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990 series dual action breather valve

Product description:

The 990 Breather Valve is primarily used in the container industry and for transportation cases and other military, industrial and medical applications.


The 990 is an automatic dual action valve that utilizes the coaxial movement of pressure and vacuum poppets to maximize reliability, efficiency and flow in any position or hostile environment.


The 990 valve may be clamped in a 1.05 inch (26.7 mm) hole or screwed in a 1 inch (25.4 mm) 14 UN-2B straight pipe thread hole.

Features & benefits

  • Higher flow at lower pressure differentials

  • Manual override button for quick relief

  • Corrosion resistant materials

  • Compact and lightweight: approximate weight 1.5 ounces (43 grams)

  • Individually calibrated and tested

  • Self-aligning poppet allows for repeatable cracking and reseating. 

  • Available coatings: Black anodized or clear anodized standard; EMI/RFI coating available 

Specifications & technical information


  • Body, stem, nut, clamp and washer: Anodized aluminum

  • Retaining ring: Stainless steel 

  • Spring: Stainless steel 


Pressure tolerance:

  • Cracking pressure ±15% nominal 

  • Reseat within 20% of nominal


Standard pressure and vacuum settings:

  • 0.1 to 3.0 psig

  • Other settings available on request (minimum orders apply)

Additional information

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