dial the speed in on the machine itself.
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 PSL Throttle Speed Control Fitting PSL801A-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. This SKU is Dia 8 tubing, 1/8in PT thread, meter-out control (A), with a SUS304 stainless throttling column in place of brass and a stainless spring gasket.
No. A speed controller is a throttle, not an isolation valve - even fully closed it leaks slightly by design, and AirTAC does not present PSL-type parts as shut-offs. For circuit isolation use the PHV finger valve, a manual quarter-turn shut-off; PHV has no separate -S code because it is already copper-free as standard.
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