Airtac M5L One-way Roller Lever Type Mechanical Valve M5L21006
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5L One-way Roller Lever Type Mechanical Valve M5L21006 is a genuine 5/2-way roller, free-return type control valve. A one-way roller. It switches on the return pass only and idles in the other direction. It is an external control, direct-acting valve - the spool is moved mechanically, so there is nothing to wire and no pilot line to plumb. Ports are PT1/8 with a 9.0 mm2 (Cv 0.50) effective area.
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Specifications
| Model | M5L21006 |
|---|---|
| Valve type | 5/2 way, external control, direct acting |
| Actuation | Roller, free-return type |
| Reset | Automatic (spring) restoration |
| Body series | 200 Series, single control |
| Port size | PT1/8 |
| Effective area | 9.0 mm2 (Cv 0.50) |
| Fluid | Air, filtered by a 40 um element |
|---|---|
| Pressure range | 0 - 1.0 MPa (0 - 145 psi) |
| Proof pressure | 1.5 MPa (215 psi) |
| Temperature | -20 to +70 C |
| Body material | Aluminium alloy |
| Lubrication | Not required |
| Thread standard | PT (Rc tapered) |
| Spool stroke | 2.0-3.0 mm |
| Actuator stroke | 5.0-7.8 mm at the roller |
Sliding-column (spool) construction, so operating force is not affected by working pressure - there is no back-pressure effect. Lubrication is not required, but once the valve has been run on lubricated air it must stay on lubricated air; AirTAC suggests ISO VG32 or equivalent. The roller, free-return type control set is METAL, which gives a longer service life than the engineering-plastic heads. The exhaust outlet sits on top of the body, so a silencer fits directly.
About the M5L21006
The M5L21006 is a 5/2-way external control, direct acting valve with no coil and no pilot port - the spool is thrown entirely by mechanics. Its free-return roller trips in ONE direction only: when a cam or carriage strikes it from the right travelling left, the valve switches; the reverse pass passes over the roller and does nothing. That one-way behaviour is a design feature, not a defect, which makes it the M5 actuator to specify when only the return stroke of a cycle must send a signal. The 210 body carries a PT1/8 port with a 9.0 mm2 effective orifice (Cv 0.50).
Internally it is a sliding-column spool valve, so the force needed to change over does not rise with working pressure - switching stays consistent from near-zero right up to 1.0 MPa because there is no back-pressure effect working against the roller. The L actuator runs a metal control set for long, stable service, and the exhaust port sits on top of the body so a silencer screws straight on without elbow fittings. AirTAC supplies this valve with a 40 um filtered air supply across a -20 to +70 C window, and body or panel mounting both work.
Typical applications
Return-pass signal on a pneumatic press
Fit the M5L21006 beside the slide of a small stamping or riveting press so the retracting carriage trips the roller on the way back. The downward working stroke sweeps past without switching, so the return signal fires exactly once per cycle and cannot false-trigger during forming.
One-way carton detection on a packaging line
Mount the valve along a carton sealing conveyor where boxes travel a fixed route. Because the roller responds to a right-to-left impact only, products pushed back by a jam or an operator do not switch the valve - only correctly travelling cartons advance the sequence.
Retract-only indexing on a slide feed unit
Use the one-way roller at the home end of a vibratory bowl or slide feeder to confirm retraction at the end of each feed cycle. The forward feed stroke leaves the valve untouched, so the piston-return confirmation pulse is sent once, on the way home, every single shot.
How to choose
Choose between L and R on one question: do you want the valve to fire on both passes or only one? M5R switches whichever way the cam travels, so it suits simple end-of-stroke sensing; M5L ignores the outward pass completely, which is exactly what you need when the forward stroke performs work and only the retract must signal. For the body, the 210 at 1/8 gives 9.0 mm2; step to M5L21008 for 12.0 mm2 (Cv 0.67) if you are shifting a mid-size cylinder faster, or down to the mini M5L05 at 2.5 mm2 where panel space is tight.
Watch the reversal stroke: the spool needs 2.0-3.0 mm of travel and the roller itself 5.0-7.8 mm. Design your cam so it works the roller within that window - driving the actuator past the published limit damages the valve, and AirTAC states this explicitly in the datasheet.
Frequently asked questions
It is a 5/2-way external control, direct acting valve with a one-way free-return roller actuator and a PT1/8 port. Working pressure is 0-1.0 MPa (0-145 psi) with a proof pressure of 1.5 MPa (215 psi), operating temperature -20 to +70 C, and it needs air filtered to 40 um. The aluminium alloy body carries a 9.0 mm2 effective orifice (Cv 0.50). No lubrication is required, though if lubricated air is used, keep using the same medium - AirTAC suggests ISO VG32 or equivalent.
Stay inside the published reversal stroke. The spool must move 2.0-3.0 mm and the roller actuator 5.0-7.8 mm in total; driving it beyond these limits damages the valve, and AirTAC warns against overtravel explicitly. Set your cam so full switching happens comfortably within the range, and remember the roller only responds to a right-to-left impact - the opposite direction is deliberately inoperative, so check your machine's travel direction before mounting.