Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5BD-M
The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5BD-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 PTL4M5BD-M
The PTL4M5BD-M is a mini push-lock speed controller in AirTAC's PTL family, built for Dia 4mm soft nylon or polyurethane tubing and an M5 thread port. It throttles air in one direction while letting it pass freely in the other, so you set the stroke speed of a cylinder or gripper without adding a separate valve. The B suffix makes this the meter-in version: flow from the M5 thread port into the tube runs free, and the throttling happens as air returns from the tube toward the port. AirTAC's own guidance is that meter-out is the first priority for double-acting cylinders, but meter-in is the correct pick for a single-acting, spring-return actuator, where there is no exhaust cushion to throttle.
Instead of a knob, the cap is push-lock: press it to release, set the position, then push again to lock, so the setting resists being knocked by hands or swarf. The published locking torque for an M5 push-lock cap is 0.05 N.m, which tells you how little force the mechanism is designed around. The -M marks it as a mini body, made only in Dia 4 and Dia 6 with M5 or 1/8in threads, and the D suffix means black rather than the standard grey. Keep in mind that a speed controller is not a shut-off valve; it leaks slightly when fully closed by design, so use a PHV finger valve where a circuit must actually be isolated.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5BD-M Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5BD-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 PTL4M5BD-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 PTL4M5BD-M Is Used
Spring-return micro gripper
A single-acting gripper on a compact pick head closes against a spring, so meter-in throttling of the return side is the right control direction. The Dia 4mm bore and M5 port suit the tiny cylinder ports on these assemblies.
Lab reagent dispensing head
A small dispensing needle lift driven by a single-acting cylinder must lower gently to avoid splashing. Meter-in control sets the downstroke, and the mini body tucks into the tight head assembly.
Jig clamp on polished parts
A spring-return jig clamp closing on a polished or anodised surface needs a soft approach, not a slam. The push-lock cap holds the set speed even when the fixture is handled between cycles.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5BD-M the Right Part?
This is the smallest tube in the whole PTL range, so there is no Dia 4 neighbour below it. Stepping up to Dia 6 gives you the PTL6M5B-M on the same M5 thread, with more flow capacity to feed a slightly larger actuator; staying on Dia 4 but moving to a 1/8in thread gives the PTL401B-M if your port is a PT thread rather than an M5 face. If your cylinder is double-acting, reconsider the control direction first: a meter-out A-code variant holds a back-pressure cushion and gives a smoother stroke, while meter-in on a double-acting cylinder tends to stick-slip under changing load.
Mount the controller directly at the cylinder or gripper port rather than back at the valve manifold. The throttled air volume is then only the short tube span between controller and actuator, which makes speed adjustments predictable and repeatable.
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 PTL4M5BD-M FAQ
It is a mini push-lock speed controller with meter-in (B) control, a Dia 4mm tube connection and an M5 thread port, finished in black (D suffix). Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure is -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the temperature range is -20 to +70 C. It is for soft nylon or polyurethane tubing. AirTAC publishes flow for this family as characteristic curves only, not as a Cv or Kv figure.
AirTAC publishes a locking torque of 0.05 N.m for M5 push-lock caps on the PTL mini series. The mechanism is deliberately small, so no tools or extra force are needed: press the cap to release, make the adjustment, and press back to lock. Overtightening is unnecessary and risks damaging the POM cap. Note also that the PTL is not a shut-off valve; it leaks slightly when fully closed, so use a PHV finger valve where true isolation is required.
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