Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B
The AirTAC Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B is a genuine 5/2-way solenoid valve solenoid valve with 21008B ports and an effective area of See datasheet (Cv —). It is an internally piloted spool valve that directs compressed air to double-acting cylinders and actuators.
- Valve type5/2-way
- FunctionSolenoid valve
- Port size21008B
- Effective areaSee datasheet
- Flow (Cv)—
- Series4V
About the Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B
The B03-4V21008B is AirTAC's explosion-proof version of the popular 4V210-08B, built for environments where flammable gases, vapors, or dust may be present. As a 5/2-way single solenoid valve, it directs compressed air to one side of a double-acting cylinder while exhausting the other; when the DC24V signal is removed, an internal spring returns the spool to its home position, retracting the actuator. This spring-return behavior makes it a natural fit for fail-safe retraction in clamping, pressing, or positioning tasks where power loss must move the load to a known state.
With an effective area of 17 mm² (Cv 1.0), this valve suits double-acting cylinders in the 32-50 mm range, delivering a balance of flow and compactness for mid-size automation. The DC24V coil draws just 3.0 W, and the valve responds in 0.05 s or less, keeping cycle times tight. The "B03-" prefix marks this as the explosion-proof build of the 4V210-08B; for the exact protection level, certification, and zone suitability, please confirm the details with us before installation.
Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B Technical Specifications
| Model | Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B |
|---|---|
| Series | 4V solenoid valve (spool type) |
| Valve type | 5/2-way |
| Function | Solenoid valve |
| Port size | 21008B |
| Exhaust port | 21008B |
| Effective area (Cv) | See datasheet (Cv —) |
| 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 | See datasheet |
| Response time | ≤ 0.05 s (activating) |
| Temperature | -20 to +70 °C |
| Body material | Aluminum alloy |
| Weight | See datasheet |
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.
Flow & Coil Options
| Effective area | See datasheet |
|---|---|
| Flow coefficient | Cv — |
| Response time | ≤ 0.05 s |
| Coil power | AC 3.5–4.5 VA · DC 2.5–3.0 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.
Model Code: Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B
| 4V | Solenoid valve, spool type, 4-series. |
|---|---|
| B | Body size (4V) — sets port & flow. |
| 0 | Function: 1 = single 5/2, 2 = double 5/2, 3 = 5/3. |
| -21008B | Port thread: M5 / 06=1/8" / 08=1/4" / 10=3/8" / 15=1/2". |
Related: 4VB10 (single), 4VB20 (double), 4VB30C/E/P (5/3 center). Add the voltage suffix when ordering.
Where the Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B Is Used
Automated Clamping Fixtures
Controls double-acting clamps on machining or assembly fixtures. Spring return retracts the clamp on power loss, releasing the workpiece for safe unloading.
Paint Shop Conveyor Stops
Operates cylinder-driven stoppers on paint lines where solvent vapors may be present. The explosion-proof build reduces ignition risk while the 5/2 action positions the stop precisely.
Chemical Dosing Press Actuator
Drives a double-acting cylinder on a small press in a chemical handling area. The Cv 1.0 flow provides responsive movement, and spring return lifts the press when de-energized.
Is the Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B the Right Valve?
Choose the B03-4V21008B when your application demands explosion-proof construction and your cylinder falls in the 32-50 mm bore range. The Cv 1.0 flow capacity handles moderate speeds; if you need faster cycling or a larger bore, step up to the 4V300 series (Cv 1.65). For smaller cylinders under 32 mm, the 4V100 series (Cv 0.6) is lighter and more economical. The single solenoid spring-return design is ideal for applications where a power loss should retract the actuator automatically - if you need to hold the last position without power, consider a double solenoid 5/2 (memory) valve instead.
When replacing an existing valve, verify the five key points: body size (4V200), function (5/2 single), port size and thread (PT 1/4"), coil voltage (DC24V), and electrical entry (terminal box). This SKU uses a terminal box connection; if you need a pre-wired grommet lead, the 4V210-08BI is the equivalent. Always confirm the explosion-proof rating and certification for your specific hazardous area with us before ordering.
Quick checklist
- ✓ Required flow (Cv) for cylinder & speed
- ✓ Function: single / double / 5-3 center
- ✓ Coil voltage (DC24 / AC220 …)
- ✓ Port thread (M5 / 1/8 / 1/4 / 3/8 / 1/2)
- ✓ Single valve or manifold base?
Installation & Wiring Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 0.8 MPa operating pressure.
- check Match coil voltage to your controller output.
- check Use the manual override to test before powering.
- check Fit silencers or fittings to the exhaust ports.
- check Wiring by qualified personnel per AirTAC docs.
Airtac B03-4V Explosion-Proof Solenoid Valve B03-4V21008B FAQ
The B03- prefix marks this as AirTAC's explosion-proof version of the standard 4V210-08B. It is built to reduce the risk of ignition in hazardous atmospheres. We do not have the specific protection level or certification details in our data, so please confirm the exact rating and zone suitability with us before installation.
Yes, it is a 5/2-way valve designed specifically for double-acting cylinders. It pressurizes one port while exhausting the other, and the spring return moves the spool back when the DC24V signal is removed. For a 32-50 mm cylinder, the Cv 1.0 flow is well matched.
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