摘要:
A spiral wound gasket (1) comprises an internal ring (2), an intermediate ring (14), made by the coiling (16) of a continuous non-metallic tape. The internal ring (2) is made of a non-metallic material, for example PTFE.
摘要:
A spiral wound gasket (1) comprises an inner ring (2), an intermediate ring (14), made by the coiling (16) of a continuous non-metallic tape. The inner ring (2) is made of a non-metallic material, for example PTFE.
摘要:
The present invention relates to an on-off valve provided with sealing means for the control stem. The sealing means comprise a plurality of sealing rings of expanded graphite and a gland device for placing said rings in compression. The sealing means further comprise a further active element (20) arranged on the bottom wall (30), provided with an expansion room (22) wherein the fluid pressure causes a thrust action towards said sealing ring. Said sealing means distribute the strain state of the compressed rings in an optimum manner.