The AirTAC Airtac 4V Solenoid Valves 4V21008FT-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 4V21008FT-W is a 4V200-body, single-solenoid 5/2 directional valve with 1/4in NPT ports and a 12 V DC coil drawing just 2.5 W. Energise the coil and air flows to one side of a double-acting cylinder while the other side vents; cut the signal and the internal spring snaps the spool back, so the cylinder always parks in a defined position. The NPT tapered thread suits North American pipework without adapters. Flow sits in the mid class at 17.0 mm2 effective area (Cv 1.0) with a response time of 0.05 s or less and up to 5 cycles per second, which comfortably serves double-acting cylinders around Dia32-50 mm. The body weighs 220 g in aluminium alloy, needs no lubrication, carries IP65 protection on the terminal-box coil and runs on air filtered to 40 um.
| Model | Airtac 4V Solenoid Valves 4V21008FT-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.
Truck-mounted and mobile packaging rigs run everything from a 12 V battery bank, and the 2.5 W DC12V coil keeps the drain trivial while the Cv 1.0 flow cycles a Dia40 pusher cylinder at full line speed.
A Dia40 diverter cylinder develops about 64 kgf of push at 0.5 MPa, enough to kick cartons off a line, and the <=0.05 s switching time keeps the gate sharp at up to 5 divert actions per second.
Low-voltage lab and QA benches favour 12 V for operator safety; this valve's spring return guarantees the Dia32-50 test cylinder retracts whenever the PLC signal drops, with no lubrication upkeep.
Size in both directions before ordering. A Dia32 bore only produces about 41 kgf of push at 0.5 MPa, so the smaller 4V100 body (Cv 0.6) is usually the cheaper, leaner match. A Dia50 bore pushes roughly 100 kgf, and if your cycle rate approaches the 5 per second ceiling of the 4V200, the 4V300 (Cv 1.65) breathes easier and runs faster. Within the 4V200 line, stay on this single-solenoid spring-return type when you want a guaranteed park position on signal loss; choose a double-solenoid 4V220 for pulsed memory operation or a 4V230C/E/P for mid-stroke stop, float or equalise. For a one-for-one swap, match five points: 4V200 body, function digit 10, 1/4in NPT port, DC12V coil, terminal-box entry. Individual bodies also mount on a common base to form an integrated manifold group.
Quick checklist
It is a 5/2 spring-return valve for double-acting cylinders and actuators in the Dia32-50 mm range. Key figures in one place: effective area 17.0 mm2 (Cv 1.0), activating time 0.05 s or less, maximum 5 cycles per second, working pressure 0.15-0.8 MPa, proof pressure 1.2 MPa, air filtered to 40 um, IP65 coil housing, 220 g body weight.
No. The DC12V coil draws only 2.5 W, connects through a sealed terminal box rated IP65 (DIN40050), and tolerates -20 to +70 C, so it wires straight to a 12 V battery or low-voltage PLC output. For a drop-in replacement, match the 4V200 body, function 10, 1/4in NPT ports, DC12V voltage code F and terminal entry - all five appear in the code 4V21008FT-W.
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