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Halkey Roberts

Pressure Relief Products


790 PRV

Product Information

The 790 is an automatic dual action valve designed to maximize the reliability of breather valves in critical conditions.

The 790 is primarily used in the container industry, transportation cases and other military, industrial and medical applications.

The 790 may be clamped in a 7/8 inch (22.2mm) hole or screwed in a 7/8 inch (22.2mm) 32 UN-2B threaded hole where the minimum wall thickness is 1/16 inch (1.62mm) and a maximum of 5/16 inch (7.94mm).

Features and Benefits

  • High efficiency, reliability and flow in any position or hostile environment
  • Manual override button for quick relief
  • Corrosion-resistant materials
  • Compact and lightweight: approx. weight 0.75 ounces (21 grams)
  • Individually calibrated and tested
  • Available coatings: 
    • Clear anodized or black anodized standard
    • EMI/RFI coating available 

Specifications and Technical Information

  • Materials:
    • Body, stem and nut: 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 5.0 psig
    • Other pressures 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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