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 AirTAC 4V21008F-W is a 5/2-way single-solenoid valve with a 1/4" PT-threaded port and a DC12V coil drawing just 2.5 W - a low-voltage configuration well suited to battery-fed or mobile DC control circuits. Energising the solenoid shifts the spool to one position; when the coil is de-energised an internal spring returns it, so the valve requires a maintained electrical signal rather than a pulse. The -W suffix marks the external-pilot version: pilot air is supplied through a separate external pilot port instead of being tapped from the main line, which keeps switching dependable on low-pressure or vacuum service where an internally piloted valve would fail to shift.
Belonging to the 4V200 mid-body class, it offers an effective area of 17.0 mm2 (Cv 1.0) and responds in 0.05 s or less, comfortably driving double-acting cylinders and actuators in the ~O32-50 mm bore range. The valve weighs 220 g, mounts on a base or manifold group, carries an IP65 terminal-box entry and needs no lubrication. Every unit ships as genuine AirTAC stock, ready to quote.
| 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.
The 12 VDC, 2.5 W coil runs straight from vehicle or battery supplies, making this valve a natural fit for truck-mounted, trailer and other mobile pneumatic actuators where no mains supply exists.
Because pilot air is fed externally, the spool still shifts fully on main lines running near vacuum or at reduced pressure - ideal for ejectors, stops and pushers on gentle-handling conveyor systems.
Single-solenoid spring return guarantees the double-acting clamp or gripper retreats the instant the control signal drops, a fail-position behaviour many assembly fixtures are built around.
Choose the 4V200 body when a 4V100 (Cv 0.6) is undersized for your bore but a 4V300 (Cv 1.65) would be overkill; this class sits squarely between them. Within it, pick the single solenoid (this model) when the actuator should always spring back on signal loss, a double solenoid (4V220) when the position must be remembered, or a 5/3 version (4V230C/E/P) when a held, floated or pressurised mid-position is needed - note the 5/3 options drop to 13.6 mm2 / Cv 0.8. One valve on its own body or several on a manifold base both work. For a like-for-like replacement, match all five points: 4V200 body, function 10, 1/4" port in PT thread, DC12V coil, terminal entry - plus the external-pilot -W option.
Quick checklist
It directs compressed air to double-acting cylinders and actuators, sized for ~O32-50 mm bores with a 17.0 mm2 effective area (Cv 1.0). The external-pilot -W design feeds pilot air from its own port, so the valve switches reliably even when main-line pressure is low or under vacuum - conditions that can leave an internally piloted valve stuck.
This is a spring-return 5/2 valve: while the DC12V coil stays energised the spool holds one position, and the moment the signal is removed the spring shifts it back. The controlled cylinder therefore always returns to a defined side - a maintained signal, not a short pulse, is required. For a valve that remembers its last pulsed state instead, use the double-solenoid 4V220.
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