Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008RG
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008RG 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 | M5PM21008RG |
|---|---|
| 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 | 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 M5PM21008RG
The M5PM21008RG is a 5/2-way external control, direct acting valve that is thrown entirely by muscle: a large red mushroom head sits proud of the 200-series body, and a palm strike - even through a glove, without looking - shifts the spool and sends the cylinder the other way. There is no coil and no pilot port, so it belongs in the hand-operated M5 family, not with the solenoid 4V or air-piloted 4A valves. The head is spring restored, so the valve snaps back the instant your hand lifts. This example carries the 210 body with G1/4 ports and a 12.0 mm2 effective area (Cv 0.67), the largest flow in the common-type range.
The sliding-column spool means operating force does not change with working pressure, so the head feels the same at 0.2 MPa as it does at 1.0 MPa and changeover stays consistent right across the range. Because the exhaust port faces upward, a silencer screws straight onto the top of the aluminium body - the quietest way to mount one. The engineering-plastic control set is rated for hand operation only, so never strike it with a hammer or bar; body or panel mounting both work, and spare control sets can be ordered separately if a head takes abuse.
Typical applications
Bench press cycle start
Mounted at the front of a small pneumatic bench press, the mushroom head gives the operator a full-palm target for cycle start. Gloves stay on, aim does not matter, and the spring return drops the cylinder the moment the hand lifts.
Weld fixture clamp reversal
A fitter loading brackets into a welding fixture strikes the head to swing a clamp cylinder clear, seats the part, and releases. Spring restoration re-presents the valve automatically for the next piece.
Packaging machine jog station
During carton line setup, an engineer palm-strikes the valve to advance the chain one station at a time. Each strike sends one reversal and the spring return readies the next, so jogging stays a one-hand operation.
How to choose
You are really choosing between three palm-operated heads. The PF flat button resists accidental knocks and the PP protruding button needs a deliberate press, but the PM mushroom head is the biggest target of the three - it is the one to pick where an operator may be wearing gloves, working fast or striking without precise aim. If the valve must HOLD its position after it is pressed, step sideways to the PL latching or Y lever types instead, which are manual restoration; the PM always springs back. On flow, this 210 body with 1/4in ports gives 12.0 mm2 (Cv 0.67) against 9.0 mm2 (Cv 0.50) for the same body in 1/8in, so size the port to the cylinder bore. Respect the published reversal strokes: the spool travels 2.0-3.3 mm and the button 3.8-5.1 mm, and AirTAC warns explicitly that exceeding these limits damages the valve.
Frequently asked questions
It is a 5/2-way external control, direct acting valve with a red mushroom head and G1/4 ports on the 210 body. Working pressure is 0-1.0 MPa (0-145 psi) with a proof pressure of 1.5 MPa (215 psi), over a temperature range of -20 to +70 C. Effective area is 12.0 mm2 (Cv 0.67), the body is aluminium alloy, and the air must be filtered to 40 um. Lubrication is not required, though once lubricated air is introduced you should continue with it - AirTAC suggests ISO VG32.
Hit it with your palm - the datasheet forbids striking the plastic control set with a tool. The published reversal strokes are the real limit: the spool stroke is 2.0-3.3 mm and the button travel 3.8-5.1 mm. Exceeding these figures damages the valve, so fit a strike pad or mechanical hard stop if the head is mounted where an operator can lean on it, rather than letting full body weight travel the button to its mechanical end.