Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801A-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801A-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 PTL801A-S
The PTL801A-S is a stainless-steel push-lock speed controller that throttles air in one direction and lets it run free in the other, so you set how fast a cylinder or gripper moves instead of letting it slam. This is the A code, meter-out: flow from the 1/8in PT thread port to the Dia 8 tube is restricted while the return path is unrestricted. AirTAC treats meter-out as the first choice because throttling the exhaust of a double-acting cylinder builds a back-pressure cushion that keeps the stroke smooth instead of stick-slipping under a shifting load.
Adjustment is a push-lock cap, not a rotating knob: press to release, turn to set, press again and the setting stays put even on a machine that shakes. In this -S variant the throttling column is SUS304 stainless steel instead of brass, so the wetted path is copper-free and suited to plating baths, electronics assembly and other places where copper contamination matters. Ratings are identical to the standard part: 0-1.0 MPa working pressure, -20 to +70 C.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801A-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801A-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 PTL801A-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 PTL801A-S Is Used
Plating-line jig hoist
On an electroplating or anodising line, the jig-lift cylinder rises through acid mist that attacks brass. The SUS304 throttling column and copper-free path of the PTL801A-S let the jig descend slowly into the tank without corrosion or copper pickup in the bath.
PCB depaneling press
A depaneling cylinder cutting boards off a PCB panel must land gently or it chips solder joints. Meter-out control on the exhaust side cushions the downstroke, and the push-lock cap keeps the set speed fixed despite the press's vibration.
Bottling-capper take-off arm
A take-off arm that pulls filled bottles off a capper needs its retract speed timed to the conveyor pitch. Fitted at the arm's port with Dia 8 tubing on 1/8in thread, the stainless column copes with washdown splash that would pit a brass part.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL801A-S the Right Part?
At 1/8in thread, this Dia 8 body is the top of the small ladder: step down to the PTL601A-S for Dia 6 tubing feeding lighter grippers and small slides, or step up to Dia 10 tubing, which only exists on the PTL in a 1/4in thread (PTL1002A). Stepping a tube size changes the airflow envelope the bore can carry, so a larger bore supports faster free stroke on the unthrottled side. If you would rather turn a knob quickly during changeovers, look at the knob-type PSL series in the same sizes instead.
Mount the controller directly in the cylinder port rather than back at the valve. Throttling near the actuator keeps the small volume of trapped air low, which is what actually gives you stable, repeatable speed control.
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 PTL801A-S FAQ
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 temperature range is -20 to +70 C. This SKU is the Dia 8 tube size with a 1/8in PT thread in the A meter-out direction. It takes soft nylon or polyurethane tubing, and the SUS304 column does not alter any of these figures versus the standard brass-column PTL801A.
Release the cap by pushing it in, adjust, then press it back down until it seats; AirTAC's published seating torque for a 1/8in push-lock cap is 0.08 N.m, which is hand-firm, not wrench-tight. The -S suffix changes only the materials: the throttling column becomes SUS304 stainless in place of brass. Pressure, temperature and dimension tables are unchanged, and no food or medical certification is published for this part.
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