Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801A
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801A 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 PSS801A
The PSS801A throttles air flowing from its 1/8in PT thread port out through the Dia 8 tube while letting the return flow pass unrestricted, so it sets the extension or retraction speed of an actuator without slowing the stroke in the other direction. This is the A code, AirTAC's meter-out control, and it is the version the catalogue itself recommends first: on a solenoid valve driving a double-acting cylinder, throttling the exhaust builds a back-pressure cushion that keeps the piston moving smoothly instead of hunting. The handle is marked A so the direction is visible on the machine.
The body is the universal type: once the threaded male stud is tightened into the port, the tube end swivels through 360 degrees, so you can point the knob wherever an operator's fingers can reach even when the port faces an awkward direction. Speed is set with a knob under an aluminium locking cap that stops vibration walking the setting away. Internally the throttling column and body are brass, the holder is PBT plastic, and the seal is NBR. Dia 8 is the largest tube size AirTAC offers on the PSS 1/8in thread ladder.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801A Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801A |
|---|---|
| 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 PSS801A
| 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 PSS801A Is Used
PCB gantry pick-and-place arm
Meter-out cushioning stops a vacuum placement head slamming down onto a populated circuit board, and the 360 degree swivel lets the knob face outward on a crowded manifold.
Conveyor indexing pusher
A Dia 8 push cylinder timed to divert cartons at a transfer point keeps a repeatable stroke cycle when the exhaust is throttled at the cylinder port.
Fixture clamp on a machined face
Closing a hold-down clamp gently onto a freshly milled aluminium surface avoids marking the finish, with the A setting locked under the aluminium cap.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS801A the Right Part?
Meter-out (this A version) is the default choice for a double-acting cylinder fed by a solenoid valve, because exhaust throttling holds a cushion and avoids stick-slip. Meter-in (the B code) suits single-acting cylinders. If you want a setting that survives being knocked, the push-lock PTL range holds adjustment better; this knob type is faster to dial in by hand. If the tube must rotate to clear other plumbing, the PSS swivel is the reason to pick it over the fixed PSL; if you need tube-to-tube inline control with no thread port at all, that is the PSA family.
Sizing: one step down on this 1/8in thread is PSS601A with a Dia 6 tube, which suits lighter compact actuators; Dia 8 is the top of the 1/8in ladder, so the next step up in bore, PSS802A, moves you to a 1/4in PT thread on the same Dia 8 tube. Fit the controller directly at the cylinder port so only the small volume of air between valve and actuator is throttled.
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 PSS801A FAQ
Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure is 1.5 MPa and it tolerates vacuum down to -750 mmHg (10 Torr). The temperature range is -20 to +70 C. This SKU takes a Dia 8 soft nylon or polyurethane tube on a 1/8in PT thread. Flow capacity is published by AirTAC as a characteristic curve rather than a single figure, so match it to your actuator bore and stroke time from the curve.
After you screw the PSS801A into the port you can still rotate the tube end a full 360 degrees, so the knob can be oriented for access even where the port points sideways or into a frame member. A PSL is fixed once tightened. Note that neither type shuts the circuit off: a speed controller leaks slightly when fully closed by design, so use a separate valve where isolation is needed.
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