Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601AD
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601AD 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 PSS601AD
The PSS601AD is a universal speed controller that sets how fast an actuator moves by restricting the air in one direction and letting it run free in the other. This code ends in A, so it is the meter-out type: flow from the 1/8in PT thread port out to the Dia 6 tube is throttled, the return direction passes unrestricted, and the handle is stamped A. AirTAC rates meter-out as the first choice, and for good reason - on a double-acting cylinder the throttled exhaust builds a back-pressure cushion that keeps the piston from lurching or coasting, so the stroke stays smooth even as the load changes.
The tube side swivels a full 360 degrees on the body, so you can rotate the Dia 6 tubing to whatever angle the run needs after the thread is tightened - useful in tight control panels where the port orientation is fixed but the tubing is not. Adjustment is a black knob under an aluminium locking cap: set the speed, then screw the cap down so vibration cannot drift the setting. Body and holder are PBT plastic with a brass throttling column; the D suffix makes the cap black instead of the standard grey. The part also tolerates vacuum down to -750 mmHg, so it works on venturi pick-up lines, not just pressure circuits.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601AD Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601AD |
|---|---|
| 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 PSS601AD
| 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 PSS601AD Is Used
Small pick-and-place gripper arm
A compact 2-finger pneumatic gripper on an electronics assembly head needs a gentle, repeatable close on delicate connectors. The Dia 6 bore and meter-out control give fine exhaust throttling right at the cylinder port, and the 360-degree swivel lets the short tubing turn to clear the moving head.
Bench-top leak and vacuum test rig
Test stations that pull a vacuum on a part before pressurising it benefit from this controller's -750 mmHg rating. The 1/8in PT thread drops straight onto a common manifold, and the black cap keeps the adjustment discreet on a customer-facing bench.
Packaging machine indexing pusher
A carton indexing pusher timed to a conveyor chain must complete its stroke in step with the pockets without slamming the leading box. Meter-out control on the exhaust side holds a steady back-pressure cushion, and the locking cap keeps the set speed locked through a full production shift.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601AD the Right Part?
Pick meter-out (A) when a solenoid valve drives a double-acting cylinder - clamps, pushers, grippers - because controlling the exhaust gives the smoothest stroke. Choose meter-in only for single-acting cylinders; meter-in on a double-acting piston invites stick-slip under varying load. Between knob types and push-lock types, this knob version is the faster one to re-set by hand during commissioning, while a push-lock PTL resists accidental knocks better in daily service. PSS is the swivel-tube member of the family; pick PSL if a rigid fixed tube direction is fine and PSA if you need an inline tube-to-tube reducer with no thread port. On the size ladder: at the 1/8in thread, Dia 6 is the entry bore - there is no smaller PSS at this thread, so step to the M5 version with Dia 4 tube for miniature actuators, or up to the PSS801AD with Dia 8 tube when the line feeds a larger bore. Mount the controller directly at the cylinder port so the small throttled air volume responds quickly and smoothly.
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 PSS601AD FAQ
This is a Dia 6 tube, 1/8in PT universal speed controller, meter-out (A) control, black cap. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it withstands vacuum to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the temperature range is -20 to +70 C. Use soft nylon or polyurethane tubing of 6mm outside diameter.
Fit it directly at the cylinder port. Air enters the 1/8in PT thread port; if the cylinder exhausts back through that same thread, the A marking means that return path is throttled while flow out to the Dia 6 tube runs free - this is meter-out and is the default choice for double-acting cylinders. Because the tube connector swivels 360 degrees, you can orient the tubing freely after tightening the thread. Note that a speed controller is not a shut-off valve: fully closed it still weeps slightly, so isolate the circuit with a proper valve for maintenance.
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