Airtac M5Y Rocker Type Mechanical Valve M5Y21008
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5Y Rocker Type Mechanical Valve M5Y21008 is a genuine 5/2-way lever type control valve. A lever that STAYS where it is set - manual restoration, so it holds the circuit. 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.
$32.08 $36.56Save 12%- No minimum order. A single piece can be ordered.
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Specifications
| Model | M5Y21008 |
|---|---|
| Valve type | 5/2 way, external control, direct acting |
| Actuation | Lever type |
| Reset | Manual restoration - it holds its position |
| 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 |
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 lever 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 M5Y21008
The M5Y21008 is a 5/2-way external control, direct acting valve that is thrown by hand, not by electricity. There is no coil, no solenoid and no pilot port - a human hand on the lever is the only actuation. The Y lever is a manual-restoration type: flip it and the valve stays in that position until you deliberately flip it back, so a clamped part stays clamped or a circuit stays vented while your hands are elsewhere. Nothing in the circuit can move the lever but the operator, which is exactly why this variant exists.
This example is the 200 Series single-control body with a PT1/4 port and an effective area of 12.0 mm2 (Cv 0.67), the largest flow in the common-type M5 range. The sliding-column spool means the changeover force is not affected by working pressure - there is no back-pressure effect, so the lever feels and switches the same at low pressure as at full 1.0 MPa. The Y control set is metal for longer, more stable service, and the exhaust outlet sits on top of the body so a silencer screws straight on.
Typical applications
Jig clamping on a milling fixture
Mounted to the fixture body, the lever is flipped to clamp and stays there through the whole machining cycle. The operator can drop the part in, start the cut and walk to the next station without holding anything.
Pneumatic test bench for cylinder repair
A bench operator flips the lever to stroke a rebuilt cylinder, watches for leaks, then flips it back to retract. The held position leaves both hands free for the fittings and the pressure gauge.
Two-state diversion on a packing line
A hand lever on the conveyor diverts product between a main line and a reject lane. Because the lever holds, the line keeps running on the selected path until the shift leader deliberately switches it.
How to choose
Choose Y when the position must HOLD; choose D or C when it must spring back. Within the holding group, the real comparison is Y versus HS: both are manual restoration, but a lever flips in a split second between positions while the HS selector has to be deliberately turned, so Y suits frequent changeovers and HS suits set-once configuration switches. If you only need to latch a momentary action, PL latches on push and twists to release instead. On body and port, the 210 body at PT1/4 gives 12.0 mm2 (Cv 0.67) against 9.0 mm2 (Cv 0.50) at PT1/8 - step up to 1/4 when the downstream cylinder is 63 mm bore or larger, or when you want the exhaust restricted as little as possible. One caution the datasheet states explicitly: the valve has a published reversal-stroke window for the spool and the lever, and operating beyond it damages the valve - fit a stop or overtravel bumper so the lever cannot be swung past its travel.
Frequently asked questions
It is a 5/2-way external control, direct acting valve with a hand lever (manual restoration - the valve stays where set). Port is PT1/4. Effective area is 12.0 mm2 (Cv 0.67). Working pressure is 0-1.0 MPa (0-145 psi), proof pressure 1.5 MPa (215 psi), and fluid temperature -20 to +70 C on filtered air (40 um filter element). Body is aluminium alloy; lubrication is not required, but if lubricated air is used, keep using it - AirTAC suggests ISO VG32 or equivalent.
The 210 body supports both direct body mounting and panel mounting - pick whichever puts the lever at a natural hand height. Screw the 1/4in PT connections in with sealant, not over-tightened into the aluminium. The exhaust outlet is on top of the body, so fit a silencer there to keep the station quiet. Position a mechanical stop so the lever can never be swung past its published reversal stroke; exceeding the stroke range damages the valve, and AirTAC states this explicitly. Metal control sets can be ordered separately as spares if the valve ever needs rebuilding.