Obturating ring
{{short description|Ring of soft material designed to obturate under pressure}}
{{Other uses|Obturator (disambiguation){{!}}Obturator}}
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
File:305 mm breech Maneesi 1.JPG with mushroom-shaped de Bange obturator, and obturating ring behind]]
Obturating rings are common in artillery, where the steel or cast-iron casing of the shell is too hard to practically deform to provide a tight seal for the propellant gases. An obturating ring which is called driving band made of a softer material is the standard solution for that problem. Mortar bombs also use obturating rings to provide a seal around the projectile. {{source?|date=May 2023}} 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.{{clarify|date=May 2023}}
Another obturating ring may be used on sliding/falling breech-blocks from the opposite side of the chamber to provide a tight seal there if the charge is bagged and lacks a case (examples include early Krupp guns to Royal Ordnance L11 to M777). The obturating ring provides the sealing that would normally be provided by a cartridge case.
See also
References
- [http://www.inetres.com/gp/military/infantry/mortar/81mm.html 81 mm mortar shell information], showing the obturating ring