Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601A
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601A 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 PTL601A
The PTL601A throttles air leaving your valve so an actuator slows down smoothly, while flow back toward the valve runs wide open. This is the A suffix, meter-out: the controlled direction is from the 1/8in PT thread port out to the Dia 6 tube, and the free direction is the reverse. AirTAC calls meter-out the first priority because throttling the exhaust leaves a back-pressure cushion in a double-acting cylinder, which keeps the stroke steady instead of jerking under changing load. The handle is marked A so operators can confirm the control direction on the machine.
Instead of a screwdriver-set knob, this body carries a push-lock cap: press the Dia 6 tube in to connect it, press the collar to release, and push the cap down to lock the throttle setting so vibration or accidental contact cannot drift it. The cap is POM over a brass throttling body, and AirTAC publishes a tightening torque for it: 0.08 N.m at the 1/8in size. Screw the threaded port into a 1/8in PT outlet on the valve manifold or cylinder head, run 6mm soft nylon or polyurethane tubing into the push-lock end, and the circuit is set.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601A Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601A |
|---|---|
| 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 PTL601A
| 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 PTL601A Is Used
SMT board-transfer pick-and-place
A vacuum gantry lowering onto populated PCBs needs a damped descent. Meter-out on the downstroke cushions the head, and the push-lock collar locks the setting so a bumped cap does not crack boards on the next cycle.
Clamping anodised aluminium extrusions
A pneumatic clamp closing gently on finished extrusion surfaces avoids marking. Throttle the exhaust at the cylinder port with this Dia 6 unit so the jaw lands soft, then lock the cap before the shift starts.
Indexing pusher on a carton conveyor
Timing a pusher to carton pitch on a packaging line is a speed problem. Meter-out control gives a smooth, repeatable stroke into the product, and the 1/8in port threads straight onto compact valve outlets.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601A the Right Part?
On a double-acting cylinder fed by a solenoid valve, meter-out is the safe default, so this A-suffix body suits pick-and-place arms, clamps and pushers that must not slam. If your actuator is single-acting (spring return), the B meter-in variant is the better match; on a double-acting cylinder under varying load, meter-in tends to stick-slip. Choose the push-lock cap over a PSL knob when settings must survive a wash-down hose, an operator's elbow or machine vibration - the knob type is faster to tweak by hand, but this one holds its setting.
Sizing: Dia 6 is the smallest tube AirTAC offers on the PTL ladder at 1/8in, so there is no smaller sibling on this thread - step down physically by moving to a PSA inline type or a mini PTL-M. The next size up on the same thread is Dia 8 (PTL801A), which passes more free flow for the same pressure drop; the other way to grow is keeping Dia 6 and stepping the thread to 1/4in (PTL602A) for a bigger port. Whichever you pick, fit the controller directly at the cylinder port so the throttled air volume 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 PTL Exhaust Throttle Type Speed Control Valve PTL601A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable under vacuum to -750 mmHg (10 Torr), ambient and media temperature -20 to +70 C. This SKU connects Dia 6 mm tubing to a 1/8in PT thread (ordering digit 01) with the A meter-out control method. It takes soft nylon or polyurethane tubing and comes in grey, or black if you add the D suffix.
AirTAC publishes a cap torque of 0.08 N.m for the 1/8in size - snug, not gorilla-tight; overtightening the POM cap is the commonest way people damage these. Do not use the controller as a shut-off valve: it is designed to leak slightly when fully closed. For a real isolation point in the circuit, fit a separate PHV finger valve, which is the actual quarter-turn shut-off in this catalogue.
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