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 4V310-08EIT is a 5/2-way single-solenoid directional valve from AirTAC's 4V300 series, built to switch compressed air between the two sides of double-acting cylinders and actuators. Energise the coil and the valve shifts; cut the signal and the internal spring returns the spool to its rest position automatically, so the cylinder always returns to a defined end when the electrical signal is lost. With an effective area of 28.0 mm2 (Cv 1.65) and a response time of 0.05 s or less, this body size comfortably serves cylinders in the roughly O50-80 mm bore range.
This exact SKU is wired for AC24V (5.0 VA) and uses a grommet electrical entry, meaning the coil comes with a 0.5 m pre-wired flying lead instead of a terminal box - handy for tight control cabinets or quick drop-in swaps. The port size is 1/4" with NPT (tapered) threads on all stations, and the complete valve weighs just 310 g. The aluminum body carries an IP65 (DIN40050) rating, needs no lubrication, and can be docked onto a manifold base to build a multi-valve group.
| 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.
The spring-return 5/2 function and Cv 1.65 flow class suit medium-bore press cylinders around O50-80 mm, where the workpiece must retract automatically whenever the solenoid signal drops.
On machine-tool fixtures, the guaranteed spring return gives a predictable clamp-or-release state, and the 0.05 s response keeps cycle times tight on repetitive clamping moves.
Double-acting handling actuators get brisk, repeatable switching at up to 4 cycles per second, with the 310 g valve body mounting directly or on a shared manifold near the actuator.
Size first: if your cylinder is smaller than about O50 mm bore, the 4V200 series (Cv 1.0) is usually the more economical match, while bores approaching O80 mm and above justify stepping up to the 4V400 (Cv 2.82). Choose a single solenoid like this one when the actuator must spring back on signal loss; pick the double-solenoid 4V320 for memory action, or a 4V330C/E/P 5/3 version when you need a defined center condition. One valve suits stand-alone stations; order a manifold base if several valves share one supply.
Replacing an existing unit? Match all five points: body size (4V300), function (10 = single solenoid, 5/2), port and thread (1/4" NPT here), coil voltage (AC24V), and electrical entry (grommet lead, not terminal box). The EIT suffix on this code captures all three electrical/thread options at a glance.
Quick checklist
It is a 5/2-way valve for double-acting cylinders and actuators, sized for bores of roughly O50-80 mm. AirTAC rates the 5/2 4V300 body at an effective area of 28.0 mm2 (Cv 1.65) with a maximum switching frequency of 4 cycles per second; no single L/min flow figure is published, so use the Cv value for your own flow calculations.
The EIT suffix defines it: E is the AC24V coil (5.0 VA), I is a grommet entry with a 0.5 m pre-wired lead in place of a terminal box, and T is NPT tapered threading on the 1/4" ports. When ordering a replacement, keep all three attributes identical - or choose the plain-code, B, C or F voltage variants if your control system differs.
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