Airtac PTL Exhaust Throttle Type Speed Control Valve PTL602A-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL602A-S 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 PTL602A-S
The PTL602A-S is a SUS304 stainless push-lock speed controller with a Dia 6 one-touch tube on one side and a 1/4in PT male port on the other. The A suffix marks it as meter-out: air flowing from the 1/4in thread port into the tube is throttled, while the return direction passes freely. This is the arrangement AirTAC recommends first, because on a double-acting cylinder driven by a solenoid valve the throttled exhaust builds a back-pressure cushion and the stroke stays smooth instead of lunging under a changing load. The same body in the B version would instead suit single-acting cylinders.
Adjustment is via a push-lock cap rather than a knob: pull the cap up to release it, turn it to set the speed, then press it back down so vibration cannot creep the setting. AirTAC publishes the recommended cap torque for the 1/4in size as 0.16 N.m. In this -S variant the brass throttling column of the standard PTL is replaced with SUS304, so the wetted construction is copper-free and corrosion-resistant for plating lines, electronics assembly and wash-down cells. Pressure, vacuum and temperature ratings are identical to the standard part.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL602A-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL602A-S |
|---|---|
| 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) |
| 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 PTL602A-S
| 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. |
| -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 PTL602A-S Is Used
PCB tray lift gantry
On an SMT line gantry that lowers loaded PCB trays, the meter-out A throttle cushions the descent through the 1/4in port so boards are not dropped onto the magazine rail. The SUS304 column suits electronics plants where brass particles or copper salts are unacceptable near assembly.
Anodising line clamp arm
A clamp cylinder that closes onto freshly anodised aluminium extrusion needs a gentle final approach; the push-lock cap holds that setting through rack vibration, and the copper-free stainless body is appropriate where wet chemical treatment would attack brass.
Carton indexing pusher
A pneumatic pusher that indexes cartons across a packaging conveyor is timed by throttling meter-out flow; pressing the cap down locks the cycle speed so the pusher stays synchronised with the belt through a full shift.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL602A-S the Right Part?
Sizing this thread: on the 1/4in PT port the PTL ladder runs Dia 6, 8 and 10, and Dia 6 is the smallest tube offered, so there is no step down within this thread. Step up to PTL802A-S (Dia 8) when the cylinder port or tubing run is bigger. If your machine already uses 1/8in ports, the same Dia 6 tube exists as PTL601A-S with a smaller thread; the tube bore stays the same and only the sealing port changes. Fit the controller directly at the cylinder port so the small throttled air volume reacts quickly and gives fine speed control.
Choose push-lock over the knob-style PSL when settings must survive vibration or tampering, and choose this inline thread-in shape when the port itself is the mounting point. AirTAC's own guidance is that meter-out is the first priority, so this A version is the default choice for double-acting cylinders; only pick a B code for single-acting actuators. Soft nylon or polyurethane tubing both suit the push-in collet.
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 PTL602A-S FAQ
It is a Dia 6 tube, 1/4in PT thread, meter-out (A) push-lock speed controller in the -S stainless variant, with the SUS304 throttling column replacing the standard brass one. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, and operating temperature -20 to +70 C. Use soft nylon or polyurethane tubing. Ratings are the same as the standard PTL602A - the -S changes materials, not performance.
No. A speed controller is designed to throttle flow in one direction and pass it freely in the other; even fully closed it can weep slightly by design, so it must never be relied on to isolate a circuit. For a manual shut-off in the same stainless line, use an isolating valve instead. Also note the correct cap torque when adjusting: 0.16 N.m for this 1/4in size - overtightening the push-lock cap damages the POM mechanism.
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