Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802BD
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802BD 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 PSS802BD
The PSS802BD is a universal (360-degree swivelling) speed controller that meters the air flowing OUT of your cylinder or actuator and back toward the 1/4in thread port, while the opposite direction passes freely. The B suffix marks it as meter-in: flow from the thread port into the tube runs unrestricted, and the throttled stroke is the return. AirTAC's own application guidance is that meter-out is the first priority for double-acting cylinders, so choose this B code deliberately - it is the correct match for single-acting spring-return actuators, where the spring does the return work and you only need to slow the power stroke.
The fitting body is brass with a PBT holder and NBR seal, and the housing is finished in black: the D suffix in the order code. Standard PSS parts ship grey, so the black body lets you colour-flag a specific function on the machine - for example every return-speed control in one zone. Unlike a PSL, the tube fitting swivels a full 360 degrees after installation, so the 8mm polyurethane or nylon hose can approach from any angle without fighting the fitting and kinking the line. Speed is set with the aluminium adjusting cap, which locks to hold the setting against vibration.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802BD Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802BD |
|---|---|
| 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 PSS802BD
| 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 PSS802BD Is Used
Single-acting carton kicker
A spring-return pusher that flicks rejected cartons off a packaging conveyor needs its extend stroke timed to the belt pitch. Meter-in control on the supply side is exactly the right arrangement for a single-acting cylinder, and the 1/4in thread drops straight into the valve manifold outlet.
Single-acting dosing cylinder
On a chemical metering bench where copper-catalysed reactions are a concern, pair the brass-bodied PSS802BD with the copper-free PHV finger valve downstream for isolation, and use the meter-in throttle to slow the dispense stroke of a spring-return dosing cylinder.
Trailer tailgate assist ram
A single-acting ram that eases a heavy tailgate down must never drop at free-fall speed. The meter-in B control restricts the power stroke while the spring return stays unrestricted, and the 360-degree swivel body tolerates the hose movement as the gate swings.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802BD the Right Part?
Size both ways before ordering: one step down on the same 1/4in thread is the PSS602B with a Dia 6 tube, and one step up is the PSS1002B with a Dia 10 tube. The thread stays the same across that ladder - what changes is the hose bore, and therefore how much air the line carries and how coarse the speed adjustment feels. Match the tube size to the cylinder port fitting you already run rather than upsizing on instinct.
Pick the PSS over the fixed-direction PSL whenever the hose approach angle is awkward or the controller sits somewhere the tube must rotate during maintenance. If your actuator is double-acting and driven by a solenoid valve, order the A meter-in/meter-out counterpart instead - throttling the exhaust on a double-acting cylinder builds a back-pressure cushion and prevents stick-slip, which meter-in does not. Whichever you choose, install the controller directly at the actuator port so the small controlled volume gives you finer, more repeatable speed settings.
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 PSS802BD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, vacuum capability down to -750 mmHg (10 Torr), and an operating temperature range of -20 to +70 C. This specific code is the Dia 8 tube size with a 1/4in PT thread, universal swivelling body, meter-in (B) control method, finished in black per the D suffix. Thread standard is PT throughout this series.
Meter-out is AirTAC's stated first priority for double-acting cylinders because throttling the exhaust leaves a back-pressure cushion and the stroke runs smoothly. Meter-in is the correct pick for single-acting spring-return cylinders: the spring controls the return anyway, so you only need to slow the air-powered stroke. Running meter-in on a double-acting cylinder under a changing load tends to cause stick-slip, so reserve this PSS802BD for single-acting duties or circuits you have specifically balanced for it.
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