Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B 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
The PTL603B is a push-lock speed controller that sets how fast an actuator moves by throttling air in one direction while letting it pass freely in the other. This B-coded part is the meter-in version: air flows unthrottled from the 3/8in PT thread port into the Dia 6 tube, and the restriction sits in the return path. AirTAC positions meter-in for single-acting cylinders, where the spring or gravity returns the rod and there is no trapped back-pressure to work against.
Adjustment is a push-lock cap rather than a knob: press the cap to unlock and set the flow, then release it and the cap holds its position. The cap is a friction lock, so a passing arm, hose snag or vibration is far less likely to disturb a setting than with a plain knob. Body materials are a POM adjusting cap over a brass throttling body and brass throttling column, with an NBR seal against the thread.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B |
|---|---|
| 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 PTL603B
| 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 PTL603B Is Used
Spring-return clamp on a bench press
A single-acting clamping cylinder pressing a gasket into a housing needs the supply side open for a fast approach and a damped return so the spring does not snap the rod back. Meter-in on the PTL603B does exactly that, and the push-lock cap keeps the setting through hundreds of cycles.
Glue-dosing ram on a packaging line
A small single-acting ram that dips into a glue pot must descend at a controlled pace or it splashes beads onto the carton. The Dia 6 tube suits the short 6mm lines common around dosing heads, and push-lock adjustment lets an operator re-time the dip without tools.
Lift-assist damper on a lab fixture
A spring-return lift cylinder raising a microscope carrier plate must lower slowly and evenly. Because the return stroke is gravity-driven, meter-in control on the supply path gives the gentle descent, and the 3/8in PT thread drops straight into the fixture manifold.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603B the Right Part?
Meter-in (this B model) is the right pick for a single-acting cylinder: the supply side runs free so the stroke fills fast, and the controlled return path damps it. On a double-acting cylinder driven by a solenoid valve, choose meter-out (the A suffix) instead - AirTAC calls meter-out the first priority because throttling the exhaust leaves a back-pressure cushion and stops stick-slip under varying load. The straight body shapes PSA and PTA have no A or B suffix in their order codes at all, so this control-method choice exists only in threaded bodies like the PTL.
Sizing: on the 3/8in thread ladder for PTL, Dia 6 is the smallest tube offered - there is no Dia 4 below it on this thread - and stepping up goes to Dia 8, then Dia 10 and Dia 12. If you want Dia 6 on a smaller thread, the 1/4in PTL ladder also carries Dia 6; the 1/2in ladder starts at Dia 8, so no Dia 6 exists there. Fit the controller directly at the cylinder port so only the small trapped volume is throttled, and note the push-lock cap on this thread size should be seated to 0.24 N.m.
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 FAQ
It is a meter-in (B) push-lock speed controller for Dia 6 soft nylon or polyurethane tube with a 3/8in PT thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, and temperature -20 to +70 C. Standard colour is grey; the D suffix orders black. Push-lock cap seating torque at 3/8in is 0.24 N.m.
Press the cap to release the adjustment mechanism, set the flow, then release the cap and it holds that position; AirTAC publishes a 0.24 N.m seating torque for the 3/8in size. Note it is not a shut-off valve: like every speed controller in this catalogue, a fully closed PTL still weeps slightly by design. For true isolation use the PHV finger valve, which is a quarter-turn shut-off with no -S variant and is copper-free as standard.
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