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Halkey Roberts

Pressure Relief Products



Product Information

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

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

The 790ZSP may be clamped in a 1 inch (25.4mm) hole or screwed in a 1 inch (25.4mm) 20 UNEF-2B 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
  • Compact and lightweight: approx. weight 1.15 ounces (33 grams)
  • Individually calibrated and tested
  • Corrosion-resistant materials
  • Available coatings: 
    • black anodized aluminum standard
    • EMI/RFI coating available

Specifications and Technical Information

  • Materials:
    • Body, stem, nut, and clamp: aluminum
    • Retaining ring:  stainless steel
    • Spring: stainless steel
  • Pressure tolerance:
    • Cracking pressure ±15% nominal 
    • Reseat within 20% of nominal
  • Standard pressure and vacuum settings:
    • 0.25 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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