Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD-S
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD-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 PTL603BD-S
The PTL603BD-S is a push-lock speed controller for Dia 10 mm soft nylon or polyurethane tubing, screwing into a 3/8 in PT port. The B code makes this a meter-in controller: air travelling from the thread port into the tube runs free, and the return path from tube to thread is the one that gets throttled. That is the correct pairing for single-acting cylinders, where you set the stroke speed by restricting supply or exhaust on one line only.
Adjustment is a push-lock cap: press it to release, turn to the setting you want, press again and it holds. Because the cap locks by detent rather than friction alone, machine vibration is far less likely to drift your setting than with a plain knob. The -S build swaps the brass throttling column for SUS304 stainless steel and adds a stainless spring gasket inside the body, so the wetted flow path resists wash-down and corrosive atmospheres. The D suffix means the exposed body is finished in black. Ratings are unchanged from the standard part: 0-1.0 MPa working, -20 to +70 C.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD-S Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD-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 PTL603BD-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 PTL603BD-S Is Used
CNC hold-down clamps
Single-acting spring-return hold-down clamps on a woodworking machining centre retract slowly and evenly with meter-in control, so the springs, not a slam, set the release speed over thousands of cycles.
Tray line pushers
A spring-return pusher that nudges bakery trays onto a transfer conveyor can be timed by restricting its return, keeping the push stroke consistent without touching the valve timing.
Test rig dosing cylinder
In a bench-top filling or dosing fixture driven by a single-acting cylinder, the push-lock cap holds the calibrated stroke speed even when an operator bumps the body during changeovers.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD-S the Right Part?
Choose meter-in only when your actuator is single-acting (spring or springless). On a double-acting cylinder, meter-in leaves no exhaust back-pressure cushion, so the piston tends to stick-slip as the load changes - fit an A-coded meter-out controller there instead. Between the knob-type PSS and this push-lock PTL: same universal concept is not available in push-lock, so PTL is the fixed-direction body; the push-lock cap trades quick re-setting for a setting that resists being knocked out by hands and hoses.
At 3/8 in thread the PTL tube ladder runs Dia 6, 8, 10 and 12 mm. Step down to the Dia 8 bore (PTL803BD-S) when the cylinder port or line volume is small; step up to Dia 12 (PTL1203BD-S) when a larger bore keeps restrictor-induced lag down on long lines. Mount the controller directly at the cylinder port so only the short stub of tubing between valve and actuator is being throttled - fitting it back at the valve slows the whole line volume and makes the stroke sluggish and uneven.
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 PTL603BD-S FAQ
This is the SUS304 stainless, black (D) PTL push-lock speed controller for Dia 10 mm soft nylon or polyurethane tubing with a 3/8 in PT thread. Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. Control method is B, meter-in. The stainless column and spring gasket do not change any of these ratings versus the standard part.
AirTAC publishes a push-lock cap torque for PTL parts, and at the 3/8 in size it is 0.24 N.m. Seat the tubing by hand, set the speed, then torque the cap to that figure. The adjusting cap is POM plastic, so it needs no wrench and over-tightening risks damaging the threads rather than improving the lock.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Speed Controllers
Request a Quote for Airtac PTL Exhaust Throttle Type Speed Control Valve PTL603BD-S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.