Obturating ring

An obturating ring is a ring of relatively soft material designed to obturate under pressure to form a seal. Obturating rings are often found in artillery and other ballistics applications, and similar devices are also used in other applications such as plumbing, like the olive in a compression fitting. The term "O-ring" is sometimes used to describe this kind of pressure seal.

Ballistics uses

Welin screw breech with mushroom-shaped de Bange obturator, and obturating ring behind

Obturating rings are common in artillery, where the hard steel casing of the shell is too hard to practically deform to provide a tight seal for the propellant gases. An obturating ring or driving band made of a softer material is the typical solution. Mortar bombs also use obturating rings to provide a seal around the projectile. Recoilless rifles and some artillery use rings with a reverse impression of the rifling cut in them for a tighter seal even at very low pressures.

Some artillery shells use an obturating ring at the rear of the shell to provide a tight seal for the breech. This allows a mostly caseless ammunition without the sealing issues generally encountered in such ammunition. The obturating ring provides the sealing that would normally be provided by a cartridge case.

gollark: ...
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gollark: ```osmarks@fenrir ~/Downloads> avinfo shrek.webm [libdav1d @ 0x55f88f9249c0] libdav1d 0.7.1Input #0, matroska,webm, from 'shrek.webm': Metadata: title : 8MiB shrek COMMENT : I'd just like to interject for a moment. What you're referring to as systemd, is in fact, Emacs/systemd, or as I've recently taken to calling it, Emacs plus systemd. COMPOSER : Todd Howard ENCODER : Av1an+opusenc Duration: 01:30:08.51, start: -0.007000, bitrate: 12 kb/s Stream #0:0: Video: av1 (Main), yuv420p10le(tv), 128x72, SAR 1:1 DAR 16:9, 6 fps, 6 tbr, 1k tbn, 1k tbc (default) Metadata: DURATION : 01:30:08.513000000 Stream #0:1: Audio: opus, 48000 Hz, mono, fltp (default) Metadata: DURATION : 01:30:08.461000000[libdav1d @ 0x55f88f963f80] libdav1d 0.7.1```
gollark: I do have a copy of Shrek in poor quality in 8MiB.
gollark: The ceramic wobble thing was very popular in cult season a few months back.

References

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