AirTAC 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08)
The AirTAC AirTAC 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08) is a genuine 5/3-way 5/3 double air pilot — closed 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.
- 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 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08)
The 4A330C08 is a 5/3-way double air pilot valve in the AirTAC 4A300 series, sized with a 1/4 inch PT (Rc tapered) thread on every port. It directs compressed air to double-acting cylinders and pneumatic actuators, and it is thrown by a pulse of air on one pilot port or the other - there is no coil, no wiring and no electrical rating to worry about. At the centre position the closed-centre design blocks all five ports, so a cylinder parked mid-stroke holds its position until the next pilot signal arrives.
Flow capacity is a 21.3 mm2 effective area (Cv 1.25), the published 5/3 figure for this body, with a no-load switching rate of up to 3 cycles per second and an operating range of 0.15-0.8 MPa. At 505 g it is the heaviest 4A300 valve, and it suits cylinders around Dia 50-80 mm. The PT taper seals on the thread flanks, so wrap the male threads with PTFE tape during fitting. Air reaching the valve must be filtered by a 40 um element.
AirTAC 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08) Technical Specifications
| Model | AirTAC 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08) |
|---|---|
| Series | 4A300 air pilot valve (sliding-spool type) |
| Valve type | 5/3-way |
| Function | 5/3 double air pilot — Closed 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 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08)
| 4A | Air pilot valve, sliding-spool, 4-series. |
|---|---|
| 3 | Body size (4A300) — sets port & flow. |
| 30C | 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 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08) Is Used
Quarry crusher dust sealing gates
Gate and clamshell cylinders on stone crushers run in abrasive dust that kills coils and connectors. The sealed all-pneumatic 4A330C08 keeps switching, and closed centre parks the gate where the operator last pulsed it.
Sawmill log clamp positioning
Clamp arms around a saw line must hold position between cuts. With Cv 1.25 feeding Dia 50-80 mm clamp cylinders, the closed centre blocks A, B, P and exhausts at mid-position so the arms stay clamped without a held signal.
Paint booth fixture clamping
Solvent-laden spray booth air makes electrical switching a certification burden. A remote manual or mechanical signal valve throws this pilot valve with a short air pulse, and the fixture cylinder holds at centre with no electronics in the hazard zone.
Is the AirTAC 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08) the Right Valve?
Size by flow first: the 4A300 sits mid-range, so step DOWN to the 4A200 (Cv 1.0) for smaller cylinders or step UP to the 4A400 (Cv 2.82) if your Dia 50-80 mm cylinder is running fast or over longer lines. Within the body, pick this 30C closed centre when the load must stay put at mid-position; choose the 30E exhaust centre if the cylinder should float free, or the 30P pressure centre if both sides should be live. If you would rather have spring return with a single signal, the 4A310 and 4A320 5/2 variants are the same envelope.
An air pilot earns its place wherever a solenoid struggles: no coil to burn out, no certification needed in explosive or dusty air, and it tolerates wash-down and vibration on the machine. For replacements, match all four points: body size 4A300, function 30C, port 08, thread PT. One valve works alone; several can share a 300M manifold base with a 3/8 inch common inlet, up to 12 stations.
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 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08) FAQ
It is a 5/3 closed-centre, double air pilot valve with a published effective area of 21.3 mm2 (Cv 1.25), a no-load maximum of 3 cycles per second and an operating pressure range of 0.15-0.8 MPa (21-114 psi). That places it on double-acting cylinders around Dia 50-80 mm; for higher flow step up to the 4A400 (Cv 2.82), for less use the 4A200 (Cv 1.0).
A short air pulse on either pilot port throws the spool; at the centre position all five ports are blocked, so the cylinder ports are sealed and the load stays where it stopped. For suspending or fall-hazard loads, add a pilot-operated check valve or a mechanical brake at the cylinder - never rely on the valve alone as a safety brake. Supply air must pass a 40 um filter, and the PT tapered threads seal on the flanks with PTFE tape.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC 4A Valves & Bases
Request a Quote for AirTAC 4A330C-08 Pneumatic Valve, 4A300 Series (4A330C08)
Send us the quantity, thread standard and destination. We confirm price, stock and lead time — usually within 7-8 hours.