Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5B
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5B 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 PSS4M5B
The PSS4M5B is a universal (360-degree swivel) speed controller that sets actuator speed by throttling air in one direction while the opposite flow passes unthrottled. This code carries the B suffix, so it is a meter-in type marked B: air flowing from the M5 thread port out through the Dia 4 tube runs free, and the return flow is the controlled one. AirTAC's own selection guidance pairs meter-in control with single-acting cylinders, where a spring or load returns the piston and strict exhaust back-pressure is not needed.
The Dia 4 tube is the smallest bore AirTAC offers on the PSS ladder, and M5 is the only thread made for it, so this SKU sits at the very bottom of the range. It is aimed at miniature circuits: micro cylinders, compact slides and grippers whose ports are threaded M5 directly on the actuator body. Adjustment is a knob with an aluminium locking cap that resists vibration creep; the tube union swivels a full 360 degrees, so a rigid nylon or polyurethane line can enter at whatever angle the cramped manifold allows without twisting the seal. Standard finish is grey, with a D-order suffix for black.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5B Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5B |
|---|---|
| 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 PSS4M5B
| 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 PSS4M5B Is Used
SMT pick-head release cylinder
On a surface-mount placement head, the Dia 4 circuit and M5 ports live millimetres from the nozzle. Meter-in control feeds the tiny single-acting lift cylinder gently, so a 0402 component is set down instead of flicked off the pad.
Analytical instrument sample slide
A compact spring-return slide that shuttles sample vials under a probe needs a slow, repeatable extend. This meter-in controller meters the supply to the Dia 4 cylinder while the spring handles return, keeping the vial from sloshing.
Label-head hold-down on a labelling machine
The small clamp that presses a label onto a moving web must close softly or it creases the film. An M5-threaded mini cylinder with a Dia 4 line and this swivelling controller lets the fitter angle the tubing around the print head and still tune the closing speed.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS4M5B the Right Part?
Dia 4 on M5 is the floor of the PSS table, so there is no smaller step - say so to the buyer rather than inventing one. The step UP is a double step: PSS6, Dia 6 tube, moves to the 1/8 in thread and gains a larger controlled orifice, which changes how finely you can feather a slightly bigger piston. If the actuator port is already M5 and the tubing is 4 mm, this is the only correct SKU; if the tubing is 6 mm, jump to the Dia 6 ladder instead of forcing a smaller tube onto a bigger barb.
Choose the swivelling PSS over the fixed PSL when the fitting must rotate to line up with a cramped manifold face; choose the inline PSA when there is no thread port at all. Whichever body you pick, mount the controller at the cylinder port, not at the valve, so the volume of air being throttled stays small and response stays crisp.
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 PSS4M5B FAQ
It is a meter-in (B) universal speed controller with a Dia 4 mm tube on an M5 PT thread. Working pressure is 0 to 1.0 MPa (0 to 10 kgf/cm2), it tolerates negative pressure down to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the temperature range is -20 to +70 C. Use soft nylon or polyurethane tubing only.
No. A speed controller is not a shut-off valve: even fully closed it is designed to leak slightly, so it must never be relied on to isolate a circuit for maintenance. If the line needs a positive lock-out, add a separate shut-off - AirTAC's PHV finger valve family is made for that duty.
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