Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008BG
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5PM Mushroom Push Button Type Mechanical Valve M5PM21008BG 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 | M5PM21008BG |
|---|---|
| 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 | 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 | 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 M5PM21008BG
The M5PM21008BG is a 5/2-way external control, direct acting valve that is thrown entirely by hand - a large black mushroom head takes the place of a solenoid coil, so there is no wiring, no voltage rating and no pilot port anywhere on this valve. Press the head with a palm or fist to shift the spool and send supply to one cylinder port while the other exhausts; release it and a spring snaps the spool straight back. It belongs to the 200 Series single control body (210) with a G1/4 port, and the orifice gives an effective area of 12.0 mm2 (Cv 0.67), the largest flow rating in the M5 family.
Because the sliding-column spool does not work against back pressure, the control force needed to shift the valve stays the same whether the line is near zero or at the full 1.0 MPa. The mushroom head uses an engineering plastic control set, so it is designed for manual operation only - never strike it with a hammer or machine part. A further installation convenience: the exhaust outlet sits on top of the body, so a silencer screws straight on without re-plumbing.
Typical applications
Palm-start cycle button on a bench crimping press
An operator holding a wire harness in one hand presses the wide black mushroom head with the other palm to fire the crimp cylinder, then lets go; the spring returns the spool and the ram retracts every cycle without any electrical start circuit.
Manual jog station on a conveyor transfer point
Mounted at a panel on a packaging line conveyor, the mushroom head lets a technician nudge cartons through a jam by holding the valve shifted for as long as needed, releasing it the moment the line runs free.
Clamp-and-release control on a welding fixture
Fitted to the fixture plate beside the clamp cylinder, the large head is hit with a gloved hand to clamp a steel bracket, and the automatic spring return vents the cylinder the instant the hand is withdrawn - a fail-safe posture with zero wiring in the weld cell.
How to choose
Within the 210 body you are really choosing between button shapes: the flat PF head resists accidental hits, the protruding PP head is easier to find without looking, and this mushroom PM head offers the biggest target of all - ideal when an operator strikes it with a gloved palm mid-task and cannot aim precisely. If instead you need the valve to hold its last position after the press, look at the latching PL or the manual-restoration Y and HS types, not this spring-return mushroom.
The 210 body in G1/4 is the highest-flow M5 combination at 12.0 mm2 (Cv 0.67); stepping down to the 1/8-inch version of the same body drops you to 9.0 mm2 (Cv 0.50), so match the port to the cylinder bore before you commit. Whichever you pick, respect the published reversal stroke: the spool travels 2.0-3.3 mm and the mushroom button 3.8-5.1 mm, and driving the head past those limits will damage the valve.
Frequently asked questions
It is a 5/2-way external control, direct acting, mechanically actuated valve with a black mushroom head and automatic spring restoration. Working pressure is 0-1.0 MPa (0-145 psi) with a proof pressure of 1.5 MPa (215 psi), operating temperature -20 to +70 C, and a G1/4 thread port on the 200 Series (210) body. The effective orifice area is 12.0 mm2 (Cv 0.67). The medium is air filtered by a 40 um element, the body is aluminium alloy, and lubrication is not required - though if lubricated air is used, keep using the same medium, with ISO VG32 or equivalent suggested.
The published reversal stroke for the M5PM is 2.0-3.3 mm at the spool and 3.8-5.1 mm at the button. Those are hard limits, not guidelines: AirTAC states explicitly that exceeding them damages the valve, so the mechanical stop on whatever actuates the head must bottom out within that window. If you need a longer travel figure, a different actuator in the same family - for example the M5C long handle at 11.0-16.0 mm - offers far more stroke.