Airtac M5PF Flat Head Push Button Mechanical Valve M5PF21008RG
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5PF Flat Head Push Button Mechanical Valve M5PF21008RG 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 | M5PF21008RG |
|---|---|
| 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 | Red |
| 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 |
| 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 M5PF21008RG
The M5PF21008RG is a 5/2 way, externally controlled, direct acting valve that is thrown purely by hand. There is no coil, no pilot port and no electrical specification anywhere on it - you press the button, the spool moves. The actuator is a flat button: because its face sits flush with the bezel, a sleeve, hip or dropped carton brushing past is far less likely to fire a cycle than with a raised button, which is exactly why AirTAC offers this variant.
This example uses the 200 Series single-control body (210) with a G1/4 thread and a red button, and it resets automatically - release the button and the spring returns the spool every time. Flow passes through a 12.0 mm2 orifice (Cv 0.67). The sliding-column spool means the force needed to change over is not affected by working pressure, so the button feels the same at 0.2 MPa as it does at 1.0 MPa, and the exhaust outlet sits on top of the body so a silencer screws straight in.
Typical applications
Cycle start on a bench press fixture
An operator in a busy cell leans over the fixture to load parts. The flush face of the flat button means a leaning torso or a swinging cable cannot start the press stroke by accident - a deliberate press is required.
Manual override on a bottling conveyor
Mounted at the end of a filling line, the valve lets a technician jog the reject-gate cylinder by hand during changeover. Spring return means the gate always falls back to its safe position the moment the button is released.
Venting a pneumatic jig before tool change
Panel-mounted beside a clamping fixture, the valve vents the clamp circuit when pressed so a fitter can swap tooling. The flush button sits below surrounding bezel level, so reaching across the jig with a spanner cannot dump the clamps.
How to choose
Your real choice inside the button family is how easy the valve should be to hit. The flat button (PF) resists accidental operation, the protruding button (PP) presents a bigger target for a deliberate press, and the mushroom head (PM) is for a full-palm strike without looking. If the valve must hold its position after the press - isolating a circuit, for instance - step across to the latching PL instead, which is a manual-reset valve. All three share this same 210 body.
On body and port: the 110 body at 1/8" flows 8.0 mm2 (Cv 0.45), while this 210 body at 1/4" gives 12.0 mm2 (Cv 0.67), so size the port to the cylinder being switched. Mind the published reversal strokes: spool travel 2.0-3.3 mm, button stroke 3.8-5.1 mm. Driving the button past that range damages the valve - AirTAC states this explicitly. Note also that PF uses an engineering plastic control set rated for manual operation only; switching it by striking with a tool is forbidden by the datasheet.
Frequently asked questions
It is a 5/2 way, externally controlled, direct acting mechanical valve. Media is air filtered to 40 um. Operating pressure range is 0-1.0 MPa (0-145 psi) with a proof pressure of 1.5 MPa (215 psi), and the working temperature range is -20 to +70 C. The port is G1/4 on the 200 Series single-control body with a red button, the orifice is 12.0 mm2 with an effective area equivalent of Cv 0.67, and the valve resets automatically by spring. Body material is aluminium alloy and lubrication is not required, though if lubricated air is used, keep using the same medium - ISO VG32 or equivalent.
The published reversal strokes are a spool travel of 2.0-3.3 mm and a button stroke of 3.8-5.1 mm. These are limits, not targets: driving the button beyond that range damages the valve, and AirTAC says so explicitly on the datasheet. Two related installation points: the control set on the PF is engineering plastic and is rated for manual operation only, so never switch the valve by striking it with a tool; and mounting is flexible - you can screw the body down directly or panel-mount it. Replacement control sets are available as spares if the head ever needs servicing.