Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A 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 PSS802A
The PSS802A is a universal speed controller that throttles air in one direction and lets it pass freely in the other, so you can set how fast a cylinder or rotary actuator moves. The A suffix means meter-out: flow from the 1/4in thread port out to the Dia 8 tube is restricted, while return flow through the same body runs free. AirTAC treats meter-out as the first 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 shifting load.
The universal body swivels a full 360 degrees on its thread, so the tube can leave at whatever angle your manifold or port actually needs without re-plumbing the panel - the key difference from the fixed-direction PSL in the same size. Adjustment is a throttling knob with an aluminium locking cap; spin it to set the speed, then tighten the cap so vibration on the machine cannot drift the setting. Thread side is 1/4in PT, tube side takes 8mm OD soft nylon or polyurethane push-in.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A |
|---|---|
| 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 PSS802A
| 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 PSS802A Is Used
Pick-and-place arm descent control
On a gantry pick-and-place arm lowering PCB assemblies into a test nest, meter-out throttling on the exhaust keeps the Z-axis cylinder from slamming the board home. The 360-degree swivel lets the Dia 8 tube route clear of the guide rails.
Carton indexing pusher timing
A pusher cylinder that nudges cartons across a conveyor chain must complete its stroke inside one pitch window. The PSS802A at the cylinder port lets the line setter dial the stroke time to match the conveyor speed, then lock the knob cap.
Furniture edge-banding clamp
In an edge-banding press, the clamp cylinder has to close gently onto a finished laminate face so the surface is not marked. Meter-out control on the closing stroke gives a soft approach and firm hold on the same 1/4in circuit.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802A the Right Part?
Meter-out (this A version) is the default for a solenoid valve driving a double-acting cylinder: exhaust back-pressure damps the load. Choose meter-in (B suffix) mainly for single-acting cylinders; meter-in on a double-acting cylinder tends to stick-slip as the load changes. Pick the PSS body over the fixed PSL when the fitting sits somewhere the tube cannot point straight out - the swivel removes the strain and the 90-degree kink.
Sizing both ways on the 1/4in thread ladder: one step down is the PSS602A on 6mm tube, better where a smaller bore feeds a light gripper and you want finer low-speed trim; one step up is the PSS1002A on 10mm tube for heavier clamping cylinders that move more air. At Dia 8 you are on the middle rung. Fit the controller directly at the cylinder port so only the short stub of tubing between valve and actuator sees the throttled volume - 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 PSS802A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2); proof pressure 1.5 MPa; usable vacuum to -750 mmHg (10 Torr); operating temperature -20 to +70 C. This SKU is the Dia 8 tube size with a 1/4in PT thread port, meter-out (A) control, and a body that swivels 360 degrees. It suits soft nylon or polyurethane tubing only, and the standard colour is grey (add a D suffix for black).
The PSS tube union rotates a full 360 degrees on the thread, so after you tighten the 1/4in PT port into a crowded manifold or cylinder head you can still point the Dia 8 tube wherever the hose run needs it. A fixed PSL must be clocked at installation, which often means a kinked tube or an extra elbow. The throttling function and A/B control method are identical between the two - only the tube orientation freedom differs.
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