Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803AD-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803AD-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 PTL803AD-S
The PTL803AD-S throttles air leaving your valve so an actuator slows down in a controlled way, while air entering the thread port runs through unrestricted. The A suffix makes this the meter-out version, which AirTAC lists as the first-priority control method: on a double-acting cylinder driven by a solenoid valve, throttling the exhaust builds a back-pressure cushion that keeps the stroke smooth instead of letting the load run away. It connects Dia 8 soft nylon or polyurethane tube to a 3/8in PT port, and the D suffix gives the black rather than grey finish.
This is the stainless build: the throttling column is SUS304 instead of the brass used on the standard PTL, and the throttling body is aluminium alloy or SUS304 with a stainless spring gasket. Adjustment is by push-lock cap rather than a knob - you press to release, set the orifice, and the cap holds its position against vibration and knocks. AirTAC publishes one torque figure for this family: tighten the push-lock cap to 0.24 N.m at the 3/8in size. Pressure ratings are identical to the standard line, 0-1.0 MPa working and -750 mmHg vacuum.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803AD-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803AD-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 PTL803AD-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 PTL803AD-S Is Used
Food wash-down diverter gates
On poultry and dairy conveying lines hosed down daily, the SUS304 throttling column and stainless spring gasket resist the corrosion that pits brass columns, while the push-lock cap keeps stroke timing locked between shifts.
Plating-line transfer arm
Electroplating jigs lifting racks between tanks see acid mist at the fixtures; a stainless column in the Dia 8 exhaust circuit lets the operator set a gentle lowering speed without the fitting degrading.
Marine hatch hold-down clamp
A 3/8in PT meter-out controller on a deck-hatch clamp cylinder gives the closing cushion needed so the rubber seal compresses evenly, and the black POM cap sheds salt-spray corrosion better than the grey standard finish.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL803AD-S the Right Part?
Meter-out (A) is the default choice when a solenoid valve drives a double-acting cylinder; exhaust throttling cushions the load and avoids stick-slip under changing force. If your actuator is single-acting, use the B meter-in code instead. A push-lock cap suits machines where settings must survive wash-down hoses and vibration, whereas a knobbled PSL is faster to re-set by hand during commissioning. At the 3/8in thread the tube ladder runs Dia 6, 8, 10 and 12: step down to PTL603A-S for lighter lines and faster response, up to PTL1003A-S for larger actuators. If you keep Dia 8 tube, the adjacent threads are PTL802A-S at 1/4in and PTL804A-S at 1/2in. Mount the controller directly at the cylinder port so the small trapped volume between throttle and actuator gives the crispest 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 PTL803AD-S FAQ
It is a push-lock, meter-out (A) speed controller for Dia 8 soft nylon or polyurethane tube on a 3/8in PT thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure -750 mmHg (10 Torr), and the operating temperature range is -20 to +70 C. The stainless build uses a SUS304 throttling column, and AirTAC specifies a push-lock cap tightening torque of 0.24 N.m at this thread size.
Yes - AirTAC rates the whole PTL family for soft nylon and polyurethane tubing alike, so you can pick the hose that suits the machine. To lock the setting, press the cap in, turn it to the desired speed, release, and then torque the cap to 0.24 N.m; the push-lock design then resists being knocked out of adjustment by vibration or wash-down spray. Note the PT taper thread seals on the thread itself, so use appropriate sealant on the male port.
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