Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801BD-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801BD-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 PTL801BD-S
The PTL801BD-S is a push-lock speed controller that throttles air in one direction and lets it run free in the other, so a pneumatic actuator can be slowed to the stroke speed the job needs. This code ends in B, so it is a meter-in part: air flowing from the 1/4in PT thread port into the Dia 8 tube passes unthrottled, while the return path is restricted and marked B on the cap. AirTAC's own application note puts meter-out first for double-acting cylinders; meter-in like this is the natural match for single-acting cylinders, where there is no exhaust-side back pressure to build a cushion.
The -S suffix makes this the SUS304 variant: the throttling column inside is stainless instead of the brass used on the standard line, with the throttling body in aluminium alloy or SUS304 depending on the part. Pressure, vacuum, temperature ratings and dimensions are identical to the standard PTL801BD. The D suffix makes the housing black rather than the standard grey. Unlike a knob type, the push-lock cap is pressed in to release, set, and pushed back down to lock, and it resists being knocked out of adjustment by vibration or a passing hand.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801BD-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801BD-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 PTL801BD-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 PTL801BD-S Is Used
Spring-return clamp on a packaging machine
A single-acting clamp that presses a lid or carton flaps shut needs a controlled closing stroke, not a slam. Meter-in control on the supply side gentles the advance while the spring returns it quickly, and the push-lock cap stops operators nudging the setting between batches.
Plating and electrochemistry transfer arm
On plating lines, copper in the air path can contaminate process baths and catalyse unwanted reactions. The SUS304 throttling column in place of brass suits this copper-reduced duty, and the 1/4in PT thread drops straight onto a rack-lift cylinder port.
Wash-down food tray indexer
A single-acting pusher that indexes bakery trays onto a conveyor must be timed to the chain pitch. This controller lets a line technician set the push speed once and lock it; the stainless internals and -20 to +70 C rating cope with caustic hose-down around the machine frame.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801BD-S the Right Part?
Meter-in (B) is the right choice when your actuator is single-acting - a spring-return clamp, a ram lifting against gravity, a diaphragm actuator. If you are driving a double-acting cylinder, choose the A (meter-out) version instead, because meter-in on a double-acting cylinder tends to stick-slip as the load changes. Note that the PTL body holds the tube in one fixed direction; if you need the fitting to swivel 360 degrees on the thread, step across to the PTS universal family.
This Dia 8 / 1/4in code sits mid-ladder for the 1/4in PTL group, which is offered in Dia 6, Dia 8 and Dia 10. Step down to the PTL602BD-S when the cylinder port or tubing run is smaller and you want a tighter throttled volume; step up to the PTL1002BD-S for a larger bore feeding a heavier actuator. Whichever you pick, mount the controller directly at the cylinder port - throttling there keeps the controlled air volume small and the speed response 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 PTL801BD-S FAQ
It is a meter-in (B) push-lock speed controller for Dia 8 mm soft nylon or polyurethane tubing on a 1/4in PT thread, with SUS304 stainless internals and a black (D) housing. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates negative pressure down to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the operating temperature range is -20 to +70 C. As a push-lock type it is locked by pressing the cap down after setting; the published tightening torque for the 1/4in push-lock cap is 0.16 N.m.
No on both counts. In the B (meter-in) direction only the path from tube back to thread is throttled; flow from the thread into the tube runs free, so it will not regulate both ways. And no speed controller in this catalogue is a shut-off valve - the needle leaks slightly by design when fully closed. If you need to isolate a circuit by hand, use the AirTAC PHV finger valve, which is a true quarter-turn shut-off.
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