Airtac M5R Roller Lever Mechanical Valve M5R21008
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5R Roller Lever Mechanical Valve M5R21008 is a genuine 5/2-way roller type control valve. A roller lever tripped by a passing cam, slide or carriage. Works from either 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 PT1/4 with a 12.0 mm2 (Cv 0.67) effective area.
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Specifications
| Model | M5R21008 |
|---|---|
| Valve type | 5/2 way, external control, direct acting |
| Actuation | Roller type |
| Reset | Automatic (spring) restoration |
| Body series | 200 Series, single control |
| Port size | PT1/4 |
| Effective area | 12.0 mm2 (Cv 0.67) |
| 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 | 4.6-6.8 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 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 M5R21008
The M5R21008 is a 5/2-way external control, direct acting valve that is thrown mechanically by a roller lever - there is no coil, no pilot port and no wiring anywhere on it. A cam, carriage or machine slide rolls onto the roller and the spool changes over; when the cam rolls back off, the actuator and spool return with it. The roller reads traffic from either direction, so one valve can serve both passes of a moving part. This example is the 200 Series single-control 210 body with 1/4 in PT ports and a 12.0 mm2 orifice (Cv 0.67).
Because the spool is a sliding-column construction, the force needed to trip it is not affected by working pressure - there is no back-pressure effect, so changeover stays consistent across the full 0 to 1.0 MPa range. The exhaust outlet sits on top of the body, so a silencer screws straight on without re-plumbing the manifold. AirTAC builds the R control set in metal for longer, more stable service, and a replacement control set can be ordered as a spare (M3R210-P14A). Body and panel mounting are both supported, and once lubricated air has been introduced it should be kept up with the same medium (ISO VG32 or equivalent grade).
Typical applications
Transfer-carriage reversal
On a conveyor transfer station, a cam bolted under the shuttle carriage trips the roller each time it arrives, reversing the stopper cylinder without any electrical limit switch down at the track.
Pallet track two-pass control
A pallet running back and forth on a transfer track rolls over the valve in both directions, so a single M5R covers the outbound trigger and the return trigger with one port fitting.
No-electronics sequence step
In a purely pneumatic drilling fixture, the slide's trip dog rolls the lever at end of stroke to advance the clamp sequence - useful where wiring is unwanted near coolant and swarf.
How to choose
The usual decision is R against L. Both are roller valves, but the L free-return type only accepts an impact travelling right to left, so it exists to switch on the return pass alone, while this R roller works from both directions. If your cam only ever approaches one way and you want a deliberate one-way trip, step to M5L21008 instead. On body and port: the 110 body with 1/8 in ports flows 8.0 mm2, the 210 body with 1/8 in flows 9.0 mm2, and this 210 body with 1/4 in reaches 12.0 mm2 (Cv 0.67) - step up when the valve feeds a cylinder directly rather than signalling another valve. Mind the reversal stroke: the spool travels 2.0-3.0 mm and the roller 4.6-6.8 mm. Exceeding those published limits damages the valve, so set the trip dog to depress the roller fully without slamming past it.
Frequently asked questions
It is a 5/2-way external control, direct acting valve with 1/4 in PT ports. Working pressure is 0-1.0 MPa (0-145 psi), proof pressure is 1.5 MPa (215 psi) and the temperature range is -20 to +70 C. The medium is air filtered by a 40 um element, and the orifice on the 210 body at 1/4 in is 12.0 mm2 with a Cv of 0.67. No lubrication is required, but if you start with lubricated air, continue with the same medium (ISO VG32 or equivalent).
The valve is built around a published reversal stroke, not an open-ended one: the spool stroke is 2.0-3.0 mm and the roller stroke is 4.6-6.8 mm. AirTAC states explicitly that exceeding these limits damages the valve, so position your cam or trip dog so it depresses the roller fully but cannot push beyond that travel, and verify this across the entire stroke of the moving part including any overshoot at speed.