Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601A
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601A 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 PSS601A
The PSS601A is a universal flow speed controller that meters air in one direction and lets it pass freely in the other, so you can set how fast an actuator strokes. This code ends in A, which makes it a meter-out controller: flow from the 1/8in PT thread port into the Dia 6 tube is throttled, while the return path runs wide open. AirTAC calls meter-out the first priority choice because throttling the exhaust of a double-acting cylinder builds a back-pressure cushion that keeps the stroke smooth instead of stick-slipping under a changing load. The handle is marked A so the fitted direction is obvious on the machine.
Universal means the threaded body screws into the port while the Dia 6 tube side swivels a full 360 degrees, so the tubing can enter at whatever angle the machine layout demands without twisting the hose. A knob on top sets the flow and an aluminium locking cap clamps it against vibration drift. Inside, a brass throttling column runs in a brass body with a PBT holder, NBR seal and POM interface, rated 0 to 1.0 MPa, -750 mmHg vacuum and -20 to +70 C.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601A Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601A |
|---|---|
| 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 PSS601A
| 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 PSS601A Is Used
SMT pick-and-place Z axis
Throttles the downward stroke of a placement head so a vacuum-carrying arm settles components onto PCB pads instead of slamming, with the free return direction keeping the lift stroke quick between placements.
Carton sealing jaw on a packaging line
Sets the closing speed of a pneumatically driven sealing jaw so it presses the flap gently before the heater cycle, while the unthrottled opening stroke keeps the machine index rate up.
Label applicator pad stroke
Times the extend stroke of an applicator pad to the conveyor pitch so labels press on without skewing, and the swivelling Dia 6 tube connection clears the tight space beside the applicator head.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601A the Right Part?
Size ladder for PSS at 1/8in thread: Dia 6 sits below Dia 8, which is the only larger bore on this thread. If you keep the Dia 6 tube but change thread, the same bore appears on 1/4in where Dia 8 and Dia 10 join the range, while the M5 version of this family carries only Dia 4. A larger bore passes more free-flow air for the same actuator volume; pick the size to match the tubing you already run. Choose the PSS over the fixed-direction PSL when the hose must approach at an angle, over the PSA when you need a threaded port rather than an inline tube-to-tube splice, and over a PTL if you prefer a hand knob to a push-lock cap - the knob is quicker to set during commissioning, while the push-lock resists being knocked out of adjustment. Fit the controller directly at the cylinder port so the throttled air volume stays small and response 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 PSS601A FAQ
Working pressure 0 to 1.0 MPa (0 to 10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is the Dia 6 tube size with a 1/8in PT thread, meter-out control (A suffix), grey body, brass throttling column and body, PBT holder, NBR seal and POM interface. Soft nylon or polyurethane tubing both seal correctly in the Dia 6 socket.
No. A speed controller is a throttle, not an isolation valve - even fully closed, the needle design allows a slight leakage path, so air will creep past over time. For positive shut-off use a dedicated valve such as the AirTAC PHV finger valve. Another detail worth knowing: the A suffix means the throttle acts from thread port to tube, so if the cylinder strokes the wrong way after fitting, turn the controller around rather than swapping the whole fitting.
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