A metal ring (5), an anti-extrusion ring (6) and an 'O' ring seal (7) are slidably located within the body.
The garter spring is embedded in the seal element adjacent the axial end of the seal element and configured to span the gap between the anti-extrusion ring and the wall of the well in the set state.
To accommodate the additional back-up rings, the O-ring groove width L needs to be increased to L1 for one back-up ring or L2 for two back-up rings (fig. 3).
The back-up ring is an integrated part of the buffer seal.
The back-up ring is an integrated part of the rod seal
When the pressure comes from both sides, a back-up ring is installed on both sides.
The back-up ring is installed at the zero pressure side when the O-ring is exposed to pressure from one side.
Products > O-Rings > Anti extrusion rings > The role of the anti extrusion rings
Products > O-Rings > Anti extrusion rings > Characteristics of the anti extrusion rings
Their function is anti-extrusion, remaining closed during insertion in the fistula and opening if under any pressure to prevent extrusion.
The anti extrusion assembly (504) is operably associated with the support assembly (502).
An individual retention feature can be uniquely designed to secure an anti-extrusion layer.
Typically, the upper or outer edges of the anti-extrusion device are relatively delicate.
The backup ring is assembled so that the initial clearance (extrusion gap) between the backup ring and relatively rotating member is not affected by the differential pressure acting across the assembly.
The compression assembly (500) includes a support assembly (502) and an anti extrusion assembly (504).
Disclosed is an anti-extrusion assembly (12) used in conjunction with an expandable packing device.
Secondarily, a metal sealing/anti-extrusion ring (18) is provided.
However, SKF generally recommends choosing O-rings with 70 shA and combining them with one or two back-up rings (→ Extrusion gaps and back-up rings).
A pair of rigid cap rings (158, 160) is disposed between the backup rings (138, 140).
One of the fixtures (24) is provided with an anti-extrusion valve (25) to prevent the bladder from being forced out through the fixture.
A pair of anti-extrusion rings (44) are placed juxtaposed to each side surface of the radial leg.
A technique enables control over anti-extrusion layer movement during packer inflation.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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