The AirTAC Airtac 4V Solenoid Valves 4V32008BT-W is a genuine 5/2-way double solenoid (memory) solenoid valve with W ports and an effective area of 28.0 mm² (Cv 1.65). It is an internally piloted spool valve that directs compressed air to double-acting cylinders and actuators.
The AirTAC 4V32008BT-W is a 5/2-way double solenoid directional valve in the 4V300 body class, with 1/4in NPT ports and a DC24V coil drawing just 3.0 W. With an effective area of 28 mm2 (Cv 1.65), it directs compressed air to double-acting cylinders and actuators in the ~O50-80 mm bore range. The -W suffix marks the external-pilot version: pilot air arrives through a dedicated external pilot port rather than being tapped internally from the main line, so the spool keeps shifting dependably even on low main-line pressure or in low-pressure and vacuum circuits.
As a double-solenoid (memory) valve, the spool stays in whatever position it was last pulsed to - held by land friction and balanced pressure, with no spring acting on it and no holding current drawn. Note that this is not a magnetically latched design, and the memory position alone is not a substitute for a mechanical brake or pilot-operated check valves where guaranteed load holding is required. A stainless response time of 0.05 s or below and a 4 cycle/s max frequency suit fast machine cycles; the aluminum body weighs 400 g.
| Model | Airtac 4V Solenoid Valves 4V32008BT-W |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Double solenoid (memory) |
| Port size | W |
| Exhaust port | W |
| Effective area (Cv) | 28.0 mm² (Cv 1.65) |
| 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 | 4 cycle/sec |
| Response time | ≤ 0.05 s (activating) |
| Temperature | -20 to +70 °C |
| Body material | Aluminum alloy |
| Weight | 400 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 | 28.0 mm² |
|---|---|
| Flow coefficient | Cv 1.65 |
| 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. |
|---|---|
| 3 | Body size (4V300) — sets port & flow. |
| 2 | 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: 4V310 (single), 4V320 (double), 4V330C/E/P (5/3 center). Add the voltage suffix when ordering.
External pilot supply keeps the spool switching reliably on machines running reduced main-line pressure, where an internally piloted valve could fail to shift.
Cv 1.65 flow drives double-acting cylinders on pushers, lifts and diverters in the ~O50-80 mm bore class at up to 4 cycles per second.
Double-solenoid memory holds the last commanded state through power loss on clamping and indexing stations - add pilot-operated check valves where positive load holding matters.
Sizing guide: step down to the 4V200 (Cv 1.0) for cylinders under ~O50 mm, and move up to the 4V400 (Cv 2.82) for larger bores or higher-speed travel. Choose this function 20 double solenoid when the actuator should keep its last commanded state through a power cut; pick a single-solenoid 4V310 if the valve must spring back to rest when the signal drops, or a 4V330C/E/P 5/3 if you need a mid-position (hold, float or pressurize). For several valves side by side, mount any 4V300 on a common base to build an integrated manifold group.
Reordering a drop-in spare? Match all five points: 4V300 body size, function (20 = double solenoid memory), 1/4in NPT port thread, DC24V coil, terminal-box entry - plus the -W external-pilot feature, since a standard internally piloted 4V320-08BT is not a like-for-like swap in low-pressure service.
Quick checklist
It has a 28 mm2 effective area (Cv 1.65), so it comfortably feeds double-acting cylinders and actuators in the ~O50-80 mm bore range. The -W external-pilot option feeds pilot air from a separate port instead of the main line, which keeps switching dependable when main pressure runs low or in low-pressure and vacuum circuits. AirTAC does not publish a specific minimum pilot-pressure figure for this model.
The spool simply remains where it was last pulsed - held by land friction and balanced pressure, with no spring and no holding current - so the actuator keeps its last state rather than returning. This is a memory function, not magnetic latching, and it is not a stand-alone safety brake; use a mechanical brake or pilot-operated check valves at the cylinder ports for guaranteed holding of suspended loads.
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