The AirTAC Airtac 4V Solenoid Valves 4V330C08BG is a genuine 5/3-way 5/3 double solenoid — closed center solenoid valve with 330C08BG 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 AirTAC 4V330C-08BG is a 5/3-way double solenoid valve with a closed center, built on the mid-size 4V300 body. Both solenoids pulse the spool; at center every port is blocked, so a double-acting cylinder sits still with pressure trapped on both sides. This version is fully specified for DC24V control, a terminal-box entry and G (BSPP parallel) 1/4in ports - worth flagging because many PLC output cards prefer the 3.0 W DC coil over an AC type, and the parallel G thread seals on a bonded washer rather than tape. Flow sits in the Cv 1.25 (21.3 mm2) class, sized for roughly Dia50-80 mm bores, with a maximum cycling rate of 3 cycles per second and an activating time of 0.05 s or less. One practical point: because the hold at center relies on the balanced spool simply staying put, any drift over long dwell periods comes from internal spool leakage, not from the coil - no holding current is drawn while the cylinder is parked. The 450 g aluminum body accepts a locking or non-locking manual override and stacks onto a manifold base.
| Model | Airtac 4V Solenoid Valves 4V330C08BG |
|---|---|
| Series | 4V300 solenoid valve (spool type) |
| Valve type | 5/3-way |
| Function | 5/3 double solenoid — Closed center |
| Port size | 330C08BG |
| Exhaust port | 330C08BG |
| 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. |
| -330C08BG | 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 mm swing clamp fed by this valve stops mid-stroke when both solenoids drop, holding clamp position between machining cycles; the 21.3 mm2 orifice gives crisp clamp-and-cut timing at up to 3 cycles per second.
Cv 1.25 delivers enough flow to keep a Dia80 mm punching cylinder productive through its 0.15-0.8 MPa working band, while the closed center parks the ram safely between strokes.
The DC24V coil (3.0 W) interfaces directly with 24 V PLC sinking or sourcing outputs via the terminal box, letting the controller stop a Dia50 mm lift pallet at an intermediate position without a mid-position sensor.
Check the flow budget both ways before ordering. A 4V330C is oversized for bores under Dia50 - the 4V200 body with Cv 1.0 will cycle a Dia40 cylinder just as fast at lower cost. Above Dia80 the 21.3 mm2 orifice starts to throttle retract speed; move up to the 4V400 family at Cv 2.82. Between the two 5/2 versions (single or double solenoid, Cv 1.65) and this 5/3, the deciding question is whether the actuator must stop mid-stroke: only a center-condition valve can do that. Match a replacement on all five points: 4V300 body size, function code 30C (closed center), 1/4in port with G thread, DC24V coil, and terminal entry. If your old valve had molded flying leads instead of a terminal box, that is the I suffix - the wiring will not match.
Quick checklist
Effective area 21.3 mm2 (Cv 1.25), maximum frequency 3 cycles per second, activating time 0.05 s or less, operating pressure 0.15-0.8 MPa with a 1.2 MPa proof pressure, temperature range -20 to +70 C, DC24V coil at 3.0 W, IP65 protection, 450 g weight. All 1/4in ports are G (BSPP parallel) and the air must be filtered by a 40 um element; lubrication is not required.
It parks a double-acting cylinder by blocking all five ports, but the hold is not a certified brake - internal spool leakage allows slow drift under sustained load. For hanging or fall-risk loads, fit pilot-operated check valves at the cylinder ports or a mechanical brake alongside the valve; never rely on the center condition alone.
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