The AirTAC Airtac 4V Solenoid Valves 4V31008EIT is a genuine 5/2-way single solenoid (spring return) solenoid valve with 31008EIT 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 AirTAC 4V310-08EIT is a single-solenoid 5/2 directional valve that switches compressed air between the two ports of a double-acting cylinder. Energise the coil and the spool shifts to extend the actuator; cut power and the built-in spring returns the spool, so the cylinder retracts on every de-energise. Because it needs a constant electrical signal to stay shifted, it is a natural fit for fail-to-home stations. This exact SKU pairs a 1/4in NPT port size with an AC24V coil on a grommet entry, meaning the valve arrives with a 0.5 m pre-wired flying lead instead of a terminal box, and the low 24V AC coil draws just 5.0 VA. In the 4V300 flow class it offers an effective area of 28.0 mm2 (Cv 1.65) and cycles up to 4 times per second, matching AirTAC bore sizes around Dia50 to Dia80 mm. The spool responds in 0.05 s or less, the aluminium body weighs about 310 g, and the whole valve meets IP65 (DIN40050) with a B-class insulation system. Air to the pilot stage must be filtered by a 40 um element, and lubrication is not required.
| Model | Airtac 4V Solenoid Valves 4V31008EIT |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Single solenoid (spring return) |
| Port size | 31008EIT |
| Exhaust port | 31008EIT |
| 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. |
| -31008EIT | 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.
Clamps a workpiece with a Dia63 cylinder delivering about 159 kgf at 0.5 MPa. The spring return opens the clamp the moment the AC24V signal drops, so a power fault cannot leave the part locked in the vise.
Cv 1.65 flow fills a Dia80 pusher cylinder fast enough for 4 cycles per second, sweeping boxes off a conveyor into a case packer at line speed.
Directs a Dia50 to Dia80 lifting cylinder, roughly 100 to 256 kgf push at 0.5 MPa. The grommet lead wires straight to the vehicle's 24V AC control circuit with no terminal box to seal against washdown.
Switches a double-acting gripper cylinder on a robotic palletizer, with the 0.05 s response keeping grip-and-release timing tight across every pick cycle.
Check the valve against your bore before ordering. This Cv 1.65 body suits roughly Dia50 to Dia80 mm double-acting cylinders: about 100 kgf push at 0.5 MPa on Dia50, about 159 kgf on Dia63 and about 256 kgf on Dia80. If your bore is Dia40 or smaller, step down to the 4V200 (Cv 1.0); for Dia100 bores and above, move up to the 4V400 (Cv 2.82). Choose this 10 function when you want a defined spring-return position, the 20 function if you need the spool to remember its last pulse, or a 30C/E/P 5/3 model if the cylinder must hold, float or balance at center. Buying one valve? Order it with the entry style you want. Wiring many valves? Any 4V300 can mount on a common manifold base to share one air supply and one wiring run. For a like-for-like replacement, match five points: 4V300 body, function code (10), port and thread (1/4in, NPT here), coil voltage (AC24V) and electrical entry (grommet, this code).
Quick checklist
Flow capacity is Cv 1.65 with an effective area of 28.0 mm2, and the valve cycles up to 4 times per second. Response (activating) time is 0.05 s or less. Operating pressure spans 0.15-0.8 MPa with a 1.2 MPa proof pressure, and the media temperature range is -20 to +70 C. The AC24V coil consumes 5.0 VA, protection is IP65 (DIN40050), and the valve weighs about 310 g.
This is a single-solenoid 5/2 valve: the cylinder only stays extended while the coil is energised. De-energise it and the internal spring shifts the spool back, sending the double-acting cylinder to its home position. If you need the actuator to stay put after a power cut, use a double-solenoid 4V320 (memory function) instead, and add pilot-operated check valves or a mechanical brake wherever a suspended load must be held securely.
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