Airtac PSL Throttle Speed Control Fitting PSL801BD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL801BD 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 PSL801BD
The PSL801BD is an AirTAC PSL speed controller that threads into a 1/4in PT port and accepts Dia 8mm one-touch tubing. It throttles air in one direction to set an actuator's stroke speed and lets air pass freely the other way. The B suffix marks this as the meter-in version: flow from the thread port out to the tube runs unrestricted, while the return path is throttled, and the handle carries a stamped B so technicians can identify it at a glance. The D suffix is the colour code for a black body instead of the standard grey.
Meter-in control is AirTAC's recommended match for single-acting cylinders, where air is supplied on one side only and a spring or gravity returns the ram. Feeding the working stroke through a restriction here gives a predictable, dialled-in extend speed without the stick-slip that meter-in control causes on double-acting actuators. Adjustment is a brass throttling column turned by a knob with an aluminium locking cap, so the setting survives vibration and accidental knocks once tightened.
Airtac PSL Throttle Speed Control Fitting PSL801BD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL801BD |
|---|---|
| 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 PSL801BD
| 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 PSL801BD Is Used
Spring-return clamp on a press jig
A single-acting clamp closing onto machined aluminium housings is fed through the PSL801BD's meter-in restriction, letting the operator dial a gentle closing speed that will not mark the finished face.
Gravity-drop ejector on a packaging line
Cartons are pushed off a conveyor by a ram that lowers under its own weight; meter-in control on the supply side times the descent so each box lands square on the out-feed belt.
Lift-assist ram on an assembly fixture
A single-acting ram raising a light welding fixture is slowed on the power stroke, so the operator can position weldments without the fixture snapping up to height.
Is the Airtac PSL Throttle Speed Control Fitting PSL801BD the Right Part?
Choose this B-type code when the actuator is single-acting: a spring-return clamp, a ram lifted by gravity, or a small air cylinder venting to atmosphere on retract. If you are driving a double-acting cylinder from a solenoid valve, take the A meter-out version of the same size instead - throttling the exhaust side creates a back-pressure cushion that keeps the stroke smooth under varying load.
The PSL body is fixed: the thread points one way and the tube the other, so plan the orientation before ordering. If you need the tube to swivel, the PSS universal range is the swivelling equivalent. On the 1/4in PSL ladder this Dia 8 size sits between Dia 6 (PSL602B) and Dia 10 (PSL1002B) - stepping down gives a leaner, slower feed for small rams, stepping up moves more air for heavier actuation. Mount the controller directly at the cylinder port so only a short stub of tube is throttled, which sharpens 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 PSL Throttle Speed Control Fitting PSL801BD FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), vacuum rating -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. This SKU is the Dia 8mm tube size with a 1/4in PT thread, black (D suffix) body, meter-in (B) control. Applicable tubing is soft nylon or polyurethane.
No. A speed controller is not an isolation valve - even fully closed, it is designed to leak slightly. If you need to vent or isolate a circuit for maintenance, use AirTAC's PHV finger valve, which is a true quarter-turn shut-off. The PSL801BD's job is only to meter flow in the controlled direction while passing air freely in the other.
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