airtight seal Archives - Sierra Cases

Sealing A Transit Case

Sierra Cases — Wed, 23 Apr 2014 17:59:58 +0000

An IP-rated transit case has a water and air-tight seal between lid or cover and body. That seal must be maintained in the face of relative movement caused by rough handling, pressure differentials between interior and exterior, and temperature extremes. That seal is formed by an O-ring. The O-ring Circular in cross-section, an O-ring is […]

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How a Pressure Relief Valve Handles Pressure Differentials

Sierra Cases — Thu, 13 Dec 2012 16:25:11 +0000

The greatest strength of the well-constructed transit case is also its greatest weakness. An airtight seal keeps moisture and dust at bay but can lead to a significant pressure differential. If the case becomes pressurized—say you close it at night and leave it in the desert sun all day—the sides might bulge, and the seal […]

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Pressure Relief Valves: The Smart Way to Handle Pressure Changes

Sierra Cases — Tue, 04 Dec 2012 16:27:31 +0000

You've packed your delicate items in an airtight case to protect them from moisture and dust. Air can't get in or out. That's the purpose. But, what happens when the outside pressure changes? Altitude and Transit Cases Say you close the case in San Diego, then drive it over the mountains to Denver, Colorado. Denver […]

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