Llinear&reciprocating-Application failures-gap extrusion

failure mode

gap extrusion

failure cause

gap behind seal too big

excentricity of components

inadequate material performance

remedial measures

improve guiding between seal housing and 

rod

add back-up ring in seal or behind seal

reduce tolerance of fit

change to more extrusion resistant material

Failure mode

gap extrusion

Failure cause

gap behind seal too big

excentricity of piston to bore

inadequate material performance

Remedial measures

improve guiding of piston

change to more extrusion resistant material

add back-up rings

adjust gap size

Failure mode

gap extrusion

Failure cause

insufficient material performance

clearance fit too big

Remedial measures

seal in more extrusion resistant material

add back up ring in seal or behind seal

reduce clearance fit behind seal

Failure mode

gap extrusion

Failure cause

excentricity of piston to bore

insufficient material performance

Remedial measures

improve guiding

seal in more extrusion resistant material

add back-up ring

reduce clearance fit