Airtac M5HS Selector Mechanical Valve M5HS21008R
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5HS Selector Mechanical Valve M5HS21008R is a genuine 5/2-way selector switch type control valve. A turn-and-stay selector. Manual restoration, so it holds the selected state. 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 | M5HS21008R |
|---|---|
| Valve type | 5/2 way, external control, direct acting |
| Actuation | Selector switch type |
| Reset | Manual restoration - it holds the selected position |
| 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 | PT (Rc tapered) |
| Spool stroke | 2.0-3.3 mm |
| Actuator stroke | 5.1-6.4 mm at the selector |
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 M5HS21008R
The M5HS21008R is a 5/2 way external control, direct acting valve operated by turning its selector knob by hand. There is no coil, no pilot port and no electrical connection of any kind: the spool is thrown mechanically, which places it in a different family from the solenoid 4V series and the air pilot 4A series. Because nothing electrical is involved, it suits circuits where power is absent or unwanted - manual stations, purely pneumatic logic and areas where a coil would be a liability.
The HS selector head turns and stays: set it to a position and the valve holds that state until a person deliberately turns it back, which is manual restoration rather than spring return. The 210 body carries a 1/4in PT port and a 12.0 mm2 effective orifice (Cv 0.67), the largest flow figure in the M5 family. Its sliding-column construction means the changeover is not affected by working pressure - there is no back-pressure effect, so switching stays consistent anywhere from zero to 1.0 MPa. The control set here is engineering plastic and is for hand operation only; striking it with a tool is forbidden by the datasheet. The exhaust outlet sits on top of the body, so a silencer screws straight on.
Typical applications
Mode selection on a packaging machine
Turn the selector to arm the machine's pneumatic sequence before the start of a production run, then back for setup so setters can jog the sealing head by hand. The held position survives shift changes because nothing resets it automatically.
Fixture isolation during tool change
On a milling fixture, turn the selector to vent the clamp circuit while an operator swaps cutters. The state holds until the setter deliberately turns it back, so a brushed arm or falling rag cannot re-clamp mid-change.
Line changeover on a filling line
Use the turn-and-stay selector to divert supply between the circuit for filler A and the circuit for filler B at a product changeover. The knob position shows at a glance which line is live, unlike a lever that springs back and hides the state.
How to choose
If you are weighing HS against Y or PL, the real question is how the held state should be commanded: the Y lever is thrown and stays, the PL button latches on a press and releases with a twist, while HS is a turn-and-stay selector that reads like a mode switch on a panel, which suits AUTO/MANUAL selection. If you only need the valve to pulse while pressed, the spring-return PM mushroom or PF flat button on the same body is the wrong neighbour for this job but the right one for a two-hand strike. Within the family, stepping from the 210 to the 110 body drops you to an 8.0 mm2 orifice at 1/8in only; stepping port 06 to 08 inside the 210 body raises flow from 9.0 to 12.0 mm2, so size against the cylinder bore. Respect the reversal stroke: the selector travels 5.1-6.4 mm against a spool stroke of 2.0-3.3 mm. Beyond these published limits the valve is damaged, and AirTAC states this explicitly.
Frequently asked questions
Operating pressure is 0-1.0 MPa (0-145 psi) with proof pressure of 1.5 MPa (215 psi), and media temperature spans -20 to +70 C using air filtered by a 40 um element. The 210 body has a 1/4in PT port and a 12.0 mm2 effective orifice (Cv 0.67). The body is aluminium alloy and lubrication is not required, although once lubricated air has been introduced it should be kept up - AirTAC suggests ISO VG32 or an oil of the same grade.
The published reversal stroke is 5.1-6.4 mm at the selector against a spool stroke of 2.0-3.3 mm. These are limits, not guidance: exceeding them damages the valve, as AirTAC states explicitly. Because the spool only needs 2.0-3.3 mm to change over, the extra travel is built into the head deliberately, so stop at the firm end of travel rather than forcing past it. Replacement selector control sets can be ordered separately as spares if a head is ever damaged in service.