Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-MS
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-MS 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-MS
The PTL4M5B-MS is the smallest stainless speed controller AirTAC builds: a mini push-lock body that throttles air to a Dia 4 mm tube through an M5 port. It slows the actuator in one direction while letting air pass freely the other way, and the B code marks it as meter-in - flow from the M5 port into the tube runs at full bore, and only the return path is restricted. Meter-in is the correct choice for a single-acting cylinder, where the spring does the return and there is no exhaust air to cushion. Applied to a double-acting cylinder it can cause stick-slip under a varying load, so keep this code for spring-return duty.
This -MS variant swaps the brass throttling column for SUS304 and carries a stainless spring gasket, which strips copper from the wetted flow path. Instead of a knurled knob it uses a push-lock cap: press to release, set the orifice, release again, and the cap locks the setting against vibration. The published tightening torque for the M5 push-lock cap is 0.05 N.m - a finger-firm press, nothing more. It runs on soft nylon or polyurethane tubing at 0-1.0 MPa and is rated down to -750 mmHg, so it also works on light vacuum pick-up circuits.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-MS Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-MS |
|---|---|
| Type | Push-lock speed controller, threaded elbow |
| Series | PTL |
| Adjustment | Push-lock adjusting cap (POM) |
| Orientation | Fixed tube direction |
| Body material | Stainless steel 304 (-S variant) |
| 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. Stainless (-S): SUS304 throttling column and body parts in place of brass, for copper-free environments. Ratings are unchanged from the standard version. 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-MS
| 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. |
| -S | Stainless-steel body. |
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-MS Is Used
Electronics test fixture clamp
A small single-acting clamp pressing a probe board onto a PCB test point needs a gentle, repeatable close. Meter-in control of the 4 mm line sets the press speed; the SUS304 column suits flux and cleaning-agent environments.
Compact glue-dot dispenser head
On a benchtop dosing rig, the spring-return dispense stroke is timed by restricting the return with this mini controller, while the push stroke stays free-flowing through the M5 port.
Copper-free sample handling gripper
A miniature gripper lifting vials in a plating or analytical lab avoids brass in the air path. The SUS304 throttling column and stainless gasket keep the metered line free of copper contact.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL4M5B-MS the Right Part?
Dia 4 mm is the bottom of the mini ladder, so there is no smaller step - the only neighbour upward is Dia 6, as PTL6M5 or PTL6M5-MS on the same M5 port, or step to the PTL4-01 mini which trades M5 for a 1/8in PT thread on the same 4 mm bore. Going up to Dia 6 raises the free-flow capacity and spreads the adjustment range over a larger bore, which makes fine metering of a tiny cylinder slightly coarser; staying at Dia 4 keeps the throttle sensitive on sub-10 mm actuators.
Choose this push-lock format over the PSL knob type when the setting must survive a wash-down hose or a bumped panel: the locked cap cannot be turned casually by hand. Because it is a meter-in code, mount it at the cylinder port so the controlled volume stays small and the stroke response stays crisp. Note that a speed controller is not a shut-off - it weeps slightly fully closed; use a PHV finger valve where a circuit genuinely needs isolating.
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-MS FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure down to -750 mmHg (10 Torr), operating temperature -20 to +70 C. This SKU is a mini push-lock speed controller for Dia 4 mm soft nylon or polyurethane tubing on an M5 thread, code B = meter-in, with a SUS304 throttling column and stainless spring gasket in place of the standard brass parts.
AirTAC publishes the cap tightening torque as 0.05 N.m for the M5 size - press the cap down to release, set the needle, then release; a torque beyond that value distorts the POM cap. Fit soft nylon or polyurethane tube only, push it fully home before locking, and remember the B code throttles the tube-to-port direction, so orient the body accordingly at the cylinder port.
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