The AirTAC Airtac 4V Solenoid Valves 4V31008AIG is a genuine 5/2-way single solenoid (spring return) solenoid valve with 31008AIG ports and an effective area of 28.0 mm² (Cv 1.65). It is an internally piloted spool valve that directs compressed air to double-acting cylinders and actuators.
The 4V310-08AIG is a 4V300-body 5/2 single-solenoid directional valve with all ports in 1/4in PT (inlet, outlet and exhaust alike) and an AC220V coil pre-wired through a DIN-style grommet lead of roughly 0.5 m. Energising the coil shifts the spool and feeds air to one side of a double-acting cylinder while the opposite side vents; cutting the signal lets the spring snap the spool home, so the actuator always returns to a defined rest position when power or the command signal fails. Its effective area of 28.0 mm2 (Cv 1.65) places it in the flow class that suits roughly Dia 50-80 mm bores. Response is 0.05 s or better at up to 4 cycles per second, and the AC220V coil draws only 4.5 VA, keeping panel transformer load small. The aluminium body weighs 310 g, works on 0.15-0.8 MPa (proof 1.2 MPa) of 40 um-filtered, unlubricated air from -20 to +70 C, and is sealed to IP65 (DIN40050) with class B insulation. A locking or non-locking manual override lets you jog the cylinder during set-up with no electrical input, and the valve can also sit on a manifold base in a multi-station block.
| Model | Airtac 4V Solenoid Valves 4V31008AIG |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Single solenoid (spring return) |
| Port size | 31008AIG |
| Exhaust port | 31008AIG |
| Effective area (Cv) | 28.0 mm² (Cv 1.65) |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Pilot type | Internal / external pilot |
| Operating pressure | 0.15 – 0.8 MPa |
| Proof pressure | 1.2 MPa |
| Max frequency | 4 cycle/sec |
| Response time | ≤ 0.05 s (activating) |
| Temperature | -20 to +70 °C |
| Body material | Aluminum alloy |
| Weight | 310 g |
Specifications follow the official AirTAC 4V series datasheet. Lubrication not required. Confirm coil voltage and thread (PT / NPT / G) against the product label before wiring.
| Effective area | 28.0 mm² |
|---|---|
| Flow coefficient | Cv 1.65 |
| Response time | ≤ 0.05 s |
| Coil power | AC 4.5 VA · DC24V 3.0 W · DC12V 2.5 W |
| Protection / insulation | IP65 (DIN40050), B-class |
| Voltage options | DC24V, DC12V, AC110V, AC220V |
| Manual override | Yes (locking / non-locking) |
Size the valve so effective area / Cv is not the bottleneck for your cylinder bore and speed. Undersized valves slow the actuator. Note 5/3 (center) versions have a smaller effective area than the 5/2 of the same body size.
| 4V | Solenoid valve, spool type, 4-series. |
|---|---|
| 3 | Body size (4V300) — sets port & flow. |
| 1 | Function: 1 = single 5/2, 2 = double 5/2, 3 = 5/3. |
| -31008AIG | Port thread: M5 / 06=1/8" / 08=1/4" / 10=3/8" / 15=1/2". |
Related: 4V310 (single), 4V320 (double), 4V330C/E/P (5/3 center). Add the voltage suffix when ordering.
A Dia 63 mm cylinder on a small aluminium die-cast trim press delivers about 1558 N at 0.5 MPa; the Cv 1.65 orifice supports its 4 cycle/s spring-return stroke so the ram always withdraws to top position between cuts.
Pusher gates that kick off-spec bottles from a filling conveyor need a decisive home position; the spring return plus 0.05 s response clears the lane the instant the reject signal drops.
A Dia 50 mm clamp cylinder (about 981 N at 0.5 MPa) stays closed only while the coil is held, so a broken wire or E-stop automatically unclamps the workpiece - the fail-safe direction a 4V310 is chosen for.
Match the valve to the bore, not the other way round. For Dia 50 mm cylinders (about 981 N push at 0.5 MPa) or anything smaller, the 4V200 series at Cv 1.0 is the more economical, faster-cycling choice; once you grow to Dia 80 mm (about 2513 N push) or beyond, step up to the 4V400 body with Cv 2.82 so exhaust throttling does not slow retraction. On function: pick this single-solenoid version when a lost signal must spring the cylinder back to home, the double-solenoid 20 when it must remember its last pulsed position, and a 30C/30E/30P 5/3 valve only when a mid-stroke stop, float or equalise is genuinely needed. The 08 port keeps every passage at 1/4in, which keeps fitting costs down on short air lines. Swapping an old unit? Check five points before ordering: 4V300 body size, function digit 10, 1/4in port in PT thread, AC220V coil, and grommet (I) entry with the 0.5 m flying lead. If your cabinet prefers hard conduit, the terminal-box version of the same valve shares every other dimension.
Quick checklist
In one place: 5/2 single solenoid, spring return; effective area 28.0 mm2, Cv 1.65, max 4 cycles/s; activating time 0.05 s or less; working pressure 0.15-0.8 MPa with 1.2 MPa proof; all three ports 1/4in PT including exhaust; AC220V coil at 4.5 VA, insulation class B, protection IP65 (DIN40050); weight 310 g; air filtered to 40 um, lubrication not required, temperature -20 to +70 C.
The I suffix means the coil exits through a DIN-style grommet with about 0.5 m of pre-wired flying leads, so you land the wires straight on your terminal strip - useful in cramped panels or on a moving slide where a rigid conduit box would flex and fatigue. Functionally it is identical to the terminal-box version: same AC220V, 4.5 VA coil, same IP65 sealing. If your plant standardises on conduit, order the same valve without the I and use the box.
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