Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD-S
SUS304 stainless variant (-S)The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD-S 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-S
The PSS602BD-S is a universal speed controller that sets the speed of a pneumatic actuator by throttling air in one direction and letting it pass freely in the other. The B in this code makes it a meter-in type: flow from the 1/4in PT thread port into the Dia 6 tube runs free, while flow in the reverse direction is restricted. AirTAC recommends meter-out as the default for double-acting cylinders, so this meter-in version is the right pick for a single-acting cylinder, spring-return actuator or any circuit where you want to throttle the supply side rather than the exhaust.
Unlike the fixed PSL body, the PSS tube connection swivels a full 360 degrees, so you can rotate the fitting to line up the tube after the thread is tightened instead of twisting the hose into position. The -S suffix makes this the SUS304 stainless variant: the throttling column inside is stainless 304 in place of the standard brass, which matters on plating lines, chemical benches and other copper-free installations. The finish is black (the D suffix), adjustment is by knob with a locking cap so the setting survives vibration, and the ratings are unchanged from the standard line.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD-S Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD-S |
|---|---|
| Type | Universal speed controller |
| Series | PSS |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | 360 degree adjustable tube direction |
| Body material | Stainless steel 304 (-S variant) |
| 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. Stainless (-S): SUS304 throttling column and body parts in place of brass, for copper-free environments. Ratings are unchanged from the standard version. 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-S
| 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. |
| -S | Stainless-steel body. |
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-S Is Used
Electroplating jig lift
A single-acting lift cylinder lowering a plating jig into a tank benefits from the SUS304 throttling column, which avoids brass dissolving into copper-sensitive bath chemistry. Meter-in controls the descent rate from the supply side.
Wash-down conveyor gate
On a food-line gate or reject flap driven by a small spring-return cylinder, the stainless internals shrug off daily hose-down while the locking cap holds the gate timing despite repeated plant washdown vibration.
Chemical dosing pump actuator
A Diaphragm dosing pump or sample-handling actuator on a chemical bench needs its stroke slowed predictably. The 360 degree swivel lets the 6mm polyurethane tube route cleanly to a cramped instrument panel without torsion on the fitting.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS602BD-S the Right Part?
This is the smallest tube that PSS offers on a 1/4in PT thread - Dia 6. There is no Dia 4 PSS with 1/4in thread; if you need Dia 4 you have to drop to an M5 thread (PSS401 series), which is a different sealing situation entirely. Stepping up to PSS802B (Dia 8, 1/4in) buys a larger bore and a stiffer tube run if the line is carrying more volume to the actuator. Decide the control method before the size: B meter-in here for single-acting loads, A meter-out (PSS602AD-S) if you are cushioning a double-acting cylinder.
Mount the controller directly at the cylinder port rather than back at the valve manifold. Throttling only the small trapped volume between fitting and piston gives crisp control; a controller placed mid-run throttles the whole hose length and the stroke can hunt. Tighten the 1/4in PT taper thread into the port and only then swivel the union to meet the tube run.
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-S FAQ
This SKU is a Dia 6 tube universal speed controller with a 1/4in PT thread, meter-in (B) control, black finish, SUS304 stainless throttling column. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and operating temperature -20 to +70 C. It is for soft nylon or polyurethane tubing.
No. AirTAC keeps every pressure, vacuum, proof-pressure and temperature figure identical to the standard PSS602B, and the body dimensions match too. What changes is the material: the throttling column is SUS304 stainless steel instead of brass, and the spring gasket is stainless, giving corrosion resistance and copper-free construction. AirTAC publishes no separate finish, passivation or certification figures for the stainless line, so any such claim elsewhere would be unsupported.
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