Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008GG
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008GG is a genuine 5/2-way mushroom head type control valve. A large mushroom head that can be hit with a palm without looking for it. 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 | M5PM21008GG |
|---|---|
| Valve type | 5/2 way, external control, direct acting |
| Actuation | Mushroom head 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 | 2.0-3.3 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 M5PM21008GG
The AirTAC M5PM21008GG is a 5/2-way external control, direct acting valve that is thrown entirely by hand. There is no coil, no wiring and no pilot port, so it belongs to a different family from a solenoid valve: the green mushroom head on top is struck with a palm, and the spool changes over on muscle power alone. This suits panels and fixtures where electricity is unavailable, unwanted or simply unsafe, because the only energy the valve needs is the operator.
This example is the 200-series single control body with a G1/4 port and an effective area of 12.0 mm2 (Cv 0.67), the largest flow this family offers. The sliding-column spool means the changeover force is independent of working pressure, so the head feels and switches the same at 0.2 MPa as it does at 1.0 MPa. The control set is engineering plastic, so this head is for manual operation only - do not strike it with a tool or a moving machine part. The exhaust sits on top of the body, so a silencer screws straight in, and both body and panel mounting are supported.
Typical applications
Cycle start station on a palletising cell
An operator in gloves initiates each palletising cycle by striking the green mushroom head once; the spring returns it the moment the hand lifts, so a new palm strike is always needed for the next cycle.
Transfer conveyor directional change
A 100 mm bore cylinder swings a cross-transfer conveyor between two lanes; the G1/4 porting keeps the Cv 0.67 flow the cylinder needs for a brisk traverse, switched by a single palm press at the lane changeover point.
Fixture clamp release at a bench welding rig
The welder presses the large head to exhaust the clamp circuit and free the workpiece, then releases; the spring re-deselects the valve so the clamp can only ever be released by an explicit press.
How to choose
The choice you are really making here is between head shapes: a flat button (PF) resists accidental operation because it sits flush and needs a deliberate press, a protruding button (PP) is easier to find without looking, and this mushroom head (PM) has a large palm-sized face that can be hit with a gloved hand from any angle in one blind motion. If the state must hold after the operator walks away, move to the latching PL (press, then twist to release) instead. Within the 210 body you could also drop to the 1/8in port (Cv 0.50); stay with this G1/4 porting where the downstream cylinder is above roughly 80 mm bore and its flow demand matters. As always with this family, respect the published reversal limits: spool stroke 2.0-3.3 mm and button stroke 3.8-5.1 mm. Driving the head past these figures will damage the valve, so stop the operator's reach or fit a guard before it can over-travel.
Frequently asked questions
It is a 5/2-way mechanically actuated mushroom head valve on the 200-series body with a G1/4 port. Operating pressure is 0-1.0 MPa (0-145 psi) with a proof pressure of 1.5 MPa (215 psi), and it works from -20 to +70 C on air filtered by a 40 um element. The effective area is 12.0 mm2 (Cv 0.67). The aluminium alloy body needs no lubrication, though if lubricated air is introduced it should continue permanently; ISO VG32 or an equivalent grade is suggested.
AirTAC publishes exact reversal limits: the spool travels 2.0-3.3 mm and the button stroke is 3.8-5.1 mm. These are maximum strokes, not tolerances, and pressing beyond them damages the valve. Because this plastic control set is rated for manual operation only, it must never be tripped by a struck tool or a passing machine part either. Position the head so a palm strike naturally stops inside the range, or add a stop or guard behind it.