The AirTAC Airtac 4V Solenoid Valves 4V21008CG-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 4V21008CG-W is a 5/2 single-solenoid directional valve built on the 4V200 body, sized to switch compressed air between the two sides of double-acting cylinders and pneumatic actuators. Energise the AC110V coil and the spool shifts to the working position; de-energise it and an internal spring snaps the spool home, so a constant electrical signal is required to hold the advanced stroke. This exact SKU pairs a 1/4in BSPP parallel (G) port with a screw-terminal box suited to fixed conduit wiring. With an effective area of 17.0 mm2 (Cv 1.0) it sits in the mid-flow class that suits ~Dia32-50 mm bores, responding in 0.05 s or less at up to 5 cycles per second. The coil draws 4.5 VA at AC110V and the aluminium-alloy body weighs 220 g. Supply air filtered by a 40 um element; lubrication is not required.
| Model | Airtac 4V Solenoid Valves 4V21008CG-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.
A five-station bottle-capping machine indexing a Dia40 mm rotary actuator: that bore yields roughly 64 kgf of drive at 0.5 MPa, comfortably inside the Cv 1.0 flow class, and the <= 0.05 s response keeps index timing tight.
On a case-packing line, a Dia50 mm pusher cylinder folds top flaps before sealing; the 5 cycle/s maximum frequency tracks the pack pitch while the spring return retracts the pusher the moment the PLC output drops.
A small assembly cell clamps aluminium brackets before riveting using a Dia32 mm swing clamp (about 41 kgf at 0.5 MPa); the 1/4in BSPP parallel port suits standard parallel-thread fittings on fixture manifolds.
Step down to the 4V100 body (Cv 0.6) when the load is a small Dia32 mm bore pushing roughly 41 kgf at 0.5 MPa and cycle speed is modest. Step up to the 4V300 body (Cv 1.65) if you run a Dia50 mm cylinder producing about 100 kgf at 0.5 MPa or need faster extension. Because this is a spring-return valve, choose the double-solenoid 4V220 instead when the actuator must stay put on power loss; that spool holds its last pulsed position by land friction and balanced pressure, with no magnet involved. A single valve mounts inline, or several can share an integrated manifold base. Ordering a replacement? Match five points: the 4V200 body size, the function digit 10 (single solenoid, spring return), the 1/4in port with G (BSPP parallel) thread, the C coil code for AC110V, and the terminal-box entry rather than a grommet lead.
Quick checklist
Effective area 17.0 mm2 (Cv 1.0), response time 0.05 s or less, working pressure 0.15-0.8 MPa with a 1.2 MPa proof pressure, maximum 5 cycles per second, IP65 (DIN40050) protection, class B insulation, AC110V coil drawing 4.5 VA, aluminium body weighing 220 g, air filtered by a 40 um element, no lubrication needed, and a manual override available in locking or non-locking form.
That is the spring return working as designed: a single-solenoid valve holds the switched position only while the AC110V coil stays energised. If the stroke must persist through a power cut or PLC scan pause, latch the output in your program or move to the double-solenoid 4V220, which keeps its last position through spool friction and balanced pressures - not through any magnetic latch. When replacing, also match the 1/4in G thread and the terminal-box entry.
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