The AirTAC Airtac 4V Solenoid Valves 4V31008AG is a genuine 5/2-way single solenoid (spring return) solenoid valve with 31008AG 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 4V310-08AG is a 5/2-way single-solenoid valve from the AirTAC 4V300 body family, built here as a 1/4in (08) ported unit with G (BSPP parallel) threads and an AC220V coil rated at 4.5 VA on a terminal-box entry. It directs compressed air to one side of a double-acting cylinder while exhausting the other, and because it is spring return it must receive a continuous electrical signal to stay shifted - cutting power lets the internal spring snap the spool back to its rest position in 0.05 s or less. With an effective area of 28.0 mm2 (Cv 1.65) and a 4 cycle/sec switching rate, this body sits in the mid-flow band of the 4V series and suits roughly Dia50-80 mm bores. The aluminium body runs on air filtered by a 40 um element, needs no lubrication, is sealed to IP65, and the whole valve weighs just 310 g, so panel space and bracket loads stay modest.
| Model | Airtac 4V Solenoid Valves 4V31008AG |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Single solenoid (spring return) |
| Port size | 31008AG |
| Exhaust port | 31008AG |
| 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. |
| -31008AG | 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 Dia63 bore developing about 158 kgf push at 0.5 MPa is well matched to Cv 1.65, and the spring-return action guarantees the bottle-stop gate drops back the instant the AC220V signal is lost.
Dia80 clamp cylinders on a machining centre draw roughly 255 kgf at 0.5 MPa; the 4 cycle/sec rate keeps clamp-unclamp dwell short on parts loaded every few seconds.
Pushing cases down a chute with a Dia63 stroke-action cylinder, the 28.0 mm2 effective area fills the bore fast enough to hold a steady pack rate while the terminal box simplifies cabinet wiring.
Sizing both directions: for a Dia40-50 bore doing lighter work, the 4V200 body (Cv 1.0) is the step down and costs less per cycle; for Dia80-100 bores or longer stroke cycles that need more fill, move up to the 4V400 body (Cv 2.82). Within 4V300, choose the single solenoid 10 version when you want the cylinder to always park at a defined rest position on power loss, the double solenoid 20 when you need memory, or a 30C/E/P 5/3 when mid-stroke control matters - note the 5/3 trims flow to 21.3 mm2 / Cv 1.25 and 3 cycles/sec. A single valve on a manifold base is the tidy choice when several stations share one supply. Ordering a drop-in replacement means matching all five points: 4V300 body size, function 10, 1/4in port with G thread, AC220V coil, and terminal-box entry - the AG suffix on 4V310-08AG already locks these in.
Quick checklist
Effective area 28.0 mm2 with a Cv of 1.65, activating response 0.05 s or below, operating pressure 0.15-0.8 MPa with 1.2 MPa proof pressure, and a maximum switching rate of 4 cycles/sec in the 5/2 configuration. The AC220V coil draws 4.5 VA, protection is IP65 (DIN40050) with class B insulation, air must be filtered to 40 um, and the working temperature spans -20 to +70 C.
Because the 4V310-08AG is single solenoid with spring return, the spool is held by the coil's continuous signal and is pushed back by the spring as soon as power drops, sending the double-acting cylinder to its rest position. That makes it a good match for return-to-home motions, but it is not a load-holding device - for suspended loads add a pilot-operated check valve at the cylinder ports or a mechanical brake.
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