AirTAC 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08)
The AirTAC AirTAC 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08) is a genuine 5/3-way 5/3 double air pilot — pressure centre 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 21.3 mm² effective area (Cv 1.25).
- Valve type5/3-way
- ActuationAir pilot
- Port sizePT1/4
- Effective area21.3 mm²
- Flow (Cv)1.25
- Series4A300
- No minimum order. A single piece can be ordered.
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About the AirTAC 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08)
The AirTAC 4A330P08 is a 5/3-way air pilot valve with a pressure centre: at mid-position both cylinder ports A and B stay connected to supply, so a double-acting cylinder sits with equal pressure on both sides and the piston resists drift from light asymmetric loads. Switching is done entirely by air - a pulse to one pilot port throws the sliding spool and it stays there until a pulse on the opposite port - so there is no coil, no wiring and nothing electrical to seal or certify in a dusty or explosive area.
Flow capacity is the published 5/3 figure for this body: 21.3 mm2 effective area, Cv 1.25, with a no-load maximum of 3 cycles per second, sized for double-acting cylinders around Dia 50-80 mm. The 08 port code gives 1/4in PT (Rc tapered) connections on inlet, outlet and exhaust, which seal on the thread flanks - wrap the male threads with PTFE tape rather than relying on a face washer. The valve runs on air filtered to 40 um at 0.15-0.8 MPa, weighs 505 g in its aluminium-alloy body, and mounts singly or on a 300M manifold base.
AirTAC 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08) Technical Specifications
| Model | AirTAC 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08) |
|---|---|
| Series | 4A300 air pilot valve (sliding-spool type) |
| Valve type | 5/3-way |
| Function | 5/3 double air pilot — Pressure centre |
| Actuation | Double air pilot, spring-centred (exterior air control) |
| Port size | PT1/4 |
| Exhaust port | PT1/4 |
| Thread standard | PT (Rc tapered) |
| Effective area (Cv) | 21.3 mm² (Cv 1.25) |
| 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 | 505 g |
Specifications follow the official AirTAC 4A series datasheet. AirTAC publishes the effective area / Cv published for 4A330C-10; 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 | 21.3 mm² |
|---|---|
| Flow coefficient | Cv 1.25 |
| 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 | 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 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08)
| 4A | Air pilot valve, sliding-spool, 4-series. |
|---|---|
| 3 | Body size (4A300) — sets port & flow. |
| 30P | 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 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08) Is Used
Clamp fixtures on welding press tables
Pressure centre keeps clamp cylinders on a jig or weld fixture fed with supply air on both sides between cycles, so the piston holds square against the workpiece instead of drifting while the operator loads parts. Cv 1.25 covers Dia 50-80 mm clamp cylinders comfortably.
Quarry and aggregate plant actuation
Chute diverters, gate gates and gate cylinders on crushers and screeners run well on this valve because the pilot signal is plain air - no coil to fail in constant vibration and abrasive dust. Air must be filtered to 40 um before it reaches the spool.
Balanced positioner on packaging lines
On pushers or hold-downs where a mid-stroke equalised position is wanted, pulsing either pilot port moves the spool and the pressure centre pressurises both cylinder ports at standstill. The PT tapered 1/4in ports suit standard tapered-thread fittings on existing pipework.
Is the AirTAC 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08) the Right Valve?
Size by flow first: at Cv 1.25 the 4A330P08 sits mid-range - step down to the 4A200 body (Cv 1.0) for smaller cylinders or slower cycles, or step up to the 4A400 (Cv 2.82) when you need more air per stroke. Choose the pressure centre only if your circuit wants the cylinder held under balanced supply pressure at mid-position; pick the 30C closed centre to block all ports and trap the cylinder as-is, or the 30E exhaust centre to let it float free. Remember the 5/3 body cycles at 3 per second maximum, not the 4 of the 5/2 versions.
An air pilot beats a solenoid wherever electrics are the weak point: no coil to burn out, no certification burden in explosive or grain-dust atmospheres, no wash-down or vibration failures, and the valve can sit on the machine driven by one signal line from a remote hand, foot or limit valve. For replacement, match four points exactly: body size (4A300), function (30P), port (08 = 1/4in) and thread (PT tapered). Multiple valves can share one 300M manifold base with a 3/8in common inlet.
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 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 4A330P-08 Pneumatic Valve, 4A300 Series (4A330P08) FAQ
It directs compressed air to double-acting cylinders and actuators - never single-acting ones, which need a 3/2 valve. Published figures for the 5/3 body: effective area 21.3 mm2, Cv 1.25, no-load maximum frequency 3 cycles per second, operating pressure 0.15-0.8 MPa (21-114 psi) with a 1.2 MPa (175 psi) proof pressure. It suits cylinders of roughly Dia 50-80 mm. Air must be filtered to 40 um, and lubrication is not required - though once run on lubricated air it must stay lubricated.
All three 5/3 variants use the same double-pilot memory spool - a pulse on one pilot port shifts it, and it stays put until pulsed the other way. The difference is the middle state: 30P (this valve) connects both cylinder ports to supply so pressure is equal on both sides of the piston; 30C blocks every port so the cylinder is trapped where it stopped; 30E exhausts ports A and B so the cylinder can be moved freely by hand. Note that none of these is a stand-alone safety device - for suspended or fall-hazard loads add a mechanical brake or pilot-operated check valves at the cylinder ports.
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