Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802B
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802B 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 PSS802B
The PSS802B 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 an actuator moves without plumbing in a separate check valve. The B suffix makes this a meter-in part: air flowing from the 1/4in PT thread port into the Dia 8 tube runs free, while flow in the reverse direction is throttled by the handle marked B. AirTAC's own catalogue guidance is that meter-out is the first priority for double-acting cylinders, so this meter-in code is the right choice where the actuator is single-acting or where a spring, weight or load provides the return force.
The universal body is the defining feature: the threaded port screws into the component, and the tube socket swivels a full 360 degrees, so the 8mm polyurethane or soft nylon line can enter from whatever angle your routing needs without twisting the hose. Adjustment is a grey knob with an aluminium locking cap - finger-set the speed, then screw the cap down so vibration on the machine cannot drift the setting. Internally it uses a brass throttling column and body with a PBT holder and NBR O-ring sealing. Note that a speed controller is not a shut-off device; it weeps slightly when fully closed, which is by design.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802B Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802B |
|---|---|
| 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 PSS802B
| 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 PSS802B Is Used
Spring-return clamp on a packaging line
A single-acting clamp that closes onto cartons on a carton sealer benefits from meter-in control: the PSS802B throttles the 1/4in supply into the Dia 8 line so the clamp jaw presses gently instead of snapping shut, while the spring return exhausts freely.
Capping press ram
On a bottle-capping press driven by a single-acting air ram, meter-in control smooths the downward press stroke onto the cap, and the swivelling tube socket lets the 8mm hose approach the body at the angle the machine frame allows.
Slide-gate kicker
A single-acting kicker that diverts product off a conveyor at a gate needs a timed, non-slam extension. This meter-in controller damps the extending stroke of the Dia 8 line feed while the gate's weight or spring handles retraction.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS802B the Right Part?
Meter-in throttling controls the air entering the actuator, so pick this B code for single-acting cylinders, spring-return rams or anywhere the return stroke is powered by something other than regulated air. If you are metering a double-acting cylinder under varying load, step to the PSS802A meter-out version instead - meter-in on a double-acting cylinder tends to stick-slip as the load changes. On the same 1/4in thread ladder the neighbouring bores are Dia 6 below (PSS602) and Dia 10 above (PSS1002); a smaller bore damps smaller volumes and a larger bore carries the bigger actuator feeds. The same Dia 8 bore also exists on a 1/8in thread as the PSS801, if your port is the smaller one. Fit the controller directly at the cylinder or actuator port so only the short stub of tubing between controller and port is throttled - mounted at the valve end, the whole line length becomes part of the cushioned volume and response gets sluggish.
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 PSS802B FAQ
Working pressure is 0-1.0 MPa (0-10 kgf/cm2), with negative pressure capability down to -750 mmHg (10 Torr) and a proof pressure of 1.5 MPa. The operating temperature range is -20 to +70 C. This specific SKU is the Dia 8 tube size with a 1/4in (02) PT thread, B suffix meter-in control, in the standard grey finish. The swivelling universal body lets the 8mm tube rotate 360 degrees relative to the thread.
No. A speed controller of this type is designed to leak slightly when fully closed, so it should never be relied on to isolate a circuit. Use it only to set speed. If you need a genuine manual shut-off in the line, AirTAC's PHV finger valve is the part for that job - a quarter-turn shut-off available in the same tubing sizes, including Dia 8.
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