The AirTAC Airtac 4V Solenoid Valves 4V330E08FT is a genuine 5/3-way 5/3 double solenoid — exhaust center solenoid valve with 330E08FT ports and an effective area of 21.3 mm² (Cv 1.25). It is an internally piloted spool valve that directs compressed air to double-acting cylinders and actuators.
The 4V330E08FT is a 5/3-way double-solenoid valve with an exhaust center, built on the AirTAC 4V300 aluminium body. Its DC12V coil draws only 2.5 W, which makes it a natural fit for battery-powered carts, mobile robots and low-voltage control panels where a 24 V supply is not available. Ports are NPT 1/4in tapered, the standard thread for North American manifold plates and fittings. At center, both cylinder ports A and B vent to exhaust, so a double-acting cylinder connected to this valve floats free and can be repositioned by hand or by an external force. Flow sits at 21.3 mm2 effective area (Cv 1.25) with a 3 cycle/sec maximum frequency, response time is 0.05 s or better, and the valve weighs 450 g. It suits approximately Dia50-80 mm bores.
| Model | Airtac 4V Solenoid Valves 4V330E08FT |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/3-way |
| Function | 5/3 double solenoid — Exhaust center |
| Port size | 330E08FT |
| Exhaust port | 330E08FT |
| Effective area (Cv) | 21.3 mm² (Cv 1.25) |
| 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 | 3 cycle/sec |
| Response time | ≤ 0.05 s (activating) |
| Temperature | -20 to +70 °C |
| Body material | Aluminum alloy |
| Weight | 450 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 | 21.3 mm² |
|---|---|
| Flow coefficient | Cv 1.25 |
| 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. |
| 3 | Function: 1 = single 5/2, 2 = double 5/2, 3 = 5/3. |
| -330E08FT | 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.
A Dia63 pusher cylinder (about 155 kgf at 0.5 MPa) driving a carton stopper can be de-energized to center, letting line operators slide the gate aside by hand during jam clearing instead of cracking fittings.
The 2.5 W DC12V coil runs straight off a battery bus, and the float position lets an end-of-arm gripper slide be repositioned manually during SKU changeover without bleeding the circuit down.
On a clamp slide where an operator must tweak part seating mid-setup, de-energizing both solenoids vents the Dia50-80 mm cylinder (Cv 1.25 flow) so the tooling floats instead of locking mid-stroke.
Size around the Cv 1.25 figure. If your bore is Dia40 or below, a 4V200 body at Cv 1.0 is the leaner choice; a Dia50 cylinder needs roughly 98 kgf push at 0.5 MPa and is comfortably served by either body. For Dia63 and Dia80 bores (about 155 kgf and 251 kgf push at 0.5 MPa respectively), stay on the 4V300, and move to a 4V400 at Cv 2.82 only when you exceed Dia80 or need faster cycling. Choose the exhaust center over the closed (30C) or pressure (30P) variant when you want the actuator to drift free at mid position - for manual jog or easy repositioning. To replace an existing unit, match five things: 4V300 body, function 30E, 1/4in port with NPT thread, DC12V coil, and terminal-box entry. A manifold base is available if you later want a valve group.
Quick checklist
It is a 5/3 exhaust-center double-solenoid valve with 21.3 mm2 effective area (Cv 1.25) and a maximum frequency of 3 cycles/sec. Activating response is 0.05 s or less, working pressure is 0.15-0.8 MPa with 1.2 MPa proof pressure, the DC12V coil consumes 2.5 W, and the valve weighs 450 g. Air must be filtered to 40 um and lubrication is not required.
When neither solenoid is energized, ports A and B both connect to exhaust, so the cylinder is unpressurized and free to move. That is ideal for manual jog and repositioning, but it is not a brake: a suspended or falling load will drift. Where guaranteed load holding is required, add a pilot-operated check valve at the cylinder ports or a mechanical brake - the valve alone cannot provide it.
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