Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD-S 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 PTL601BD-S
The PTL601BD-S is a push-lock speed controller that meters air in one direction while passing it freely in the other, so an actuator's stroke speed can be set once and left alone. The B suffix marks this as the meter-in version: air flowing from the 1/8in PT thread port out through the Dia 6 tube runs at full bore, and it is the return flow from tube back to thread that gets throttled. That is the pattern AirTAC recommends for single-acting, spring-return cylinders, where the spring does the work and the valve only needs to tame the powered stroke.
Instead of a knob, the stainless adjusting cap pushes in to set and locks the throttling column against drift, which suits positions where vibration or passing hands would work a plain knob loose. AirTAC publishes a cap tightening torque of 0.08 N.m for the 1/8in size, the only torque figure in this family. The -S build puts a SUS304 column in place of brass inside an aluminium alloy or SUS304 body, and the D suffix orders it in black.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD-S |
|---|---|
| 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) |
| 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 PTL601BD-S
| 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. |
| -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 PTL601BD-S Is Used
Spring-return bench clamp
On a small single-acting clamp at a jewellery or watchmaking bench, the PTL601BD-S throttles the closing stroke so jaws settle gently on finished parts, while the spring return vents freely back through the controller.
Analytical sampler actuator
A compact spring-return cylinder on a lab sampling head needs slow, repeatable advance. The SUS304 column resists corrosive reagent splash, and the push-lock cap keeps the setting through daily wash-downs.
Packaging machine reject gate
A single-acting kick-off paddle on a carton line must flick fast but reset without slamming the frame. Meter-in control on the Dia 6 supply line lets the gate run at conveyor speed without hammering the stop.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601BD-S the Right Part?
Match the control method to the actuator before anything else: meter-in (B) belongs on single-acting cylinders, where controlling the supply stroke is enough and the spring governs the return. On a double-acting cylinder it will tend to stick-slip as the load changes, so choose a meter-out (A) code instead. The push-lock body is the PSL shape, so the tube side points one fixed way; if you need the tube to swivel on installation, the PTS universal series is the swivel equivalent. Note that PTL never offered an M5 option, so 1/8in is the smallest thread you can get in this push-lock family.
On size: at 1/8in thread the PTL ladder runs only Dia 6 and Dia 8, so this Dia 6 part is the smallest push-lock controller AirTAC makes for that thread and there is no step down. Stepping up to PTL801BD-S gains a wider bore and correspondingly more capacity in the free direction. Whichever you pick, fit 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 PTL601BD-S FAQ
Working pressure 0 to 1.0 MPa (0 to 10 kgf/cm2), usable under vacuum down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and an operating temperature range of -20 to +70 C. This SKU takes Dia 6 soft nylon or polyurethane tubing on a 1/8in PT thread and is the meter-in (B) push-lock version with a SUS304 throttling column.
Push the cap in to make the speed change, then tighten to 0.08 N.m, which is AirTAC's published torque for the 1/8in size. Hand-tight plus a light snug is right; there is no need for a long wrench, and forcing past the published torque risks damaging the cap. The lock is what stops vibration walking the setting off, not raw torque.
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