Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B-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 PTL603B-S
The PTL603B-S is a push-lock speed controller with a 3/8 PT thread port on one side and a Dia 6 push-in tube outlet on the other. The B code makes it a meter-in part: air travels freely from the thread port into the tube, and the throttle acts only on flow returning from the tube to the thread. That is the configuration AirTAC recommends for single-acting cylinders, where metering the supply gives a gentler stroke without the stick-slip that meter-in can cause on a double-acting actuator.
Instead of a knob, the push-lock cap is pressed in to unlock, set by hand, and released to lock the setting against vibration - a useful trait on machines where operators lean on panels. The only tightening torque AirTAC publishes for the cap is at this thread size: 0.24 N.m for the 3/8 push-lock. In this stainless version the throttling column is SUS304 in place of the standard brass, so the wetted trim suits wash-down and corrosive atmospheres. Ratings are unchanged: 0-1.0 MPa working, 1.5 MPa proof, -20 to +70 C.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B-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 PTL603B-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 PTL603B-S Is Used
Single-acting clamp on a carton sealing head
A spring-return clamp that presses the flap down on a carton sealer needs a controlled closing speed. Meter-in throttling on this B-code unit lets the clamp ease onto the flap; the spring return runs on the free path back to the 3/8 PT port.
Plating line lift in a corrosive wash zone
On an electroplating jig lifter splashed with acid mist, the brass throttling column of a standard controller corrodes. This SUS304-column variant keeps the metering trim stable in the same Dia 6 circuit without re-rating pressure or temperature.
Tail-lift ramp damper cylinder
A single-acting ramp-lowering cylinder on a delivery truck benefits from meter-in control so the ramp descends at a set pace. The push-lock cap holds its setting over pothole vibration where a loose knob would drift.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B-S the Right Part?
Size ladders matter here: at the 3/8 thread, Dia 6 is the smallest tube AirTAC offers - there is no Dia 4 step below - and the next step up is PTL803B-S on Dia 8. If your port is a 1/4 rather than a 3/8, PTL602B-S gives the identical Dia 6 tube and B control on the smaller thread. Step up a tube size when the cylinder bore grows and you want more free-flow area on the uncontrolled stroke. Choose B (meter-in) for single-acting, spring-return actuators; pick the A code instead if a double-acting cylinder is being driven and you need exhaust back-pressure for a smooth stroke. Mount the controller directly at the cylinder port so the throttled air volume stays small and response stays crisp, and remember that a speed controller is not a shut-off valve - only the PHV finger valve isolates a line.
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 PTL603B-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is Dia 6 tube x 3/8 PT thread, push-lock cap, control method B (meter-in), with an SUS304 throttling column replacing the standard brass column. Applicable tubing is soft nylon or polyurethane, and the push-lock cap tightening torque at 3/8 is 0.24 N.m.
AirTAC advises the opposite pairing. Meter-in control on a double-acting cylinder tends to stick-slip under varying load because the far chamber is not pressurised. For double-acting actuators choose the A suffix (meter-out), which throttles exhaust and keeps a back-pressure cushion for a smooth stroke. Meter-in B, as on this part, is the correct match for single-acting, spring-return cylinders.
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