Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204BD
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204BD 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 PTL1204BD
The PTL1204BD is a universal speed controller with a Dia 12mm push-in outlet and a 1/2in PT male thread. Its push-lock cap replaces the knurled knob used on the PSS family: press the cap to lock the setting, so vibration or a knocked sleeve cannot drift your cylinder speed. The B suffix marks meter-in control - air flowing from the 1/2in thread port through to the 12mm tube runs free, while the reverse path from tube back to thread is throttled. AirTAC positions meter-in for single-acting cylinders, where a spring returns the ram and controlled filling stops the stroke lunging at the end of travel.
The universal body lets the 12mm tube outlet swivel a full 360 degrees after installation, so tubing can be routed without bending side load into the thread seal. Inside, a POM adjusting cap sits over a brass throttling body and column, and this D-suffix part is moulded black instead of the standard grey. Tighten the push-lock cap to 0.32 N.m, the published figure for 1/2in PTL caps, to hold the adjustment reliably.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204BD Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204BD |
|---|---|
| Type | Push-lock speed controller, threaded elbow |
| Series | PTL |
| Adjustment | Push-lock adjusting cap (POM) |
| Orientation | Fixed 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 PTL Exhaust Throttle Type Speed Control Valve PTL1204BD
| 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. |
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 PTL1204BD Is Used
Spring-return bench press ram
On a single-acting bench press, meter-in control fills the cylinder slowly on the working stroke while the spring returns it fast, giving the operator a predictable descent instead of a sudden drop.
Carton case-ejector pusher
A spring-return ejector that nudges cartons off the end of a packaging conveyor needs meter-in filling to time the push to the case pitch, and the 1/2in port matches the larger cylinder bores these pushers use.
HVAC damper louver actuator
Air-driven louver dampers with spring-return actuators open too fast when fed unthrottled; meter-in control on the supply line paces the sweep so the louvers travel smoothly across the duct face.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204BD the Right Part?
Dia 12 is the largest tube the PTL ladder offers on a 1/2in thread; the only smaller tube on that same thread is Dia 10, which suits lighter-duty lines but restricts a big-bore cylinder that needs volume. If your port is 3/8in, the PTL1212BD keeps the identical Dia 12 tube on the smaller thread. Whichever size you pick, mount the controller directly in the cylinder port so the throttled air volume stays small and response remains 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 PTL Exhaust Throttle Type Speed Control Valve PTL1204BD FAQ
Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable under vacuum to -750 mmHg (10 Torr), with an ambient range of -20 to +70 C. This SKU is the Dia 12mm tube size on a 1/2in PT male thread, push-lock universal body, meter-in (B) control, in black. It is rated for soft nylon or polyurethane tubing.
No. A speed controller that is screwed fully closed is designed to leak slightly and must never be used to isolate a circuit. For a true shut-off, fit an AirTAC PHV finger valve, which is a quarter-turn manual stop valve.
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