The AirTAC Airtac 4V Solenoid Valves 4V21006E-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 4V21006E-W is a single-solenoid 5/2-way directional valve with an externally piloted spool. Energise the AC24V coil and the valve directs supply air to one side of a double-acting cylinder while venting the other; de-energise it and the internal spring returns the spool, reversing the stroke. Because it is a spring-return valve, the solenoid signal must stay on to hold the extended position. What sets the -W variant apart is the pilot supply: instead of tapping air from the main inlet, pilot pressure arrives through a separate external port, so switching stays dependable on low-pressure mains, vacuum circuits or lines where internal pilot feed would be marginal.
Flow sits in the 4V200 mid class at 17.0 mm2 effective area (Cv 1.0), with a maximum switching rate of 5 cycles per second and a response time of 0.05 s or less. The AC24V terminal-box coil draws 5.0VA, the PT-threaded body has a 1/8in inlet/outlet/exhaust, and the whole valve weighs 220 g. It is a natural match for double-acting cylinders in roughly the O32-50 mm bore range.
| Model | Airtac 4V Solenoid Valves 4V21006E-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.
External pilot feed keeps the spool switching crisply on lines where an internally piloted valve would stall, making this variant a go-to for vacuum-assisted handling and low-pressure process air.
A spring-return 5/2 valve paired with a double-acting cylinder gives predictable retract-on-signal-loss behavior for pick-and-place, press-fit and screwdriving heads in the O32-50 mm class.
Cv 1.0 flow and a sub-0.05 s response let this valve cycle small pusher and gate cylinders at up to 5 cycles per second on packaging and sorting lines.
Choose this model when your line pressure can dip or run below normal pilot-feeding levels - vacuum conveyors, low-pressure handling and soft-start circuits all benefit from the external pilot. If your cylinder is a compact O20 or smaller bore, the 4V100 (Cv 0.6) is usually the more economical fit; for bores above O50 or faster cycle demands, step up to the 4V300 (Cv 1.65). If you would rather have the valve remember its last position without a held signal, pick the double-solenoid 4V220 instead of this spring-return version.
For a like-for-like replacement, match five points: body size (4V200), function (single solenoid 5/2, code 10), port and thread (1/8in PT), coil voltage (AC24V) and electrical entry (terminal box). Single valves mount directly, or several can share a manifold base for a tidier panel.
Quick checklist
It is a 5/2-way valve rated at 17.0 mm2 effective area (Cv 1.0), sized for double-acting cylinders around O32-50 mm bore at up to 5 cycles per second. The -W external-pilot option means the pilot spool is fed from its own port rather than from the main supply, so the valve switches reliably even when main-line pressure is low or the circuit runs under vacuum. Operating pressure is 0.15-0.8 MPa, filtered by a 40 um element.
This is a single-solenoid, spring-return valve: while energised the cylinder stays on the working stroke, and the moment power is removed the spring shifts the spool back and reverses the cylinder. The coil is AC24V at 5.0VA, wired through a terminal box (IP65, insulation class B), and a manual override on the body lets you actuate the valve by hand for setup or troubleshooting.
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