Airtac M5PF Flat Head Push Button Mechanical Valve M5PF21008B
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5PF Flat Head Push Button Mechanical Valve M5PF21008B is a genuine 5/2-way flat button type control valve. A flush button, hard to operate by accident. 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 | M5PF21008B |
|---|---|
| Valve type | 5/2 way, external control, direct acting |
| Actuation | Flat button 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 | Black |
| 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 | 2.0-3.3 mm |
| Actuator stroke | 3.8-5.1 mm at the button |
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 M5PF21008B
The M5PF21008B is a 5/2-way external control, direct acting valve that is thrown by hand - there is no coil, no wiring and no pilot port. The flush black button sits level with its bezel, so the valve changes over only when someone deliberately presses it; a stray elbow or falling part glances off without actuating it. Release the button and an internal spring snaps the spool straight back, so the valve is automatic return, single control.
It is built on the 200-series single control body with a PT1/4 port and a 12.0 mm2 effective orifice (Cv 0.67), the largest flow in the common M5 range and well matched to cylinders up to around 63 mm bore for medium-speed cycles. Because the spool is a sliding column, the force needed to change over is not affected by working pressure - there is no back-pressure effect, so the button feels the same at 0.2 MPa as it does at 1.0 MPa. The exhaust port sits on top of the body, so a silencer screws straight on without elbow fittings, and the 210 body supports both surface and panel mounting.
Typical applications
Fixture clamp on a drilling jig
The flush button on a bench drilling jig is pressed to fire the clamp cylinder, then released as both hands move to the drill handle. The spring return vents the clamp the moment the button comes up, so the fixture can never stay pressurised between cycles.
Momentary start on a packaging table
On a semi-automatic taping and labelling bench, the operator holds the flush black button to run the pusher cylinder and releases it to retract. Because the button sits level, brushing past it with a carton never starts a stroke by accident.
Pneumatic circuit testing on a training panel
Mounted on the panel of a pneumatics trainer or a lab test rig, the 5/2 valve toggles a cylinder forward and back with a push, letting students see the spool logic work with no electrical supply anywhere in the circuit.
How to choose
If you are torn between this and the M5PP21008 protruding button, the difference is mis-hit behaviour: the raised PP button is easier to find and strike quickly, while this flush PF button resists accidental operation from passing hands, falling tools or a jig being loaded beside it. If the machine state must persist after the operator walks away, step sideways to the M5PL latching version instead - that one holds until twisted, where this springs back the instant the button is released.
On sizing, this 210 body with 1/4-inch ports gives 12.0 mm2 (Cv 0.67); the 1/8-inch ported M5PF21006 gives 9.0 mm2 (Cv 0.50) if your cylinder is smaller and you want tighter plumbing. Mind the published reversal limits: spool stroke 2.0-3.3 mm, total button travel 3.8-5.1 mm. Exceeding the button stroke - hitting it with a hammer or clamping it down - damages the valve, and AirTAC says so explicitly. The plastic control set means manual operation only.
Frequently asked questions
It is a 5/2-way external control, direct acting mechanical valve with a flush black flat button and automatic spring return, on a 200-series body with PT1/4 ports. Working pressure is 0-1.0 MPa (0-145 psi), proof pressure 1.5 MPa (215 psi), media temperature -20 to +70 C, and the effective orifice is 12.0 mm2 (Cv 0.67). The body is aluminium alloy, the air must be filtered to 40 um, and no lubrication is required - though if lubricated air is used, keep using the same medium (AirTAC suggests ISO VG32) for best valve life.
The spool itself only needs to move 2.0-3.3 mm to change over fully; the published button travel is 3.8-5.1 mm. Press to the end of that travel and stop - driving the button past it with a hammer, a press or a clamped striker will damage the internal control set, and AirTAC warns against this explicitly. The plastic control set fitted to the PF version is intended for manual palm or finger operation only, never for striking with a tool. Note the valve needs no minimum pressure to switch, since the sliding-column spool is unaffected by working pressure.