Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD 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 PTL804BD
The AirTAC PTL804BD is a push-lock speed controller that bleeds air off in one direction to set actuator speed while letting flow pass freely the other way. This code carries the B suffix, so it is a meter-in controller: air from the 1/2in PT thread port reaches the Dia 8 tube unrestricted, and the controlled (throttled) side is the return path. AirTAC positions meter-out as the first priority for double-acting cylinders because exhaust throttling builds a back-pressure cushion that keeps strokes smooth. Meter-in, as fitted here, is the correct choice for single-acting cylinders, where there is no opposite-side air to cushion the load. The handle is marked B so the setting cannot be mistaken on a crowded manifold.
Adjustment is a push-lock cap, not a free-spinning knob: pull it up, turn to set the speed, then push it down to lock the setting against plant vibration. AirTAC publishes a cap torque of 0.32 N.m for this 1/2in size, the largest in the push-lock table. The body threads into the 1/2in port and the tube direction is fixed, so plan the tubing run before installation. Like every part in this catalogue it is rated 0-1.0 MPa working, 1.5 MPa proof, -20 to +70 C, and soft nylon or polyurethane tubing only.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD |
|---|---|
| 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 PTL804BD
| 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 PTL804BD Is Used
Spring-return clamp on a packaging machine
A single-acting clamp closing a carton flap onto printed board needs its closing stroke slowed so it seats without creasing. Meter-in control from the 1/2in port throttles the single supply line, and the push-lock cap keeps the setting after operators bump the frame during changeovers.
Bushing insertion press
A small single-acting press pushing brass bushings into plastic housings must descend gently or it skives the bore. The Dia 8 bore handles the short high-force stroke, and meter-in throttling on the supply line gives a controlled, repeatable press rate batch after batch.
Die-lubricant spray arm on a casting cell
A spring-return spray arm sweeping a die face has to travel at a set pace for even coating. The push-lock cap on this PTL holds the travel speed despite the heat and vibration around the casting machine, and the copper-free-friendly Dia 8 polyurethane line flexes with the arm.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD the Right Part?
Choose meter-in (this B model) if the actuator is single-acting, such as a spring-return clamp or ram fed through a single line. If you are driving a double-acting cylinder and see stick-slip under varying load, step to the A version instead. Push-lock versus knob is a workflow decision: the push-lock cap resists being knocked out of adjustment on vibrating frames, while a knob type (PSL) is faster to tweak during set-up trials.
Sizing both ways: on the 1/2in thread ladder, Dia 8 is the smallest tube AirTAC offers, so the only step up within this thread is PTL1004B on Dia 10, which swallows more air per metre of hose for longer lines. If the port itself is smaller, keep the Dia 8 bore and drop the thread: PTL803B on 3/8in or PTL802B on 1/4in both exist. Whichever you pick, mount the controller directly at the cylinder port so the throttled air volume stays small and 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 PTL804BD FAQ
It is a push-lock speed controller in the meter-in (B) configuration, for Dia 8 tubing on a 1/2in PT thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates negative pressure down to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the temperature range is -20 to +70 C. It accepts soft nylon or polyurethane tube only. The push-lock cap torque for this 1/2in size is 0.32 N.m, the highest value in AirTAC's published table.
Pull the cap up to release the adjustment mechanism, turn it to trim the controlled flow, then push it down so the setting is locked. This is why push-lock types survive on vibrating machinery where a plain knob drifts. Remember the B marking means meter-in: the free path runs from the thread port toward the tube, and the throttled path is the reverse. AirTAC publishes controlled and free flow as characteristic curves rather than fixed flow figures, so judge capacity by the Dia 8 bore and prove the setting on the machine.
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