The AirTAC Airtac 4V Solenoid Valves 4V21008F-W is a genuine 5/2-way single solenoid (spring return) solenoid valve with W ports and an effective area of 17.0 mm² (Cv 1.0). It is an internally piloted spool valve that directs compressed air to double-acting cylinders and actuators.
The 4V21008F-W is the DC12V build of the AirTAC 4V210 single-solenoid 5/2 valve: one coil shifts the spool to pressurise one side of a double-acting cylinder while the other side exhausts, and a return spring sends the spool back the moment the coil is de-energised, so the actuator always parks in a defined home position. The PT-threaded 1/4 in ports are matched by a 17.0 mm2 effective area (Cv 1.0), which suits double-acting cylinders in roughly the O32 to O50 bore range. Because this SKU carries the F voltage code, it runs a 12 V DC coil drawing just 2.5 W - an easy load for battery supplies, alternator-fed circuits or long cable runs where 24 V or AC coils are impractical. Power reaches the coil through a terminal box rather than a moulded lead, so wiring swaps take seconds on the machine. Response is 0.05 s or better, the aluminium body weighs about 220 g, and the valve needs no lubrication - only air filtered by a 40 um element.
| Model | Airtac 4V Solenoid Valves 4V21008F-W |
|---|---|
| Series | 4V200 solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Single solenoid (spring return) |
| Port size | W |
| Exhaust port | W |
| Effective area (Cv) | 17.0 mm² (Cv 1.0) |
| 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 | 5 cycle/sec |
| Response time | ≤ 0.05 s (activating) |
| Temperature | -20 to +70 °C |
| Body material | Aluminum alloy |
| Weight | 220 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 | 17.0 mm² |
|---|---|
| Flow coefficient | Cv 1.0 |
| 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. |
|---|---|
| 2 | Body size (4V200) — 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: 4V210 (single), 4V220 (double), 4V230C/E/P (5/3 center). Add the voltage suffix when ordering.
Boom lift and gate cylinders on sprayers, spreaders and towed trailers run straight from a 12 V battery; the 2.5 W coil keeps the draw light and the spring return guarantees the actuator retracts if the circuit cuts.
A 12 V vehicle supply shifts this Cv 1.0 valve to extend a PTO or tipper cylinder on O40-O50 bores, with the terminal box giving vibration-tight screw terminals instead of fragile flying leads.
Bench-mounted clamping rams on service vehicles benefit from the 0.05 s shift for fast clamping, IP65 sealing against washdown spray, and a locking manual override for setup by hand.
Size down when the bore is small or slow: the 4V100 body (Cv 0.6) is enough for a compact O32 cylinder on short strokes, and it costs less panel space. Size up when you need a faster cycle or a bigger bore: the 4V300 (Cv 1.65) nearly doubles the flow for O50-plus cylinders or high-speed pushers. Within the 4V200 range this 10-function valve is the pick whenever the cylinder must spring back on signal loss; choose the double-solenoid 4V220 instead if you need a memory position, or a 5/3 4V230 variant if the cylinder must hold, float or stay pressurised at centre. A single valve suits standalone stations; a base-mounted manifold suits multi-valve cabinets. To replace an existing unit, match five points: 4V200 body size, function digit 10, port and thread (1/4 in PT here), coil voltage (DC12V) and electrical entry (terminal box). Note that even though the in/out ports are 1/4 in, the exhaust port on this body is 1/8 in - a detail often missed when ordering silencers or fittings.
Quick checklist
Effective area 17.0 mm2 (Cv 1.0) through 1/4 in PT in/out ports with a 1/8 in exhaust. Response is 0.05 s or less, max cycling 5 per second, operating pressure 0.15-0.8 MPa with 1.2 MPa proof pressure, temperature -20 to +70 C. The DC12V coil draws 2.5 W at IP65 (DIN40050), insulation class B, and the valve weighs about 220 g. Air must be filtered by a 40 um element; lubrication is not required.
The return spring drives the spool back to its rest position immediately, so the cylinder retracts (or extends, depending on plumbing) every time power is lost - a fail-to-home action that is often wanted on mobile equipment. The trade-off is that the coil must stay energised for the whole stroke; if you only need a pulse to switch and hold position without power, look at the double-solenoid 4V220 instead.
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