Airtac PSL Throttle Speed Control Fitting PSL601BD
The AirTAC Airtac PSL Throttle Speed Control Fitting PSL601BD 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 PSL601BD
The PSL601BD is a meter-in speed controller in AirTAC's PSL family: air flows from the 1/8in PT thread port into the Dia 6 mm tube through an adjustable throttle, while the return direction passes through a check valve unobstructed. AirTAC marks the handle B. Meter-in control throttles the supply side, which is the right match for single-acting cylinders - a spring-return clamp, for example - where the spring, not back-pressure, does the retracting. On double-acting cylinders AirTAC recommends meter-out instead, because supply-side throttling can cause stick-slip as the load changes.
This black (D suffix) version carries the standard PSL construction: a brass body and throttling column inside a PBT holder, an NBR O-ring seal and a POM interface, topped with an aluminium-alloy knob and locking cap. Tighten the locking cap after setting and the stroke speed stays put under machine vibration. Push Dia 6 mm soft nylon or polyurethane tubing straight into the one-touch port; the grey standard body is offered, but black suits panels and enclosures where a fitting should not draw the eye.
Airtac PSL Throttle Speed Control Fitting PSL601BD Technical Specifications
| Model | Airtac PSL Throttle Speed Control Fitting PSL601BD |
|---|---|
| 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 PSL601BD
| 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 PSL601BD Is Used
Carton sealing head
A single-acting spring-return clamping slide on a carton taper presses the flap down; meter-in supply throttling eases the descent so the flap is compressed, not creased, and the spring gives a fast, unthrottled retract.
Trim press ejector
A Dia 6 mm single-acting ejector knocks small aluminium offcuts out of a trim die. The B handle meters the punch stroke so parts clear the die without bouncing, while the return path stays free for the next cycle.
Bottling lab sample lift
A bench-top spring-return sample lift raises bottles to a filling nozzle at a set pace. The locking knob holds the set speed through repeated shift changes, and the black body blends into the bench's dark instrument panelling.
Is the Airtac PSL Throttle Speed Control Fitting PSL601BD the Right Part?
Pick the PSL601BD when your actuator is single-acting and meter-in control is required, your port is 1/8in PT and your tubing is Dia 6 mm. Stepping down to the Dia 4 tube version (PSL401B, same 1/8in thread) suits tiny spring-return grippers and short lines; stepping up to Dia 8 (PSL801B) moves more air for longer strokes and faster cycles. If the manifold port is 1/4in rather than 1/8in, the same tube is served by PSL602B. All PSL bodies have a fixed tube direction, so plan the orientation before threading it in.
Install the controller directly at the cylinder port. Meter-in throttling only stays predictable when the volume upstream of the throttle is small and the line between throttle and actuator is short - the further the controller sits from the cylinder, the softer the speed control feels.
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 PSL601BD FAQ
It is a PSL meter-in (B) speed controller for Dia 6 mm tube with a 1/8in PT thread, finished in black (D suffix). Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it tolerates negative pressure to -750 mmHg (10 Torr), proof pressure is 1.5 MPa and the working temperature range is -20 to +70 C. Use soft nylon or polyurethane tubing.
The port is a PT taper thread, so wrap it with PTFE sealant tape and thread it in by hand before a modest wrench turn - over-tightening can crack the PBT holder or distort the brass body. Keep sealant clear of the tube end and the one-touch chuck so no fragments reach the Dia 6 mm seal. Remember this unit meters flow; it is not a shut-off valve, so isolate the circuit upstream before loosening.
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