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790ZSP dual action breather valve

Product description:

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 (25.4 mm) hole or screwed in a 1 inch (25.4 mm) 20 UNEF-2B hole where the minimum wall thickness is 1/16 inch (1.62 mm) and a maximum of 5/16 inch (7.94 mm).

Features & 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 & technical information


  • 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)

Additional information

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