Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5A-S
SUS304 stainless variant (-S)The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5A-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 PSS4M5A-S
The PSS4M5A-S is a stainless universal speed controller that sets the speed of a small actuator by throttling air in one direction and letting it pass freely in the other. The A suffix marks meter-out: flow from the M5 thread port out through the Dia 4 tube is restricted, while return flow runs at full bore. AirTAC treats meter-out as the first choice because throttling the exhaust of a double-acting cylinder builds a back-pressure cushion, so the stroke stays smooth instead of sticking and slipping under a changing load. The handle carries an A mark so the setting direction is obvious on the machine.
Universal means the brass-replaced body swivels 360 degrees on its M5 thread, so the 4 mm tube can leave at whatever angle the hose run needs without fighting the fitting. Adjustment is a knob with an aluminium locking cap: set the speed by hand, then screw the cap down so vibration cannot drift the setting. In this stainless version the throttling column is SUS304 instead of brass, which suits copper-free zones such as plating lines and electronics processes. Ratings are unchanged from the standard part: grey or D-black colour codes do not apply here, and the thread standard is PT.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5A-S Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5A-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 PSS4M5A-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 PSS4M5A-S Is Used
Autosampler probe lift
A laboratory autosampler raising a sampling needle on a small single-acting cylinder. The Dia 4 bore and M5 port match compact instrument manifolds, and meter-out control keeps the probe from jabbing into vials.
Plating line lift pin
A lift pin on an electroplating jig where brass contact would contaminate the bath chemistry. The SUS304 throttling column keeps the part copper-free while the swivel body routes the 4 mm tube around the jig frame.
Bench jig dwell tuning
A small test-rig clamp that operators re-time between batches. The knob sets stroke speed in seconds and the aluminium locking cap holds the setting, so the cycle stays repeatable without tools.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5A-S the Right Part?
On the PSS ladder the M5 thread is offered in exactly one tube size, Dia 4, so this is the smallest and only M5 entry in the family. If your circuit needs a bigger bore you step to Dia 6, and that requires moving up to a 1/8 in thread (PSS6 series) rather than staying on M5. Fit the controller directly at the cylinder port so only the short cylinder volume sits downstream of the needle; throttling a long hose run makes the stroke sluggish and hard to tune.
Choose this over the fixed-direction PSL4M5A-S when the tube has to approach from an awkward angle, because the swivel removes the need for an extra elbow. Knob adjustment is faster to re-set than the push-lock caps used on the PTL mini series, which suits bench-built jigs and lab rigs where you dial speed in during commissioning. Use soft nylon or polyurethane tubing cut square for a reliable seal on the 4 mm barb.
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 PSS4M5A-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is the Dia 4 tube size with an M5 PT thread, meter-out (A) control, and a SUS304 stainless throttling column in place of brass. Ratings are identical to the standard PSS4M5A; only the column material changes.
Yes to the tubing: AirTAC rates these controllers for soft nylon or polyurethane, both of which seal well on the 4 mm push-in barb. No to shut-off: like every speed controller in this family it is designed to leak slightly when the needle is fully closed, so it must not be used to isolate a circuit. For positive isolation in a copper-free zone, specify the PHV finger valve, which is a true quarter-turn shut-off.
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