Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803A
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803A 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 PTL803A
The PTL803A is a push-lock speed controller that meters air on a Dia 8 soft nylon or polyurethane tube and screws into a 3/8in PT port. The A suffix marks it as a meter-out type: air flowing from the thread port out to the tube is throttled, while the return direction passes freely. AirTAC treats meter-out as the default choice because throttling the exhaust of a double-acting cylinder builds a back-pressure cushion, which keeps the stroke smooth even under a varying load.
Instead of a twist knob, this version uses a push-lock adjusting cap: press it in to unlock, turn to set the speed, press again to lock. The cap physically resists vibration and accidental contact, so a speed set on a packaging machine frame stays set. AirTAC publishes a fitting torque for this cap - 0.24 N.m at the 3/8in size - and overtightening the plastic POM cap is the most common way to damage one. Note that a speed controller is not a shut-off valve: fully closed, it still weeps slightly, so use a PHV finger valve where isolation matters.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803A Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803A |
|---|---|
| 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 PTL803A
| 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 PTL803A Is Used
Conveyor indexing pusher
A 3/8in-ported pusher cylinder that kicks cartons between conveyor lanes is throttled at the exhaust so the extend stroke is fast enough for the pitch but never knocks the leading carton off the lane divider.
Glass panel pick-and-place
On a gantry lowering suction-cupged glass sheets onto a stillage, the PTL803A meters the descent of the Dia 8 drop cylinder so the panel settles instead of being dropped the last few millimetres.
Gentle clamp on anodized lids
A swing clamp closing an anodized enclosure lid is metered meter-out so the final approach presses the gasket progressively rather than impact-marking the finish on the aluminium.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803A the Right Part?
Pick meter-out (this A version) when a solenoid valve drives a double-acting cylinder and the stroke must stay even; pick the PTL803B meter-in variant instead for single-acting cylinders, where there is no exhaust to cushion. On the 3/8in thread rung of the PTL ladder, Dia 8 sits between the PTL603A (Dia 6 tube) below and the PTL103A (Dia 10 tube) above - stepping up increases free-flow capacity through the larger bore, while stepping down suits lighter actuators and shorter runs. Always mount the controller directly at the cylinder port so the throttled air volume stays small and response stays crisp.
If your circuit can tolerate the tube rotating on the fitting, the PTS series offers the same push-lock idea with a 360-degree swivelling body; the PTL803A body is fixed once installed, which is cleaner inside a manifold or machine plate.
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 PTL803A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, ambient and media temperature -20 to +70 C. This SKU is a push-lock meter-out (A) speed controller for Dia 8 mm soft nylon or polyurethane tubing with a 3/8in PT male thread. The adjusting cap is POM plastic, the throttling body and column are brass, and flow data is published as characteristic curves rather than a single Cv figure.
AirTAC specifies 0.24 N.m of torque for the 3/8in push-lock cap - finger-tight plus a small nudge with the palm is enough; a full-hand wrench on the POM cap will crack it. Also, do not treat the closed position as isolation: a speed controller throttles by design and leaks slightly when fully closed. For positive shut-off of the same Dia 8 circuit, add a PHV8A or PHV8B finger valve upstream.
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