Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-M
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-M 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 PTL4M5B-M
The PTL4M5B-M is the smallest speed controller AirTAC builds in the PTL family: a Dia 4 mm push-in tube port on a mini body threaded M5. It sets actuator speed by throttling air in one direction and letting it pass freely in the other. The trailing B makes this a meter-in unit, marked B on the cap: flow from the M5 thread port to the tube runs wide open, while the return path is throttled. That is the correct choice for a single-acting cylinder driven by a 3-way valve, where air is supplied under control and the spring does the return.
Instead of a rotating knob, the top is a push-lock cap: press it to release the seat, set the throttle, press again to lock. Once locked it resists vibration and accidental contact far better than a plain knob, which matters on small pick-and-place heads where a knocked-out setting costs a full line stop. The adjusting cap is POM and the throttling body is brass. Note that AirTAC publishes the push-lock cap tightening torque for this thread as 0.05 N.m - the lowest figure on the whole torque table - so seat it by hand only.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-M Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-M |
|---|---|
| Type | Push-lock speed controller, threaded elbow |
| Series | PTL |
| Adjustment | Push-lock adjusting cap (POM) |
| Orientation | Fixed tube direction |
| Size class | Mini series (-M) |
| 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 PTL4M5B-M
| 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. |
| -M | Mini series. |
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 PTL4M5B-M Is Used
Vial-handling gripper on a lab autosampler
A small single-acting gripper closing on glass vials cannot be allowed to snap shut. Meter-in control on the supply stroke gives the gentle closing curve a Dia 4 mm line feeds, and the push-lock cap holds that setting through thousands of cycles.
Single-acting clamp on an electronics test fixture
A pogo-pin press clamp driven by a 3-way valve needs controlled press-in speed and a free spring return. The B-meter-in logic matches that circuit exactly, and the M5 thread plugs straight into compact fixture manifolds.
Label applicator head on a packaging line
The tamp pad of a labelling head must descend onto moving cartons at a set speed. The mini body fits the tight head bracket, and because the cap locks down, machine setters can brush past it without losing the stroke timing.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-M the Right Part?
Two ways to size this part. On the tube side, Dia 4 mm is the smallest bore AirTAC makes in any speed controller; there is no size below it, and the next step up in the mini push-lock family is Dia 6. On the thread side, M5 is likewise the smallest option, with 1/8 in (code 01) as the only larger thread in the mini ladder. Stepping either dimension up buys you more free-flow capacity on the unthrottled leg, so a cylinder that struggles to retract fast enough under a spring is the one that justifies the larger size.
Fit the controller directly at the cylinder port rather than back at the valve. Throttling at the port keeps the trapped air volume small and makes the stroke speed repeatable. Use soft nylon or polyurethane tubing only; the push-in collet on the Dia 4 mini body is designed for those, not for rigid pipe.
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 PTL4M5B-M FAQ
It is a mini PTL push-lock speed controller, meter-in (B) direction, with a Dia 4 mm push-in tube port and an M5 PT thread. Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure -750 mmHg (10 Torr), operating temperature -20 to +70 C. Tubing must be soft nylon or polyurethane. Standard colour is grey; a D suffix orders black. The published push-lock cap torque on the M5 thread is 0.05 N.m.
The letter is the control method. B means meter-in: the free path runs from the M5 thread port toward the tube, and the throttled path is the reverse, so the air being supplied to the actuator is the air being restricted. AirTAC recommends meter-out (A) as the default for double-acting cylinders, but meter-in is the right pick for a single-acting cylinder with a spring return. Fitting a B unit to a double-acting cylinder under varying load invites stick-slip, so check your valve and actuator type before ordering.
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