Airtac 4A series: air-piloted directional valve - 4A31008

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Photos are for reference only. Not all models have pictures.

Description

Specifications

4A31008 is an AirTAC 4A300 series, 5-port, 2-position air-operated directional valve with two-position single air pilot and 1/4 in PT thread main connections. It uses external pneumatic pilot control.

Model Code Explained

Code	Meaning for this model
4A	5-port directional air valve family
3	300 size series
10	two-position single air pilot
08	Main port nominal size: 1/4 in
(blank thread code)	PT thread

Product Catalog

Download AirTAC Product Catalog (PDF)

For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.

Technical Data

Parameter	Details
Valve function	5 ports / 2 positions
Actuation	two-position single air pilot
Working medium	Air filtered through a 40 µm filter element
Operating pressure	0.15–0.8 MPa
Proof pressure	1.2 MPa
Operating temperature	−20 to 70 °C
Body material	Aluminum alloy
Lubrication	Not required
Maximum actuation frequency	4 cycles/s, no-load condition
Supply and outlet ports	1/4 in PT thread
Exhaust connection nominal size	1/4 in
Pilot connection nominal size	1/8 in
Reference weight	245 g

Weight source difference: the 2022 summary weight table on printed page 300 lists 245 g for this size and actuation. The 2022 family technical page and the linked PDF list 275 g. The Chinese 4A catalog currently linked from the official product page, published in February 2023, also lists 275 g on printed page 127. This listing retains 245 g as the 2022 summary-table reference. The reviewed catalogs do not explain the discrepancy or assign it to an identified production revision. The summary table itself states that weights are for reference and the actual product prevails. Confirm or weigh the supplied unit before weight-sensitive design or shipping calculations.

Operation and Catalog Notes

The single pilot operates the spool between two positions, with spring return shown in the catalog pneumatic symbol.
Sliding-spool construction is designed for sealing and sensitive response. The internal bore uses special processing to reduce friction and starting pressure and support service life.
Oil lubrication is not required. If lubricated air is introduced, lubrication must be continued; the catalog recommends ISO VG32 oil or equivalent.
Maximum actuation frequency is specified under no-load conditions. Effective area and Cv values are calculated from flow-test data.
The series supports manifold integration to save mounting space; select the matching size and catalog mounting arrangement.

Flow Characteristics

Catalog model reference	Published effective area / Cv
4A310-10 / 4A320-10	Effective area 28 mm²; Cv 1.65
4A330C-10	Effective area 21.3 mm²; Cv 1.25

The flow curve is labeled 4A310-10. Its axes show operating pressure from 0 to 0.7 MPa and flow in L/min; values are AirTAC laboratory test data. The printed chart range is 0–3200 L/min, which is an axis range rather than a guaranteed operating flow. The figures above retain the exact model labels printed in the table; no unprinted flow rating is assigned to another port size or center function.

Dimensions and Mounting

Dimensions follow the applicable drawing in the 2022 catalog, printed page 119. Numerical linear dimensions are in millimeters. Lettered references retain the catalog labels; unlabeled callouts are identified by the view and feature. Threaded connections are shown separately. The drawing uses the standard PT version; the selected thread option is stated in the model code table.

Parameter	Details
A (two exhaust ports)	1/4 in
B (three supply/outlet ports)	1/4 in
C	22 mm
D	29 mm
E	0 mm
Overall length	95.5 mm
Body width	40 mm
Body thickness	27 mm
Transverse mounting reference	20 mm
Side mounting offset	6.5 mm
Side hole pitch	24 mm
Side lower hole reference	28 mm
Front hole pitch	50 mm
Front lower hole reference	15 mm
Opposite face port pitch	45 mm
Opposite face lower port reference	17.5 mm
Opposite face center port height	40 mm
Front mounting holes	2 x diameter 4.3 mm
Side mounting holes	2 x diameter 4.3 mm
Pilot connection	1 x 1/8 in (PT in standard drawing)

For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.

Accessories and Ordering Options

The 2022 manifold page 123 explicitly pairs 4A300 valves with 300M manifolds (1–12 stations). The matching blank-plate kit is P-300M-R2. Manifold kits list manifold, seal and screws; blank-plate kits list blank plate and screws. These are separately identified accessory kits; screw and seal quantities are not stated.

M5 models omit the thread suffix. Other sizes are ordered with blank = PT, G = G thread, or T = NPT. Actuation options are 10 single pilot, 20 double pilot, and 30C / 30E / 30P for closed / exhaust / pressure center. These are separate model choices, not adjustable modes of one ordered valve.

Cylinder and Circuit Selection Reference

The 2022 catalog, printed page 299, lists the following theoretical cylinder selection references for 4A31008. These are catalog reference combinations, not a guarantee of cylinder speed in an installed circuit. Tubing is outside diameter x inside diameter. The listed auxiliary choices belong to the reference row; choose connection threads to match the actual valve and circuit. Accessories are separate selections, not an included package.

