Airtac M5B Basic Type Mechanical Valve M5B21006G
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5B Basic Type Mechanical Valve M5B21006G is a genuine 5/2-way basic (plunger) type control valve. A plain plunger head. Pushed by a machine part, a jig or a fingertip. 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 | M5B21006G |
|---|---|
| Valve type | 5/2 way, external control, direct acting |
| Actuation | Basic (plunger) type |
| Reset | Automatic (spring) restoration |
| Body series | 200 Series, single control |
| Port size | PT1/8 |
| Effective area | 9.0 mm2 (Cv 0.50) |
| 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 | 2.0-3.3 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 control set is engineering plastic and must be operated by hand only - never switch it by striking it with a tool. The exhaust outlet sits on top of the body, so a silencer fits directly.
About the M5B21006G
The M5B21006G is a 5/2-way external control, direct acting valve that is thrown mechanically by its basic plunger - there is no solenoid coil and no pilot port anywhere on the body. A machine part, jig or fingertip presses the plunger to change the valve over, and a spring returns the spool the moment the force is removed, so this is an automatic-restoration valve by design. Because the spool is a sliding column, the changeover is not affected by working pressure: there is no back-pressure effect, so switching stays consistent across the full 0 to 1.0 MPa range.
This example is the 200 Series single control body (210) with PT1/8 ports and a green plunger button, giving a 9.0 mm2 effective area (Cv 0.50). The exhaust outlet sits on top of the body, so a silencer screws straight on without elbow fittings. The control set here is engineering plastic, which AirTAC rates for manual operation only - driving it by striking with a tool is forbidden - and spare control sets can be ordered separately if a plunger is ever damaged.
Typical applications
Slide press end-of-stroke trip
Position the plunger so the press slide or a fixture bolt contacts it at the bottom of the stroke, shifting the 5/2 valve to retract the clamp cylinder - a purely pneumatic limit point with no wiring at the die.
Packaging line cam trigger
A cam or product carrier on a packaging conveyor depresses the plunger once per cycle, stepping the pneumatic sequence forward; the spring returns it instantly so the next carrier reads a clean reset.
Drill jig clamping step
In a jig circuit with no electricity at the fixture, a loading arm presses the plunger to send the clamp cylinder to the work position; release the pressure on the plunger and the spring drops the valve straight back.
How to choose
If you are weighing this against the M5PP21006G, the difference is the contact face: the PP gives a protruding button that is easy to find and hit with a palm, while this basic type is a bare plunger meant to be pressed directly by a moving machine part or fixture. If the switched state must hold after the hand or part leaves, step sideways to a manual-restoration type such as M5Y or M5HS instead. On sizing, the 210 body with 1/8 in ports flows 9.0 mm2 (Cv 0.50); step to the 08 port code for 12.0 mm2 (Cv 0.67) on a larger cylinder, or down to the 110 body for 8.0 mm2. Mind the reversal stroke: the published spool stroke is 2.0-3.3 mm and AirTAC states explicitly that exceeding it damages the valve, so mount the trip so the plunger cannot be overdriven.
Frequently asked questions
It is a 5/2-way, external control, direct acting mechanical valve on the 200 Series body with PT1/8 ports and a green plunger. Working pressure is 0-1.0 MPa (0-145 psi), proof pressure 1.5 MPa (215 psi) and the temperature range is -20 to +70 C. Effective orifice area is 9.0 mm2 (Cv 0.50). Media is air filtered by a 40 um element; lubrication is not required, but once lubricated air is introduced, stay with ISO VG32 or an equivalent grade.
The published spool stroke is 2.0-3.3 mm. AirTAC states that exceeding the reversal stroke limits damages the valve, so set the trip so the contacting part cannot drive the plunger past that window. Also note the plastic control set on this model is approved for manual operation only - switching it by striking with a tool is forbidden in the datasheet.