Examples are shown with the seal used in a knife gate valve, a ball valve, and a butterfly valve.

A rotary knife gate valve includes a gate which rotates above a process flow axis within a pipeline.

A knife gate valve comprising a two-piece valve body (12, 14) , a knife gate (16) , an elastomeric transverse seal (54) , an elastomeric perimeter seal (52) , and a pair of elastomer liners.

A knife gate valve is disclosed with a U-shaped peripheral seal 82) held in body (1).

Vessels (10, 11, 12 and 13) are associated with an inlet manifold (14) passing to inlets (16), each controlled by a knifegate valve (17).