Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204A
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204A 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 PTL1204A
The PTL1204A is a push-lock speed controller that throttles air leaving a large cylinder port while letting the supply side flow through unhindered. The A suffix marks meter-out control: air passing from the 1/2in PT thread port to the Dia 12 tube is restricted, and the return direction runs free. AirTAC treats meter-out as the default choice because back-pressure held on the exhaust side cushions a double-acting cylinder and keeps the stroke smooth under varying load.
Instead of a knurled knob, this body carries a push-lock cap: press it to unlock, turn to set the orifice, and press again to lock the setting against plant vibration. The published seating torque for the 1/2in cap is 0.32 N.m, so hand pressure alone is enough - no spanner. The thread is PT taper, which seals on the thread form itself, and the 12mm one-touch port takes soft nylon or polyurethane tubing straight in. Fully closed, it still weeps a trace of air by design; it is a flow control, never an isolation valve.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204A Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204A |
|---|---|
| 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 PTL1204A
| 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 PTL1204A Is Used
Palletiser layer pusher
A Dia 12 feed on a 1/2in port gives the throughput a full layer-push cylinder needs, and meter-out throttling stops the pusher lunging when it meets the carton stack.
Case-pack ejector
On a corrugated case ejection stroke the push-lock cap keeps the gentle-landing speed locked even where panel vibration would shake a plain knob off its setting.
Tail-lift ramp damper
Meter-out control lets a vehicle-mounted ramp cylinder descend slowly to the dock floor while the free return direction raises it quickly between deliveries.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL1204A the Right Part?
Meter-out (this A version) suits a solenoid-driven double-acting cylinder; a meter-in B type only suits single-acting jobs, where it avoids stick-slip. Choose push-lock over a knob type when settings must survive fork-truck bumps and panel rattle, and choose a knob PSL/PSS instead when operators retune speeds many times a shift. This is the largest tube in the PTL 1/2in ladder: stepping down to PTL1004A (Dia 10) trims flow for a mid-size bore, while staying on Dia 12 but dropping the thread to PTL1203A gives a 3/8in port for compact valving. Mount the controller directly at the cylinder port so only the short stub between it and the chamber holds throttled air - the smaller that volume, the crisper the speed setting.
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 PTL1204A FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable vacuum to -750 mmHg (10 Torr), ambient and media temperature -20 to +70 C. Tube side is Dia 12 one-touch for soft nylon or polyurethane tubing; port side is 1/2in PT taper thread. Control method A = meter-out, capped by a push-lock lockable head whose 1/2in seating torque is 0.32 N.m.
Press the grey cap to release the lock, turn it to set the flow orifice, then press it back down so the setting cannot creep with vibration; seat it hand-tight to about 0.32 N.m. It throttles but does not seal - a speed controller deliberately leaks slightly when fully closed, so use a proper shut-off valve (such as an AirTAC PHV finger valve) to isolate the circuit.
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