SEALING DEVICE

摘要

Sealing assembly between two concentric moving parts of machinery has a sealing ring made of tough but elastic material and a member made of rubber which applies radial pressure to the ring; the one machine part has a groove to take both the ring and pressure member; the ring rests against the circumference of the second machine part. When unstressed, the ring leaves a gap to (at least part of) the low pressure side of the groove; when under pressure and/or friction between the ring and the circumference concerned however the ring is bent towards the low pressure side and provides a seal against the circumference. The ring is pref. made of PTFE or polyurethane. -