Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS is a genuine push-lock speed controller, threaded elbow with push-lock adjusting cap (pom) and fixed tube direction, used to set the speed of a pneumatic cylinder by throttling its air.
- TypePush-lock speed controller, threaded elbow
- SeriesPTL
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- AdjustmentPush-lock adjusting cap (POM)
- 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 PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS
The PTL401B-MS is the SUS304 stainless build of AirTAC's PTL-M mini push-lock speed controller, made for Dia 4 soft nylon or polyurethane tube on a 1/8 in PT thread. Like every speed controller in the family it throttles air in one direction and lets it pass freely in the other. The B code marks meter-in: flow from the tube back to the thread port is controlled, while the supply direction runs free. AirTAC's own guidance is that meter-out is the default for double-acting cylinders, and a meter-in part like this is the correct match for a single-acting cylinder, where the return spring rather than back-pressure handles the retract.
Instead of a knob, a push-lock cap holds the adjustment - press to release, slide to the wanted speed, and the cap resists being knocked out of position by vibration or a passing hand. The throttling column is SUS304 in place of brass, the body is aluminium alloy or SUS304, and the spring gasket is stainless, so the valve suits copper-free lines in electronics, plating and similar processes. AirTAC publishes exactly one torque figure for this family, and it belongs to this cap: 0.08 N.m at the 1/8 in size.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS |
|---|---|
| Type | Push-lock speed controller, threaded elbow |
| Series | PTL |
| Adjustment | Push-lock adjusting cap (POM) |
| Orientation | Fixed tube direction |
| Body material | Stainless steel 304 (-S variant) |
| Size class | Mini series (-M) |
| 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 PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS
| PTL | Push-lock speed controller, threaded elbow. |
|---|---|
| 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. |
| -M | Mini series. |
| -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 PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS Is Used
Laboratory dispense slide
A small single-acting dispensing cylinder on a liquid-handling station needs a slow, even downstroke. Meter-in control from this B-coded valve throttles the retract path while the spring return does its work, and the Dia 4 bore matches the compact tubing runs on benchtop instruments.
Checkweigher reject pusher
On a food-line checkweigher a spring-return pusher kicks underweight packs off the belt. The SUS304 column and stainless spring gasket stand up to washdown, and the push-lock cap keeps the reject speed locked where an operator cannot knock it off setting.
PCB test fixture clamp
A single-acting clamp pressing a board onto pogo-pin contacts must close without slamming the fixture. The copper-free SUS304 build suits electronics assembly air, and the 1/8 in PT thread lands on standard valve and manifold ports.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS the Right Part?
This mini sits at the very small end of the PTL ladder. Inside the -MS mini series only Dia 4 and Dia 6 exist, each on M5 or 1/8 in PT, so your neighbours are the M5-threaded Dia 4 mini below (a smaller port for tight manifold pitch) and the Dia 6 mini in the same 1/8 in thread above (a wider bore, and a qualitative step up in capacity tied to that tube). Outside the mini series the standard PTL begins at Dia 6 on 1/8 in if the stainless build is not required. Whichever you pick, fit the controller directly at the cylinder port so the throttled volume of air stays small and the stroke responds crisply.
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 PTL Exhaust Throttle Type Speed Control Valve PTL401B-MS FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable under vacuum to -750 mmHg (10 Torr), operating temperature -20 to +70 C. It takes Dia 4 soft nylon or polyurethane tube on a 1/8 in PT thread, in grey as standard, with a SUS304 throttling column and stainless spring gasket. These are the same ratings as the standard PTL line - the -MS suffix changes materials, not pressure figures.
No tool is needed to adjust - press the cap to release it and slide it to set the speed. AirTAC publishes a torque only for installing the cap itself, and for the 1/8 in size on this mini it is 0.08 N.m; overtightening risks damaging the POM cap. Remember a speed controller is not a shut-off valve: it can weep slightly when fully closed, so only the PHV finger valve should be used to isolate a circuit.
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