Airtac PSL Throttle Speed Control Fitting PSL1204BD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL1204BD is a genuine speed controller, threaded elbow with knob with aluminium-alloy locking cap and fixed tube direction, used to set the speed of a pneumatic cylinder by throttling its air.
- TypeSpeed controller, threaded elbow
- SeriesPSL
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- AdjustmentKnob with aluminium-alloy locking cap
- 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 PSL Throttle Speed Control Fitting PSL1204BD
The PSL1204BD is a Dia 12 speed controller with a 1/2in PT thread port, finished in black (the D suffix). It screws into the cylinder or valve port and accepts a 12mm soft nylon or polyurethane tube on the outlet side, in one fixed direction - the tube cannot swivel. Inside, a brass throttling column pinches the flow in one direction only, so it sets how fast an actuator runs while letting air pass unthrottled the other way.
This code carries the B suffix: meter-in. Air from the 1/2in thread port into the tube runs free; the flow back out of the tube toward the port is throttled. AirTAC's own guidance is that meter-out (A) is the first priority, because on a double-acting cylinder throttled exhaust builds a back-pressure cushion that keeps the stroke smooth. Meter-in is the right pick when your actuator is single-acting - a spring-return ram, for example - where there is no exhaust side to throttle. Expect stick-slip if you run meter-in on a heavily loaded double-acting cylinder. Adjustment is a knob under an aluminium locking cap: turn to set the speed, then screw the cap down so vibration cannot drift the setting. Two facts worth knowing before you install: this valve is not a shut-off - a fully closed speed controller leaks slightly by design, so use a PHV finger valve where you need true isolation - and the published ratings cover 0-1.0 MPa working, 1.5 MPa proof, -750 mmHg vacuum and -20 to +70 C, with hard nylon tubing explicitly excluded.
Airtac PSL Throttle Speed Control Fitting PSL1204BD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL1204BD |
|---|---|
| Type | Speed controller, threaded elbow |
| Series | PSL |
| Adjustment | Knob with aluminium-alloy locking cap |
| Orientation | Fixed tube direction |
| 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. 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 PSL Throttle Speed Control Fitting PSL1204BD
| PSL | 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. |
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 PSL Throttle Speed Control Fitting PSL1204BD Is Used
Spring-return clamp on a tray-sealing press
A single-acting spring-return clamp has to close gently onto the film and tray before the heated platen drops. Meter-in throttling on the supply side gives a controlled closing speed with no exhaust port to tune, and the locking cap holds that setting through thousands of cycles.
Kick-up reject gate on a bottle filler
A single-acting pneumatic ram kicks underfilled bottles off a filler conveyor. The B suffix limits how fast the ram re-extends, so the gate resets without bouncing bottles into the guide rails, while the return stroke of air runs through unthrottled.
Down-stroke stamp on a rubber moulding cell
A light single-acting stamping ram marking date codes on moulded rubber parts must descend at a repeatable pace or the mark smears. Fitting the PSL1204BD straight into the cylinder's 1/2in port keeps the throttled volume small and the stroke timing tight.
Is the Airtac PSL Throttle Speed Control Fitting PSL1204BD the Right Part?
Meter-in or meter-out first: single-acting cylinder, take the B suffix; double-acting cylinder driven by a solenoid valve, take the A suffix (PSL1204AD) instead. Then pick the body style: PSL is fixed-tube and cheapest per point; PSS adds a 360-degree swivelling outlet where the tube must rotate to reach the actuator; PSA is inline tube-to-tube with no thread at all. Knob versus push-lock: this knob version is faster to set by hand during commissioning, while a PTL push-lock cap resists being knocked out of adjustment on machines operators lean over.
On the size ladder, PSL on a 1/2in port runs Dia 8, Dia 10 and Dia 12, so this is the largest tube in the range - there is nothing above it. The neighbour below is Dia 10 (PSL1004B); stepping down reduces the bore and therefore the capacity of the circuit it can serve, while stepping to a smaller thread size (3/8in, code 03) opens up Dia 6 through Dia 12 with different port hardware. Whichever you choose, mount the controller directly at the cylinder port so the volume of air being throttled stays small and the response stays crisp.
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 PSL Throttle Speed Control Fitting PSL1204BD FAQ
It is a Dia 12 tube speed controller with a 1/2in PT thread port, in black. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, and it tolerates negative pressure down to -750 mmHg (10 Torr). The temperature range is -20 to +70 C. Use soft nylon or polyurethane tubing only - hard nylon is not covered by the rating.
No. A speed controller is a flow regulator, not a shut-off valve - AirTAC designs it to leak slightly when fully closed, so a closed knob will not guarantee zero downstream pressure. For true isolation install a PHV finger valve, which is a manual quarter-turn shut-off, upstream of the controller.
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 PSL Throttle Speed Control Fitting PSL1204BD
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.