Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601B-MS
SUS304 stainless variant (-S)The AirTAC Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601B-MS 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 PTL601B-MS
The PTL601B-MS is the SUS304 stainless version of AirTAC's mini push-lock speed controller, sized for Dia 6 soft nylon or polyurethane tube on a 1/8in PT thread. It throttles air in one direction and lets it pass freely in the other, so it sets the stroke speed of an actuator without robbing the circuit of full flow on the return leg. The B suffix marks meter-in control: air from the thread port to the tube runs free, and the exhaust path back from the tube is throttled. AirTAC positions meter-out as the default for double-acting cylinders, so this B code is the one to pick when the actuator is single-acting and needs its supply side metered to avoid the piston running away under spring or load. Because the throttle sits on the inlet side, there is no exhaust back-pressure cushion, which is exactly what a single-acting spring-return cylinder wants.
Instead of a knurled knob, this mini series uses a push-lock adjusting cap: press it in to release the tube and set the flow, press again to lock. Once seated, the cap resists vibration and casual knocks far better than a free-turning knob, which is why it suits machines that are washed down, transported or serviced by people who did not commission them. In the -MS build the throttling column is SUS304 in place of the brass used on the standard PTL, with the throttling body in aluminium alloy or SUS304 depending on the part. That removes copper from the wetted flow path, the reason plating lines, electronics processes and copper-sensitive food applications specify it.
Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601B-MS Technical Specifications
| Model | Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601B-MS |
|---|---|
| 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) |
| Size class | Mini series (-M) |
| 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 PTL601B-MS
| 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. |
| -M | Mini series. |
| -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 PTL601B-MS Is Used
Spring-return tray clamp on a food filler
A single-acting stainless clamp that closes onto filled trays is fed by the PTL601B-MS in meter-in mode, so the spring return governs the gentle closing speed onto the product face. The SUS304 column keeps copper out of the wetted path near wash-down areas.
Plating-line lift on a single-acting ram
A small copper-free lift ram in an electroplating jig uses the B meter-in trim to slow the downstroke under gravity plus spring. Brass in the flow stream would risk copper contamination of the bath chemistry, which is the reason the stainless column is specified here.
Electronics fixture ejector pin
A single-acting ejector that pushes finished PCBs out of a test fixture is metered on its supply side so boards are not flicked across the conveyor. The Dia 6 mini body fits the tight manifold spacing typical of test-head frames.
Is the Airtac PTL Exhaust Throttle Type Speed Control Valve PTL601B-MS the Right Part?
Start by matching the actuator, not the tube. If the cylinder is double-acting and driven by a solenoid valve, step back to an A (meter-out) code so the exhaust is throttled and the stroke rides on a back-pressure cushion; a B (meter-in) code on a double-acting cylinder under varying load tends to stick-slip. B is right for single-acting cylinders. On size: within the stainless mini ladder, PTL401B-MS (Dia 4 on 1/8in) is the only smaller neighbour, and stepping to Dia 8 on a 1/8in thread leaves the mini series for the standard PTL801B. Going down shrinks the controlled volume and suits short, quick strokes; going up adds capacity for longer runs and larger bores. Note the mini ladder only exists in Dia 4 and Dia 6 with M5 or 1/8in threads, so a Dia 6 buyer with a 1/4in port moves to the full-size PTL. Fit the controller directly at the cylinder port so only the short stub of tube between controller and port is throttled - the response is crisper the smaller that volume is. Tighten the push-lock cap to 0.08 N.m for the 1/8in size; that is the one published torque figure for this part.
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 PTL601B-MS FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, ambient and media temperature -20 to +70 C. This code is Dia 6 tube on a 1/8in PT thread, B meter-in control, push-lock adjusting cap, SUS304 throttling column with the body in aluminium alloy or SUS304. The same ratings apply to the standard PTL601B; the -MS changes materials, not performance figures.
Press the cap in to release the collet, pull the tube out, then insert the new tube until it bottoms and press the cap to lock. Adjust flow only while locked position is released, and torque the cap to 0.08 N.m for this 1/8in size - overtightening adds nothing and can distort the cap. Remember a speed controller is not a shut-off valve: it can seep slightly when fully closed. If you need to isolate the circuit, use a PHV finger valve instead.
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