The AirTAC Airtac 4V Solenoid Valves 4V430C15BT is a genuine 5/3-way 5/3 double solenoid — closed center solenoid valve with 430C15BT ports and an effective area of 40.0 mm² (Cv 2.35). It is an internally piloted spool valve that directs compressed air to double-acting cylinders and actuators.
The AirTAC 4V430C-15BT is a 5/3-way closed-center, double-solenoid valve wired for a DC24V supply through a standard terminal box, with its 1/2 inch ports machined as NPT (NPT 1/2) tapered threads for North American piping. In the center position every port is blocked, so a double-acting cylinder stands still exactly where it was when both solenoids dropped - the actuator neither creeps nor drifts while air is trapped on both sides. Flow sits in the top 4V class: 40.0 mm2 effective area, Cv 2.35, with a maximum cycling rate of 3 cycles per second and a response time of 0.05 s or less on each shift. The body is aluminum alloy, weighs 770 g, takes filtered air from 0.15-0.8 MPa, and the 3.0 W DC24V coil keeps control-cabinet loading low. Sizing-wise it pairs well with double-acting cylinders of roughly Dia80-125 mm bore on presses, heavy clamps and lift rigs.
| Model | Airtac 4V Solenoid Valves 4V430C15BT |
|---|---|
| Series | 4V400 solenoid valve (spool type) |
| Valve type | 5/3-way |
| Function | 5/3 double solenoid — Closed center |
| Port size | 430C15BT |
| Exhaust port | 430C15BT |
| Effective area (Cv) | 40.0 mm² (Cv 2.35) |
| 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 | 770 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 | 40.0 mm² |
|---|---|
| Flow coefficient | Cv 2.35 |
| 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. |
|---|---|
| 4 | Body size (4V400) — sets port & flow. |
| 3 | Function: 1 = single 5/2, 2 = double 5/2, 3 = 5/3. |
| -430C15BT | Port thread: M5 / 06=1/8" / 08=1/4" / 10=3/8" / 15=1/2". |
Related: 4V410 (single), 4V420 (double), 4V430C/E/P (5/3 center). Add the voltage suffix when ordering.
On a horizontal machining center, Dia100 mm clamp cylinders holding pallets and fixtures stay locked at center position because the 30C spool blocks all ports - no air bleed means no clamp force decay between cycles.
A bench-mounted 20 kN air press with a Dia125 mm bore cylinder benefits from the Cv 2.35 flow class and the closed center: release the E-stop mid-stroke and the ram halts in place instead of falling or retracting.
Light-duty scissor and tail-lift platforms using Dia80-100 mm pneumatic cylinders park reliably at center, since blocked A and B ports trap air under the load; for certified suspended-load holding add pilot-operated check valves at the cylinder ports.
Size both directions before ordering. If your cylinder is Dia63 mm or smaller, the 4V300 body (Cv 1.65) costs less and cycles it adequately; the 4V400 at Cv 2.35 is only paying off once bore and speed demand it. Upward, the 4V400 is already the largest 4V body - for flow beyond Cv 2.35 move to a bigger AirTAC valve series, or gang two valves on a manifold base and feed separate cylinder ports. Pick the 30C closed center (this model) when the load must freeze in place at center; choose 30E if the cylinder should float freely, or 30P if both chambers should stay pressurized. For a like-for-like replacement, match all five points: body 4V400, function 30C, 1/2 inch NPT thread, DC24V coil, terminal-box entry. Missing any one gives you a valve that fits the manifold but not the machine.
Quick checklist
Flow: 40.0 mm2 effective area, Cv 2.35 (the 5/3 spool trims this below the 48.0 mm2 / Cv 2.82 of the 4V410 and 4V420 5/2 versions). Response time: 0.05 s or below per shift, maximum 3 cycles per second. Pressure: 0.15-0.8 MPa working, 1.2 MPa proof. Coil: DC24V at 3.0 W, terminal-box entry, IP65 (DIN40050), insulation class B, weight 770 g, temperature range -20 to +70 C.
All five ports are blocked: supply, both cylinder ports and both exhausts are sealed. A double-acting cylinder connected to ports A and B is therefore hydraulically (pneumatically) locked at its last position - it neither drifts with the load nor vents to atmosphere. This is a position-hold feature, not a certified safety brake; for suspended or person-critical loads, back the valve up with pilot-operated check valves or a mechanical lock.
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