Airtac M5HS Selector Mechanical Valve M5HS21008BG
Mechanically actuated · no coil, no pilot airThe AirTAC Airtac M5HS Selector Mechanical Valve M5HS21008BG 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 | M5HS21008BG |
|---|---|
| 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 | 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 | 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 M5HS21008BG
The M5HS21008BG is a 5/2-way external control, direct acting valve with no coil and no pilot port: a black selector knob is turned by hand and the spool switches the five ports mechanically. That makes it the valve for circuits where electricity is absent or unwanted. It sits on the 200 Series single-control body with G1/4 ports and an effective area of 12.0 mm2 (Cv 0.67).
Restoration is manual - turn the knob and it stays there until you deliberately turn it back, so a chosen circuit state is held without continuous effort. The sliding-column spool means the changeover is not affected by working pressure: there is no back-pressure effect anywhere across the 0-1.0 MPa range. The exhaust outlet is on top of the body, so a silencer screws straight on for a quiet installation. The selector is an engineering plastic control set for hand operation only - striking it with a tool is forbidden by the datasheet.
Typical applications
Mode selector on a packaging machine panel
On a cartoning or filling line, the black knob selects between jog and automatic pneumatic circuits. The turn-and-stay action keeps the chosen mode held until an engineer deliberately turns it back, with no electrical interlock needed.
Clamp isolation during jig tool change
Fitted in the clamp circuit of a welding fixture, the selector vents and isolates the clamp supply while dies or jigs are swapped. The state holds by hand, so no operator has to stand there keeping a lever pressed.
Section shut-off on an assembly workbench
At a pneumatic assembly bench, the selector acts as a stay-put cut-off for one section of the circuit, letting a technician de-pressurise that leg and leave it off while working downstream.
How to choose
The nearest neighbour is the M5Y lever type, which also holds position, but a lever is flicked while a selector is turned to a position and left; pick the HS when the state must sit visibly and stably on a panel, and the Y when an operator sweeps past with a hand. On body and port, the 110 variant offers 1/8" ports at 8.0 mm2; this 210 body at 1/4" gives 12.0 mm2 (Cv 0.67), so step up to it when the downstream cylinders need the extra flow. Mind the reversal stroke: the selector travels 5.1-6.4 mm and the spool 2.0-3.3 mm. Exceeding these limits damages the valve - AirTAC states this explicitly - so stops and keying must end travel inside the window.
Frequently asked questions
It is a 5/2-way, external control, direct acting valve operated mechanically by a black selector knob - there is no coil. Pressure range is 0-1.0 MPa (0-145 psi) with a 1.5 MPa (215 psi) proof pressure, media temperature -20 to +70 C, and air filtered by a 40 um element. Ports are G1/4 on the 200 Series aluminium body, effective area 12.0 mm2 (Cv 0.67), lubrication not required. If lubricated air is introduced, AirTAC advises continuing with ISO VG32 or the same grade to optimise valve life.
The published reversal stroke is 5.1-6.4 mm at the selector, which throws the spool 2.0-3.3 mm. Exceeding these limits damages the valve, and AirTAC says so explicitly, so stops, cams or keying must end travel inside the window. The plastic control set is for hand turning only - never strike it with a tool. If the control set eventually wears, a replacement set can be ordered separately as a spare.