Parameter	Details
Cylinder bore 63 mm	Theoretical speed (mm/s) → necessary effective area (mm²): 300 → 4.9; 400 → 6.5; 500 → 8.1
Speed-control valve choices	PTL02, PSL02, PSS02, ASC20008, PTL03, PSL03, PSS03, ASC30010
Silencer choices	BSL02, BSLM02, BESL02, PAL02, PALM02, BSL03, BSLM03, BESL03, PAL03, PALM03
Tubing reference	8 x 5 mm at 300–400; 10 x 6.5 mm at 500 mm/s

Parameter	Details
Cylinder bore 63 mm	Theoretical speed (mm/s) → necessary effective area (mm²): 600 → 9.7; 700 → 11.4; 800 → 13
Speed-control valve choices	PTL02, PSL02, PSS02, ASC20008, PTL03, PSL03, PSS03, ASC30010
Silencer choices	BSL02, BSLM02, BESL02, PAL02, PALM02, BSL03, BSLM03, BESL03, PAL03, PALM03
Tubing reference	10 x 6.5 mm at 600–700; 16 x 11 mm at 800 mm/s

Original Product Statement

4A300 is a functional alternative to the SMC SYA3_20 series.

Product form

Specifications 4A31008 is an AirTAC 4A300 series, 5-port, 2-position air-operated directional valve with two-position single air pilot and 1/4 in... Read more

SKU: 4A31008

$32.88 Incl. VAT

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In-stock items: processed and shipped within 1–3 business days. Custom-made items: G/NPT threads and non-standard specifications require 7–15 business days of factory production before shipping.

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Please check the full model number, dimensions, thread type, stroke and voltage where applicable before ordering. If you are unsure, email airtacs@airtacs.com with the model number and required specifications.

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Description

Specifications

Model Code Explained

Code	Meaning for this model
4A	5-port directional air valve family
3	300 size series
10	two-position single air pilot
08	Main port nominal size: 1/4 in
(blank thread code)	PT thread

Product Catalog

Download AirTAC Product Catalog (PDF)

For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.

Technical Data

Parameter	Details
Valve function	5 ports / 2 positions
Actuation	two-position single air pilot
Working medium	Air filtered through a 40 µm filter element
Operating pressure	0.15–0.8 MPa
Proof pressure	1.2 MPa
Operating temperature	−20 to 70 °C
Body material	Aluminum alloy
Lubrication	Not required
Maximum actuation frequency	4 cycles/s, no-load condition
Supply and outlet ports	1/4 in PT thread
Exhaust connection nominal size	1/4 in
Pilot connection nominal size	1/8 in
Reference weight	245 g

Operation and Catalog Notes

The single pilot operates the spool between two positions, with spring return shown in the catalog pneumatic symbol.
Sliding-spool construction is designed for sealing and sensitive response. The internal bore uses special processing to reduce friction and starting pressure and support service life.
Oil lubrication is not required. If lubricated air is introduced, lubrication must be continued; the catalog recommends ISO VG32 oil or equivalent.
Maximum actuation frequency is specified under no-load conditions. Effective area and Cv values are calculated from flow-test data.
The series supports manifold integration to save mounting space; select the matching size and catalog mounting arrangement.

Flow Characteristics

Catalog model reference	Published effective area / Cv
4A310-10 / 4A320-10	Effective area 28 mm²; Cv 1.65
4A330C-10	Effective area 21.3 mm²; Cv 1.25

Dimensions and Mounting

Parameter	Details
A (two exhaust ports)	1/4 in
B (three supply/outlet ports)	1/4 in
C	22 mm
D	29 mm
E	0 mm
Overall length	95.5 mm
Body width	40 mm
Body thickness	27 mm
Transverse mounting reference	20 mm
Side mounting offset	6.5 mm
Side hole pitch	24 mm
Side lower hole reference	28 mm
Front hole pitch	50 mm
Front lower hole reference	15 mm
Opposite face port pitch	45 mm
Opposite face lower port reference	17.5 mm
Opposite face center port height	40 mm
Front mounting holes	2 x diameter 4.3 mm
Side mounting holes	2 x diameter 4.3 mm
Pilot connection	1 x 1/8 in (PT in standard drawing)

For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.

Accessories and Ordering Options

Cylinder and Circuit Selection Reference

Parameter	Details
Cylinder bore 63 mm	Theoretical speed (mm/s) → necessary effective area (mm²): 300 → 4.9; 400 → 6.5; 500 → 8.1
Speed-control valve choices	PTL02, PSL02, PSS02, ASC20008, PTL03, PSL03, PSS03, ASC30010
Silencer choices	BSL02, BSLM02, BESL02, PAL02, PALM02, BSL03, BSLM03, BESL03, PAL03, PALM03
Tubing reference	8 x 5 mm at 300–400; 10 x 6.5 mm at 500 mm/s

Parameter	Details
Cylinder bore 63 mm	Theoretical speed (mm/s) → necessary effective area (mm²): 600 → 9.7; 700 → 11.4; 800 → 13
Speed-control valve choices	PTL02, PSL02, PSS02, ASC20008, PTL03, PSL03, PSS03, ASC30010
Silencer choices	BSL02, BSLM02, BESL02, PAL02, PALM02, BSL03, BSLM03, BESL03, PAL03, PALM03
Tubing reference	10 x 6.5 mm at 600–700; 16 x 11 mm at 800 mm/s

Original Product Statement

4A300 is a functional alternative to the SMC SYA3_20 series.