Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD-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 PTL804BD-S
The PTL804BD-S is a push-lock speed controller in the SUS304 stainless variant: it meters air in one direction and passes it freely in the other, so you set the speed of a cylinder or rotary actuator from the same fitting that connects the tubing. This code carries the B suffix, so it is a meter-in type: flow from the 1/2in thread port into the Dia 8 tube runs unrestricted, and the return path is throttled. That is the correct choice for a single-acting, spring-return actuator, where air is doing work in one direction only. AirTAC's own application note is worth repeating here: meter-out remains the first priority for double-acting cylinders, because meter-in on a loaded double-acting stroke tends to stick-slip as the load changes.
The push-lock cap is the adjustment mechanism: press it in to grip the Dia 8 tube, lift it to release, and it also locks the needle setting so vibration on the machine frame cannot walk it out of adjustment. AirTAC publishes one torque figure for this cap, and for a 1/2in thread size it is 0.32 N.m - snug, not forced. Unlike the swivelling PTS family, the PTL body has a fixed tube direction, so plan the piping so the tube leaves the side you need. The -S variant uses a SUS304 stainless throttling column in place of brass (the body may be aluminium alloy or SUS304 depending on the part), and the D suffix gives the grey standard body in black.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD-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 PTL804BD-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 PTL804BD-S Is Used
Spring-return clamp on a trim press
A single-acting clamp on an aluminium die-cast trimming press must close gently onto freshly machined faces. Meter-in control at the port slows the extend stroke while the spring returns it fast, and the push-lock cap holds the setting against press vibration.
Dot-peen marker stroke timing
A single-acting dot-peen marker stamping lot codes onto steel brackets needs a repeatable, unhurried down-stroke. The B meter-in code throttles the working stroke only, so the marker retracts at full spring speed between parts.
Brass-free rinse station actuator
On an electroplating rinse line, copper-alloy parts in the wet zone can contaminate the bath chemistry. The SUS304 throttling column of this -S variant removes the brass from the flow path, with the black body identified at a glance among grey standard fittings.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL804BD-S the Right Part?
Start with the control direction, not the size. If your actuator is single-acting or spring-return, meter-in (this B code) is right. If it is double-acting on a solenoid valve, step to the A meter-out version, PTL804AD-S, so the exhaust is throttled and the cushion back-pressure keeps the stroke smooth. Then check the body style: fixed-tube PTL, 360-degree swivel PTS, or inline PSA/PTA with no thread port at all.
On size, Dia 8 is the smallest tube AirTAC offers on a 1/2in PTL - there is no Dia 6 on this thread. Your real neighbours are PTL803BD-S, which keeps the Dia 8 tube but drops to a 3/8in port if your manifold or valve is smaller, and PTL104BD-S, the Dia 10 / 1/2in step up when you need more bore for a longer or faster stroke. Whichever you choose, mount the controller directly at the cylinder port: the throttled air volume stays tiny and the speed response is immediate, whereas a controller piped back at the valve throttles a long tube of air and feels laggy.
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 PTL804BD-S FAQ
Working pressure is 0-1.0 MPa (0-10 kgf/cm2) with vacuum capability to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and a fluid and ambient temperature range of -20 to +70 C. The fitting takes Dia 8 soft nylon or polyurethane tubing on a 1/2in PT thread. The published cap torque for this 1/2in push-lock size is 0.32 N.m. It is a B meter-in speed controller, and the -S variant specifies a SUS304 stainless throttling column; ratings are identical to the standard brass-column PTL804BD.
Yes. AirTAC does not change the shape, the tube and thread ladders, or any pressure, vacuum or temperature rating for the -S variant - the dimension tables match. What changes is the material in the throttling path: the brass column is replaced with SUS304 stainless, which is why it is chosen for wash-down areas, marine air, plating and electronics work where brass corrosion or copper contamination is a concern. AirTAC publishes no corrosion class or surface-finish figure for it, so if your process needs a certified grade, raise it as an enquiry rather than assuming one.
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