Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD 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 PSS602BD
The PSS602BD is a universal speed controller: it throttles air in one direction and lets it pass freely in the other, so you set how fast an actuator strokes without losing power. This code carries the B suffix, which is AirTAC's meter-in control. Air from the 1/4in thread port into the Dia 6 tube runs unrestricted, while flow in the reverse direction is throttled. Meter-in is the right choice for a single-acting cylinder, where the spring returns the piston and you only need to govern the power stroke.
The tube side of the body swivels a full 360 degrees, so you can align the tubing after tightening the thread and the fitting never fights the hose. Adjustment is by a knurled knob backed by an aluminium locking cap: set the speed by hand, then screw the cap down so vibration on the machine frame cannot drift the setting. The D suffix orders this part in black rather than the standard grey, and the internals stay the same - brass throttling column and body, PBT holder, NBR seal.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD |
|---|---|
| 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 PSS602BD
| 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 PSS602BD Is Used
Spring-return clamp on a benchtop press
A single-acting clamp closing onto an anodised aluminium housing needs a governed power stroke; the meter-in control paces the advance while the spring returns it freely.
Carton sealer lid press
On packaging lines the single-acting lid press must descend without bouncing the carton off the belt. The locking knob holds the speed setting against constant frame vibration.
Single-acting marker stamp on a coding head
A short-strike stamping marker over an ink roller needs crisp entry and instant spring return; the unrestricted thread-to-tube feed keeps the strike sharp while return damping is set at the port.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD the Right Part?
Meter-in (B) suits single-acting cylinders and simple push functions; if you are speed-controlling a double-acting cylinder driven by a solenoid valve, step to the A meter-out version instead, because throttling the exhaust leaves a back-pressure cushion and the stroke stays smooth under varying load. On the 1/4in thread, PSS is offered in Dia 6, 8 and 10 - this Dia 6 is the entry size, so there is no larger thread needed to go smaller; drop to the PSS601B on a 1/8in port if your valve is smaller, or step up to the PSS802B for heavier tubing. Whichever size you pick, mount the controller directly in the cylinder port: the throttled air volume stays small and response stays crisp. Choose PSS over the fixed-tube PSL when the machine layout makes tube routing awkward - the swivel removes side load on the hose, and over the push-lock PTL types when you want a hand knob you can re-set on the line without tools.
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 PSS602BD FAQ
It is a universal speed controller for Dia 6 mm soft nylon or polyurethane tubing on a 1/4in PT thread, meter-in (B) control, black finish. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, and it tolerates vacuum down to -750 mmHg (10 Torr). Operating temperature is -20 to +70 C. Applicable tubing is soft nylon or polyurethane.
It will work but it is the wrong choice. Meter-in control on a double-acting cylinder leaves the exhaust side unpressurised, so the piston tends to stick-slip as the load changes. For double-acting cylinders driven by a solenoid valve, use the A meter-out version, which throttles the exhaust and keeps a back-pressure cushion for a smooth stroke. Also note that a speed controller leaks slightly when fully closed - it is not a shut-off. For isolating a circuit use the AirTAC PHV finger valve instead.
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