Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B-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 PTL804B-S
The PTL804B-S is AirTAC's stainless push-lock speed controller in the Dia 8 tube by 1/2in PT size. It sets actuator speed by throttling air in one direction while letting it pass freely in the other, and the B suffix makes this the meter-in version: flow from the thread port out to the tube runs free, and the reverse, returning flow is throttled. AirTAC's own catalogue guidance puts meter-out first for double-acting cylinders, where exhaust throttling builds a back-pressure cushion; meter-in like this is the correct pick for single-acting, spring-return actuators, where throttling the supply is what tames the stroke.
Adjustment is via the push-lock cap that gives the PTL family its name: pull the cap up to turn the throttling setting, press it down to lock it so vibration and incidental contact cannot drift the speed. The -S variant replaces the brass throttling column with SUS304 and carries a stainless spring gasket, so the wetted metal train is suited to wash-down, food and marine duty and is copper-free where brass contact would contaminate a process. Ratings are identical to the standard part, and no flow figure is published - capacity follows the Dia 8 bore qualitatively.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B-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 PTL804B-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 PTL804B-S Is Used
Dairy rinse-down clamp
A spring-return clamp on a rotary milk-bottling filler that is hosed down with caustic every shift. The SUS304 column and push-lock setting survive the wash, and meter-in control closes the clamp gently onto the cap.
Bakery tray ejector
A single-acting ejector that nudges trays onto a cross-transfer conveyor. The 1/2in PT port drops straight off a manifold block, and the Dia 8 bore matches the short 8mm hose run to the cylinder.
Plating-line lift
A copper-free requirement above an electroplating bath rules out brass internals. The SUS304 throttling column on this stainless part keeps the air train clean while meter-in control lowers the lift head at a set rate.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804B-S the Right Part?
Match the control method to the actuator before anything else. This B (meter-in) code belongs on single-acting cylinders; if you are driving a double-acting cylinder and want the default, smooth meter-out behaviour, order the A version of the same size instead. On body style, PTL keeps the fixed tube direction of the PSL shape; if you need the tube to swivel 360 degrees on a moving member, step across to the PTS push-lock universal instead.
Sizing both ways: on the 1/2in PT ladder PTL offers Dia 8, 10 and 12, so this Dia 8 code is the small end - step up to PTL1004 or PTL1204 for a larger bore feeding a bigger actuator, or drop to PTL803 to keep the same Dia 8 tube on a 3/8in port. Fit the controller directly at the cylinder port so the small trapped volume between throttle and cylinder gives the sharpest speed response.
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 PTL804B-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, usable vacuum -750 mmHg (10 Torr), operating temperature -20 to +70 C. This SKU is Dia 8 one-touch tube on a 1/2in PT thread, B = meter-in control, with a SUS304 stainless throttling column replacing the standard brass part. Every pressure, vacuum and temperature figure matches the standard PTL804B; the -S changes materials, not ratings.
AirTAC publishes cap torque for the push-lock range: at the 1/2in size, tighten the push-lock cap to 0.32 N.m. To adjust speed, pull the cap up so the needle can be turned, then press it back down; the lock prevents the setting from creeping under vibration. Note this cap torque is the only torque figure published for the family - there is no published needle-turn count or flow value.
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