Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B 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 PTL804B
The PTL804B is a push-lock speed controller that throttles air in one direction and lets it run free in the other, so you can set how fast an actuator strokes without touching the valve signal. This code ends in B, which makes it a METER-IN controller: flow from the 1/2in PT port into the tube passes freely, while flow leaving the tube back toward the port is restricted. Meter-in control is AirTAC's recommended match for single-acting cylinders, where the return spring, not back-pressure, does the reversing work.
Adjustment is by push-lock cap: press the grey POM cap, turn it to set the restriction, release, and it holds its position even under machine vibration. The body is brass with a brass throttling column, fitted with a Dia 8mm one-touch tube port and a 1/2in PT parallel thread. Note that the 1/2in port on this model dwarfs the 8mm bore - it exists so you can screw straight into a large port block already machined on your machine. The valve is rated 0 to 1.0 MPa, tolerates -750 mmHg vacuum, and works from -20 to +70 C.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B |
|---|---|
| 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 PTL804B
| 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 PTL804B Is Used
Spring-return clamp on a carton sealing line
A single-acting clamp closes onto folding cartons at a set pace; meter-in control softens the closing stroke so the flap is pressed, not slammed.
Ejector cylinder on an injection-mould fixture
The spring-return eject pushes finished parts out of the cavity; the push-lock cap keeps the stroke speed locked once the cycle time is proven.
Pneumatic stop gate on a bottling conveyor
A single-acting gate drops to stop bottles between filling stations; meter-in restriction sets the drop rate so bottles are caught, not knocked over.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B the Right Part?
Choose meter-in (B) if your actuator is single-acting - a spring-return clamp, an air-spring, a single-port ram. For a double-acting cylinder driven by a solenoid valve, AirTAC's guidance is that meter-out is the first priority, so pick the A version of this same body instead. Push-lock suits positions where a plain knob could be nudged off its setting by a passing operator or vibration; if you re-tune speeds every changeover, a knob-type PSL is faster to set by hand.
On the 1/2in thread ladder this model sits between the PTL1004B (Dia 10 tube) below it and the PTL1204B (Dia 12) above it - stepping up the bore increases the free-flow capacity of the fitting. If your port is actually 1/4in, the PTL802B gives you the same Dia 8 tube on the smaller thread. Mount the controller directly at the cylinder port: the volume of air being throttled then stays small and the speed response is crisp. Never use this valve as a shut-off - a fully closed speed controller still weeps slightly by design.
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 PTL804B FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2); usable under vacuum to -750 mmHg (10 Torr); proof pressure 1.5 MPa; operating temperature -20 to +70 C. This SKU is a meter-in (B) push-lock speed controller with a Dia 8mm one-touch tube port and a 1/2in PT thread, grey as standard. Soft nylon or polyurethane tubing. AirTAC publishes flow for this family as characteristic curves only - no Cv or L/min figure exists, and capacity rises with tube bore.
AirTAC publishes an exact torque for the push-lock cap: 0.32 N.m for this 1/2in size. That is firm finger-plus-tool pressure - over-tightening distorts the POM cap and can lock the adjustment permanently. To release the tube, press the cap ring toward the body first, which frees the collet, then pull the Dia 8 tubing out straight.
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