The AirTAC Airtac 4V Solenoid Valves 4V21006C-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 AirTAC 4V21006C-W is a 5/2-way single-solenoid poppet-spool valve from the 4V200 family, built to direct compressed air to double-acting cylinders and actuators on 1/8-inch PT ports. Energise the coil and the spool shifts to extend the actuator; de-energise and the internal spring returns the spool, so the valve needs a constant electrical signal to hold the extended stroke. The -W suffix marks the external-pilot build: pilot air enters through a dedicated external port instead of being tapped from the main line, which keeps switching dependable on low-pressure mains and on vacuum circuits where an internal pilot would starve.
With a 17 mm2 effective area (Cv 1.0) this 1/8-inch model comfortably serves ~O32-50 mm double-acting cylinders at cycle rates up to 5 per second, and the spool reacts in 0.05 s or less. The AC110V coil draws just 4.5 VA through the standard terminal box, the aluminium body weighs about 220 g, and the valve carries IP65 (DIN40050) protection, a 40 um filtration requirement, and a 0.15-0.8 MPa working range - no lubrication needed.
| Model | Airtac 4V Solenoid Valves 4V21006C-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.
On ejector pick-and-place rigs or lines running well below 0.4 MPa, the external pilot port keeps the spool shifting positively while an internally piloted valve would hesitate or fail to actuate.
Spring return guarantees a small double-acting clamp or press cylinder backs off the instant the 110 V signal is cut - useful where losing power must release the workpiece, with a check valve added where the load itself must be held.
A Cv 1.0 flow path and sub-0.05 s response cycle pusher cylinders on packaging and sorting conveyors quickly, while the terminal box wires cleanly into a machine-side 110 V control panel.
Pick this 4V21006C-W when your mains pressure is weak or your circuit runs under vacuum - the external pilot lets it shift where an internally piloted 4V210-06 would stick. If your cylinder is under ~O32 mm and Cv 0.6 is enough, the smaller 4V100 saves space and air; for bores above ~O50 mm or faster cycling, step up to the 4V300 with Cv 1.65. Choose function 10 (this valve) for momentary or spring-back duty, function 20 if the actuator must hold its last position through a power cut, or a 4V230 5/3 version for a defined center state. A single valve mounts directly; add a manifold base when several stations share one supply. For a like-for-like replacement, match all five points: 4V200 body, function 10, 1/8" port with PT thread, AC110V coil, and terminal entry - plus the external-pilot -W option.
Quick checklist
Its 17 mm2 effective area (Cv 1.0) suits ~O32-50 mm double-acting cylinders at up to 5 cycles per second. It is a 5/2 valve, so it pressurises one cylinder chamber while venting the other - it is not for single-acting cylinders. Below ~O32 mm the 4V100 (Cv 0.6) is usually the better match.
A standard valve borrows its pilot air from the main supply, so it can refuse to shift when line pressure is low or on a vacuum circuit. The -W variant feeds the pilot from a separate external port, keeping operation reliable under those conditions. Otherwise the specification is identical: AC110V 4.5 VA coil, terminal box, PT 1/8" ports, and spring-return 5/2 function.
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