Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601B
The AirTAC Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601B 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 PSS601B
The PSS601B is a universal speed controller that sets how fast a pneumatic actuator moves by throttling the air in one direction while letting it pass freely the other way. This is the B code, meter-in: air flowing from the 1/8in PT thread port out to the Dia 6 tube runs at full bore, and the return flow is restricted. That makes it the right choice on a single-acting cylinder, where the spring or load does the return and you only need to limit the power stroke. The handle is marked B so fitters can confirm the control direction at a glance.
Unlike the fixed-body PSL, the tube joint on a PSS swivels a full 360 degrees, so you can drop the controller into the port first and then swing the Dia 6 tubing to whatever route the machine needs, without twisting the hose or fighting the fitting. Speed is set with a knurled knob and held by an aluminium locking cap: push the cap down to freeze the setting against vibration, lift it to adjust. Inside are a brass throttling column and body in a PBT plastic shell with an NBR seal.
Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601B Technical Specifications
| Model | Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601B |
|---|---|
| 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 PSS601B
| 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 PSS601B Is Used
Spring-return kicker on an assembly press
A single-acting kicker cylinder that nudges a part into a locating nest can fire too hard and bounce the part back out. Meter-in control on the power stroke gives the operator a slow, controllable nudge while the spring returns it freely.
Glue-head actuator on a carton-sealing line
The small single-acting cylinder lowering a glue nozzle onto carton flaps needs a consistent approach speed or the bead lands unevenly. The PSS601B swivel joint lets the 6mm hose route cleanly around the moving head.
Sample lift on a laboratory test rig
Lifting and lowering specimen trays in a materials test bench must be gentle so fixtures do not shift. A meter-in controller on the upstroke keeps the lift smooth, and the locking cap holds the setting between test runs.
Is the Airtac PSS Exhaust Throttle Type Universal Speed Control Valve PSS601B the Right Part?
Match the control method to the actuator before you match the size. Meter-in (this B version) suits single-acting cylinders and short, lightly loaded strokes; on a double-acting cylinder under varying load, meter-in tends to stick-slip, and a meter-out A code is the better default. This 1/8in thread size carries Dia 6 and Dia 8 tube: step up to the PSS801B when the hose run is long or the actuator is hungrier for air, and drop to the PSS4M5B on the M5 thread when you are feeding a tiny guide or sensor cylinder. Swivelling to a bigger bore does not change the ratings, only the flow capacity of the circuit.
Fit the controller directly at the cylinder port rather than at the valve. Throttling at the port keeps the small trapped volume between controller and cylinder, which gives finer, more repeatable speed control. Note that a speed controller never fully seals when closed - it is not a shut-off valve; use a proper isolation valve if the circuit must be locked off.
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 PSS601B FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and an operating temperature of -20 to +70 C. It takes Dia 6 soft nylon or polyurethane tubing on a 1/8in PT thread port and is the B, meter-in version with a 360 degree swivelling tube joint. Standard colour is grey; add a D suffix for black.
Screw it straight into the cylinder port so the throttled volume stays small - controlling from the valve end makes the stroke sluggish and hard to repeat. Push 6mm soft nylon or polyurethane tubing fully home and let the swivel joint take up any hose misalignment instead of bending the tube. To set speed, lift the aluminium locking cap, turn the knob to the desired stroke time, then press the cap down to lock it. Remember this B code throttles the return flow, so confirm your cylinder is single-acting before installation.
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