Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801B
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801B 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 PTL801B
The PTL801B is a push-lock speed controller that meters air in one direction while letting it pass freely the other way. This code carries the B suffix, so it is a METER-IN part: flow from the 1/8in PT thread port out through the Dia 8mm tube runs unrestricted, and the return flow from tube to thread is throttled. Meter-in control suits single-acting, spring-return cylinders, where the spring does the work of retracting and the controller governs the powered stroke. AirTAC's own engineering guidance puts meter-out first for double-acting cylinders, so specify this B version when your actuator is single-acting.
Instead of a rotary knob, the PTL family closes its flow setting under a push-lock cap. Press the cap to unlock, set the throttle, press again and the setting is held against vibration and accidental contact. The cap on this 1/8in thread size should be reseated with about 0.08 N.m of pressure. The adjusting cap is POM plastic over a brass throttling body and brass throttling column, and the tube fits soft nylon or polyurethane with an 8mm outside diameter. Note that this catalogue has no silenced exhaust built in and the part is not a shut-off valve; for circuit isolation use a separate valve.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801B Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801B |
|---|---|
| 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 PTL801B
| 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 PTL801B Is Used
Lid-clamping nest on a tray sealing machine
A single-acting clamp cylinder eased closed by PTL801B meter-in control lets a packaging nest press lids onto trays without denting thinboard, with the push-lock cap holding the set speed through machine vibration.
Sample probe lift on a benchtop test rig
Spring-return probe cylinders on laboratory test benches descend at a controlled rate when the powered stroke is throttled by this meter-in controller, keeping repeatable contact pressure on specimens.
Carton kick-off ejector at a despatch chute
A small single-acting pusher nudging cartons onto a takeaway chute is slowed by the PTL801B so boxes do not tumble; the 8mm bore feeds the short cylinder typically used at chute exits.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801B the Right Part?
Start by matching the actuator: a single-acting cylinder or a circuit where you want the supply side throttled calls for meter-in (this B code); a double-acting cylinder driven by a solenoid valve is better served by the meter-out A version of the same body, because exhaust back-pressure cushions the stroke and prevents stick-slip under varying load. Size-wise on the 1/8in thread, the neighbour below is the PTL601B with a 6mm tube; there is no Dia 10 option on 1/8in, so a larger bore means stepping up to the PTL802B on a 1/4in thread, which buys more free-flow capacity for heavier single-acting loads. Mount the controller directly at the cylinder port so only the small trapped volume between throttle and cylinder is affected by the restriction; fitting it back at the valve wastes much of the control effect on long tube runs.
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 PTL801B FAQ
Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates vacuum down to -750 mmHg (10 Torr), proof pressure is 1.5 MPa and the fluid and ambient temperature range is -20 to +70 C. This code takes an 8mm outside diameter soft nylon or polyurethane tube on a 1/8in PT male thread and controls flow meter-in (B).
AirTAC publishes reseating pressure by thread size; on this 1/8in version press the cap home with about 0.08 N.m. Press once to release the cam that holds the throttle, turn to set the speed, then press again so the setting cannot drift. If you need to vent or isolate the circuit during maintenance, use a separate shut-off such as the PHV finger valve, because a speed controller is not leak-tight when fully closed.
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