AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15)
The AirTAC AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15) is a genuine 5/3-way 5/3 double air pilot — exhaust centre air pilot valve with PT1/2 ports. It is a sliding-spool valve switched by a compressed-air signal instead of a coil, and it directs air to double-acting cylinders and actuators. The 4A400 body is published at 40.0 mm² effective area (Cv 2.35).
- Valve type5/3-way
- ActuationAir pilot
- Port sizePT1/2
- Effective area40.0 mm²
- Flow (Cv)2.35
- Series4A400
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About the AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15)
The AirTAC 4A430E15 is a 5/3-way air pilot valve that directs compressed air to double-acting cylinders and actuators in the Dia 80-125 mm class. There is no coil in it: a short pulse of pilot air at either control port throws the spool, and with both pilot signals removed the centre position exhausts the A and B cylinder ports, so the cylinder can float freely and be moved by hand or by load. Because the centre simply vents rather than blocks, this is the centre to pick when you need to reposition or push a cylinder aside between cycles.
This is the largest valve in the 4A family, built on the 4A400 body with a 1/2 inch PT (Rc tapered) port at inlet, outlet and both exhausts. The 5/3 construction flows through a 40.0 mm2 effective area (Cv 2.35) at up to 3 cycles per second no-load, and the valve itself weighs 735 g in an aluminium-alloy body. Operating range is 0.15-0.8 MPa with 1.2 MPa proof pressure, and the air supply must be filtered to 40 um.
AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15) Technical Specifications
| Model | AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15) |
|---|---|
| Series | 4A400 air pilot valve (sliding-spool type) |
| Valve type | 5/3-way |
| Function | 5/3 double air pilot — Exhaust centre |
| Actuation | Double air pilot, spring-centred (exterior air control) |
| Port size | PT1/2 |
| Exhaust port | PT1/2 |
| Thread standard | PT (Rc tapered) |
| Effective area (Cv) | 40.0 mm² (Cv 2.35) |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 0.8 MPa (21 – 114 psi) |
| Proof pressure | 1.2 MPa (175 psi) |
| Max frequency | 3 cycle/sec (no load) |
| Temperature | -20 to +70 °C |
| Body material | Aluminum alloy |
| Lubrication | Not required |
| Weight | 735 g |
Specifications follow the official AirTAC 4A series datasheet. AirTAC publishes the effective area / Cv published for 4A430C-15; other port and centre options of this body share the same casting but are not separately rated. Max frequency is the no-load figure. Confirm the thread standard (PT / G / NPT) against the product label before piping.
Flow & Piloting
| Effective area | 40.0 mm² |
|---|---|
| Flow coefficient | Cv 2.35 |
| Control signal | Compressed air (exterior pilot) |
| Pilot ports | Two pilot ports, one per side |
| Electrical parts | None — no coil, no wiring, no IP rating needed |
| Manifold base | 400M (up to 8 stations) |
Because there is nothing electrical in the valve, the 4A suits wash-down, explosive-atmosphere and high-vibration areas where a solenoid would need certification. Size the valve so effective area / Cv is not the bottleneck for your bore and speed; the 5/3 centre versions have a smaller effective area than the 5/2 of the same body.
Model Code: AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15)
| 4A | Air pilot valve, sliding-spool, 4-series. |
|---|---|
| 4 | Body size (4A400) — sets port & flow. |
| 30E | Function: 10 = single pilot 5/2, 20 = double pilot 5/2, 30C/E/P = 5/3 closed / exhaust / pressure centre. |
| 15 | Port size: M5 / 06=1/8" / 08=1/4" / 10=3/8" / 15=1/2". |
| (blank) | Thread standard: blank = PT, G = BSPP, T = NPT. This model is PT (Rc tapered). |
Related: 4A410 (single pilot), 4A420 (double pilot, memory), 4A430C/E/P (5/3 centre).
Where the AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15) Is Used
Quarry crusher dust zones
On a stone-crushing or screening plant, a 1/2 inch line at Cv 2.35 can shift a Dia 100 mm tensioner or reject-gate cylinder, and the all-pneumatic 4A430E15 needs no certified electrics in the dust. Between pulses the exhaust centre lets the gate hang free for manual clearing.
Grain elevator and woodworking lines
Flour mill and sawdust environments rule out spark sources, so a signal valve on the machine throws this valve by air alone. The exhaust centre means a Dia 80-125 mm divertor flap on the conveying line can be nudged by hand for jam recovery once both pilot signals are dropped.
Wash-down dock and food transfer equipment
On a wash-down transfer table the 4A430E15 sits right at the machine, driven by a foot or palm signal valve, with nothing electrical to seal. The PT tapered 1/2 inch ports take PTFE-sealed fittings, and at 735 g the body bolts straight onto the frame.
Is the AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15) the Right Valve?
Start your check here: a floating-centre 5/3 at Cv 2.35 is what you need only if the cylinder must go slack between cycles. If the load should hold its position at centre, choose the closed-centre 4A430C15 instead; if both lines should stay pressurised, the pressure-centre 4A430P15 is the match. If you are stepping down, the 4A300 body offers the same functions at Cv 1.65 for Dia 50-100 mm cylinders; this 4A400 body is the top of the range, so there is no larger step up in the series.
The 4-point replacement match must hit all four: body size 4A400, function code 30E, port 15 (1/2 inch) and thread PT. If you prefer parallel-face sealing with a bonded washer, the G-thread version 4A430E15G seals on the flange rather than the flanks. A single valve can be bench-mounted, or several can share a 400M manifold base (up to 8 stations, 1/2 inch common inlet) to cut pipework on multi-cylinder machines.
Quick checklist
- ✓ Required flow (Cv) for cylinder & speed
- ✓ Function: single / double / 5-3 centre
- ✓ Pilot air available at 0.15 MPa or above
- ✓ Port thread (M5 / 1/8 / 1/4 / 3/8 / 1/2)
- ✓ Single valve or 400M manifold base?
Installation & Piloting Notes
- check Use clean air filtered to 40µm or finer.
- check Keep the main line within 0.15 – 0.8 MPa.
- check Drive the pilot port from a 3/2 or 5/2 signal valve.
- check A pulse is enough — the spool stays where it was last driven.
- check Fit silencers or fittings to the exhaust ports.
- check Once run on lubricated air, keep lubricating it.
AirTAC 4A430E-15 Pneumatic Valve, 4A400 Series (4A430E15) FAQ
It is a 5/3-way, double-pilot valve for double-acting cylinders, rated for Dia 80-125 mm bores. Published figures for this 5/3 version: effective area 40.0 mm2, flow capacity Cv 2.35, maximum frequency 3 cycles per second (no-load), operating pressure 0.15-0.8 MPa (21-114 psi) with 1.2 MPa proof pressure, and -20 to +70 C temperature. Air must be filtered to 40 um. At centre both cylinder ports are exhausted, so the actuator floats free.
Switching is entirely by air. Apply a pilot signal to one control port to throw the spool, then pulse the opposite port to send it back; with both signals removed the centre position vents the A and B ports. Because nothing electrical is involved, the valve can be mounted far from a control cabinet on a single signal line, in dusty, wet or vibrating spots where a coil-based valve is a liability. Keep the signal applied or pulsed in sequence - dropping air mid-cycle simply puts the valve in its exhaust centre.
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