bellows seal

bellows seal

[′bel·ōz ‚sēl]
(mechanical engineering)
A boiler seal in the form of a bellows which prevents leakage of air or gas.
References in periodicals archive ?
The company says a good example of this is its range of valves available in a bellows seal design, such as its Type 808 bellows sealed globe valve.
* A secondary packing system that acts as a backup seal above the primary bellows seal.
These non-vented bellows seal from two sides, aiding in dual sealing and preventing in the accumulation of contaminants inside the leaflet.
The electrically actuated valve is normally closed and features a PTFE bellows seal with no wetted metals or elastomers.
With PTFE bellows seal, pressure ratings to 140 PSI and Cv's to 80, the PS series is designed for water purification and chemical treatment systems.
Designed for steam, hot-water and heat-transfer fluid applications, the BE3L bellows seal glove valve features forged steel construction and stainless steel bellows to with-J, stand 10,000 cycles.
feature bellows seal design that replaces the throat packings and throat seal lubricant in traditional piston pumps.
Unlike a bolted seal, which pushes against the sealing material hardest under the bolts, a bellows seal exerts the same force around the entire circumference.
In addition, the enhanced sealing and thermal absorption of the flexible bellows seal component works well with lasers of various sizes.
The unit's smooth, crevice-free surface eliminates the risk of food or foreign matter being trapped, whilst the bellows seal, used at the valve's stem, produces an hermetic seal that prevents product contamination.