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 AirTAC 4V21008FT-W is a 4V200-series 5/2-way single-solenoid valve with spring return, an NPT 1/4in main port, a DC12V coil (2.5 W) and terminal-box electrical entry. Its -W suffix makes it an external-pilot version: pilot air arrives through a separate external pilot port instead of being tapped internally from the main line, so the spool still shifts dependably in low-pressure or vacuum main circuits. Like every 4V200 valve it directs compressed air to double-acting cylinders and actuators, energise to shift, de-energise and the internal spring returns the spool automatically.
With an effective area of 17 mm2 (Cv 1.0), a switching response of 0.05 s or better and a 220 g aluminium-alloy body, this valve sits in the classic mid-flow class for bores of roughly O32-50 mm. The spool-type design runs on air filtered by a 40 um element, needs no lubrication, operates from 0.15-0.8 MPa and carries an IP65-rated terminal box, and it can be stacked into an integrated manifold group on a common base.
| 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.
The external pilot keeps shifting the spool even when main-line pressure is low or under vacuum, where an internal-pilot valve would fail to actuate.
Spring return gives a defined home position on power loss, cycling pusher cylinders at up to 5 cycles per second with a Cv 1.0 flow path.
Directs air to double-acting clamp and ejector cylinders in the O32-50 mm class, with a 0.05 s response for tight machine takt times.
Size against your cylinder: the Cv 1.0 of this 4V200 body suits O32-50 mm bores and general cycle rates; step down to a 4V100 (Cv 0.6) for a small cylinder, or up to a 4V300 (Cv 1.65) when you need a bigger bore or a faster stroke. Choose this single-solenoid spring-return version when a constant electrical signal is acceptable and the valve must fail back to one position; pick a double-solenoid 5/2 for pulse-signal memory, or a 5/3 (Cv 0.8) when the cylinder must hold, float or pressurise at center.
Because this is the external-pilot -W build, plumb pilot air to the external pilot port rather than relying on an internal main-line tap. For an exact 1:1 replacement match confirm all five points: body size 4V200, function 10 (single solenoid), port and thread (1/4in NPT), coil voltage DC12V, and terminal-box entry - plus the -W external-pilot option itself. One valve with individual wiring or a manifold base both work.
Quick checklist
Its 5/2-way spool with an effective area of 17 mm2 (Cv 1.0) directs compressed air to double-acting cylinders and actuators, best matched to bores of roughly O32-50 mm. Single-acting cylinders need a 3/2 valve, not this 5/2 model. The DC12V coil draws 2.5 W and the valve weighs 220 g.
A standard valve taps its pilot supply internally from the main line, so switching can get sluggish if main pressure drops. The -W build feeds pilot air from a separate external pilot port, keeping the spool shifting reliably in low-pressure or vacuum main circuits. Otherwise it matches the base valve: 5/2 spring return, 1/4in NPT port, DC12V terminal-box coil.
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