The AirTAC Airtac 4V Solenoid Valves 4V230E-08BT is a genuine 5/3-way 5/3 double solenoid — exhaust center solenoid valve with 08BT ports and an effective area of 13.6 mm² (Cv 0.8). It is an internally piloted spool valve that directs compressed air to double-acting cylinders and actuators.
The AirTAC 4V230E-08BT is a 5/3-way double-solenoid pneumatic directional valve built on the mid-flow 4V200 body. When both coils are de-energised, the spring-centered spool moves to the exhaust-center position: both cylinder ports A and B are connected to exhaust, allowing the double-acting actuator to float freely. This NPT-threaded model runs on a 3.0 W DC24V coil and is wired through a standard terminal box.
With an effective area of 13.6 mm² (Cv 0.8) and a maximum cycling speed of 3 cycles per second, it suits double-acting cylinders in the ~O32-50 mm range. The valve weighs 360 g, responds in 0.05 s or less, and carries an IP65 protection rating. Its aluminum-alloy body operates reliably from 0.15-0.8 MPa across a -20 to +70 °C temperature band.
| Model | Airtac 4V Solenoid Valves 4V230E-08BT |
|---|---|
| Series | 4V200 solenoid valve (spool type) |
| Valve type | 5/3-way |
| Function | 5/3 double solenoid — Exhaust center |
| Port size | 08BT |
| Exhaust port | 08BT |
| Effective area (Cv) | 13.6 mm² (Cv 0.8) |
| 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 | 360 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 | 13.6 mm² |
|---|---|
| Flow coefficient | Cv 0.8 |
| 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. |
| 3 | Function: 1 = single 5/2, 2 = double 5/2, 3 = 5/3. |
| -08BT | 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.
De-energise both solenoids to exhaust both cylinder ports. The rod floats freely, letting an operator push or pull a fixture into place without fighting trapped air pressure.
Drive a clamp to two distinct positions using the solenoids. At center, the exhaust state releases all clamping force, simplifying part changeover on small assembly pallets.
Operate a diverter gate to two powered positions. In a jam or E-stop, the exhaust center lets an operator manually swing the gate clear without back-pressure resistance.
Choose the 4V230E-08BT when your application needs a double-acting cylinder to go limp at mid-stroke—common in manual-load stations where an operator must push the rod freely. The exhaust-center spool vents both sides of the piston, so no trapped air resists external force. If you need the rod to hold position instead, switch to the closed-center 4V230C variant.
This NPT-thread, DC24V terminal-box model is a drop-in replacement for any 4V200-series 5/3 exhaust-center valve with the same port and voltage. For smaller O20-32 mm cylinders, the 4V100 series (Cv 0.6) reduces over-sizing; for larger O40-63 mm bores or faster strokes, step up to the 4V300 (Cv 1.65). When matching a replacement, confirm all five points: 4V200 body, 5/3 exhaust-center function, 1/4 NPT port, DC24V coil, and terminal-box entry.
Quick checklist
Its 13.6 mm² effective area (Cv 0.8) pairs well with double-acting cylinders roughly O32-50 mm in bore. For a precise match, calculate the required Cv from your cylinder volume, stroke time, and operating pressure.
When neither solenoid is energised, internal springs center the spool and connect both cylinder ports (A and B) to the exhaust port. The actuator rod is unpressurised and can be moved by an external force—ideal for manual positioning, but never use this alone to hold a suspended load.
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