Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008G
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008G 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.
$30.93 $35.38Save 12%- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
Specifications
| Model | M5PM21008G |
|---|---|
| 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 M5PM21008G
The M5PM21008G is a 5/2-way external control, direct acting valve that is thrown by hand, not by electricity: there is no coil, no pilot port and no wiring anywhere on it. A large green mushroom head sits proud of the body so an operator can palm-strike it without looking, and a spring throws the spool straight back the moment the palm lifts. This is the 200 Series single-control body on 1/4 inch PT ports, with a 12.0 mm2 effective area (Cv 0.67).
Because the spool is a sliding column, the force needed to switch it is not affected by working pressure - there is no back-pressure effect, so the green head feels identical at 0.2 MPa and at 0.9 MPa. The exhaust sits on top of the body, so a silencer screws straight in where it is easy to reach. The plastic control set is rated for manual operation only: striking it with a hammer or tool is forbidden by AirTAC and will damage it.
Typical applications
Cycle-start button on a packaging machine
Mounted at panel level beside the infeed conveyor, the green palm head gives the operator a full-hand start that lands right first time, and the spring return drops the valve back to neutral the instant the hand lifts.
Two-hand clamp station on a workbench fixture
Pair two palm-operated valves so both hands are on the buttons while the pneumatic clamp closes, keeping fingers clear of the jig; the mechanical 5/2 circuit needs no electrical safety wiring in the loop.
Bench-top pneumatic training rig
The big green head is forgiving for students learning valve actuation symbols and 5/2 circuits, and the top-mounted exhaust accepts a silencer so the lab bench stays quiet during long sessions.
How to choose
Choose the mushroom head over the M5PP protruding button when the operator must find and hit the control fast and flat-palmed, and over the M5PF flat button when accidental operation matters more than speed - the PF is flush and resists a bump, the PM invites a hit. All three are spring return; if the machine must hold its state after the press, step to the M5PL latching button (twist to release) or the M5HS selector instead. Green is the right colour choice where red is reserved for stop functions on the panel; black is the neutral alternative.
On size, this 210 body flows 12.0 mm2 (Cv 0.67) through PT1/4, while the same head on the 110 body manages 9.0 mm2 and has no colour code at all; if your cylinder bore needs less, M5PM21006 in 1/8 inch gives 9.0 mm2. Mind the published reversal stroke: the spool travels 2.0-3.3 mm and the button 3.8-5.1 mm, and hitting it harder than that damages the valve.
Frequently asked questions
It is a 5/2-way external control, direct acting valve on the 200 Series body with PT1/4 ports and a green mushroom head. Working pressure is 0-1.0 MPa (0-145 psi), proof pressure 1.5 MPa (215 psi) and fluid temperature -20 to +70 C on filtered air (40 um element). Effective area is 12.0 mm2, Cv 0.67. Body is aluminium alloy; no lubrication is needed, though once lubricated air is used, keep to the same medium (ISO VG32 or equivalent).
AirTAC publishes a reversal stroke of 2.0-3.3 mm for the spool and 3.8-5.1 mm for the button on this model. Exceeding those limits damages the valve - the datasheet says so explicitly - so do not hammer it or let a machine part slam the head. The plastic control set is for manual palm operation only, and spare control sets can be ordered separately if one ever needs replacing.