AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008)
The AirTAC AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008) is a genuine 5/2-way single air pilot (spring return) air pilot valve with PT1/4 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 4A300 body is published at 28.0 mm² effective area (Cv 1.65).
- Valve type5/2-way
- ActuationAir pilot
- Port sizePT1/4
- Effective area28.0 mm²
- Flow (Cv)1.65
- Series4A300
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008)
The 4A31008 is a 5/2 air pilot valve that directs compressed air to double-acting cylinders and actuators. It is switched by a compressed-air signal line from a manual, mechanical or 3/2 signal valve - there is no coil anywhere on the valve. While the pilot signal is applied the spool holds one position; when the signal is released the internal spring returns the spool, reversing the cylinder. That spring return makes it the natural choice wherever the cylinder must always go home when the signal drops.
This 1/4in PT (Rc tapered) version seals on the thread flanks, so a few wraps of PTFE tape is all the sealing it needs - handy for legacy British-taper pipework. The 4A300 body publishes an effective area of 28.0 mm2 (Cv 1.65) in the 5/2 configuration and suits cylinders of roughly Dia 50-80 mm. Air reaching the valve must pass a 40 um filter element, and the 275 g aluminium body runs on 0.15-0.8 MPa with no lubrication required.
AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008) Technical Specifications
| Model | AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008) |
|---|---|
| Series | 4A300 air pilot valve (sliding-spool type) |
| Valve type | 5/2-way |
| Function | Single air pilot (spring return) |
| Actuation | Single air pilot, spring return (exterior air control) |
| Port size | PT1/4 |
| Exhaust port | PT1/4 |
| Thread standard | PT (Rc tapered) |
| Effective area (Cv) | 28.0 mm² (Cv 1.65) |
| 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 | 4 cycle/sec (no load) |
| Temperature | -20 to +70 °C |
| Body material | Aluminum alloy |
| Lubrication | Not required |
| Weight | 275 g |
Specifications follow the official AirTAC 4A series datasheet. AirTAC publishes the effective area / Cv published for the 3/8" port; 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 | 28.0 mm² |
|---|---|
| Flow coefficient | Cv 1.65 |
| Control signal | Compressed air (exterior pilot) |
| Pilot ports | One pilot port; spring returns the spool |
| Electrical parts | None — no coil, no wiring, no IP rating needed |
| Manifold base | 300M (up to 12 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 4A310-08 Pneumatic Valve, 4A300 Series (4A31008)
| 4A | Air pilot valve, sliding-spool, 4-series. |
|---|---|
| 3 | Body size (4A300) — sets port & flow. |
| 10 | Function: 10 = single pilot 5/2, 20 = double pilot 5/2, 30C/E/P = 5/3 closed / exhaust / pressure centre. |
| 08 | 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: 4A310 (single pilot), 4A320 (double pilot, memory), 4A330C/E/P (5/3 centre).
Where the AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008) Is Used
Spray-booth fixture clamps
Paint and powder-coating booths are hostile territory for solenoid coils. A hand or foot signal valve holds the pilot line on the 4A31008 while it clamps a jig with a Dia 50-63 mm cylinder at Cv 1.65 flow; releasing the pedal lets the spring return the clamp every time.
Sawmill dust-gate diverter
In a woodworking plant heavy sawdust coats everything electrical. Mounted right at the ducting, this valve flips a dust-extraction gate cylinder between two positions, fed by a 40 um-filtered line, and the spring return snaps the gate back to the default route when the limit valve signal drops.
Quarry tip-gate control
On a quarry truck-dump body or vibrating feeder, vibration and shock kill wiring connectors. Here the valve sits on the chassis and a mechanical lever valve pilots it; the 0.15-0.8 MPa operating band copes with the site compressor, and four cycles per second covers fast gate indexing with Dia 63-80 mm rams.
Is the AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008) the Right Valve?
Size around this body by flow: if your cylinder is under about Dia 50 mm and speed is modest, the smaller 4A200 body at Cv 1.0 will do the job for less; if you need to move a Dia 80-125 mm cylinder faster, step up to the 4A400 at Cv 2.82. Within the function choice, pick this single-pilot 10 version when a spring should always return the cylinder, the double-pilot 20 when a pulsed memory position is needed, or a 30C/E/P 5/3 when the cylinder must hold, float or balance at centre.
Because the 4A31008 contains nothing electrical, it can be bolted onto the machine right next to the cylinder and driven by a single air signal line - no coil to burn out, no certification burden in dust or fume zones, and no trouble with wash-down or vibration. One valve is fine on its own; a bank of them mounts on the 300M manifold base (up to 12 stations with a 3/8in common inlet). When replacing, match four points exactly: body size (4A300), function digit (10), port (08 = 1/4in) and thread (blank = PT tapered).
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 300M 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 Hold the pilot signal on; releasing it springs the spool back.
- check Fit silencers or fittings to the exhaust ports.
- check Once run on lubricated air, keep lubricating it.
AirTAC 4A310-08 Pneumatic Valve, 4A300 Series (4A31008) FAQ
It is a 5/2 single-pilot, spring-return valve for double-acting cylinders and actuators of roughly Dia 50-80 mm. Published figures for this body: effective area 28.0 mm2 (Cv 1.65) in the 5/2 configuration, a no-load maximum frequency of 4 cycles per second, operating pressure 0.15-0.8 MPa (21-114 psi) with a 1.2 MPa proof pressure, a 40 um filtration requirement, and a weight of 275 g. AirTAC publishes no flow rate in L/min - size by the Cv and the cylinder displacement instead.
The spool is moved purely by compressed air fed to the pilot port from a separate signal valve - a hand lever, foot pedal, roller limit valve or a small 3/2 valve. The signal must be HELD for the valve to stay switched; release it and the internal spring pushes the spool back, sending the cylinder to its rest position. There is no minimum published pilot pressure and no electrical connection at all: the valve shares the same 0.15-0.8 MPa supply that powers the rest of the circuit.
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