Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401BD-M
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401BD-M 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 PTL401BD-M
The PTL401BD-M is the mini push-lock speed controller for Dia 4 mm soft nylon or polyurethane tubing with a 1/8 in PT port. It throttles air in one direction and lets it pass freely in the other, which is how you set an actuator stroke speed without adding a second component. The B suffix makes this a meter-in type: air flowing from the 1/8 in thread port into the tube runs free, while flow in the reverse direction is throttled. AirTAC's own guidance is that meter-in is the right choice for a single-acting cylinder, where there is no trapped exhaust cushion; putting meter-in on a double-acting cylinder invites stick-slip as the load changes.
Instead of a knob, this mini series carries a POM push-lock cap over a brass throttling body. Push the cap down to release the adjustment, set the speed, and release so the cap locks the setting in place. The published tightening torque for the 1/8 in push-lock cap is 0.08 N.m - do not exceed it. The D suffix means this part is supplied in black rather than the standard grey, which matters on machines where the trim colour has to match.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401BD-M Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401BD-M |
|---|---|
| Type | Push-lock speed controller, threaded elbow |
| Series | PTL |
| Adjustment | Push-lock adjusting cap (POM) |
| Orientation | Fixed tube direction |
| 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. 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 PTL401BD-M
| 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. |
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 PTL401BD-M Is Used
Spring-return assembly clamp
Throttling the return of a single-acting clamp that presses a nylon insulator into a terminal block, so the spring return eases off instead of snapping back and disturbing the assembled part.
Optical stage lift pin
A single-acting lifting pin on a small inspection stage that must descend at a repeatable gentle rate so a camera trigger fires at the same point on every cycle.
Case-eject pusher on a labeller
Metering the return stroke of a single-acting eject pin that nudges labelled bottles onto a takeaway conveyor, timed so bottles arrive upright and unmarked.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL401BD-M the Right Part?
Meter-in B control is the correct pick when the controlled motion is on a single-acting or spring-return actuator and you want to throttle the supply or return path rather than the exhaust. If your actuator is double-acting and driven by a solenoid valve, step to an A meter-out code instead, because throttling the exhaust keeps a back-pressure cushion and a smoother stroke. On the mini PTL ladder, Dia 4 is the smallest size there is: the only neighbour is Dia 6 (PTL601BD-M), which gives you more bore and a wider free-flow path for slightly bigger actuators. The mini series exists only in Dia 4 and Dia 6 with M5 or 1/8 in threads, so there is no step up to a 1/4 in port without leaving the mini family for the standard PTL. Fit the controller directly at the cylinder port so the small throttled air volume responds quickly and keeps the stroke timing tight.
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 PTL401BD-M FAQ
It is a mini PTL push-lock speed controller for Dia 4 mm soft nylon or polyurethane tubing with a 1/8 in PT thread, meter-in B control, black (D) finish. Ratings: working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, temperature -20 to +70 C. Wetted internals include a brass throttling body and a POM adjusting cap.
No. A speed controller leaks slightly when closed by design; it sets speed, it does not isolate a circuit. For a manual quarter-turn shut-off in Dia 4 tubing territory, use a dedicated finger valve, and note that within this AirTAC range the PHV finger valve starts at Dia 6.
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