Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603A-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603A-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 PTL603A-S
The PTL603A-S is a stainless push-lock speed controller that throttles air flowing from the 3/8in PT thread port out through the Dia 6 soft nylon or polyurethane tube, while the return direction passes freely. The A code marks it as meter-out, the control method AirTAC recommends first: on a double-acting cylinder driven by a solenoid valve, throttling the exhaust builds a back-pressure cushion, so the piston is carried on trapped air instead of running away on the supply side. The result is a stroke that stays smooth even when the load shifts mid-travel.
The Sus304 throttling column replaces the brass part of the standard PTL603A, and the body is aluminium alloy or Sus304, so the wetted trim is stainless where corrosion or copper carry-over would otherwise be a problem. Adjustment is by push-lock cap, not a knob: pull the cap up, turn to set, press it back down and the setting locks against vibration. AirTAC publishes a cap seating torque of 0.24 N.m for the 3/8in size, the only torque figure in this catalogue. Every rating is identical to the brass version: 0-1.0 MPa working, 1.5 MPa proof, -750 mmHg vacuum, -20 to +70 C.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603A-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603A-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 PTL603A-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 PTL603A-S Is Used
Bottling line grip arm
On a rinsing conveyor the gripper arm must close at a set pace onto glass bottles every cycle. Meter-out throttling cushions the close stroke, and the Sus304 trim tolerates the caustic rinse water sprayed across the machine frame.
Electroplating line pusher
Plating tanks use pneumatic pushers to index jigs through rinse and bath stations. Copper-free stainless construction keeps brass ions out of the process chemistry, and the push-lock cap holds its setting against the humid, corrosive atmosphere over the tanks.
Truck wash gantry tilt ram
The tilt ram on an automatic vehicle-wash gantry lowers slowly enough for the brushes to engage without snagging. The Dia 6 tube on a 3/8in port suits the compact ram circuit, and stainless survives constant wash-down and road salt residue.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603A-S the Right Part?
This SKU sits at the small-bore end of the PTL 3/8in ladder, which runs Dia 6, 8, 10 and 12. Step down in thread and you get the PTL602A-S, the same Dia 6 tube on a 1/4in PT port - choose it when the cylinder or valve port is 1/4in. Step up in tube on the same 3/8in thread and the next part is the PTL803A-S, Dia 8, which carries more air for faster strokes on larger bores. There is no Dia 6 option at 1/2in, so if your port is 1/2in you must move up a tube size as well.
Push-lock versus knob: the push-lock cap resists being knocked out of adjustment by brushing, wash-down jets or vibration, while a knob type such as the PSL sets faster by hand but relies on its locking cap. Fit the controller directly at the cylinder port rather than back at the valve manifold - the throttled volume is then only the short line between the part and the port, and the stroke responds to each adjustment immediately.
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 PTL603A-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. It fits Dia 6 soft nylon or polyurethane tube on a 3/8in PT thread, with meter-out (A) flow control and a Sus304 throttling column - the same ratings as the brass PTL603A.
AirTAC specifies 0.24 N.m for the 3/8in PTL cap. Pull the cap up to unlock, turn it to the setting you want, then press it down; the torque figure applies to final seating and stops over-compression of the detent. Once locked, the setting resists vibration and wash-down spray far better than a plain knob.
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