The AirTAC Airtac 4V Solenoid Valves 4V31008A-W is a genuine 5/2-way single solenoid (spring return) solenoid valve with W 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 4V310-08A-W is a single-solenoid 5/2-way directional valve from the AirTAC 4V300 range, built this time with 1/4in PT tapered ports on every connection including both exhausts. The solenoid shifts the spool while energised and a return spring snaps it back the moment the coil drops out, so the machine PLC must hold the signal for the full stroke - a natural fit for push-and-retreat double-acting cylinder moves. With an effective area of 28.0 mm2 (Cv 1.65) it comfortably feeds Dia 50-80 mm bores. This exact SKU runs on AC220V through a 4.5 VA terminal-box coil, keeping coil heating low on continuously signalled stations. Response is 0.05 s or better, cycling reaches 4 strokes per second, and the aluminium body weighs only 310 g, so it mounts without stressing small manifolds or bracketry.
| Model | Airtac 4V Solenoid Valves 4V31008A-W |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Single solenoid (spring return) |
| Port size | W |
| Exhaust port | W |
| 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. |
| -W | 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.
Drives a Dia 63 mm double-acting punch cylinder (about 159 kgf push at 0.5 MPa) on small stamping and crimping benches, where Cv 1.65 keeps the downstroke brisk and the spring return guarantees the ram retreats when the signal is cut.
The 4.5 VA AC220V terminal-box coil taps straight into standard mains control wiring in older machines and panel retrofits, avoiding a dedicated 24 VDC power supply for a single valve station.
Cycles a Dia 80 mm box-push cylinder (roughly 255 kgf at 0.5 MPa) on a carton divert conveyor; with 1/4in exhaust ports mirrored on both sides, spent air vents freely and the arm reverses cleanly at up to 4 cycles per second.
Size down to the 4V200 body (Cv 1.0) if your cylinder is Dia 40-50 mm and you want a cheaper, lighter valve - a Dia 50 bore pushing roughly 98 kgf at 0.5 MPa does not need 4V300 flow. Step up to the 4V400 (Cv 2.82) once you pass Dia 80, for example a Dia 100 bore delivering about 398 kgf push at 0.5 MPa. Pick this single-solenoid version when the valve should always spring home on signal loss; choose a 4V320 double-solenoid if the actuator must stay put after a pulse. Replacing an existing unit? Match all five points: 4V300 body, function 10 (single 5/2), 1/4in PT ports, AC220V coil, and terminal-box entry - a grommet (-I) version will not drop onto the same wiring without reterminating. Bases accept manifold grouping, so several stations can share one supply gallery.
Quick checklist
Single-solenoid 5/2-way, effective area 28.0 mm2 (Cv 1.65), operating pressure 0.15-0.8 MPa with 1.2 MPa proof pressure, response 0.05 s or better, up to 4 cycles per second, AC220V coil drawing 4.5 VA, IP65 terminal box, weight 310 g. It suits roughly Dia 50-80 mm double-acting cylinders and needs air filtered to 40 um with no lubrication required.
The spool is held only by the energised coil, so the instant the AC220V signal drops the return spring shifts it back and the cylinder retracts (or extends, depending on porting) under spring position. This is a deliberate fail-back action, not a load brake: for a suspended or heavy load that must be positively stopped, add a pilot-operated check valve at the cylinder ports or a mechanical brake, because the valve alone does not lock the load.
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