Two-way container breather valve with independent pressure and vacuum settings and recessed manual release.
Description
The TA333 automatically relieves pressure and vacuum in sealed containers, with independent settings for each direction. It suits containers up to 33 cubic feet, subject to the selected flow rating and operating conditions.
Manual pressure equalisation
The manual-release button equalises pressure before opening. Its recessed position protects against damage and accidental operation by adjacent containers. A light spring must be overcome before the button opens the valve.
Construction and protection
Corrosion-resistant components, a silicone seal and a PTFE-coated spherical seat help the valve open after prolonged storage. The tamper-resistant assembly requires no field maintenance. Its cover and dust baffle limit sand and dust entry.
When closed, valves with nominal cracking settings of at least 0.5 psi are suitable for IPX6-rated containers. Closed valves rated at least 1.0 psi nominal cracking pressure prevent water entry in the NEMA 250 5.7 hose-down test.
Settings and installation
Standard reseal settings span 0.25–3.0 psid; lower settings generally provide higher flow. Pressure and vacuum flow ratings differ, so selection should account for container volume and pressure limits.
Gasket, washer and hex nut are supplied. The valve meets MIL-DTL-27166 and SAE AS27166.
Further information
| Reseal Pressure | 0.25–3.0 psid (standard settings) |
|---|---|
| Airflow | Pressure: 1.5–3.0 SCFM; vacuum: 2.5–4.0 SCFM, at 1.5 psi above reseal pressure (standard settings) |
| Mounting Hole Diameter | 1.05 ± 0.015 in. (27 ± 0.38 mm) |
| Pressure Flow | 1.5–3.0 SCFM at 1.5 psi above reseal pressure (standard 0.25–3.0 psid settings) |
| Vacuum Flow | 2.5–4.0 SCFM at 1.5 psi above reseal pressure (standard 0.25–3.0 psid settings) |
| Maximum Wall Thickness | 0.61 in. (15.5 mm) |
| Housing Material | Aluminium (housing, hex nut and washer) |
| Seal Material | Silicone rubber |
| Mounting Seal | Silicone per A-A-59588, Class II Grade 60 |
| Finish | Clear Anodised |
| Mounting Hardware | Gasket, washer and hex nut supplied |
| Mounting Thread | 3/4-14 NPSM (threaded-boss installation) |
| Weight | 0.10 lb (45 g) |
| Maintenance | No field maintenance required |
| Ingress Protection | IPX6 enclosure suitability with valve closed and nominal cracking pressure ≥0.5 psi |
| NEMA Ratings | NEMA 250 section 5.7 hose-down test: no water entry with valve closed and nominal cracking pressure ≥1.0 psi |
Drawings available on request.
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