Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD 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
The PSS4M5AD is a universal speed controller: it throttles air in one direction and lets it pass freely in the other, so you set how fast an actuator strokes without starving the return stroke. The A suffix means meter-out - flow from the M5 thread port to the Dia 4 tube is restricted, while the reverse path runs wide open. AirTAC treats meter-out as the default choice: on a double-acting cylinder driven by a solenoid valve, throttling the exhaust builds a back-pressure cushion that keeps the piston smooth instead of lurching under changing load. The handle is marked A so the fitter can confirm the orientation on the machine.
The PSS body is the universal version of the PSL: the tube union swivels a full 360 degrees, which matters at Dia 4 because soft polyurethane tubing kinks and untwists badly if you fight its natural lay with a fixed fitting. Adjustment is by aluminium locking cap and knob over a brass throttling column; tighten the cap after setting and the trim survives vibration. The trailing D means the body is black rather than the standard grey.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD |
|---|---|
| Type | Universal speed controller |
| Series | PSS |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | 360 degree adjustable tube direction |
| 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. 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
| 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. |
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 Is Used
Micro gripper on a lens handling head
A small two-finger gripper closing on an optical lens holder needs a gentle, repeatable clamp. The Dia 4 bore and M5 port suit compact gripper bodies, and the swivelling union follows the gripper rotation without twisting the tubing.
Laboratory dosing slide
On a benchtop analytical instrument, a spring-return dosing slide must travel slowly and consistently stroke after stroke. Meter-in control on the B variant matches single-acting drives; this A version suits a double-acting slide where exhaust throttling stops stick-slip.
Test-rig fixture clamps
Electronics test fixtures often pack many small actuators into a tight base plate. The 360 degree swivel lets each Dia 4 tube route cleanly to the manifold, and the black D finish blends into instrumentation panels where grey fittings stand out.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5AD the Right Part?
Meter-out (this A model) is the right call for a double-acting cylinder on a solenoid valve. If your actuator is single-acting - spring-return or gravity-return - choose the meter-in B version instead, because there is no opposite-side volume to cushion. For sizing, Dia 4 is the only tube PSS offers on M5, so there is no step down; the next size up in the ladder is Dia 6, but that moves you to a 1/8 inch thread (PSS601A). If you would rather set speeds quickly by hand and re-trim often, the knob here beats a push-lock cap; if you need a setting that cannot be knocked out, that is when PTL push-lock types win. Fit the controller directly at the cylinder port so the small throttled volume gives fine, stable control.
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 FAQ
Working pressure 0 to 1.0 MPa (0 to 10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is a universal (360 degree swivel) speed controller for Dia 4 mm tube on an M5 thread, meter-out control (A), black body. It runs on soft nylon or polyurethane tubing.
The handle is stamped A and the restriction acts on flow entering the M5 thread port and leaving through the Dia 4 tube; the opposite direction is free. Mount the PSS4M5AD at the cylinder port with the thread side toward the valve, so the exhaust from the cylinder is throttled and the controlled volume stays small for stable settings. Note this is a flow trim, not a shut-off - only the PHV finger valve isolates a circuit.
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