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Halkey Roberts

Pressure Relief Products


990 PRV

Product Information

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 (26.7mm) hole or screwed in a 1 inch (25.4mm) 14 UN-2B straight pipe thread hole.

Features and Benefits

  • Higher flow at lower pressure differentials
  • Manual override button for quick relief
  • Corrosion resistant materials
  • Compact and lightweight: approx. 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 and Technical Information

  • Materials:
    • 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)

Information Downloads

Note:  "C" prefix indicates HR drawing available for our customers.  When ordering, actual part number does not include "C" prefix.


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