초록 ▼

A seal, especially for a valve, comprises a substantially rigid support member 10, an abutment envelope 22 made from polytetrafluoroethylene (PTFE) defining a volume between it and the support member, and a resiliently deformable, compressed, rubber sealing member 18 positioned in the volume. The PT

A seal, especially for a valve, comprises a substantially rigid support member 10, an abutment envelope 22 made from polytetrafluoroethylene (PTFE) defining a volume between it and the support member, and a resiliently deformable, compressed, rubber sealing member 18 positioned in the volume. The PTFE envelope 22 is relatively chemically inert and allows the seal to be used in chemically harsh environments, the rubber sealing member 18 provides the necessary resilience and the rigid support member produces positive sealing. In a preferred embodiment, the sealing member 18, the abutment envelope 22 and the support member 10 are annular.

대표청구항 ▼

A seal arrangement comprising: a resiliently deformable sealing member; a separately formed, substantially undeformable support member having a plurality of faces, one of said faces being in abutment with said resiliently deformable member; and a separately formed, protective envelope comprising a f

A seal arrangement comprising: a resiliently deformable sealing member; a separately formed, substantially undeformable support member having a plurality of faces, one of said faces being in abutment with said resiliently deformable member; and a separately formed, protective envelope comprising a fold of flexible material having two opposed flaps joined by, and contiguous with, an arcuate linking portion; said opposed flaps of said envelope being releasably engageable with respective second and third faces of said substantially undeformable support member, thereby defining between said support member and said envelope a void of greater cross-sectional area than said resiliently formable sealing member and in which void said resiliently deformable sealing member, in use, is located, said arcuate portion of said protective envelope abutting said resiliently deformable member which is thereby held in abutment with said first face of said substantially undeformable support member.