Airtac PSL Throttle Speed Control Fitting PSL802BD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL802BD 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 PSL802BD
The PSL802BD is an AirTAC PSL speed controller that screws into a 1/4in PT port and pushes Dia 8 soft nylon or polyurethane tubing out of its fixed, non-swivelling outlet. Inside, a brass throttling column restricts flow in one direction only: on this B-suffix code the free path runs from the thread port into the tube, while air travelling back from the tube toward the port is throttled. AirTAC positions meter-in control like this for single-acting cylinders, where spring or return force does the work and fine control of the restricted path sets the stroke speed.
Adjustment is a knob under an aluminium-alloy locking cap, so once the speed is set the cap can be snugged down and vibration on the machine will not drift the setting. The D suffix means the body is black rather than the standard grey, which many builders use to spot meter-in parts at a glance on a crowded manifold. Note that this is a speed controller, not a shut-off valve: like every PSL, it is designed to weep slightly when fully closed, so isolate the circuit elsewhere.
Airtac PSL Throttle Speed Control Fitting PSL802BD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL802BD |
|---|---|
| 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 PSL802BD
| 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 PSL802BD Is Used
Stamping press ejectors
Single-acting kick cylinders that punch finished brackets off a die benefit from controlled return flow; the Dia 8 bore and 1/4in port suit the compact feeds typical of press tooling.
Furniture edge-banding clamps
Spring-return clamp cylinders pressing veneer strips need a speed setting that survives a dusty workshop; the locking cap holds the knob position through daily vibration.
Packaging line pin markers
A single-acting marking pin that must cycle to the rhythm of the conveyor gets its stroke timing from the restricted path, with the black body marking it as the meter-in station on the manifold.
Is the Airtac PSL Throttle Speed Control Fitting PSL802BD the Right Part?
This code sits mid-ladder on the 1/4in thread: the neighbouring tube sizes are Dia 6 (PSL602B) below and Dia 10 (PSL1002B) above. Stepping down tightens the free-flow path for smaller single-acting actuators and shorter lines; stepping up gives a larger bore for bigger cylinders and longer tubing runs. If your thread rather than your tube is the variable, Dia 8 also exists on 1/8in (PSL801B) and 3/8in (PSL803B).
Pick PSL over PSS when the tube must point one fixed way; if you need the outlet to swivel 360 degrees at fitting, choose the PSS family instead. Whatever you choose, mount the controller directly at the cylinder port so the throttled air volume stays small and the speed response stays crisp. AirTAC's own guidance makes meter-out the first priority for double-acting cylinders, so reserve this B code for single-acting service.
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 PSL802BD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU takes Dia 8 soft nylon or polyurethane tubing and has a 1/4in PT thread. The D suffix denotes the black body colour, and the B suffix denotes meter-in control. Applicable tubing types are soft nylon and polyurethane.
AirTAC advises against it. Meter-in control on a double-acting cylinder tends to stick-slip under changing load because there is no back-pressure cushion. AirTAC states that meter-out is the first priority, so for a double-acting cylinder order the A version, PSL802AD, which throttles the exhaust path instead. Keep the PSL802BD for single-acting cylinders.
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