Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD 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 PTL601BD
The PTL601BD is a push-lock speed controller that throttles air in one direction and lets it pass freely in the other, so you can set how fast an actuator strokes. The B suffix makes this the meter-in version: air flowing from the 1/8in PT thread port out through the Dia 6mm tube runs unthrottled, and the return path is where the restriction sits. AirTAC's catalogue guidance is that meter-out is the first priority for double-acting cylinders, so reserve this B code mainly for single-acting, spring-return actuators where controlling the supply air gives the smoother result.
Instead of a rotating knob, the adjustment is a push-lock cap: press to release, turn to set the throttle, press again to lock. The cap needs only 0.08 N.m of seating torque on this 1/8in size, so over-tightening by hand is the real risk, not under-tightening. The grey-bodied standard becomes black with the D suffix, and the internals follow the PTL recipe: POM adjusting cap, brass throttling body and a brass throttling column. The tube outlet is fixed in one direction, in the PSL footprint.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD |
|---|---|
| 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 PTL601BD
| 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 PTL601BD Is Used
Spring-return clamp on a packaging machine
A single-acting clamp arm closing onto printed cartons needs its supply air throttled, not its exhaust. The B meter-in flow path and a locked push cap keep the gentle closing speed set between shifts.
Cap-press head on a bottling line
A spring-return press head seating closures onto bottles must descend at a controlled pace. Dia 6mm polyurethane tubing from a compact manifold feeds this 1/8in PT controller mounted at the cylinder port.
Stack jogger on a print finishing line
A single-acting pusher squaring paper stacks cycles thousands of times per shift. Meter-in control smooths the approach, and the black D body blends with painted machine frames where grey hardware stands out.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD the Right Part?
Start with the control method: if your actuator is double-acting and driven by a solenoid valve, step to the A code (PTL601AD) for meter-out cushioning. The B meter-in code here is the cleaner choice on single-acting spring-return cylinders, where supply-side throttling avoids the stick-slip that meter-in causes on double-acting hardware under varying load. If your fitters get paged to re-adjust settings that knobs have been knocked out of, this push-lock cap is the reason to pick PTL over PSL.
This Dia 6 tube with 1/8in thread sits mid-ladder. The tube step up is PTL801B (Dia 8, same 1/8in thread); the thread step up is PTL602B (Dia 6 tube on 1/4in thread). Downwards, Dia 6 is the smallest tube AirTAC lists on the standard PTL at 1/8in, and the only route to Dia 4 is the separate mini PTL-M series, which also opens up an M5 thread option. Fit the controller directly at the cylinder port so the volume of throttled air stays small and the response to each adjustment is immediate.
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 PTL601BD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, temperature range -20 to +70 C. This code is the Dia 6mm tube size with a 1/8in PT thread, B meter-in control, and the D suffix black body. It takes soft nylon or polyurethane tubing and shares the same ratings across the whole PSL/PSS/PSA/PTL/PHV kit.
Press the cap down to release the adjustment, turn it to set the throttle for your stroke, then press again so the cap locks the setting against vibration. AirTAC publishes a seating torque for the PTL push-lock cap, and on this 1/8in thread size it is 0.08 N.m, so seat it lightly rather than wrenching it. Remember this is a speed controller, not a shut-off valve: it is designed to leak slightly when fully closed, so use a PHV finger valve if you need true isolation.
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