Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD 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 PTL603BD
The PTL603BD throttles air in one direction and lets it pass freely in the other, so you set the stroke speed of a cylinder without adding a separate check valve. This code carries the B suffix: flow from the 3/8in PT thread port into the Dia 6 tube runs free, while the return path from tube to thread is throttled - meter-in control, marked B on the cap. AirTAC positions meter-out as the default for double-acting cylinders, but meter-in is the right call when the actuator is single-acting and returns by spring, because controlling the supply side is what stops the spring from slamming the stroke home.
Instead of the knurled knob used on PSL parts, this push-lock version has a low-profile POM cap: press to release, turn to set, press again to lock the setting. That cap is what makes it suit tight machine frames where a hand could brush a plain knob out of adjustment. AirTAC publishes an installation torque for the push-lock cap, and at the 3/8in size it is 0.24 N.m - hand-tight plus a short nip, no tools beyond that. The D suffix means the body is black rather than the standard grey, which helps it disappear against black machine castings or colour-code a meter-in circuit on a mixed panel.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD |
|---|---|
| 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 PTL603BD
| 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 PTL603BD Is Used
Spring-return stamping press clamp
A single-acting clamp cylinder on a stamping die closes by air and opens by spring. Meter-in throttling of the supply stroke stops the clamp foot from hammering the die surface, and the push-lock cap holds the setting through hours of press vibration.
Glue dispense head return
On a packaging line, a spring-return dispense head must rise at a controlled pace so the bead does not string. The Dia 6 tube feeding a compact head keeps the controlled volume small, so one turn of the cap gives a visible change in lift speed.
Tail-lift safety bar delay
Mobile tail-lift and gate equipment uses small-bore spring-return rams for barrier arms. The black finish and low push-lock profile suit painted steel frames, and the 3/8in port matches the block-mounted valves common on vehicle-mounted power packs.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD the Right Part?
Meter-in is the correct choice for single-acting, spring-return actuators: press cylinders, spring-return clamps, simple lifters. If your cylinder is double-acting driven by a solenoid valve, choose the A-suffix meter-out version instead - meter-in on a double-acting cylinder under changing load tends to stick-slip, while meter-out holds a back-pressure cushion that keeps the stroke smooth.
Sizing both ways: one thread step down is the PTL602BD at 1/4in PT on the same Dia 6 tube, and one tube step up at this thread size is the PTL803BD on Dia 8. Note there is no step up in thread with Dia 6 - the 1/2in PTL starts at Dia 8 - so if your port is 1/2in you must move to a larger tube at the same time. Fit the controller directly at the cylinder port so the throttled volume stays small and the speed response stays crisp.
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 PTL603BD 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 the black (D suffix) push-lock speed controller for Dia 6 soft nylon or polyurethane tube with a 3/8in PT thread, meter-in (B) control, push-lock adjustable cap.
AirTAC publishes an installation torque for the push-lock cap by thread size; at 3/8in it is 0.24 N.m. Snug it to that and no further - overtightening does not improve sealing on the tube grip. Because the cap must be pressed down before it will rotate, a passing hand or hose movement cannot back it out of adjustment the way it can with a plain knob, which is the main reason to pick this type over the PSL knob version.
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