The AirTAC Airtac 4V Solenoid Valves 4V31008FT is a genuine 5/2-way single solenoid (spring return) solenoid valve with 31008FT 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 4V310-08FT is a single-solenoid 5/2 directional valve on the 4V300 body, machined with 1/4in NPT threads throughout, so supply, both outlets and both exhausts all take 1/4in NPT fittings. Energising the DC12V coil sends air to one side of a double-acting cylinder while venting the other; cut the power and the spring shifts the spool back, meaning the coil has to stay energised for the working stroke to hold. Response is 0.05 s or less and the 12 V coil draws just 2.5 W. Flow sits in the Cv 1.65 (28.0 mm2) class, enough to cycle Dia50 to Dia80 bores at up to 4 strokes per second - roughly 100 kgf of push at 0.5 MPa on a Dia50 cylinder and about 256 kgf on a Dia80. The body weighs 310 g, the terminal box is rated IP65 (DIN40050), the air must be filtered by a 40 um element, and the valve runs on 0.15-0.8 MPa with no lubrication needed.
| Model | Airtac 4V Solenoid Valves 4V31008FT |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Single solenoid (spring return) |
| Port size | 31008FT |
| Exhaust port | 31008FT |
| 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. |
| -31008FT | 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 12 V battery feeds the coil directly to raise a tipper's Dia80 hoist cylinder, worth about 256 kgf of push at 0.5 MPa; switching the control circuit off lets the spring drop the spool and lower the body without any pilot supply.
Tractor electrics suit the DC12V coil, and Cv 1.65 across a 1/4in port swings a Dia63 marker cylinder (about 159 kgf at 0.5 MPa) briskly, helped by the 0.05 s response when the marker is fired at the headland.
On caravans and small workboats the 2.5 W coil keeps the drain on a leisure battery low while the 1/4in NPT ports feed compact jack cylinders; the locking manual override shifts the spool by hand when the power is off.
Size both ways before you commit: step down to the 4V200 body (Cv 1.0) if you are driving a Dia40 or small Dia50 bore and the extra flow of this valve would simply be throttled back at the speed controller; step up to the 4V400 (Cv 2.82) for Dia100 cylinders or fast-press circuits where a Cv 1.65 valve would cap the stroke speed. Inside the 4V300 family, choose a 4V320 double-solenoid valve if you need the spool to remember its position after a power cut, or a 4V330C/E/P 5/3 valve (Cv 1.25, 3 cycles/s) when a cylinder has to stop mid-stroke. One valve screws directly into its ports; on a manifold base several bodies share one supply block, which saves plumbing on multi-cylinder machines. For a like-for-like replacement, match all five code points: 4V300 body, function 10 (single solenoid, spring return), 1/4in port with NPT thread, DC12V coil, and terminal-box entry - the pre-wired grommet version carries an I in the code instead of the T-thread styling you see here.
Quick checklist
It is a 5/2 spring-return valve with an effective area of 28.0 mm2 (Cv 1.65), response time of 0.05 s or less, and up to 4 cycles per second. Operating pressure is 0.15-0.8 MPa with a 1.2 MPa proof limit, the DC12V coil draws 2.5 W, the 1/4in NPT body weighs 310 g, and it is sized for double-acting cylinders of roughly Dia50 to Dia80 bore.
The 12 V coil (2.5 W) connects straight to vehicle and battery electrics without a converter, and the single-solenoid layout is fail-position: when power is lost the spring returns the spool and vents the cylinder the same way every time. A double-solenoid 4V320 instead keeps whatever position it was last pulsed to - that is a memory function, not a brake, so a suspended or overhead load still needs a pilot-operated check valve or a mechanical lock. Also remember the 5/2 valve needs its coil energised continuously to hold the working stroke.
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