Airtac PTL Exhaust Throttle Type Speed Control Valve PTL802B
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL802B 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 PTL802B
The PTL802B is a push-lock speed controller built into a male 1/4in PT thread with a Dia 8mm one-touch tube outlet on top. It slows a pneumatic actuator by throttling air in one direction while letting it pass freely the other way, so a stroke can be tuned without starving the return. This is the B suffix, meter-in: air flowing from the thread port into the tube runs at full bore, and the controlled direction is the reverse, tube back to port. The handle is marked B so nobody re-sets it the wrong way round on the machine.
Meter-in throttling is the standard match for single-acting cylinders, where air is only supplied on the working stroke and a spring or load does the return. AirTAC's own application note pushes buyers toward meter-out on double-acting cylinders, because meter-in on a pressurised-both-sides actuator tends to stick-slip as the load changes. Adjustment is by a POM push-lock cap: press to release, set the position, and the cap holds it firmly against vibration and knocks. The published tightening torque for the 1/4in cap is 0.16 N.m - a figure worth passing to the assembly station.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL802B Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL802B |
|---|---|
| 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 PTL802B
| 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 PTL802B Is Used
Spring-return clamp on a packaging line
A single-acting clamp closing a carton flap needs speed set on the pressurised stroke only. Meter-in control from the 1/4in supply port does exactly that, and the push-lock cap keeps the setting through thousands of cycles.
Glue-head lift on a case sealer
The glue nozzle must descend at a controlled pace onto the flap. This Dia 8 unit handles the main actuator line while its free-flow direction keeps the lift stroke brisk.
Counterweight cylinder on a small press jig
Spring-return counterbalance actuators depend on the supply stroke being metered, not the exhaust. The 8mm bore suits the flexible PU tubing commonly run to bench-mounted jigs.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL802B the Right Part?
Pick meter-in (this B code) if your actuator is single-acting or spring-return; if it is double-acting, step to the A version of the same part for a smoother, back-pressure cushioned stroke. The PTL body shares the PSL footprint but swaps the knob for a push-lock cap - slower to tweak by hand in commissioning, far better at staying put once the line is running. If you want a swivelling tube outlet instead, the PTS range at 1/4in offers Dia 6, 8 and 10. If you want an inline tube-to-tube body with no thread at all, look at PTA8.
Size ladder at the 1/4in thread: Dia 6 sits below this part (PTL602B) for smaller lines and lighter actuators, and Dia 10 sits above (PTL1002B) when the feed needs more breathing room - a larger bore means lower restriction and finer usable adjustment range on big-bore cylinders. Whatever size you land on, screw the controller directly into the cylinder port rather than back at the valve: the throttled air volume stays tiny, so the response to each adjustment is immediate and repeatable.
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 PTL802B FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable vacuum to -750 mmHg (10 Torr), and a fluid and ambient temperature range of -20 to +70 C. The part takes Dia 8mm soft nylon or PU tubing on a 1/4in PT male thread, is meter-in (B) controlled, and is grey as standard with a D suffix for black. Internals include a brass throttling body and POM adjusting cap.
AirTAC publishes a torque table for the PTL and PTL-M push-lock caps, and the 1/4in size used on the PTL802B is 0.16 N.m. Snug it to that figure so the setting cannot drift, and do not over-tighten - the mechanism locks by clamping, not by force. Remember the controller throttles only one direction: with this B code, controlled flow runs from the tube back toward the thread port.
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