Airtac 3V2 Solenoid Valve 3V208NOBI
The AirTAC Airtac 3V2 Solenoid Valve 3V208NOBI is a genuine 3-port 2-position (3/2) solenoid valve with 1/4 in ports. It either feeds its outlet or vents it to exhaust, which is what makes it the valve for single-acting cylinders, on/off air blow, clamping, vacuum switching and pilot duty.
- Valve type3/2-way (3-port, 2-position)
- Initial stateNormally open
- Port size1/4 in
- Coil voltageDC24V
- Electrical entryFlying lead (lead-out wire type)
- Flow (Cv)0.19
- Series3V2
About the Airtac 3V2 Solenoid Valve 3V208NOBI
The 3V208NOBI is the normally open 1/4in 3V2 body with the coil pre-wired as a flying lead instead of a DIN socket, so the electrician lands the lead-out wires directly on the control terminals - no separate plug to buy or seat. Three ports, two states: air passes from inlet to outlet at rest, and energising the solenoid closes the path while venting the outlet to exhaust. Spring return makes the open state the safe default.
Direct-acting coaxial poppet construction seals from 0 to 0.8 MPa and needs no pilot pressure to operate. Each port flows Cv 0.19 (3.4 mm2 effective area), the DC24V coil draws 7.0 W, and the valve is rated down to -102.2 kPa for vacuum service. Air must be filtered to 40 um or finer; no lubrication is needed.
Airtac 3V2 Solenoid Valve 3V208NOBI Technical Specifications
| Model | Airtac 3V2 Solenoid Valve 3V208NOBI |
|---|---|
| Series | 3V2 |
| Valve type | 3/2-way (3-port, 2-position) |
| Function | Direct-acting, single solenoid, spring return |
| Initial state | Normally open |
| Port size | 1/4 in |
| Thread | PT |
| Coil voltage | DC24V |
|---|---|
| Electrical entry | Flying lead (lead-out wire type) |
| Coil power | 7.0 W |
| Operating pressure | 0-0.8 MPa (0-114 psi) |
| Vacuum service | Rated -102.2 kPa to 0.1 MPa |
| Flow coefficient | Cv 0.19 (3.4 mm2 effective area) |
| Temperature | -20 to 70 C |
| Construction | Coaxial shut-off (poppet), direct-acting, spring return |
| Protection | IP65 (DIN 40050) |
| Medium | Air, filtered by a 40 µm or finer element. Lubrication not required. |
Figures follow the official AirTAC 3V2 catalogue. Confirm coil voltage and thread (PT / NPT / G) against the product label before wiring.
Model Code: Airtac 3V2 Solenoid Valve 3V208NOBI
| 3V2 | Body — sets the flow, the coil power and whether vacuum is rated. |
|---|---|
| 1/4 in | Port size. M5, 06 = 1/8 in, 08 = 1/4 in, 10 = 3/8 in. |
| NO | Normally open: air passes until the coil is energised. |
| DC24V | Coil voltage. A = AC220V, B = DC24V, C = AC110V, E = AC24V, F = DC12V. |
| I | Electrical entry: I = flying lead, otherwise a DIN plug. |
| PT | Port thread. PT ships from stock; G and NPT are available to order. |
What a 3/2 Valve Does
A 3/2 valve has three ports — supply, outlet and exhaust — and two states. It either feeds the outlet or vents it to exhaust, and that is the whole job.
That makes it the right valve for a single-acting (spring-return) cylinder, on/off air blow, a clamp, switching a vacuum generator or suction cup, and piloting a larger valve.
It cannot run a double-acting cylinder. A double-acting cylinder needs air alternately on two sides, which takes a 5-port valve — the AirTAC 4V series.
Where the Airtac 3V2 Solenoid Valve 3V208NOBI Is Used
Vial pick-and-place
A pharmaceutical line lifts glass vials with vacuum cups; the NO valve keeps the vacuum line connected at rest and breaks it only when the coil is energised, releasing each vial on command.
Conveyor stopper gate
A pneumatic stopper on a packaging conveyor sits raised across the lane whenever controls are off, because the normally open state keeps the cylinder fed; energising the DC24V coil vents it so the lane clears.
Dust-collection blast gate
In a small woodworking cell each machine branch keeps its blast gate open at rest through this valve, and switching the coil closes that one branch while the others keep drawing.
Is the Airtac 3V2 Solenoid Valve 3V208NOBI the Right Part?
Confirm five things against this code: PT1/4 port (G or NPT threads are catalogue options to order), normally open state, DC24V coil, flying-lead entry rather than DIN, and any vacuum in the duty. If current draw is the constraint, the 3V1 with its 3.0 W DC24V coil handles smaller duties; if you need many stations packed on one base, the 3V2M manifold version trades flow for density at around Cv 0.1. When the line needs a real jump in flow, the 3V3 at Cv 0.62 is the step that matters - the 1/8in to 1/4in step inside the 3V2 family barely moves the figure. For a double-acting cylinder you need a 5-port valve from the AirTAC 4V series, not this 3/2.
Confirm before you order
- ✓ Port size and thread (PT from stock; G / NPT to order)
- ✓ Initial state — NC or NO, ordered up front
- ✓ Coil voltage matches your controller output
- ✓ Electrical entry — DIN plug or flying lead
- ✓ Single valve, bare base, or complete assembly
- ✓ Single-acting duty, not double-acting
Installation & Wiring Notes
- check Use clean air filtered to 40µm or finer.
- check Stay within 0-0.8 MPa (0-114 psi) operating pressure.
- check Match the coil voltage to your controller output.
- check Use the manual override to test before powering up.
- check Leave the exhaust port clear, or fit a silencer.
- check Wiring by qualified personnel, per AirTAC documentation.
Airtac 3V2 Solenoid Valve 3V208NOBI FAQ
Yes. The 1/8in 3V206 body flows 3.2 mm2 / Cv 0.18 per port and the 1/4in 3V208 body flows 3.4 mm2 / Cv 0.19; these are flow coefficients, not flow rates. Operating pressure is 0-0.8 MPa with a vacuum rating of -102.2 kPa to 0.1 MPa. Temperature window: -20 to 70 C. Coil consumption: 7 VA (AC) or 7.0 W (DC). Ingress protection: IP65 (DIN 40050).
Any single line that needs feeding or venting: single-acting spring-return cylinders, clamps, air-blow and purge jets, vacuum lines and the pilot stage of a larger valve. It cannot run a double-acting cylinder - that needs pressurise and vent handled simultaneously, which is the job of a 5-port valve such as the AirTAC 4V series.
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