Airtac M5R Roller Lever Mechanical Valve M5R21008G
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5R Roller Lever Mechanical Valve M5R21008G 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 | M5R21008G |
|---|---|
| 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) |
| Button colour | Green |
| 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 | G (BSPP parallel) |
| 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 M5R21008G
The AirTAC M5R21008G is a 5/2-way external-control, direct-acting valve that is thrown purely by machinery: a cam, carriage or machine table rides over the roller lever and the spool changes over. There is no solenoid coil, no pilot port and no electrical connection anywhere on the valve, so it sits happily on circuits where power is absent, unwanted or simply not permitted.
This is the 200-series single-control body (210) with a 1/4in PT thread and a green-coded roller actuator, giving an effective area of 12.0 mm2 (Cv 0.67). The sliding-column spool means the changeover force is unaffected by working pressure, so the valve trips identically at low and high pressure. Because the roller returns with the actuator that tripped it, the valve reverts on its own as the cam passes - and with a metal control set, the M5R210 is built for repeated mechanical striking. If the lever ever wears, the complete control set is available as a spare under part number M3R210-P14A. The exhaust sits on top of the body, so a silencer screws straight on and the station stays quiet.
Typical applications
Pallet transfer clamp sequencing
Mount the M5R21008G beside a pallet transfer conveyor so the pallet itself or a trip cam on the chain carriage rolls over the lever at end of stroke, shifting the 5/2 valve to send the clamp cylinder forward.
Press guard door position signal
Fit the valve at the bottom of a sliding press guard: the door's cam trips the roller only when the guard is fully closed, proving position pneumatically and switching the downstream function - no wiring, no proximity switch.
Rotary indexing table trigger
On a pneumatic rotary indexing fixture, a cam pinned to the rotating table sweeps the roller at each station, advancing the fixture clamp sequence once per index in whichever direction the table travels.
How to choose
The choice you are most likely weighing is R against L. Both are rollers tripped by a passing cam, but M5R responds from either direction of travel, while M5L only accepts an impact in one direction by design - pick M5R when the same carriage should signal on both the out-stroke and the return, and M5L only when you want a signal on the return pass alone. On body and port: the 110 body is the smaller single-control option at 8.0 mm2, while this 210 body with a 1/4in port gives 12.0 mm2 (Cv 0.67) - step up to it when a 1/4in-port cylinder or a faster cycle needs the extra flow; the 1/8in 210 version gives 9.0 mm2 if the cylinder is small.
Do not overstroke the lever. The published limits for this valve are a spool stroke of 2.0-3.0 mm and an actuator stroke of 4.6-6.8 mm at the roller. Exceeding the actuator stroke damages the valve - AirTAC states this explicitly - so design the cam so travel past the trip point is limited to that window.
Frequently asked questions
It is a 5/2-way external-control, direct-acting mechanical valve with a roller lever on the 200-series single-control body. Operating pressure is 0-1.0 MPa (0-145 psi), proof pressure 1.5 MPa (215 psi), and media temperature -20 to +70 C with filtered air through a 40 um element. The port is 1/4in PT with a green-coded actuator, the effective area is 12.0 mm2 (Cv 0.67), the body is aluminium alloy, and lubrication is not required - though if lubricated air is used, keep the same medium throughout.
The published reversal limits for the M5R21008G are a spool stroke of 2.0-3.0 mm and an actuator stroke of 4.6-6.8 mm measured at the roller. Exceeding the actuator stroke damages the valve - this is stated explicitly in the AirTAC datasheet. Design your cam so that travel beyond the trip point cannot drive the roller past 6.8 mm, for example by shaping the cam profile or adding a hard stop beside the lever.