Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD-S
SUS304 stainless variant (-S)The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD-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 PSS4M5AD-S
The PSS4M5AD-S is a stainless universal speed controller with a Dia 4 push-in tube outlet and an M5 PT thread inlet, configured as meter-out (suffix A): air flowing from the M5 port out through the tube is throttled by the needle, while the return direction runs free. Meter-out is AirTAC's first-priority setting because throttling the exhaust of a double-acting cylinder leaves a back-pressure cushion, so the load rides on air instead of stick-slipping mid-stroke. A knurled knob with a locking cap sets the speed; tighten the cap by hand and the setting holds against machine vibration.
The universal body is what separates PSS from the fixed-outlet PSL: the tube outlet swivels a full 360 degrees, so the knob can be clocked to a serviceable angle after installation without kinking the small Dia 4 tubing. The -S suffix fits a SUS304 throttling column in place of the standard brass one, with the throttling body in aluminium alloy or SUS304 and a stainless spring gasket - a practical upgrade where condensate, wash-down or corrosive vapours attack brass. The D suffix marks the black version. Ratings are identical to the standard line: 0-1.0 MPa, vacuum to -750 mmHg, -20 to +70 C.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD-S Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD-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 PSS4M5AD-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 PSS4M5AD-S Is Used
SMT pick-and-place head
A compact placement head lowered by a small bore cylinder on Dia 4 polyurethane tubing: meter-out throttling softens the descent onto the PCB so components are not slammed into pads, and the M5 thread screws straight into the valve manifold.
Analytical sampler carousel
Lab and diagnostic instruments index a sample carousel with a miniature actuator; the SUS304 throttling column avoids brass in reagent-adjacent cabinets, and the locking cap keeps a validated stroke time fixed between service visits.
Bench-top fixture clamp
A small test-bench clamp on Dia 4 line closes onto finished housings; meter-out control lets the operator tune the closing speed by feel and the 360 degree swivel outlet lets the black body sit at a readable angle on the fixture plate.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD-S the Right Part?
On the PSS ladder, M5 exists in one bore only: Dia 4. There is no smaller or larger M5 step, so if you need more capacity you change thread, not bore - the next rung up is PSS6-01A, which pairs a 1/8 in PT port with Dia 6 tubing. Stepping up buys a larger free-flow path for longer or higher-demand circuits, at the cost of a bigger port on your manifold or valve. If the M5 port and Dia 4 tube already match your valve outlet and existing tubing, stay on this SKU.
Choose PSS over PSL when the tube must enter at an angle or the knob needs to face outward on a crowded panel; choose the PTL push-lock version instead if settings get disturbed by operators, since a push-lock cap cannot be twisted casually. Fit the controller directly at the cylinder port so the small volume of throttled air does the timing and the response to knob adjustments 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 PSS4M5AD-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure down to -750 mmHg (10 Torr), and an operating temperature range of -20 to +70 C. This SKU is the Dia 4 tube by M5 PT thread, meter-out (A) version in the SUS304 stainless build, finished in black (D).
AirTAC rates this controller for soft nylon or polyurethane tube in Dia 4 only. Cut the tube square, push it fully home into the swivel outlet and tug it to confirm the collet has gripped. Rigid nylon, braided hose or metal tube will not seal reliably at this bore. Because the outlet swivels 360 degrees, route the tube first, then rotate the body so the knob faces you - never torque the tube to aim the knob.
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